Gautam Jagadis, Meshesha Mikiyas Mekete, Chanda Debabrata, Gwon Jang Seok, Lee Gi-Sung, Hong Daewon, Yang Bee Lyong
Materials Science and Engineering Department, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea.
GHS (Green H2 System) Co., Ltd. Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea.
ACS Appl Mater Interfaces. 2023 Aug 30;15(34):40330-40342. doi: 10.1021/acsami.3c02943. Epub 2023 Aug 20.
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 (CuCoS-WS) nanowires on a Ni foam (NF) substrate. The nanowire arrays (CuCoS-WS/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 and 1.54 V (10 mA cm) for an electrolyzer in 1.0 M KOH, surpassing commercial and previously reported catalysts. A solar electrolyzer composed of CuCoS-WS 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 CuCoS-WS/NF in electrochemical water splitting.
将不同组分整合到异质结构中是一种新颖的方法，它可以增加活性中心的数量以提高催化剂的催化活性。本研究采用一种高效、简便的水热策略，在泡沫镍（NF）基底上合成了一种独特的硫化铜钴和二硫化钨（CuCoS-WS）纳米线异质结构。具有多个集成活性位点的纳米线阵列（CuCoS-WS/NF）在1.0 M KOH中，对于析氢反应（HER）和析氧反应（OER），在20（50）mA cm时过电位分别为202（299）和240（320）mV，对于电解槽在1.54 V（10 mA cm）时过电位也分别为202（299）和240（320）mV，超过了商业催化剂和先前报道的催化剂。由CuCoS-WS双功能电极组成的太阳能电解槽也通过水分解过程产生了大量氢气。这种卓越的性能归因于扩展的电活性表面积、费米能级附近合理的态密度、最佳的吸附自由能以及良好的电荷转移能力，进一步验证了CuCoS-WS/NF在电化学水分解中的优异双功能。
