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< Page ,Total 128 >
Sulfur transformation mechanism during supercritical water gasification of black liquor EI SCIE Scopus
期刊论文 | 2023 , 338 | FUEL
SCOPUS Cited Count: 4
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Abstract :

Supercritical water gasification (SCWG) was a promising technology to treat black liquor harmlessly and recycle energy efficiently, while the sulfur transformation of black liquor during SCWG process remained unknow. Herein, the effects of different parameters on gasification and sulfur transformation was determined in a batch reactor. The results showed that reaction temperature played the most important role. H-2 was the most important gaseous product with the maximum yields of 19.01 mol center dot kg(-1), simultaneously achieving the highest carbon gasification efficiency (95.16 %), COD removal rate (99.98 %) and the pH of 8.5 at 700 degrees C, 30 min and 25 MPa. After SCWG treatment, most of sulfur existed in the form of sulfide (H2S/S2-), and the maximum proportion of which was up to 90.51 % at 700 degrees C, 30 min and 25 MPa. With the increase in temperature, the organic sulfur (thiol/thioether, sulfone and thiophene) and inorganic sulfur (sulfate and thiosulfate) were transformed into sulfide (H2S/S2-). Finally, the sulfur transformation mechanisms of black liquor in SCWG were proposed. This work provided a basis for resource utilization of black liquor and a promising method for sodium sulfide production.

Keyword :

Black liquor Hydrogen production Sulfur transformation Supercritical water gasification

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GB/T 7714 Lu, Libo , Wei, Wenwen , Liu, Fan et al. Sulfur transformation mechanism during supercritical water gasification of black liquor [J]. | FUEL , 2023 , 338 .
MLA Lu, Libo et al. "Sulfur transformation mechanism during supercritical water gasification of black liquor" . | FUEL 338 (2023) .
APA Lu, Libo , Wei, Wenwen , Liu, Fan , Ge, Zhiwei , Jin, Hui , Chen, Yunan et al. Sulfur transformation mechanism during supercritical water gasification of black liquor . | FUEL , 2023 , 338 .
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Experimental investigation on organic functional groups evolution in hydrogen production process by coal gasification in supercritical water EI SCIE Scopus
期刊论文 | 2023 , 48 (15) , 5887-5900 | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
SCOPUS Cited Count: 7
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Abstract :

Supercritical water gasification (SCWG) of coal has great application prospect for converting coal into hydrogen-rich gas efficiently and cleanly. However, the previous study on the reaction mechanism for SCWG of coal is relatively macroscopic rather than reflects the reaction essence deeply. The evolution of organic functional groups in Zhundong lignite (ZD), Hongliulin bitumite (HLL) and Ningxia anthracite (NX) during SCWG, as well as the correlation with gaseous products were analyzed quantitatively in this paper. It was found that the lower rank coal contained more free radicals and produced more H2 with SCW. H2 yield of the three types of coal exceeded 2 times the hydrogen content in coal at 800 degrees C. The organic functional groups evolve in 2-4 stages during SCWG process. The decomposition and gasification of organic functional groups mainly took place in low or medium temperature range. About 95% of C=O groups and 90% of aromatic C=C groups cracked and were gasified. Aromatic ether (Car-O) groups were formed in high temperature range. The reasonable functional relationship between the parameters of gaseous products and organic functional groups was established, providing a new approach to predict organic functional groups through gaseous products. This research may lay the foundation for further optimization design of reactor.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

Coal rank Correlation Gasification Organic functional groups Supercritical water

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GB/T 7714 Sun, Jingli , Luo, Kui , Feng, Huifang et al. Experimental investigation on organic functional groups evolution in hydrogen production process by coal gasification in supercritical water [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2023 , 48 (15) : 5887-5900 .
MLA Sun, Jingli et al. "Experimental investigation on organic functional groups evolution in hydrogen production process by coal gasification in supercritical water" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 48 . 15 (2023) : 5887-5900 .
APA Sun, Jingli , Luo, Kui , Feng, Huifang , Fan, Chao , Jin, Hui , Guo, Liejin . Experimental investigation on organic functional groups evolution in hydrogen production process by coal gasification in supercritical water . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2023 , 48 (15) , 5887-5900 .
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Kinetic study of asphaltenes phase separation in supercritical water upgrading of heavy oil EI SCIE Scopus
期刊论文 | 2023 , 241 | FUEL PROCESSING TECHNOLOGY
SCOPUS Cited Count: 11
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Abstract :

Supercritical water upgrading heavy oil is a promising way to produce light oil and gas. To understand the reactions pathways and the role of supercritical water during the upgrading process, experiments were carried out in a batch reactor at 380-440 degrees C and reaction times up to 2900 min. The products were classified as gas, coke and liquid products which were further separated into saturates, aromatics, resins and asphaltenes. A kinetic model including aromatics and resins partially dissolved in both supercritical water phase and oil phase was developed. This model could fit experimental data well and interpret effects of supercritical water solubility for aromatics and resins on heavy oil upgrading process. Further, supercritical water upgrading process was divided into three stages: pre-induction primary cracking stage, post-induction primary cracking stage and gas -generation stage. This work provides an in-depth understanding of mechanism of heavy oil upgrading in su-percritical water.

