Wang Dewen, Li Qun, Han Ce, Xing Zhicai, Yang Xiurong
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China.
University of Science and Technology of China, Hefei 230026, China.
ACS Cent Sci. 2018 Jan 24;4(1):112-119. doi: 10.1021/acscentsci.7b00502. Epub 2017 Dec 7.
The development of low-cost, high-efficiency, and stable bifunctional electrocatalysts toward the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is of paramount importance for large-scale water splitting. Here, we develop a new strategy for the first design and synthesis of a NiO@Ni decorated WS nanosheet array on carbon cloth (NiO@Ni/WS/CC) composite. This composite serves as a unique three-dimensional (3D) synergistic electrocatalyst that not only combines the intrinsic properties of individual NiO@Ni and WS, but also exhibits significantly improved HER and OER activities when compared to that of pure NiO@Ni and WS. This electrocatalyst possesses Pt-like activity for HER and exhibits better OER performance than that for commercial RuO, as well as demonstrating superior long-term durability in alkaline media. Furthermore, it enables an alkaline electrolyzer with a current density of 10 mA cm at a cell voltage as 1.42 V, which is the lowest one among all reported values to date. The excellent performance is mainly attributed to the unique 3D configuration and multicomponent synergies among NiO, Ni, and WS. Our findings provide a new idea to design advanced bifunctional catalysts for water splitting.
开发低成本、高效率且稳定的用于析氢反应（HER）和析氧反应（OER）的双功能电催化剂对于大规模水分解至关重要。在此，我们首次开发了一种新策略，用于设计和合成碳布上的NiO@Ni修饰的WS纳米片阵列（NiO@Ni/WS/CC）复合材料。这种复合材料作为一种独特的三维（3D）协同电催化剂，不仅结合了单个NiO@Ni和WS的固有特性，而且与纯NiO@Ni和WS相比，还表现出显著提高的HER和OER活性。这种电催化剂对HER具有类似Pt的活性，并且比商业RuO表现出更好的OER性能，同时在碱性介质中具有优异的长期耐久性。此外，它能使碱性电解槽在电池电压为1.42 V时实现10 mA cm的电流密度，这是迄今为止所有报道值中最低的。优异的性能主要归因于NiO、Ni和WS之间独特的3D结构和多组分协同作用。我们的发现为设计用于水分解的先进双功能催化剂提供了新思路。
