催化作用
氧化物
钼
无机化学
钌
过电位
制氢
氢
塔菲尔方程
分解水
作者
Hari Krishna Sadhanala,Villa Krishna Harika,Tirupathi Rao Penki,Doron Aurbach,Aharon Gedanken
出处
期刊:Chemcatchem
[Wiley]
日期:2019-02-08
卷期号:11 (5): 1495-1502
被引量:21
标识
DOI:10.1002/cctc.201801990
摘要
Abstract Engineering of efficient, robust and inexpensive Pt‐free catalysts for the hydrogen evolution reaction has drawn great attention, and there is a rapidly growing demand for electrochemical water‐splitting reactions. Here, we report, for the first time, synthesis of ruthenium oxide nanoparticles supported on molybdenum oxide nanosheets (MoO 3 @RuO 2 ). This composite catalyst was prepared sonochemically, followed by calcination of the product in air at 400 °C for one hour. The as‐synthesized MoO 3 @RuO 2 composite catalyst was used to explore the electro‐catalytic hydrogen evolution reaction in acidic medium. Notably, compared to MoO 3 or RuO 2 , the composite exhibited high exchange current density of 0.57 mA cm −2 , and a current density of 10 mA cm −2 was achieved at low overpotential of 110 mV in 0.5 M H 2 SO 4 . The Tafel slope of the MoO 3 @RuO 2 catalyst was 62 mV dec −1 and it showed excellent stability. This remarkable performance can be attributed to the synergetic effect generated by the strong interaction between MoO 3 nanosheets and RuO 2 nanoparticles, which resulted in enhanced long‐term stability as well.
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