催化作用
氢
图灵
材料科学
纳米材料基催化剂
离解(化学)
计算机科学
化学物理
纳米技术
化学工程
化学
纳米颗粒
物理化学
生物化学
有机化学
工程类
程序设计语言
作者
Jialun Gu,Lanxi Li,Youneng Xie,Bo Chen,Fubo Tian,Yanju Wang,Jing Zhong,Junda Shen,Jian Lü
标识
DOI:10.1038/s41467-023-40972-w
摘要
Low-dimensional nanocrystals with controllable defects or strain modifications are newly emerging active electrocatalysts for hydrogen-energy conversion and utilization; however, a crucial challenge remains in insufficient stability due to spontaneous structural degradation and strain relaxation. Here we report a Turing structuring strategy to activate and stabilize superthin metal nanosheets by incorporating high-density nanotwins. Turing configuration, realized by constrained orientation attachment of nanograins, yields intrinsically stable nanotwin network and straining effects, which synergistically reduce the energy barrier of water dissociation and optimize the hydrogen adsorption free energy for hydrogen evolution reaction. Turing PtNiNb nanocatalyst achieves 23.5 and 3.1 times increase in mass activity and stability index, respectively, compared against commercial 20% Pt/C. The Turing PtNiNb-based anion-exchange-membrane water electrolyser with a low Pt mass loading of 0.05 mg cm-2 demonstrates at least 500 h stability at 1000 mA cm-2, disclosing the stable catalysis. Besides, this new paradigm can be extended to Ir/Pd/Ag-based nanocatalysts, illustrating the universality of Turing-type catalysts.
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