Sub-grain boundaries by cold-rolling copper nanoparticles for boosting alkaline HER

Le Shuai; Chuanqi Cheng; Wenxuan Lv; Xinzhuo Hu; Chunyan Han; Zhe Li; Yanzhu Dai; Long Shang; Rui Zhang; Cunku Dong; Jing Yang; Hui Liu; Xi-Wen Du; Peng-Fei Yin

doi:10.1039/D6CC02036D

Sub-grain boundaries by cold-rolling copper nanoparticles for boosting alkaline HER

Le Shuai,^a Chuanqi Cheng,

*^ad Wenxuan Lv,^a Xinzhuo Hu,^a Chunyan Han,^a Zhe Li,^e Yanzhu Dai,^ac Long Shang,^a Rui Zhang,^a Cunku Dong,

^a Jing Yang,^a Hui Liu,

^abc Xi-Wen Du

*^abc and Peng-Fei Yin

*^ab

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* Corresponding authors

^a Institute of New-Energy Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
E-mail: tjuccq@tju.edu.cn, xwdu@tju.edu.cn, pengfeiyin@tju.edu.cn

^b State Key Laboratory of Precious Metal Functional Materials, Tianjin University, Tianjin, China

^c Core Facility Platform, Tianjin University, Tianjin 300354, China

^d Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China

^e Institute of Molecular Plus, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Abstract

We demonstrate a cold-rolling strategy that generates a high density of sub-grain boundaries in Cu nanoparticles, predominantly at particle interfaces. Experimental and theoretical analyses show that these sub-grain boundaries act as major contributing sites, facilitating interfacial water dissociation and lowering the energy barrier, thereby enhancing alkaline HER performance.

Chemical Communications

Sub-grain boundaries by cold-rolling copper nanoparticles for boosting alkaline HER

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