塔菲尔方程
过电位
催化作用
材料科学
纳米颗粒
化学工程
离解(化学)
纳米技术
碳纳米管
铂金
纳米管
化学
电极
电化学
物理化学
有机化学
工程类
作者
Kefeng Wang,Qi Chen,Yingyan Hu,Wei Wei,Songzhu Wang,Qi Shen,Peng Qu
出处
期刊:Small
[Wiley]
日期:2018-08-14
卷期号:14 (37)
被引量:70
标识
DOI:10.1002/smll.201802132
摘要
Abstract Nowadays, the state‐of‐the‐art electrocatalysts for hydrogen evolution reaction (HER) are platinum group metals. Nonetheless, Pt‐based catalysts show decreased HER activity in alkaline media compared with that in acidic media due to the sluggish dissociation process of H 2 O on the surface of Pt. With a cost 1/25 that of Pt, Ru demonstrates a favorable dissociation kinetics of absorbed H 2 O. Herein, crystalline Ru 0.33 Se nanoparticles are decorated onto TiO 2 nanotube arrays (TNAs) to fabricate Ru 0.33 Se @ TNA hybrid for HER. Owing to the large‐specific surface area, Ru 0.33 Se nanoparticles are freely distributed and the particle aggregation is eliminated, providing more active sites. The contracted electron transport pathway rendered by TiO 2 nanotubes and the synergistic effect at the interface significantly improve the charge transfer efficiency in the hybrid catalyst. Compared with Ru 0.33 Se nanoparticles deposited directly on the Ti foil (Ru 0.33 Se/Ti) or carbon cloth (Ru 0.33 Se/CC), Ru 0.33 Se @ TNA shows an enhanced catalytic activity with an overpotential of 57 mV to afford a current density of 10 mA cm −2 , a Tafel slope of 50.0 mV dec −1 . Furthermore, the hybrid catalyst also exhibits an outstanding catalytic stability. The strategy here opens up a new synthetic avenue to the design of highly efficient hybrid electrocatalysts for hydrogen production.
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