Volume 58, Issue 31 pp. 10713-10717
Communication

Boosting Electrocatalytic Hydrogen Evolution over Metal–Organic Frameworks by Plasmon-Induced Hot-Electron Injection

Shan-Shan Wang

Shan-Shan Wang

Key Laboratory of Biomedical Functional Materials, School of Science, China Pharmaceutical University, Nanjing, Jiangsu, 211198 China

These authors contributed equally to this work.

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Long Jiao

Long Jiao

Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026 China

These authors contributed equally to this work.

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Yunyang Qian

Yunyang Qian

Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026 China

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Wen-Chao Hu

Wen-Chao Hu

Key Laboratory of Biomedical Functional Materials, School of Science, China Pharmaceutical University, Nanjing, Jiangsu, 211198 China

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Dr. Gui-Yin Xu

Dr. Gui-Yin Xu

Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139 USA

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Prof. Dr. Chen Wang

Corresponding Author

Prof. Dr. Chen Wang

Key Laboratory of Biomedical Functional Materials, School of Science, China Pharmaceutical University, Nanjing, Jiangsu, 211198 China

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Prof. Dr. Hai-Long Jiang

Corresponding Author

Prof. Dr. Hai-Long Jiang

Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026 China

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First published: 03 June 2019
Citations: 155

Graphical Abstract

Some like it hot: A composite of Au nanorods/CoFe-MOF nanosheets (Au/CoFe-MOFNs) was used as an electrocatalyst for the hydrogen evolution reaction (HER). Au/CoFe-MOFNs give a four-fold increase of current density and a much reduced activation energy upon light irradiation as a result of hot-electron injection from plasmonic Au to CoFe-MOFNs.

Abstract

Efficient hydrogen evolution via electrocatalytic water splitting holds great promise in modern energy devices. Herein, we demonstrate that the localized surface plasmon resonance (LSPR) excitation of Au nanorods (NRs) dramatically improves the electrocatalytic hydrogen evolution activity of CoFe-metal–organic framework nanosheets (CoFe-MOFNs), leading to a more than 4-fold increase of current density at −0.236 V (vs. RHE) for Au/CoFe-MOFNs composite under light irradiation versus in dark. Mechanistic investigations reveal that the hydrogen evolution enhancement can be largely attributed to the injection of hot electrons from AuNRs to CoFe-MOFNs, raising the Fermi level of CoFe-MOFNs, facilitating the reduction of H2O and affording decreased activation energy for HER. This study highlights the superiority of plasmonic excitation on improving electrocatalytic efficiency of MOFs and provides a novel avenue towards the design of highly efficient water-splitting systems under light irradiation.

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