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Fabrication of heterostructural Ru-SrTiO3 fibers through in-situ exsolution for visible-light-induced photocatalysis SCIE Scopus
期刊论文 | 2022 , 925 | JOURNAL OF ALLOYS AND COMPOUNDS
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Abstract :

A hybrid metal-semiconductor can be utilized as an attractive photocatalyst which demonstrates unique synergistic properties stemming from the materials combination. One of the essential advancements is precisely controllable for each geometrical factor in metal and its semiconductive support. Herein, we synthesized Sr0.9Ti0.9Ru0.1O3-delta (STRO) fibers by the electrospinning method and tailored the morphology by in-situ exsolved Ru nanoparticles (NPs). Thus, a metal-semiconductor heterostructure is formed. The hierarchical Ru-STRO catalyst manifested a remarkable enhancement of solar-assisted photocatalytic activity with a 5-fold increase in hydrogen evolution rate, attributed to enhanced charge separation, reaction sites, and light absorption. Theoretical simulations and Kelvin probe force microscopy (KPFM) explained the reaction pathways of photogenerated carriers and how their partitioning and transportation are tuned by Ru NPs. Our work provides a novel method to easily fabricate metal-semiconductor heterostructure via an in-situ growth method for the development of high-performance photocatalysts. (C) 2022 Elsevier B.V. All rights reserved.

Keyword :

In-situ exsolution Metal-semiconductor heterostructure Photocatalysis

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GB/T 7714 Li, Qinghao , Zhou, Jun , Fu, Lei et al. Fabrication of heterostructural Ru-SrTiO3 fibers through in-situ exsolution for visible-light-induced photocatalysis [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 925 .
MLA Li, Qinghao et al. "Fabrication of heterostructural Ru-SrTiO3 fibers through in-situ exsolution for visible-light-induced photocatalysis" . | JOURNAL OF ALLOYS AND COMPOUNDS 925 (2022) .
APA Li, Qinghao , Zhou, Jun , Fu, Lei , Chen, Chengxiang , Mao, Siman , Pu, Zengxin et al. Fabrication of heterostructural Ru-SrTiO3 fibers through in-situ exsolution for visible-light-induced photocatalysis . | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 925 .
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Local charge transport at different interfaces in epoxy composites SCIE Scopus
期刊论文 | 2022 , 33 (34) | NANOTECHNOLOGY
SCOPUS Cited Count: 2
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Abstract :

Charge transport in insulating composites is fundamental to designing high performance in electrical breakdown strength processes. A fundamental understanding of the charge transport at nanoscale in insulating composites remains elusive. Herein, we fabricate two types of interfaces in epoxy (EP) composites (Al2O3/EP and bubble/EP, respectively). Then the local dynamic charge mobility behavior and charge density are explored using in situ Kelvin probe force microscopy. After the external voltage in the horizontal direction is applied, significant differences are demonstrated in the evolution of charge transport for epoxy matrix, filler/bubble, and their interface, respectively. The interface between Al2O3 and epoxy is easier to accumulate the negative charges and introduce shallow traps. Lots of positive charges are located around a bubble where deeper traps are present and could prevent charge migration. Thus, this work offers extended experimental support to understanding the mechanism of charge transport in dielectric composites.

Keyword :

charge transport interface nanocomposites nanoscale trap

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GB/T 7714 Jia, Beibei , Zhou, Jun , Chen, Yuqing et al. Local charge transport at different interfaces in epoxy composites [J]. | NANOTECHNOLOGY , 2022 , 33 (34) .
MLA Jia, Beibei et al. "Local charge transport at different interfaces in epoxy composites" . | NANOTECHNOLOGY 33 . 34 (2022) .
APA Jia, Beibei , Zhou, Jun , Chen, Yuqing , Lv, Zepeng , Guo, Haomin , Zhang, Zixuan et al. Local charge transport at different interfaces in epoxy composites . | NANOTECHNOLOGY , 2022 , 33 (34) .
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Effect of BTA on Interface Charge Barrier and Charge Transportation in Oil-Paper Insulation EI SCIE Scopus
期刊论文 | 2022 , 29 (2) , 412-419 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
SCOPUS Cited Count: 7
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Abstract :

