Construction of an N-Decorated Carbon-Encapsulated W2C/WP Heterostructure as an Efficient Electrocatalyst for Hydrogen Evolution in Both Alkaline and Acidic Media
Construction of an N-Decorated Carbon-Encapsulated W2C/WP Heterostructure as an Efficient Electrocatalyst for Hydrogen Evolution in Both Alkaline and Acidic Media
复制标题
N-修饰碳封装 W2C/WP 异质结构的构建作为碱性和酸性介质中析氢的高效电催化剂
DOI：
10.1021/acsami.1c16547
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发表时间：
2021
影响因子：
9.5
通讯作者：
Huang Yunhui
中科院分区：
文献类型：
--
作者：
Wei Peng;Sun Xueping;Wang Minhui;Xu Jiahao;He Zhimin;Li Xiaogang;Cheng Fangyuan;Xu Yue;Li Qing;Han Jiantao;Yang Hui;Huang Yunhui
碳化钨（W2 C）具有类铂的电子结构，在析氢反应中有望取代贵金属催化剂。然而，活性不高、电子传递缓慢、合成方法效率低，特别是纳米粒子的合成，严重阻碍了其大规模应用。本文构建了一种由W2 C和磷化钨（WP）嵌入氮修饰碳（W2 C/WP@NC）组成的新型异质结构作为高效的HER电催化剂。所制备的W2 C/WP@NC催化剂在酸和碱中均表现出显著的电催化活性和对HER的稳定性。更值得注意的是，W2 C/WP@NC催化剂显示出116.37和196.2 mV的低过电位，以提供10 mA cm-2的电流密度，并显示出在碱和酸中分别在12 h连续操作期间约6.4和7.64%的轻微电位衰减。以W2 C/WP@NC催化剂为阴极，工业RuO 2为阳极，在1.723 V的小槽电压下，可实现10 mA cm-2的总电流密度和12 h以上的长寿命电解，为探索可持续能源转换中的高性价比电催化剂提供了新的机会.
Tungsten carbide (W2C) has emerged as a potential alternative to noble-metal catalysts toward hydrogen evolution reaction (HER) owing to its Pt-like electronic configuration. However, unsatisfactory activity, dilatory electron transfer, and inefficient synthesizing methods, especially for nanoscale particles, have severely hindered its large-scale applications. Herein, a novel heterostructure composed of W2C and tungsten phosphide (WP) embedded in nitrogen-decorated carbon (W2C/WP@NC) was constructed as an efficient HER electrocatalyst. The as-prepared W2C/WP@NC catalyst exhibits remarkable electrocatalytic activity and robust durability toward HER both in acids and bases. More notably, the W2C/WP@NC catalyst demonstrates low overpotentials of 116.37 and 196.2 mV to afford a current density of 10 mA cm–2and reveals slight potential decays of about 6.4 and 7.64% over 12 h continuous operation in bases and acids, respectively. The overall water-splitting performance was further evaluated using the W2C/WP@NC catalyst as the cathode and commercial RuO2as the anode in an electrolyzer, which can realize an overall current density of 10 mA cm–2and maintain long durability of more than 12 h with a small cell voltage of 1.723 V. This work opens up new opportunities for exploring cost-efficient electrocatalysts in sustainable energy conversion.