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Reversible Structural Evolution of NiCoOxHy during the Oxygen Evolution Reaction and Identification of the Catalytically Active Phase EI SCIE Scopus
期刊论文 | 2018 , 8 (2) , 1238-1247 | ACS CATALYSIS
WoS CC Cited Count: 10 SCOPUS Cited Count: 11
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Abstract :

Operando Raman spectroscopy and electrochemical techniques were used during the oxygen evolution reaction to identify the composition and local structure of electrodeposited CoOxHy and NiCoOxHy catalyst films. Before evaluation, the electrodeposited samples were subjected to a variety of thermal and electrochemical conditioning procedures, which generated unique initial catalyst structures and crystallinities. During oxygen evolution, Ni-modified CoOxHy films having lower initial crystallinity underwent substantial structural evolution that began with an irreversible transformation of a spinel local structure to an amorphous CoO structure at low anodic potentials (0.2 V vs Ag/AgCl). Increasing anodic polarization to greater than 0.3 V vs Ag/AgCl facilitated additional structural conversion from the amorphous CoO structure to a complex phase best described as an amalgamation of NiOOH and layered CoO2 motifs (NiOOH-h-CoO2) under elevated oxygen evolution rates. The formation of this NiOOH-h-CoO2 active structure was correlated with improved OER activity, which at 0.35 V overpotential is 100% greater than that of the catalyst where Ni was coordinated in a spinel structure. Independent of the initial cobalt oxide structure, the same NiOOH-h-CoO2 structure was formed during oxygen evolution, which suggests the active phase identified herein could be the universally active structure for NiCoOxHy materials.

Keyword :

spinel structure oxygen evolution reaction Ni incorporation amorphous cobalt oxide reversible structural evolution cobalt oxyhydroxide layered delafossite operando Raman spectroscopy

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GB/T 7714 Chen, Zhu , Cai, Li , Yang, Xiaofang et al. Reversible Structural Evolution of NiCoOxHy during the Oxygen Evolution Reaction and Identification of the Catalytically Active Phase [J]. | ACS CATALYSIS , 2018 , 8 (2) : 1238-1247 .
MLA Chen, Zhu et al. "Reversible Structural Evolution of NiCoOxHy during the Oxygen Evolution Reaction and Identification of the Catalytically Active Phase" . | ACS CATALYSIS 8 . 2 (2018) : 1238-1247 .
APA Chen, Zhu , Cai, Li , Yang, Xiaofang , Kronawitter, Coleman , Guo, Liejin , Shen, Shaohua et al. Reversible Structural Evolution of NiCoOxHy during the Oxygen Evolution Reaction and Identification of the Catalytically Active Phase . | ACS CATALYSIS , 2018 , 8 (2) , 1238-1247 .
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Visible light-induced electronic structure modulation of Nb- and Ta-doped alpha-Fe2O3 nanorods for effective photoelectrochemical water splitting EI SCIE Scopus
期刊论文 | 2018 , 29 (6) | NANOTECHNOLOGY
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

The photoelectrochemical (PEC) water splitting activity of Nb and Ta-doped hematite (alpha-Fe2O3) nanorods was investigated with reference to electronic structures by in situ synchrotron x-ray absorption spectroscopy (XAS). Current density-potential measurements demonstrate that the PEC activity of alpha-Fe2O3 nanorods depends strongly on the species and concentrations of dopants. The doping of alpha-Fe2O3 nanorods with a low level of Nb or Ta can improve their electrical conductivity and thereby facilitate charge transport and reduced electron-hole recombination therein. The photoconversion effects of Nb and Ta-doped alpha-Fe2O3 by in situ XAS in the dark and under illumination revealed opposite evolutions of the spectral intensities of the Fe L-edge and Nb/Ta L-edge, indicating that charge transfer and a conduction pathway are involved in the photoconversion. Analytic in situ XAS results reveal that the alpha-Fe2O3 that is doped with a low level of Nb has a greater photoconversion efficiency than that doped with Ta because Nb sites are more active than Ta sites in alpha-Fe2O3. The correlation between PEC activity and the electronic structure of Nb/Ta-doped alpha-Fe2O3 is examined in detail using in situ XAS and helps to elucidate the mechanism of PEC water splitting in terms of the electronic structure.

