Rational Design of a Copper Cobalt Sulfide/Tungsten Disulfide Heterostructure for Excellent Overall Water Splitting,ACS Applied Materials & Interfaces

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Rational Design of a Copper Cobalt Sulfide/Tungsten Disulfide Heterostructure for Excellent Overall Water Splitting
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-08-20 , DOI: 10.1021/acsami.3c02943
Jagadis Gautam _{1,

2} , Mikiyas Mekete Meshesha _{1,

2} , Debabrata Chanda _{1,

2} , Jang Seok Gwon _{1,

2} , Gi-Sung Lee ₃ , Daewon Hong ₃ , Bee Lyong Yang _{1,

2}

Affiliation

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.

中文翻译：

合理设计铜钴硫化物/二硫化钨异质结构以实现优异的整体水分解

将不同组分集成到异质结构中是一种增加活性中心数量以增强催化剂催化活性的新方法。本研究采用高效、简便的水热策略，在泡沫镍 (NF) 基底上合成了独特的硫化铜钴和二硫化钨 (CuCo ₂ S ₄ –WS _{2 ) 纳米线异质结构。}具有多个集成活性位点的纳米线阵列 (CuCo ₂ S ₄ –WS ₂ /NF) 在 20 (50) mA cm –2 和 1.54 V 下对 HER 和 OER 表现出 202 (299) 和 240 (320) mV 的小过电^势（1.0 M KOH 电解槽的电流为10 mA cm ^{–2 ），超过了商业和先前报道的催化剂。}_{由CuCo 2} S ₄ –WS ₂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的氢气。其卓越的性能归功于其扩大的电活性表面积、费米能级附近合理的态密度、最佳的吸附自由能和良好的电荷转移能力，进一步验证了CuCo 2 S 4 –WS 2 /NF在电化学_方面优异_的双重_功能。水分解。

更新日期：2023-08-20

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