It is known that 1,2,3 benzotriazole (BTA) can effectively limit the oil flow electrification in oil-paper insulation used in HVAC transformers, but it is still unclear whether BTA is applicable to converter transformers. Thus, the effects of BTA on interface charge behaviors and charge migration in oil-paper system under dc stress are investigated in this article. The experimental results show that BTA reduces the interface barrier between oil and oil-immersed paper by altering the charge distribution of the electric double layer (EDL) at the oil-paper interface, which is beneficial to the operation stability of converter transformers in the condition of polarity inversion. However, it is also found that the BTA additive promotes the charge accumulation at oil-paper interface and enhances the local electric field by increasing the carrier mobility of oil-paper insulation. The experimental results in this article provide references for the selection of insulating oil additives for converter transformers.

Keyword :

Anodes BTA Cathodes Charge measurement charge transport electric double layer (EDL) interface barrier interface charge Oil insulation oil-paper insulation Oils Power transformer insulation Voltage

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GB/T 7714 Gao, Lu , Wu, Yang , Lv, Zepeng et al. Effect of BTA on Interface Charge Barrier and Charge Transportation in Oil-Paper Insulation [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2022 , 29 (2) : 412-419 .
MLA Gao, Lu et al. "Effect of BTA on Interface Charge Barrier and Charge Transportation in Oil-Paper Insulation" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 29 . 2 (2022) : 412-419 .
APA Gao, Lu , Wu, Yang , Lv, Zepeng , Wu, Kai . Effect of BTA on Interface Charge Barrier and Charge Transportation in Oil-Paper Insulation . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2022 , 29 (2) , 412-419 .
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Effects of Oil Flow on Space Charge Behaviors in Oil-Paper Composite Insulation EI SCIE Scopus
期刊论文 | 2022 , 29 (5) , 1777-1784 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
SCOPUS Cited Count: 2
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Abstract :

Although the circulating flow of insulating oil can enhance heat dissipation in converter transformers, it can also influence the space charge distribution in oil-paper composite insulation. In this article, the oil-paper composite insulation between flat electrodes was used as the experimental model. Based on the pulsed electroacoustic (PEA) method, we investigated the effect of uncharged flowing oil on the space charge distribution in composite insulation under a dc electric field and polarity reversal. Under a dc electric field, as the oil flow velocity increased, the amount of interface charge between the oil and paper first increased and then decreased. During the polarity reversal process, the field distortion was aggravated at slower oil flows. These experimental results were explained in terms of the effect of oil flow on ionized charges in the oil.

Keyword :

Charge measurement Electric field distortion Electric fields flowing oil interface charge Oil insulation Oils polarity reversal Power transformer insulation Space charge velocity Voltage

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GB/T 7714 Zhang, Chunyang , Wu, Kai , Lv, Zepeng et al. Effects of Oil Flow on Space Charge Behaviors in Oil-Paper Composite Insulation [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2022 , 29 (5) : 1777-1784 .
MLA Zhang, Chunyang et al. "Effects of Oil Flow on Space Charge Behaviors in Oil-Paper Composite Insulation" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 29 . 5 (2022) : 1777-1784 .
APA Zhang, Chunyang , Wu, Kai , Lv, Zepeng , Wang, Xia , He, Yifei , Wu, Yang et al. Effects of Oil Flow on Space Charge Behaviors in Oil-Paper Composite Insulation . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2022 , 29 (5) , 1777-1784 .
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In-situ growth of Ru/RuO2 nanoparticles decorated (La0.6Sr1.4)(0.95)Mn0.9Ru0.1O4 as a potential electrode for symmetrical solid oxide fuel cells EI SCIE Scopus
期刊论文 | 2022 , 189 , 1419-1427 | RENEWABLE ENERGY
SCOPUS Cited Count: 7
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Abstract :

