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Issue 33, 2020
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Plasmon of Au nanorods activates metal–organic frameworks for both the hydrogen evolution reaction and oxygen evolution reaction

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Abstract

Electrocatalytic water splitting holds great promise for renewable energy conversion and storage systems. However, it usually suffers from sluggish kinetics, which greatly hinders its real application. Here, we demonstrate the utilization of the localized surface plasmon resonance (LSPR) of Au nanorods (AuNRs) to significantly improve the electroactivity of both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at Co-MOF nanosheets (Co-MOFNs) under different polarizations. Theoretical calculations suggest that the HER enhancement can be largely attributed to the injection of hot electrons from plasmonic AuNRs to Co-MOFN catalysts, which upraises the Fermi level of Co-MOFNs, increasing their reductive activity towards the HER. Regarding the promotion of the OER, it is indicated that the formed holes in Co-MOFNs should majorly locate on the surface oxygen atoms, which may also serve as active positions working jointly with neighboring Co atoms in oxidizing OH. The plasmon enhanced HER and OER electrocatalysis could also be observed over AuNR/Ni-MOFN and AuNR/NiCo-MOFN catalysts, suggesting the generality of this strategy. This study highlights the possibility of accelerating both the HER and OER efficiency by AuNR plasmonic excitation and provides a new route towards the design of more efficient water splitting systems with the assistance of light energy.

Graphical abstract: Plasmon of Au nanorods activates metal–organic frameworks for both the hydrogen evolution reaction and oxygen evolution reaction

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Supplementary files

Article information


Submitted
16 Jun 2020
Accepted
17 Jul 2020
First published
22 Jul 2020

Nanoscale, 2020,12, 17290-17297
Article type
Paper

Plasmon of Au nanorods activates metal–organic frameworks for both the hydrogen evolution reaction and oxygen evolution reaction

W. Zhang, S. Wang, S. A. Yang, X. Xia and Y. Zhou, Nanoscale, 2020, 12, 17290
DOI: 10.1039/D0NR04562D

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