Keyword :

x-ray absorption spectroscopy alpha-Fe2O3 photoelectrochemical water splitting electronic structure

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GB/T 7714 Chang, Han-Wei , Fu, Yanming , Lee, Wan-Yi et al. Visible light-induced electronic structure modulation of Nb- and Ta-doped alpha-Fe2O3 nanorods for effective photoelectrochemical water splitting [J]. | NANOTECHNOLOGY , 2018 , 29 (6) .
MLA Chang, Han-Wei et al. "Visible light-induced electronic structure modulation of Nb- and Ta-doped alpha-Fe2O3 nanorods for effective photoelectrochemical water splitting" . | NANOTECHNOLOGY 29 . 6 (2018) .
APA Chang, Han-Wei , Fu, Yanming , Lee, Wan-Yi , Lu, Ying-Rui , Huang, Yu-Cheng , Chen, Jeng-Lung et al. Visible light-induced electronic structure modulation of Nb- and Ta-doped alpha-Fe2O3 nanorods for effective photoelectrochemical water splitting . | NANOTECHNOLOGY , 2018 , 29 (6) .
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Surface- and interface-engineered heterostructures for solar hydrogen generation EI SCIE Scopus
期刊论文 | 2018 , 51 (16) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
SCOPUS Cited Count: 1
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Abstract :

Photoelectrochemical (PEC) water splitting based on semiconductor photoelectrodes provides a promising platform for reducing environmental pollution and solving the energy crisis by developing clean, sustainable and environmentally friendly hydrogen energy. In this context, metal oxides with their advantages including low cost, good chemical stability and environmental friendliness, have attracted extensive attention among the investigated candidates. However, the large bandgap, poor charge transfer ability and high charge recombination rate limit the PEC performance of metal oxides as photoelectrodes. To solve this limitation, many approaches toward enhanced PEC water splitting performance, which focus on surface and interface engineering, have been presented. In this topical review, we concentrate on the heterostructure design of some typical metal oxides with narrow bandgaps (e.g. Fe2O3, WO3, BiVO4 and Cu2O) as photoelectrodes. An overview of the surface- and interface-engineered heterostructures, including semiconductor heterojunctions, surface protection, surface passivation and cocatalyst decoration, will be given to introduce the recent advances in metal oxide heterostructures for PEC water splitting. This article aims to provide fundamental references and principles for designing metal oxide heterostructures with high activity and stability as photoelectrodes for PEC solar hydrogen generation.

Keyword :

surface and interface engineering solar hydrogen metal oxides photoelectrochemical water splitting heterostructures

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GB/T 7714 Chen, Xiangyan , Li, Yanrui , Shen, Shaohua . Surface- and interface-engineered heterostructures for solar hydrogen generation [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (16) .
MLA Chen, Xiangyan et al. "Surface- and interface-engineered heterostructures for solar hydrogen generation" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 51 . 16 (2018) .
APA Chen, Xiangyan , Li, Yanrui , Shen, Shaohua . Surface- and interface-engineered heterostructures for solar hydrogen generation . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (16) .
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Engineering the coordination geometry of metal-organic complex electrocatalysts for highly enhanced oxygen evolution reaction EI SCIE Scopus
期刊论文 | 2018 , 6 (3) , 805-810 | JOURNAL OF MATERIALS CHEMISTRY A
WoS CC Cited Count: 7
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Abstract :

Designing highly efficient oxygen evolution reaction (OER) electrocatalysts is very important for various electrochemical devices. In this work, for the first time, we have successfully generated coordinatively unsaturated metal sites (CUMSs) in phytic acid-Co2+ (Phy-Co2+) based metal-organic complexes by engineering the coordination geometry with room-temperature plasma technology. The CUMSs can serve as active centers to catalyze the OER. The electron spin resonance and X-ray absorption spectra provide direct evidence that the coordination geometry is obviously modified with many CUMSs by the plasma treatment. The plasma treated Phy-Co2+ (P-Phy-Co2+) only requires an overpotential of 306 mV to reach 10 mA cm(-2) on glassy carbon electrodes. When we expand this strategy to a CoFe bimetallic system, it only needs an overpotential of 265 mV to achieve 10 mA cm(-2) with a small Tafel slope of 36.51 mV dec(-1). P-Phy-Co2+ is superior to the state-of-the-art. Our findings not only provide alternative excellent OER electrocatalysts, but also introduce a promising principle to design advanced electrocatalysts by creating more CUMSs.

