Turing Structuring with Multiple Nanotwins to Engineer Efficient and Stable Catalysts for Hydrogen Evolution Reaction

Overview

Journal Nat Commun

Specialty Biology

Date 2023 Sep 4

PMID 37666814

Authors

Jialun Gu

Lanxi Li

Youneng Xie

Bo Chen

Fubo Tian

Yanju Wang

Jing Zhong

Junda Shen

Jian Lu

Affiliations

Soon will be listed here.

Abstract

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 demonstrates at least 500 h stability at 1000 mA cm, 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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