Keyword :

Heavy oil upgrading Kinetic model Phase separation Supercritical water

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GB/T 7714 Dong, Yu , Zhao, Qiuyang , Zhou, Yantao et al. Kinetic study of asphaltenes phase separation in supercritical water upgrading of heavy oil [J]. | FUEL PROCESSING TECHNOLOGY , 2023 , 241 .
MLA Dong, Yu et al. "Kinetic study of asphaltenes phase separation in supercritical water upgrading of heavy oil" . | FUEL PROCESSING TECHNOLOGY 241 (2023) .
APA Dong, Yu , Zhao, Qiuyang , Zhou, Yantao , Zheng, Lichen , Jin, Hui , Bawaa, Baercheng et al. Kinetic study of asphaltenes phase separation in supercritical water upgrading of heavy oil . | FUEL PROCESSING TECHNOLOGY , 2023 , 241 .
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Experimental study on alkali catalytic gasification of oily sludge in supercritical water with a continuous reactor SCIE Scopus
期刊论文 | 2023 , 327 | JOURNAL OF ENVIRONMENTAL MANAGEMENT
SCOPUS Cited Count: 7
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Abstract :

Realizing the harmless resource utilization of oily sludge is urgent for petroleum industry and of great signifi-cance for environmental management. The treatment of oily sludge was investigated using supercritical water gasification (SCWG) with a continuous fluidized bed reactor. The effect of operating parameters on gasification efficiency and gas yield without catalyst was tested, and then the influences of catalyst type (K2CO3 and Na2CO3) and concentrations (1-8 wt%) were systematically studied. The results indicated that a medium mass flow ratio and low feedstock concentration were beneficial for gas production. Alkali catalyst improved carbon gasification efficiency (CE) prominently, and Na2CO3 showed better performance due to its better stability. A maximum CE of 95.87% was achieved when 5 wt% Na2CO3 was added at 650 degrees C, 23 MPa with 5 wt% oily sludge concentration. Besides, according to XRD patterns of solid residues, Na2CO3 was more stable than K2CO3 during SCWG. SEM-EDX results also revealed that more K was migrated into solid residues than Na. The analysis of pore structure demonstrated that alkali catalyst promoted the evolution of pore structure, resulting in higher specific surface areas and total pore volumes. Na2CO3 has a more substantial destructive effect on solid matrix, causing the matrix structure to collapse and inhibiting pore structure development. The FTIR spectra of solid products exhibited a lower content of carbohydrates and aromatic structures than the initial oily sludge. NH4-N results demonstrated that SCWG was a potential green treatment process for oily sludge. This work can not only give an insight into the reaction mechanism of alkali catalytic gasification of oily sludge, but also help to guide the optimal design of reactor and the regulation of operating parameters.

Keyword :

Alkali catalyst Fluidized bed reactor Oily sludge Supercritical water gasification

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GB/T 7714 Li, Linhu , Wang, Gaoyun , Li, Xujun et al. Experimental study on alkali catalytic gasification of oily sludge in supercritical water with a continuous reactor [J]. | JOURNAL OF ENVIRONMENTAL MANAGEMENT , 2023 , 327 .
MLA Li, Linhu et al. "Experimental study on alkali catalytic gasification of oily sludge in supercritical water with a continuous reactor" . | JOURNAL OF ENVIRONMENTAL MANAGEMENT 327 (2023) .
APA Li, Linhu , Wang, Gaoyun , Li, Xujun , Wang, Le , Zhang, Jiawei , Cheng, Ke et al. Experimental study on alkali catalytic gasification of oily sludge in supercritical water with a continuous reactor . | JOURNAL OF ENVIRONMENTAL MANAGEMENT , 2023 , 327 .
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Distribution Characteristics of Multiphysics around the Bubble on the Surface of Photoelectrode SCIE Scopus
期刊论文 | 2022 , 169 (12) | JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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In the heterogeneous photocatalytic reaction systems, the evolution of bubbles on the catalyst surface is a complex process that depends on multiple factors, such as the solid-liquid interface structure, solution properties of the reaction system, and multiphysics interactions, and directly affects energy and mass transport processes. This study investigated the multiphysics distribution around a bubble and the bubble detachment characteristics on the surface of a TiO2 photoelectrode during photoelectrocatalytic water splitting. The bubble diameter had an effect on the distribution of the light field in the system, affecting the temperature and flow distributions of the electrolyte around the bubble. Marangoni convection was induced by the inhomogeneous temperature distribution along the bubble interface, which enhanced the heat and mass transfer near the reaction site. It was also demonstrated that an increase in laser power increased Marangoni convection on the bubble surface, thus delaying bubble detachment. A force model for predicting the bubble detachment diameter that considered the coupling effect between the light, temperature, and flow fields was developed. The predicted bubble detachment diameters agreed well with the experimental results within an error of +/- 10%.

