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Size‐Dependent Selectivity of Electrochemical CO 2 Reduction on Converted In 2 O 3 Nanocrystals
Author(s) -
Huang Yang,
Mao Xinnan,
Yuan Guotao,
Zhang Duo,
Pan Binbin,
Deng Jun,
Shi Yunru,
Han Na,
Li Chaoran,
Zhang Liang,
Wang Lu,
He Lin,
Li Youyong,
Li Yanguang
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202105256
Subject(s) - oleylamine , overpotential , selectivity , catalysis , materials science , nanoparticle , electrochemistry , nanocrystal , chemical engineering , nanotechnology , indium , chemistry , electrode , organic chemistry , optoelectronics , engineering
The size modulation of catalyst particles represents a useful dimension to tune catalytic performances by impacting not only their surface areas but also local electronic structures. It, however, has remained inadequately explored and poorly elucidated. Here, we report the interesting size‐dependent selectivity of electrochemical CO 2 reduction on In 2 O 3 nanocrystals. 5‐nm nanoparticles and 15‐nm nanocubes with focused size distribution are prepared via a facile solvothermal reaction in oleylamine by carefully controlling a set of experimental parameters. They serve as the precatalysts, and are reduced to In nanocrystals while largely inherit the original size feature during electrochemical CO 2 reduction. Catalyst derived from 15‐nm nanocubes exhibits greater formate selectivity (>95 %) at lower overpotential and negligible side reactions compared to bulk‐like samples (indium foil and 200‐nm cubes) as well as the catalyst derived from smaller 5‐nm nanoparticles. This unique size dependence is rationalized as a result of the competition among different reaction pathways by our theoretical computations. Smaller is not always better in the catalyst design.