The A-site deficient (La0.6Sr1.4)0.95Mn0.9Ru0.1O4 (LSMRuO4) K2NiF4-type oxide is developed as a potential electrode for symmetrical solid oxide fuel cells (SSOFCs) with Ru/RuO2 nanoparticles decorating, which exhibits enhanced electrochemical activity for both hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR). The Ru nanoparticles are introduced via in-situ exsolution and distribute uniformly on the surface of LSMRuO4 as fuel electrode. And the metallic Ru nanoparticles were converted into RuO2 nanoparticles after exposing furtherly to the conditions encountered at oxygen electrode. Decorated by Ru nanoparticles, the highest electrical conductivity of 10.07 S cm-1 and lowest polarization resistance of 0.28 0 cm2 are obtained for LSMRuO4 in 5% H2/N2 at 750 degrees C. Additionally, modified by RuO2 nanoparticles, LSMRuO4 also exhibits the highest electrical conductivity of 55.23 S cm-1 and lowest polarization resistance of 0.12 0 cm2 at 750 degrees C in air. With Ru nanoparticles at fuel electrode and RuO2 nanoparticles at oxygen electrode simultaneously, the LSMRuO4-SSZ|SSZ|LSMRuO4-SSZ (Sc2O3 stabilized ZrO2) single cell demonstrates the highest power output of 711 mW cm-2 at 750 degrees C using pure H2 as fuel. All these results indicate that Ru/RuO2 nanoparticles decorated LSMRuO4 can be a favorable electrode for SSOFCs.

Keyword :

Electrochemical performance In-situ growth K 2 NiF 4-Type oxides Ru RuO 2 nanoparticles SSOFCs

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GB/T 7714 Wang, Junkai , Yang, Jiaming , Fu, Lei et al. In-situ growth of Ru/RuO2 nanoparticles decorated (La0.6Sr1.4)(0.95)Mn0.9Ru0.1O4 as a potential electrode for symmetrical solid oxide fuel cells [J]. | RENEWABLE ENERGY , 2022 , 189 : 1419-1427 .
MLA Wang, Junkai et al. "In-situ growth of Ru/RuO2 nanoparticles decorated (La0.6Sr1.4)(0.95)Mn0.9Ru0.1O4 as a potential electrode for symmetrical solid oxide fuel cells" . | RENEWABLE ENERGY 189 (2022) : 1419-1427 .
APA Wang, Junkai , Yang, Jiaming , Fu, Lei , Zong, Zheng , Zhou, Jun , Wu, Kai . In-situ growth of Ru/RuO2 nanoparticles decorated (La0.6Sr1.4)(0.95)Mn0.9Ru0.1O4 as a potential electrode for symmetrical solid oxide fuel cells . | RENEWABLE ENERGY , 2022 , 189 , 1419-1427 .
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Facile fabrication of exsolved nanoparticle-decorated hollow ferrite fibers as active electrocatalyst for oxygen evolution reaction EI SCIE
期刊论文 | 2021 , 418 | CHEMICAL ENGINEERING JOURNAL
WoS CC Cited Count: 6
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Abstract :

Hierarchical metal-oxide support catalysts for oxygen evolution reaction (OER) have attracted significant attention in the development of highly efficient and low-cost energy technology. However, the interaction between nanoparticles and perovskite supports is still unclear. Herein, we report a unique and simple strategy for enhancing OER activity based on ferrite (La0.9Fe0.92Ru0.08O3-delta, LFRO) nanofibrous architecture by in-situ growth of Ru/RuO2 nanoparticles. Hollow fibrous LFRO is synthesized by a modified electrospinning method. Ru and RuO2 nanoparticles anchor on the surface of LFRO substrate via a simple exsolution strategy. Benefiting from the synergic effect of the interaction of metal-metal oxides and large active surface area of hollow fibers, the nanofibrous LFRO electrode decorated by RuO2 nanoparticles delivers high electrocatalytic OER activity and durability. Meanwhile, KPFM measurement demonstrates that a low work function induced by plenty of oxygen vacancies could accelerate the charge transfer process and thus facilitate the OER kinetics. Our work provides insight into rational designing efficient hierarchical nanostructured electrocatalysts via a simplified in-situ growth method.

Keyword :

Hierarchical Nanostructure In-situ Growth Nanofibrous Ferrite Oxygen Evolution Reaction Work function

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GB/T 7714 Fu, Lei , Zhou, Jun , Zhou, Likai et al. Facile fabrication of exsolved nanoparticle-decorated hollow ferrite fibers as active electrocatalyst for oxygen evolution reaction [J]. | CHEMICAL ENGINEERING JOURNAL , 2021 , 418 .
MLA Fu, Lei et al. "Facile fabrication of exsolved nanoparticle-decorated hollow ferrite fibers as active electrocatalyst for oxygen evolution reaction" . | CHEMICAL ENGINEERING JOURNAL 418 (2021) .
APA Fu, Lei , Zhou, Jun , Zhou, Likai , Yang, Jiaming , Liu, Zhengrong , Wu, Ke et al. Facile fabrication of exsolved nanoparticle-decorated hollow ferrite fibers as active electrocatalyst for oxygen evolution reaction . | CHEMICAL ENGINEERING JOURNAL , 2021 , 418 .
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The Simultaneous Evolution of Space Charge and Conduction Current in LDPE EI SCIE
期刊论文 | 2021 , 28 (2) , 623-631 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
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Abstract :

