JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2024
·
IF 2.3
Sun Xingjie,Zhang Wei-chao,Umar Ahmad,Wu Xiang
Bimetallic/polymetallic cobaltite possesses abundant redox reactions, high conductivity and theoretical capacity. This feature makes them a research focus of electrode materials for capacitor. In this study, we synthesize ZnCo 2 S 4 nanowires grown uniformly on Ni substrate through a controllable two-step hydrothermal strategy. The synthesized samples are used as cathode materials. The assembled supercapacitor delivers a specific capacitance of 81.66 C g −1 at a current density of 0.5 A g −1 . It keeps 73% of the initial capacitance after 15000 times cycling and an energy density of 85 Wh kg −1 at 2970 W kg −1 . These properties indicate their potential applications in future portable micro/nano and high-performance electrochemical devices. Graphical Abstract In this study, we synthesize ZnCo 2 S 4 nanowires grown uniformly on Ni substrate through a controllable two-step hydrothermal strategy. The assembled supercapacitor delivers a specific capacitance of 81.66 C g −1 at a current density of 0.5 A g −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2019
·
IF 4.197
Guotao Song,Zhichao Wang,Junwei Sun,Jiankun Sun,Ding Yuan,Lixue Zhang
Exploring transition metal-based, highly efficient and bifunctional catalysts for electrochemical water splitting remains a challenging task. Herein, ZnCo 2 S 4 nanosheet array supported on nickel foam (ZnCo 2 S 4 /NF) is fabricated and demonstrated to be efficacious electrocatalyst for both oxygen evolution and hydrogen evolution reactions. The resulting catalyst affords overpotentials of only 278 mV to achieve 10 mA cm − 2 towards oxygen evolution and 185 mV to reach 10 mA cm − 2 towards hydrogen evolution with superior stability in alkaline solution. The assembled two-electrode water electrolyzer using ZnCo 2 S 4 /NF can reach a current density of 10 mA cm − 2 by 1.66 V cell voltage.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Zhiqian Hou,Shan Feng,Peng Hei,Tingshuai Yang,Zhiqun Ran,Ruixin Zheng,Xin Liao,Chaozhu Shu,Jianping Long
The development of high-efficiency oxygen electrode with well structural and chemical stability is critical to boost the rapid development of lithium-oxygen (Li-O 2 ) batteries. Which are reckoned as a potent contender for next-generation energy storage devices due to their ultra-high theoretical energy density . Here, a flower-like three-dimensional self-standing ZnCo 2 S 4 -based electrode without an addition of binders are fabricated and employing as positive electrode for Li-O 2 batteries. The bifunctional catalytic activity of flower-like ZnCo 2 S 4 is conducive to improving the hysteresis kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Representative ultrathin petal edge exposes adequate active sites and provides a sufficient contact interface between Li 2 O 2 and positive electrode, which are essential for reducing the charge overpotential during OER. Compared with the control electrodes, the flower-like ZnCo 2 S 4 @Ni-based Li-O 2 battery shows decreased overpotential (0.78 V) and improved cycle stability (over 500 cycles).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Fucheng Yu,Haiyang Chen,Xin Tian,Yadong Zhou,Junpeng Cui,Cuixia Li,Jianbin Zhang,Xianxi Tang,Yangshuo Liu
A new binary composite photocatalyst consisting of ZnO hollow nanospheres and ZnCo 2 S 4 nanoparticles was prepared by a two-step method. Carbon nanospheres as templates for the preparation of ZnO hollow nanospheres were synthesized by a hydrothermal method . Using X-ray photoelectron spectroscopy (XPS), ultraviolet visible diffuse reflectance spectroscopy (UV vis DRS) and Mott Schottky curve measurements, the regulated band structure of the composite was determined, and then the type-II carrier transfer mechanism in the composite was identified. The effect of the mass ratio of ZnCo 2 S 4 to ZnO on the photocatalytic performance of the composite was investigated. With the increase in the mass ratio of ZnCo 2 S 4 to ZnO, the photocatalytic performance of the composite first increases and then decreases, and the composite sample with a mass ratio of 30% shows the best performance. Furthermore, the introduction of oxygen vacancy (V O ) defects into ZnO hollow nanospheres not only improves the photocatalytic performance of the composite but also greatly improves photocorrosion resistance. Therefore, the newly discovered ZnCo 2 S 4 /ZnO composite photocatalyst has potential practical applications.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Xiaojun Dai,Sheng Feng,Wei Wu,Yun Zhou,Zhiwei Ye,Xun Cao,Yang Wang,Chengdeng Yang
In this study, ZnCo 2 S 4 (ZCS) nanoparticles were coupled on the surface of TiO 2 by simple solvothermal method to form S-scheme heterojunction. Compared with ZCS and TiO 2 , the photocatalytic performance of ZCS/TiO 2 under simulated sunlight is significantly improved, and its hydrogen evolution efficiency reaches 5580 μmol·g −1 ·h −1 with the apparent quantum efficiency (AQY) up to 11.5% at 420 nm, which is 88.3 times and 54.3 times that of TiO 2 and ZCS, respectively. Moreover, ZCS/TiO 2 also has excellent performance in the photocatalytic degradation of tetracycline (TC). The enhancement of photocatalytic performance of ZCS/TiO 2 is mainly due to S-scheme heterojunction. On the one hand, the S-scheme electron transfer path not only improves the electron-hole separation efficiency, but also improves the charge transfer efficiency. On the other hand, ZCS significantly enhances the visible light absorption of ZCS/TiO 2 . The photocatalytic mechanism and S-scheme heterojunction structure is confirmed by XPS , EPR , ultraviolet photoelectron spectroscopy (UPS) and energy band structure . This work provides a new idea for designing and constructing S-scheme heterojunction to improve the performance of photocatalytic hydrogen evolution and TC degradation.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2026
·Vol. 19
·期 9
·e70704
·
IF 5.9
Qianran Feng,Jiawei Xie,Xinyuan Xu,Liuyun Chen,Zuzeng Qin,Tongming Su
Hydrogen energy, as a new, clean and renewable energy, has great potential to address the global energy crisis and environmental pollution. This study presents a ZnCo 2 S 4 /ZnIn 2 S 4 (ZCS/ZIS) heterojunction photocatalyst, where the charge transfer mechanism ingeniously transforms the role of ZnCo 2 S 4 . While individually photocatalytically inactive, ZnCo 2 S 4 becomes crucial in the ZCS/ZIS composite. Driven by a built-in electric field arising from their difference in Fermi level, a direct Z-scheme charge flow is established. This flow not only facilitates the separation of photogenerated electrons and holes at the interface but also, more importantly, activates ZnCo 2 S 4 as a primary electron aggregation site. Consequently, strongly reductive electrons are efficiently enriched on ZnCo 2 S 4 for the hydrogen evolution reaction. The optimized ZCS/ZIS composite achieves an exceptional H 2 production rate of 6.60 mmol g −1 h −1 under visible light, which is 9.3 times that of ZnIn 2 S 4 , with an apparent quantum yield of 7.96% at 400 nm. This work highlights the strategic design of charge dynamics to unlock the latent functionality of components within a Z-scheme system. Graphical This work constructs a ZnCo 2 S 4 /ZnIn 2 S 4 Z-scheme heterojunction, where the charge flow ingeniously transforms inactive ZnCo 2 S 4 into a crucial electron-aggregation site. This strategic design simultaneously achieves efficient charge separation and preserves high redox potential, leading to a dramatically enhanced photocatalytic H 2 evolution rate under visible light.
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DOI
高影响因子
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