When [email protected] Meets WS2 Nanosheet Array: A Highly Efficient and Ultrastable Electrocatalyst for Overall Water Splitting,ACS Central Science

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When [email protected] Meets WS2 Nanosheet Array: A Highly Efficient and Ultrastable Electrocatalyst for Overall Water Splitting
ACS Central Science ( IF 12.7 ) Pub Date : 2017-12-07 00:00:00 , DOI: 10.1021/acscentsci.7b00502
Dewen Wang _{1,

2} , Qun Li _{1,

2} , Ce Han ₁ , Zhicai Xing ₁ , Xiurong Yang ₁

Affiliation

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 [email protected] decorated WS₂ nanosheet array on carbon cloth ([email protected]/WS₂/CC) composite. This composite serves as a unique three-dimensional (3D) synergistic electrocatalyst that not only combines the intrinsic properties of individual [email protected] and WS₂, but also exhibits significantly improved HER and OER activities when compared to that of pure [email protected] and WS₂. This electrocatalyst possesses Pt-like activity for HER and exhibits better OER performance than that for commercial RuO₂, 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^–2 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 WS₂. Our findings provide a new idea to design advanced bifunctional catalysts for water splitting.

中文翻译：

当 [email protected] 遇见 WS2 纳米片阵列：一种高效且超稳定的整体水分解电催化剂

开发低成本、高效、稳定的析氢反应（HER）和析氧反应（OER）双功能电催化剂对于大规模水分解至关重要。在这里，我们开发了一种新策略，用于首次设计和合成碳布（[email protected]/WS ₂ /CC）复合材料上的[email protected]装饰WS ₂纳米片阵列。这种复合材料作为一种独特的三维 (3D) 协同电催化剂，不仅结合了个体 [email protected] 和 WS ₂的固有特性，而且与纯 [email protected] 相比，还表现出显着改善的 HER 和 OER 活性和WS ₂ 。该电催化剂具有类似 Pt 的 HER 活性，并且表现出比商业 RuO ₂更好的 OER 性能，并且在碱性介质中表现出优异的长期耐久性。此外，它使得碱性电解槽的电流密度为10 mA cm ^–2 ，电池电压为1.42 V，这是迄今为止所有报告值中最低的。优异的性能主要归功于独特的3D构型以及NiO、Ni和WS ₂之间的多组分协同作用。我们的研究结果为设计先进的水分解双功能催化剂提供了新思路。

更新日期：2017-12-07

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