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GB/T 7714 Yan, Dafeng , Dong, Chung-Li , Huang, Yu-Cheng et al. Engineering the coordination geometry of metal-organic complex electrocatalysts for highly enhanced oxygen evolution reaction [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2018 , 6 (3) : 805-810 .
MLA Yan, Dafeng et al. "Engineering the coordination geometry of metal-organic complex electrocatalysts for highly enhanced oxygen evolution reaction" . | JOURNAL OF MATERIALS CHEMISTRY A 6 . 3 (2018) : 805-810 .
APA Yan, Dafeng , Dong, Chung-Li , Huang, Yu-Cheng , Zou, Yuqin , Xie, Chao , Wang, Yanyong et al. Engineering the coordination geometry of metal-organic complex electrocatalysts for highly enhanced oxygen evolution reaction . | JOURNAL OF MATERIALS CHEMISTRY A , 2018 , 6 (3) , 805-810 .
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A simple green approach to synthesis of sub-100 nm carbon spheres as template for TiO2 hollow nanospheres with enhanced photocatalytic activities EI SCIE Scopus CSCD
期刊论文 | 2018 , 61 (6) , 869-877 | SCIENCE CHINA-MATERIALS
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Abstract :

Carbon spheres (CSs) have attracted great attention given their wide applications in bio-diagnostics, photonic band-gap crystals and drug delivery, etc. The morphology and size of CSs greatly affect their performances and applications. Herein, we report a green and catalyst-free hydrothermal carbonization (HTC) method to synthesize CSs with glucose as carbon precursor. The diameter of CSs can be tuned within a wide range from 450 to 40 nm by controlling the glucose concentration, reaction time and temperature. Using the obtained CSs as template, hollow TiO2 nanospheres (HTNSs) with controllable diameters are prepared via a sol-gel method. As photocatalysts for hydrogen generation, the photoactivity of the HTNSs shows strong dependence upon size, and is much higher than that of solid TiO2. With particle size decreasing, the photoactivity of the obtained HTNSs gradually increases. Without any co-catalyst, the highest photocatalytic hydrogen generation activity is obtained with HTNSs of 40 nm in diameter, which exceeds that of solid TiO2 and commercial P25 by 64 times and 3 times, respectively.

Keyword :

carbon nanospheres photocatalytic hydrogen production hydrothermal carbonization hollow titanium dioxide nanospheres

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GB/T 7714 Tan, Yubo , Liu, Maochang , Wei, Daixing et al. A simple green approach to synthesis of sub-100 nm carbon spheres as template for TiO2 hollow nanospheres with enhanced photocatalytic activities [J]. | SCIENCE CHINA-MATERIALS , 2018 , 61 (6) : 869-877 .
MLA Tan, Yubo et al. "A simple green approach to synthesis of sub-100 nm carbon spheres as template for TiO2 hollow nanospheres with enhanced photocatalytic activities" . | SCIENCE CHINA-MATERIALS 61 . 6 (2018) : 869-877 .
APA Tan, Yubo , Liu, Maochang , Wei, Daixing , Tang, Heming , Feng, Xinjian , Shen, Shaohua . A simple green approach to synthesis of sub-100 nm carbon spheres as template for TiO2 hollow nanospheres with enhanced photocatalytic activities . | SCIENCE CHINA-MATERIALS , 2018 , 61 (6) , 869-877 .
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Trace Amount of Platinum Supported on Carbonized Biomorphic Wood for Efficient Electrochemical Hydrogen Evolution in Alkaline Condition SCIE Scopus
期刊论文 | 2018 , 3 (7) , 2140-2143 | CHEMISTRYSELECT
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Abstract :

Carbonized biomorphic wood (Bio-C), which features unique properties such as highly ordered microtexture, well-developed porous structure, and low charge transfer resistance, was prepared as a promising scaffold with trace amount of platinum (Pt) supported to efficiently electrocatalyze hydrogen evolution reaction (HER). Pt/Bio-C nanocomposites demonstrated superior HER activity with a current density reaching as high as similar to 58 mA cm(-2) at -0.2 V vs. reversible hydrogen electrode (RHE) in strongly alkaline condition.