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GB/T 7714 Cao, Zhenshan , Feng, Yuyang , Zhang, Bo et al. Distribution Characteristics of Multiphysics around the Bubble on the Surface of Photoelectrode [J]. | JOURNAL OF THE ELECTROCHEMICAL SOCIETY , 2022 , 169 (12) .
MLA Cao, Zhenshan et al. "Distribution Characteristics of Multiphysics around the Bubble on the Surface of Photoelectrode" . | JOURNAL OF THE ELECTROCHEMICAL SOCIETY 169 . 12 (2022) .
APA Cao, Zhenshan , Feng, Yuyang , Zhang, Bo , Xu, Qiang , Wang, Yechun , Guo, Liejin . Distribution Characteristics of Multiphysics around the Bubble on the Surface of Photoelectrode . | JOURNAL OF THE ELECTROCHEMICAL SOCIETY , 2022 , 169 (12) .
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Distribution, risk assessment and stabilization of heavy metals in supercritical water gasification of oily sludge EI SCIE Scopus
期刊论文 | 2022 , 168 , 591-600 | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
SCOPUS Cited Count: 3
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Abstract :

Supercritical water gasification (SCWG) of oily sludge is a potential handling method for resource utilization and pollution reduction. Heavy metals (HMs) in oily sludge were assessed due to their threat to human health and environmental safety. This work investigated the distribution of four HMs (Cu, Zn, Ni and Cr) under different reaction conditions (550-700 degrees C, 1-60 min). The concentrations of HMs in liquid residues (LRs) decreased continuously at higher temperatures and longer residence times except for Ni. Besides, the concentrations of HMs in solid residues (SRs) increased after SCWG except for Zn, and they varied slightly under different conditions. Then, HMs in LRs and SRs were evaluated in terms of Nemerow index, geo-accumulation index and potential ecological risk. The results indicated that the pollution risks of HMs in LRs were minimum at 650 degrees C and 30 min, while that in SRs changed little. When Na2CO3 was added, pollution risks changed slightly, but nearly complete stabilizations of Cu, Zn and Cr (96.2%, 84.2% and 98.6%) were achieved at 600 degrees C. Adding Na2CO3 promoted the formation of aluminosilicate to combine with HMs and enhanced their stabilization notably. This work may demonstrate a promising clean way for oily sludge utilization and HMs stabilizing.

Keyword :

Heavy metals Oily sludge Stabilization Supercritical water gasification

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GB/T 7714 Li, Linhu , Cao, Wen , Peng, Pai et al. Distribution, risk assessment and stabilization of heavy metals in supercritical water gasification of oily sludge [J]. | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION , 2022 , 168 : 591-600 .
MLA Li, Linhu et al. "Distribution, risk assessment and stabilization of heavy metals in supercritical water gasification of oily sludge" . | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION 168 (2022) : 591-600 .
APA Li, Linhu , Cao, Wen , Peng, Pai , Wang, Gaoyun , Liu, Shi , Jin, Hui et al. Distribution, risk assessment and stabilization of heavy metals in supercritical water gasification of oily sludge . | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION , 2022 , 168 , 591-600 .
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Photochemical Systems for Solar-to-Fuel Production SCIE Scopus
期刊论文 | 2022 , 5 (3) | ELECTROCHEMICAL ENERGY REVIEWS
SCOPUS Cited Count: 15
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Abstract :

The photochemical system, which utilizes only solar energy and H2O/CO2 to produce hydrogen/carbon-based fuels, is considered a promising approach to reduce CO2 emissions and achieve the goal of carbon neutrality. To date, numerous photochemical systems have been developed to obtain a viable solar-to-fuel production system with sufficient energy efficiency. However, more effort is still needed to meet the requirements of industrial implementation. In this review, we systematically discuss a typical photochemical system for solar-to-fuel production, from classical theories and fundamental mechanisms to raw material selection, reaction condition optimization, and unit device/system advancement, from the viewpoint of ordered energy conversion. State-of-the-art photochemical systems, including photocatalytic, photovoltaic-electrochemical, photoelectrochemical, solar thermochemical, and other emerging systems, are summarized. We highlight the existing bottlenecks and discuss the developing trend of this technology. Finally, optimization strategies and new opportunities are proposed to enhance photochemical systems with higher energy efficiency.

