材料科学
分解水
二硫化钨
钴
异质结
多硫化物
化学工程
纳米线
双功能
电化学
催化作用
纳米技术
无机化学
电极
光电子学
冶金
光催化
化学
生物化学
物理化学
电解质
工程类
作者
Jagadis Gautam,Mikiyas Mekete Meshesha,Debabrata Chanda,Jang Seok Gwon,Gi-Sung Lee,Deokhwa Hong,Bee Lyong Yang
标识
DOI:10.1021/acsami.3c02943
摘要
Integrating different components into a heterostructure is a novel approach that increases the number of active centers to enhance the catalytic activities of a catalyst. This study uses an efficient, facile hydrothermal strategy to synthesize a unique heterostructure of copper cobalt sulfide and tungsten disulfide (CuCo2S4-WS2) nanowires on a Ni foam (NF) substrate. The nanowire arrays (CuCo2S4-WS2/NF) with multiple integrated active sites exhibit small overpotentials of 202 (299) and 240 (320) mV for HER and OER at 20 (50) mA cm-2 and 1.54 V (10 mA cm-2) for an electrolyzer in 1.0 M KOH, surpassing commercial and previously reported catalysts. A solar electrolyzer composed of CuCo2S4-WS2 bifunctional electrodes also produced significant amounts of hydrogen through a water splitting process. The remarkable performance is accredited to the extended electroactive surface area, reasonable density of states near the Fermi level, optimal adsorption free energies, and good charge transfer ability, further validating the excellent dual function of CuCo2S4-WS2/NF in electrochemical water splitting.
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