纳米孔
材料科学
甲醇
合金
吸附
氢氧化钾
电化学
化学工程
水溶液
分子
氢氧化物
扩散
无机化学
纳米技术
电极
复合材料
有机化学
化学
物理化学
工程类
物理
热力学
作者
Yanyan Song,Ying Chen,Lizhong He,Yue Wu,Xiaohui He,Xiaolei Su
出处
期刊:NANO
[World Scientific]
日期:2021-11-01
卷期号:16 (12)
标识
DOI:10.1142/s1793292021501460
摘要
The self-supporting three-dimensional (3D) nanoporous PdAg alloy (NP–PdAg) foams have been prepared by a simple one-step dealloying melt-spun Al–Pd–Ag ribbons in a 20[Formula: see text]wt.% NaOH aqueous solution at 90 ∘ C for 1.5[Formula: see text]h. The structure is advantageous to the diffusion and removal of the intermediate products and the transmission of the methanol molecules. The NP–PdAg foams exhibit better electrocatalytic performance than the NP-Pd foam toward the methanol oxidation in potassium hydroxide (KOH) solution. The optimal atomic ratio of Pd to Ag in the NP–PdAg foams is 1:1, and its electrocatalytic activity is about 2.6 times that of the NP–Pd foam. The significant improvement in the electrocatalytic performance is attributed to the addition of a moderate amount of Ag. In the whole electrocatalytic process, Ag can provide OH ads to oxidize the intermediate products on the surface of active Pd sites into carbon dioxide or other cleaning products. Also, the Ag can increase electrochemical active surface area and the adsorption energy of Pd to methanol molecules and OH ads . These significantly prevent the accumulation of poisoning intermediates on the surface of Pd and quickly release more active Pd sites.
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