电催化剂
化学
无机化学
水溶液
电解
氢
碱度
氨
制氢
电化学
吸附
X射线光电子能谱
电解水
分解
化学工程
电极
有机化学
物理化学
工程类
电解质
作者
Mingzhu Wu,Jun Du,Changyuan Tao,Zuohua Liu,Ying Liu
标识
DOI:10.1016/j.jcis.2019.01.085
摘要
Hydrogen is one of the most clean energy carriers because water is only the product of its combustion. The electrolysis of ammonia is expected to offer an attractive alternative to water electrolysis for the production of hydrogen because of the lower thermodynamic energy. However, the synthesis and utilization of high-performance Pt electrocatalysts have encountered challenges related to instability and hydroxyl ion sensitivity. To address these issues, we developed PtSnOx-based nanoparticles that maintained high electrocatalytic activity and stability for the decomposition of aqueous ammonia to generate hydrogen under native pH conditions which means the acidity/alkalinity is not adjusted. FT-IR, XRD, and XPS evidence showed PtSnOx was a tri-functionalised electrocatalyst. That is to say, the spherical SnOx nanoparticles assisted ammonia adsorption and activation, which were accompanied by a hydrogen adsorption on PtSnOx and hydrogen transfer along the SnOH bond over the electrocatalyst. According to these data of FT-IR, XRD, and XPS before and after reaction, a possible mechanism for the decomposition of aqueous ammonia to produce hydrogen was proposed. This study could pave the way to prospective routes for the selective oxidation of the NH bond to generate hydrogen under mild conditions.
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