Keyword :

carbonized biomorphic wood platinum hydrogen evolution reaction electrocatalysis

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GB/T 7714 Wang, Meng , Goenuellue, Yakup , Pyeon, Myeongwhun et al. Trace Amount of Platinum Supported on Carbonized Biomorphic Wood for Efficient Electrochemical Hydrogen Evolution in Alkaline Condition [J]. | CHEMISTRYSELECT , 2018 , 3 (7) : 2140-2143 .
MLA Wang, Meng et al. "Trace Amount of Platinum Supported on Carbonized Biomorphic Wood for Efficient Electrochemical Hydrogen Evolution in Alkaline Condition" . | CHEMISTRYSELECT 3 . 7 (2018) : 2140-2143 .
APA Wang, Meng , Goenuellue, Yakup , Pyeon, Myeongwhun , Diao, Zhidan , Czympiel, Lisa , Singh, Mrityunjay et al. Trace Amount of Platinum Supported on Carbonized Biomorphic Wood for Efficient Electrochemical Hydrogen Evolution in Alkaline Condition . | CHEMISTRYSELECT , 2018 , 3 (7) , 2140-2143 .
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Steering plasmonic hot electrons to realize enhanced full-spectrum photocatalytic hydrogen evolution EI SCIE Scopus CSCD PKU
期刊论文 | 2018 , 39 (3) , 453-462 | CHINESE JOURNAL OF CATALYSIS
WoS CC Cited Count: 1
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Abstract :

Integration of surface plasmons into photocatalysis is an intriguing approach to extend the light absorption range over the full solar spectrum. However, the low migration rates and uncertain diffusion directions of plasmonic hot electrons make their photocatalytic efficiency fail to meet expectations. It remains a challenging task to steer the migration of hot electrons and take full advantage of the plasmonic effect to achieve the desired high photocatalytic efficiency. Herein, we have developed an efficient strategy to steer the migration of plasmonic hot electrons through a well-designed hybrid structure that synergizes a "surface heterojunction" with a Schottky junction. The hybrid structure was synthesized by modifying titanium dioxide (TiO2) nanosheets (NSs) with gold (Au) nanoparticles (NPs) as a plasmonic metal and platinum (Pt) NPs as a co-catalyst. The "surface heterojunction" formed between two different crystal facets in the TiO2 NSs can induce the injection of plasmonic hot electrons from Au NPs excited by visible light to TiO2. Meanwhile, the Schottky junction formed between the Pt NPs and TiO2 NSs can force the migration of electrons from TiO2 to Pt NPs instead of flowing to Au NPs, attaining the efficient unidirectional transfer of carriers in the Au-TiO2 system. Plasmonic photocatalysts with this design achieved dramatically enhanced activity in full-spectrum photocatalytic hydrogen production. This work opens a new window to rationally design hybrid structures for full -spectrum photocatalysis. (C) 2018, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

Keyword :

Plasmonics Surface heterojunction Full spectrum Schottky junction Photocatalytic hydrogen production

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GB/T 7714 Li, Yanrui , Guo, Yu , Long, Ran et al. Steering plasmonic hot electrons to realize enhanced full-spectrum photocatalytic hydrogen evolution [J]. | CHINESE JOURNAL OF CATALYSIS , 2018 , 39 (3) : 453-462 .
MLA Li, Yanrui et al. "Steering plasmonic hot electrons to realize enhanced full-spectrum photocatalytic hydrogen evolution" . | CHINESE JOURNAL OF CATALYSIS 39 . 3 (2018) : 453-462 .
APA Li, Yanrui , Guo, Yu , Long, Ran , Liu, Dong , Zhao, Daming , Tan, Yubo et al. Steering plasmonic hot electrons to realize enhanced full-spectrum photocatalytic hydrogen evolution . | CHINESE JOURNAL OF CATALYSIS , 2018 , 39 (3) , 453-462 .
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Photocatalytic water oxidation over BiVO4 with interface energetics engineered by Co and Ni-metallated dicyanamides EI SCIE Scopus CSCD PKU
期刊论文 | 2018 , 39 (3) , 502-509 | CHINESE JOURNAL OF CATALYSIS
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

