A general synthesis approach for amorphous noble metal nanosheets

Geng Wu, Xusheng Zheng, Peixin Cui, Hongyu Jiang, Xiaoqian Wang, Yunteng Qu, Wenxing Chen, Yue Lin, Hai Li, Xiao Han, Yanmin Hu, Peigen Liu, Qinghua Zhang, Jingjie Ge, Yancai Yao, Rongbo Sun, Yuen Wu, Lin Gu, Xun Hong () and Yadong Li ()
Additional contact information
Geng Wu: University of Science and Technology of China
Xusheng Zheng: University of Science and Technology of China
Peixin Cui: Chinese Academy of Sciences
Hongyu Jiang: Chinese Academy of Sciences
Xiaoqian Wang: University of Science and Technology of China
Yunteng Qu: University of Science and Technology of China
Wenxing Chen: Beijing Institute of Technology
Yue Lin: University of Science and Technology of China
Hai Li: Nanjing Technology University
Xiao Han: University of Science and Technology of China
Yanmin Hu: University of Science and Technology of China
Peigen Liu: University of Science and Technology of China
Qinghua Zhang: Chinese Academy of Sciences
Jingjie Ge: University of Science and Technology of China
Yancai Yao: University of Science and Technology of China
Rongbo Sun: University of Science and Technology of China
Yuen Wu: University of Science and Technology of China
Lin Gu: Chinese Academy of Sciences
Xun Hong: University of Science and Technology of China
Yadong Li: University of Science and Technology of China

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Noble metal nanomaterials have been widely used as catalysts. Common techniques for the synthesis of noble metal often result in crystalline nanostructures. The synthesis of amorphous noble metal nanostructures remains a substantial challenge. We present a general route for preparing dozens of different amorphous noble metal nanosheets with thickness less than 10 nm by directly annealing the mixture of metal acetylacetonate and alkali salts. Tuning atom arrangement of the noble metals enables to optimize their catalytic properties. Amorphous Ir nanosheets exhibit a superior performance for oxygen evolution reaction under acidic media, achieving 2.5-fold, 17.6-fold improvement in mass activity (at 1.53 V vs. reversible hydrogen electrode) over crystalline Ir nanosheets and commercial IrO2 catalyst, respectively. In situ X-ray absorption fine structure spectra indicate the valance state of Ir increased to less than + 4 during the oxygen evolution reaction process and recover to its initial state after the reaction.

Date: 2019
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DOI: 10.1038/s41467-019-12859-2

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