The development of a system to measure simultaneously the current and space charge in a dielectric is described. The results obtained for low density polyethylene samples show that the relationship between space charge accumulation and the time-dependent current is not straightforward. In accord with previous work on space charge limited currents, the transient currents initially decreased, but after a while an increment or peak appeared. Additionally, the generation and extraction of space charge packets caused an impulse-like current peak such as previously observed. By comparing the electric field and current at the anode, it was found that the increment and the peak of the anode current are determined by injected negative carriers reaching the anode rather than the increase of electric field at the anode. It is shown that the dynamical evolution of the current can be divided into three stages similar to transient space charge limited current theory.

Keyword :

charge extraction charge injection conduction current space charge transient space charge limited current theory

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GB/T 7714 Lv, Zepeng , Ma, Yuntong , Zhang, Chen et al. The Simultaneous Evolution of Space Charge and Conduction Current in LDPE [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2021 , 28 (2) : 623-631 .
MLA Lv, Zepeng et al. "The Simultaneous Evolution of Space Charge and Conduction Current in LDPE" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 28 . 2 (2021) : 623-631 .
APA Lv, Zepeng , Ma, Yuntong , Zhang, Chen , Peng, Jinyang , Wu, Kai , Dissado, L. A. . The Simultaneous Evolution of Space Charge and Conduction Current in LDPE . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2021 , 28 (2) , 623-631 .
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Cerium and ruthenium co-doped La(0.7)Sr(0.3)FeO3-delta as a high-efficiency electrode for symmetrical solid oxide fuel cell EI SCIE CSCD
期刊论文 | 2021 , 39 (9) , 1095-1099 | JOURNAL OF RARE EARTHS
WoS CC Cited Count: 6
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Abstract :

Symmetrical solid oxide fuel cells (SSOFCs) could be alternative energy conversion devices due to their simple fabrication process and low cost. Herein, perovskite La0.6Ce0.1Sr0.3Fe0.95Ru0.05O3-d (LCSFR) was synthesized and evaluated as a high-performance electrode for SSOFCs based on the electrolyte of La0.9Sr0.1Ga0.8Mg0.2O3-d (LSGM). LCSFR retains their stable perovskite crystal structure in both reducing and oxidizing atmospheres, though a minor amount of LaSrFeO4 phase is present under reducing conditions. Morphology investigation shows that homogeneously dispersed Ru metallic nanoparticles are exsolved on the surface of LCSFR after being reduced. The polarization resistance (Rp) of LCSFR-CGO (Ce0.9Gd0.1O2-d) is about 0.11 U,cm2 at 800 degrees C in air, while the value of Rp for LCSFR-CGO in wet H2 (3% H2O) increases up to 0.32 U,cm2. The symmetrical LCSFR-CGO|LSGM|LCSFR-CGO cell demonstrates a performance with an open circuit potential (OCV) of 1.07 V and a maximum peak power density of 904 mW/cm2 at 800 degrees C using wet H2 as the fuel. This high performance indicates that LCSFR is a candidate electrode for SSOFCs. (C) 2021 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.

Keyword :