Keyword :

Carbon-based fuels Hydrogen Photochemical Solar energy

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GB/T 7714 Liu, Ya , Wang, Feng , Jiao, Zihao et al. Photochemical Systems for Solar-to-Fuel Production [J]. | ELECTROCHEMICAL ENERGY REVIEWS , 2022 , 5 (3) .
MLA Liu, Ya et al. "Photochemical Systems for Solar-to-Fuel Production" . | ELECTROCHEMICAL ENERGY REVIEWS 5 . 3 (2022) .
APA Liu, Ya , Wang, Feng , Jiao, Zihao , Bai, Shengjie , Qiu, Haoran , Guo, Liejin . Photochemical Systems for Solar-to-Fuel Production . | ELECTROCHEMICAL ENERGY REVIEWS , 2022 , 5 (3) .
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Sub- and supercritical water conversion of organic-rich shale with low-maturity for oil and gas generation: using Chang 7 shale as an example EI SCIE Scopus
期刊论文 | 2022 , 7 (1) , 155-163 | SUSTAINABLE ENERGY & FUELS
SCOPUS Cited Count: 1
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Abstract :

Organic-rich shale resources are large reserves with high hydrocarbon generation potential but are difficult to exploit due to their high solid kerogen content. Supercritical water conversion was proposed as an alternative method to convert kerogen into oil and gas because supercritical water has favorable solubility, dispersion, and reactivity. In this study, Chang 7 shale containing a high TOC content of 15.11%, type II kerogen, and low Ro of 0.36-0.38% in the Ordos basin was taken as a typical example of organic-rich shale with low maturity. A series of experiments at the temperatures of 300-650 degrees C and a pressure of 25 Mpa were carried out to test the feasibility, and the shale conversion performance was analyzed from three perspectives, hydrocarbon generation of kerogen, the effect of inorganic minerals, and shale pore evolution. The optimum oil and gas yields were, respectively, found to be 352.1 mg (g TOC)(-1) (g TOC refers to total organic carbon mass in shale) at 380 degrees C and 852.0 mL (g TOC)(-1) at 650 degrees C. Compared with pyrolysis in the aluminium retort, supercritical water conversion raised the oil yield at the same temperature (171.4 mg (g TOC)(-1) at 380 degrees C) or reduced the temperature with the same yield (346.8 mg (g TOC)(-1) at 520 degrees C). Chang 7 shale minerals as a whole increased the oil yield by 34.2% at 380 degrees C but had a negligible effect on gas generation. Among them, the carbonate (dolomite) promoted oil generation but inhibited gas generation, while the silicates (feldspar, quartz, and clay) did the opposite, and the pyrite favored both oil and gas generation. Additionally, the supercritical water conversion significantly increased the shale pore volume and specific surface area because the hydrocarbon generation of kerogen produced many nanopores with slit-like shapes and diameters of 50-5000 nm. This paper provides an in-depth understanding of sub- and supercritical water conversion of low-maturity shale for oil and gas production.

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GB/T 7714 Zhao, Qiuyang , Dong, Yu , Zheng, Lichen et al. Sub- and supercritical water conversion of organic-rich shale with low-maturity for oil and gas generation: using Chang 7 shale as an example [J]. | SUSTAINABLE ENERGY & FUELS , 2022 , 7 (1) : 155-163 .
MLA Zhao, Qiuyang et al. "Sub- and supercritical water conversion of organic-rich shale with low-maturity for oil and gas generation: using Chang 7 shale as an example" . | SUSTAINABLE ENERGY & FUELS 7 . 1 (2022) : 155-163 .
APA Zhao, Qiuyang , Dong, Yu , Zheng, Lichen , Xie, Tian , Bawaa, Baercheng , Jin, Hui et al. Sub- and supercritical water conversion of organic-rich shale with low-maturity for oil and gas generation: using Chang 7 shale as an example . | SUSTAINABLE ENERGY & FUELS , 2022 , 7 (1) , 155-163 .
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An Experimental Investigation of the Effect of Platinum on the Corrosion of Cathode Carbon Support in a PEMFC EI SCIE Scopus
期刊论文 | 2022 , 15 (10) | CHEMSUSCHEM
SCOPUS Cited Count: 5
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Abstract :

