过电位
材料科学
电催化剂
催化作用
微波食品加热
溶剂
化学工程
合金
镧系元素
纳米技术
化学
电化学
物理化学
冶金
有机化学
电极
量子力学
物理
工程类
离子
作者
Nanzhu Nie,Dan Zhang,Zuochao Wang,Yingnan Qin,Xiaoming Zhai,Bo Yang,Jianping Lai,Lei Wang
出处
期刊:Small
[Wiley]
日期:2021-08-01
卷期号:17 (36)
被引量:24
标识
DOI:10.1002/smll.202102879
摘要
At present, it is still a great challenge to synthesize refractory Pt-based electrocatalysts with excellent active specific surface area, specific activity, and stability by a simple method. Here, a superfast and solvent-free microwave strategy is reported to synthesize refractory ultrafine (≈3 nm) Pt-lanthanide@Ketjen Black (PtM@KB, M = La, Gd, Tb, Er, Tm, and Yb) alloy with densely packed as efficient hydrogen evolution electrocatalysts in a domestic microwave oven for the first time. The optimized Pt61 La39 @KB delivers excellent hydrogen evolution reaction (HER) activity with a low overpotential of 38 mV (10 mA cm-2 ) and a high TOF value of 44.13 s-1 (100 mV) in 0.5 m H2 SO4 , and performs well in 1.0 m KOH. This method can also be used to grow catalysts on carbon cloth (CC) directly. PtLa@CC shows an overpotential of 99 mV (1000 mA cm-2 ) in 0.5 m H2 SO4 and can maintain activity after 500 h. Theoretical calculations reveal the enhanced stability and activity owing to the higher vacancy formation energy of Pt atoms and the optimized value of ΔGH* . Solvent-free microwave strategy constitutes a significant insight into the development of refractory electrocatalyst with ultrafine size and highly dense, which can also work well at high current densities.
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