Exsolution Nanoparticle catalysts Rare earths SSOFCs Symmetrical electrode

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GB/T 7714 Wang, Junkai , Fu, Lei , Yang, Jiaming et al. Cerium and ruthenium co-doped La(0.7)Sr(0.3)FeO3-delta as a high-efficiency electrode for symmetrical solid oxide fuel cell [J]. | JOURNAL OF RARE EARTHS , 2021 , 39 (9) : 1095-1099 .
MLA Wang, Junkai et al. "Cerium and ruthenium co-doped La(0.7)Sr(0.3)FeO3-delta as a high-efficiency electrode for symmetrical solid oxide fuel cell" . | JOURNAL OF RARE EARTHS 39 . 9 (2021) : 1095-1099 .
APA Wang, Junkai , Fu, Lei , Yang, Jiaming , Wu, Ke , Zhou, Jun , Wu, Kai . Cerium and ruthenium co-doped La(0.7)Sr(0.3)FeO3-delta as a high-efficiency electrode for symmetrical solid oxide fuel cell . | JOURNAL OF RARE EARTHS , 2021 , 39 (9) , 1095-1099 .
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Theoretical insights on the exsolved behavior of ruthenium atom in titanate perovskite EI SCIE
期刊论文 | 2021 , 566 | APPLIED SURFACE SCIENCE
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Understanding the formation of active nanoparticles at the surface of perovskite oxide supports is vital to improving the electrochemical properties of catalysts. Surface-modified titanates via exsolution have shown great potential applications in energy conversion and storage devices. However, the details of exsolution are unclear, especially at the atomic level. In this work, we use the framework of density-functional theory (DFT) to investigate the exsolved mechanism of Ru atoms on novel SrTiO3-based perovskite, Sr0.975Y0.125Ti0.95Ru0.05O3-delta (SYTR). It is found that the segregation energy of Ru from bulk to surface turns from positive to negative by partially substituting A-site strontium with yttrium. The formation of oxygen vacancy accelerates the dynamic process of exsolution. Ru nanoparticles nucleate preferentially around the vicinity of yttrium sites based on the analysis of the transition states of Ru adatoms. A lower activation energy migration path of Ru could be obtained due to the introduction of A-site deficiency and surface oxygen vacancies simultaneously. The results demonstrate in this work provide significant insights to understand the mechanism of exsolution behavior in titanate perovskites.

Keyword :

COHP DFT Migration Nucleation Segregation

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GB/T 7714 Lian, Zhongjie , Yang, Jiaming , Wang, Junkai et al. Theoretical insights on the exsolved behavior of ruthenium atom in titanate perovskite [J]. | APPLIED SURFACE SCIENCE , 2021 , 566 .
MLA Lian, Zhongjie et al. "Theoretical insights on the exsolved behavior of ruthenium atom in titanate perovskite" . | APPLIED SURFACE SCIENCE 566 (2021) .
APA Lian, Zhongjie , Yang, Jiaming , Wang, Junkai , Fu, Lei , Wang, Chu , Xiao, Bing et al. Theoretical insights on the exsolved behavior of ruthenium atom in titanate perovskite . | APPLIED SURFACE SCIENCE , 2021 , 566 .
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Effect of moisture content on the accuracy and economic feasibility of oil–paper insulation prediction model EI SCIE
期刊论文 | 2020 , 14 (9) , 696-703 | IET Science, Measurement and Technology | IF: 1.914
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Abstract :

The condition assessment of oil–paper insulation is a vital issue in transformer management. To investigate the effect of moisture content on the accuracy of the prediction model, accelerated ageing experiments were performed with different initial moisture content (IMC) in laboratory condition. Two types of multi-parameter lifetime prediction models, e.g. with and without consideration of IMC, were presented for comparison purpose. The authors found that a better accuracy for its prediction results could be achieved by establishing the prediction models with the consideration of IMC. Besides, models considering IMC have better economic feasibility than that without considering IMC(non-IMC) as its total cost is cheaper according to life cycle cost (LCC) calculations. In addition, failure probability based on the proposed prediction models was also calculated as a direct indicator for evaluating the oil–paper insulation status. © The Institution of Engineering and Technology 2020

Keyword :

Costs Forecasting Insulation Life cycle Moisture Moisture determination Oil filled transformers Paper Predictive analytics

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GB/T 7714 Li, Chong , Wu, Kai , Cheng, Chuanhui . Effect of moisture content on the accuracy and economic feasibility of oil–paper insulation prediction model [J]. | IET Science, Measurement and Technology , 2020 , 14 (9) : 696-703 .
MLA Li, Chong et al. "Effect of moisture content on the accuracy and economic feasibility of oil–paper insulation prediction model" . | IET Science, Measurement and Technology 14 . 9 (2020) : 696-703 .
APA Li, Chong , Wu, Kai , Cheng, Chuanhui . Effect of moisture content on the accuracy and economic feasibility of oil–paper insulation prediction model . | IET Science, Measurement and Technology , 2020 , 14 (9) , 696-703 .
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