The possible role of platinum in the carbon corrosion at cell voltage higher than 1.0 V is controversial yet. To gain more insights into this issue, a square-wave potential cycles between 1.0 to 1.5 V was applied to fuel cells comprising cathodes with and without Pt. Using online non-dispersive infrared spectroscopy, we showed that Pt catalyzed the gasification of carbon in the early stage, while upon prolonged exposure to potential cycling (>= 3 h), platinum started to hinder the CO2 production. Based on cyclic voltammetry tests and Raman spectroscopy, the inhibiting effect of platinum on the corrosion was suggested to originate from modifications on carbon surface, where the formation of electroactive sites was limited. Electrode and non-electrode ohmic resistances were distinguished further through electrochemical impedance spectroscopy measurement and the changes in electrode microstructure and surface composition were examined by scanning electron microscope image and energy dispersion X-Ray spectroscopy. The results indicated that Pt reduced the damage of electrode structures after potential cycles.

Keyword :

accelerated stress test carbon corrosion cyclic voltammetry electrocatalysis proton exchange membrane fuel cell

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GB/T 7714 Liu, Fengfeng , Gao, Ziliang , Su, Jinzhan et al. An Experimental Investigation of the Effect of Platinum on the Corrosion of Cathode Carbon Support in a PEMFC [J]. | CHEMSUSCHEM , 2022 , 15 (10) .
MLA Liu, Fengfeng et al. "An Experimental Investigation of the Effect of Platinum on the Corrosion of Cathode Carbon Support in a PEMFC" . | CHEMSUSCHEM 15 . 10 (2022) .
APA Liu, Fengfeng , Gao, Ziliang , Su, Jinzhan , Guo, Liejin . An Experimental Investigation of the Effect of Platinum on the Corrosion of Cathode Carbon Support in a PEMFC . | CHEMSUSCHEM , 2022 , 15 (10) .
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Experimental investigation of reverse voltage phenomenon during galvanostatic start-up of a proton exchange membrane fuel cell EI SCIE Scopus
期刊论文 | 2022 , 258 | ENERGY CONVERSION AND MANAGEMENT
SCOPUS Cited Count: 4
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The reverse voltage is critical for the performance and durability of a proton exchange membrane fuel cell (PEMFC). The reverse process will cause a complex kinetic transformation from normal to abnormal, leading to degradation of catalyst. There are few experimental studies and some numerical simulations reported on this issue, however, the process of reverse voltage under dehydration conditions is still unclear. This article explores the voltage reversal process and dehydration phenomenon of a PEM fuel cell during the start-up process. The effects of operating parameters on the occurrence of the reverse voltage are examined, including the startup current density, the inlet gas relative humidity (RH) and the gas stoichiometric ratio. To understand the reverse process, the voltage, high frequency resistance (HFR) and the outlet gas relative humidity during startup are monitored online in real time. Results show that the reverse voltage occurs when the fuel cell starts up at the condition of low relative humidity, high current density load and high hydrogen stoichiometry at low humidity. From the beginning of the startup process, the humidity of the anode outlet gas decreased significantly, which is correlated with the increase of HFR and the drop of voltage. By time constant analyzing of the process, it was observed that the dehydration on the anode side of the membrane electrode during the startup period led to an instantaneous increase of HFR, which reveals the process mechanism of voltage reversal. Finally, we suggest a startup strategy to reduce or even avoid the reverse voltage.

Keyword :

Galvanostatic startup Membrane dehydration PEM fuel cell Reverse voltage Water management

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GB/T 7714 Gao, Ziliang , Liu, Fengfeng , Su, Jinzhan et al. Experimental investigation of reverse voltage phenomenon during galvanostatic start-up of a proton exchange membrane fuel cell [J]. | ENERGY CONVERSION AND MANAGEMENT , 2022 , 258 .
MLA Gao, Ziliang et al. "Experimental investigation of reverse voltage phenomenon during galvanostatic start-up of a proton exchange membrane fuel cell" . | ENERGY CONVERSION AND MANAGEMENT 258 (2022) .
APA Gao, Ziliang , Liu, Fengfeng , Su, Jinzhan , Guo, Liejin , Liu, Hongtan . Experimental investigation of reverse voltage phenomenon during galvanostatic start-up of a proton exchange membrane fuel cell . | ENERGY CONVERSION AND MANAGEMENT , 2022 , 258 .
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