材料科学
塔菲尔方程
无定形固体
纳米孔
催化作用
非晶态金属
制作
纳米技术
化学工程
金属
电化学
合金
冶金
物理化学
结晶学
电极
化学
医学
生物化学
替代医学
病理
工程类
作者
Chaoqun Pei,Shuangqin Chen,Tianchen Zhao,Mai Li,Zhaotao Cui,Baoan Sun,Sigui Hu,Si Lan,Horst Hahn,Tao Feng
标识
DOI:10.1002/adma.202200850
摘要
Metallic glasses (MGs), with high density of low coordination sites and high Gibbs free energy state, are novel promising and competitive candidates in the family of electrochemical catalysts. However, it remains a grand challenge to modify the properties of MGs by control of the disordered atomic structure. Recently, nanostructured metallic glasses (NGs), consisting of amorphous nanometer-sized grains connected by amorphous interfaces, have been reported to exhibit tunable properties compared to the MGs with identical chemical composition. Here, it is demonstrated that electrodeposited Ni-P NG is characterized by an extremely high energy state due to its heterogeneous structure, which significantly promotes the catalytic performance. Moreover, the Ni-P NG with a heterogeneous structure is a perfect precursor for the fabrication of unique honey-like nanoporous structure, which displays superior catalytic performance in the urea oxidation reaction (UOR). Specifically, modified Ni-P NG requires a potential of mere 1.36 V at 10 mA cm-2 , with a Tafel slope of 13 mV dec-1 , which is the best UOR performance in Ni-based alloys. The present work demonstrates that the nanostructurization of MGs provides a universal and effective pathway to upgrade the energy state of MGs for the design of high-performance catalysts in energy conversion.
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