Photocatalytic water oxidation based on semiconductors usually suffers from poor charge transfer from the bulk to the interface, which is necessary for oxygen generation. Here, we construct a hybrid artificial photosynthesis system for photocatalytic water oxidation. The system consists of BiVO4 as the light harvester, a transitional metal complex (M(dca)(2), M = Co, Ni, dca: dicyanamide) as the water oxidation catalyst, and S2O82- as a sacrificial electron acceptor. The system exhibits enhanced oxygen evolution activity when M(dca)(2) is introduced. The BiVO4/Co(dca)(2) and BiVO4/Ni(dca)(2) systems exhibit excellent oxygen evolution rates of 508.1 and 297.7 mol/(h center dot g) compared to the pure BiVO4 which shows a photocatalytic oxygen evolution rate of 252.2 mu mol/(h center dot g) during 6 h of photocatalytic reaction. Co(dca)(2) is found to be more effective than Ni(dca)(2) as a water oxidation catalyst. The enhanced photocatalytic performance is ascribed to the M(dca)(2)-engineered BiVO4/electrolyte interface energetics, and to the M(dca)(2)-catalyzed surface water oxidation. These two factors lead to a decrease in the energy barrier for hole transfer from the bulk to the surface of BiVO4, which promotes the water oxidation kinetics. (C) 2018, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

Keyword :

Photocatalysis Interfacial kinetics BiVO4 Metal complex Water oxidation

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GB/T 7714 Shang, Yi , Niu, Fujun , Shen, Shaohua . Photocatalytic water oxidation over BiVO4 with interface energetics engineered by Co and Ni-metallated dicyanamides [J]. | CHINESE JOURNAL OF CATALYSIS , 2018 , 39 (3) : 502-509 .
MLA Shang, Yi et al. "Photocatalytic water oxidation over BiVO4 with interface energetics engineered by Co and Ni-metallated dicyanamides" . | CHINESE JOURNAL OF CATALYSIS 39 . 3 (2018) : 502-509 .
APA Shang, Yi , Niu, Fujun , Shen, Shaohua . Photocatalytic water oxidation over BiVO4 with interface energetics engineered by Co and Ni-metallated dicyanamides . | CHINESE JOURNAL OF CATALYSIS , 2018 , 39 (3) , 502-509 .
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Phase-Modulated Band Alignment in CdS Nanorod/SnSx Nanosheet Hierarchical Heterojunctions toward Efficient Water Splitting EI SCIE Scopus
期刊论文 | 2018 , 28 (16) | ADVANCED FUNCTIONAL MATERIALS
WoS CC Cited Count: 6 SCOPUS Cited Count: 10
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Abstract :

CdS is a promising visible light response photoanode of photoelectrochemical (PEC) water splitting, but it remains a great challenge for practical application, due to the photohole-induced self-corrosion, and sulfide/sulfite ions as hole scavengers are always necessary for stable solar hydrogen generation. Herein, a CdS/SnSx nanorods/nanosheets hierarchical heterostructure with novel phase-engineered band alignment is rationally designed via a two-step solution reaction route for PEC water splitting. In the Na2SO4 aqueous electrolyte without any hole scavengers, compared with the pristine CdS, the CdS/SnSx photoanode achieves a remarkably enhanced photocurrent density of 1.59 mA cm(-2) and a considerable stability at bias potential 1.23 V versus reversible hydrogen electrode (RHE) under simulated sunlight. It is proposed that the deposited SnSx nanosheets not only act as protective layers to restrain the photocorrosion of CdS, but also facilitate the charge separation in CdS by the virtue of the Type II heterojunction formed between CdS and SnSx.

