Volume 133, Issue 1 pp. 470-476
Forschungsartikel

Size-Dependent Activity and Selectivity of Atomic-Level Copper Nanoclusters during CO/CO2 Electroreduction

Dr. Weifeng Rong

Dr. Weifeng Rong

Department of Chemistry and Shenzhen Grubbs institute, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong, 518055 P. R. China

School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui, 230026 P. R. China

These authors contributed equally to this work.

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Haiyuan Zou

Haiyuan Zou

Department of Chemistry and Shenzhen Grubbs institute, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong, 518055 P. R. China

School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001 P. R. China

These authors contributed equally to this work.

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Wenjie Zang

Wenjie Zang

Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore, 117574 Singapore

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Shibo Xi

Shibo Xi

Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, 627833 Singapore

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Dr. Shuting Wei

Dr. Shuting Wei

Department of Chemistry and Shenzhen Grubbs institute, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong, 518055 P. R. China

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Dr. Baihua Long

Dr. Baihua Long

Department of Chemistry and Shenzhen Grubbs institute, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong, 518055 P. R. China

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Junhui Hu

Junhui Hu

Department of Chemistry and Shenzhen Grubbs institute, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong, 518055 P. R. China

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Prof. Dr. Yongfei Ji

Prof. Dr. Yongfei Ji

School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, Guangdong, 510006 P. R. China

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Prof. Dr. Lele Duan

Corresponding Author

Prof. Dr. Lele Duan

Department of Chemistry and Shenzhen Grubbs institute, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong, 518055 P. R. China

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First published: 18 September 2020
Citations: 16

Abstract

As a favorite descriptor, the size effect of Cu-based catalysts has been regularly utilized for activity and selectivity regulation toward CO2/CO electroreduction reactions (CO2/CORR). However, little progress has been made in regulating the size of Cu nanoclusters at the atomic level. Herein, the size-gradient Cu catalysts from single atoms (SAs) to subnanometric clusters (SCs, 0.5–1 nm) to nanoclusters (NCs, 1–1.5 nm) on graphdiyne matrix are readily prepared via an acetylenic-bond-directed site-trapping approach. Electrocatalytic measurements show a significant size effect in both the activity and selectivity toward CO2/CORR. Increasing the size of Cu nanoclusters will improve catalytic activity and selectivity toward C2+ productions in CORR. A high C2+ conversion rate of 312 mA cm−2 with the Faradaic efficiency of 91.2 % are achieved at −1.0 V versus reversible hydrogen electrode (RHE) over Cu NCs. The activity/selectivity-size relations provide a clear understanding of mechanisms in the CO2/CORR at the atomic level.

Conflict of interest

The authors declare no conflict of interest.

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