Keyword :

band alignment engineering heterojunctions photoelectrochemical water splitting tin sulfides cadmium sulfides

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GB/T 7714 Fu, Yanming , Cao, Fengren , Wu, Fangli et al. Phase-Modulated Band Alignment in CdS Nanorod/SnSx Nanosheet Hierarchical Heterojunctions toward Efficient Water Splitting [J]. | ADVANCED FUNCTIONAL MATERIALS , 2018 , 28 (16) .
MLA Fu, Yanming et al. "Phase-Modulated Band Alignment in CdS Nanorod/SnSx Nanosheet Hierarchical Heterojunctions toward Efficient Water Splitting" . | ADVANCED FUNCTIONAL MATERIALS 28 . 16 (2018) .
APA Fu, Yanming , Cao, Fengren , Wu, Fangli , Diao, Zhidan , Chen, Jie , Shen, Shaohua et al. Phase-Modulated Band Alignment in CdS Nanorod/SnSx Nanosheet Hierarchical Heterojunctions toward Efficient Water Splitting . | ADVANCED FUNCTIONAL MATERIALS , 2018 , 28 (16) .
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Triggering superior sodium ion adsorption on (200) facet of mesoporous WO3 nanosheet arrays for enhanced supercapacitance EI SCIE Scopus
期刊论文 | 2018 , 345 , 165-173 | CHEMICAL ENGINEERING JOURNAL
WoS CC Cited Count: 3
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Abstract :

Tungsten trioxide (WO3) is believed to be a promising electrode candidate for supercapacitors, due to its reversible surface redox reaction resulted from the almost same W-O bond lengths with different oxidation states. However, the specific capacitance of WO3 electrode is very low (< 250 mF cm(-2)) because of its low conductivity and slow surface redox reaction kinetics. Herein, to address these issues, mesoporous WO3 nanosheets with exposed (200) facets were anchored on activated carbon cloth (ACC) via a simple two-step process including heat treatment and alcohol-thermal process. The ACC was coated on WO3 seeds and proceed a heat treatment at 500 degrees C and the time of alcohol-thermal process were 7 h, 8 h, and 9 h labeled as WO3@ACC-n (n = 7, 8, 9). SEM and TEM images confirmed the WO3 nanosheets were successful anchored on the ACC. The WO3@ACC-8 electrode showed the best specific areal capacitance which could reach as high as 659 mF cm(-2) at a current density of 5 mA cm(-2) and superior stability with almost no decrease in 10,000 cycles in the presence of Na2SO4 as the neutral electrolyte. The capacitance is encouragingly much higher than the previously reported values in a three-electrode system in the neutral aqueous condition. DFT calculations reveal that, in comparison to the (002) and (020) facets, the exposed (200) facets of the mesoporous WO3 nanosheets triggers the superior Na+-adsorption, which accelerates the Na+-involved surface redox reaction for the boosted supercapacitor performance. A flexible asymmetric supercapacitor (FASC) was fabricated from the WO3@ACC electrode, which exhibits high energy density (0.5 mWh cm(-3)) and power density (62 mW cm(-3)) without any attenuation during +/- 180 degrees wide-angle bending.

Keyword :

Exposed facet Sodium ion adsorption Flexible asymmetric supercapacitor Mesoporous WO3 nanosheets

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GB/T 7714 Yin, Zhuocheng , Bu, Yuyu , Ren, Jun et al. Triggering superior sodium ion adsorption on (200) facet of mesoporous WO3 nanosheet arrays for enhanced supercapacitance [J]. | CHEMICAL ENGINEERING JOURNAL , 2018 , 345 : 165-173 .
MLA Yin, Zhuocheng et al. "Triggering superior sodium ion adsorption on (200) facet of mesoporous WO3 nanosheet arrays for enhanced supercapacitance" . | CHEMICAL ENGINEERING JOURNAL 345 (2018) : 165-173 .
APA Yin, Zhuocheng , Bu, Yuyu , Ren, Jun , Chen, Shuai , Zhao, Daming , Zou, Yihui et al. Triggering superior sodium ion adsorption on (200) facet of mesoporous WO3 nanosheet arrays for enhanced supercapacitance . | CHEMICAL ENGINEERING JOURNAL , 2018 , 345 , 165-173 .
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