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Epitaxial Growth of Ni(OH)2 Nanoclusters on MoS2 Nanosheets for Enhanced Alkaline Hydrogen Evolution Reaction

Abstract

MoS2 is a star catalyst for hydrogen evolution reaction (HER) in acidic media; however, the HER activity in alkaline media is deficient due to the sluggish water dissociation process. Herein, Ni(OH)2/MoS2 heterostructures with Ni(OH)2 nanoclusters epitaxially decorated on the surface of MoS2 are designed and synthesized towards enhanced alkaline HER kinetics. The required overpotential to reach a current density of 10 mA cm-2 is as low as 227 mV in 1M KOH for the optimal epitaxial Ni(OH)2/MoS2 heterostructure, which is decreased nearly 150 mV as compared with bare MoS2. The substantial increase in turnover frequency (TOF) demonstrates that the intrinsic activity is greatly improved after the incorporation of Ni(OH)2 clusters. The presence of Ni(OH)2 nanoclusters would provide additional water dissociation sites while MoS2 is ready for the adsorption and combination of the generated H*, and this so-called synergistic effect eventually induces significantly enhanced alkaline HER kinetics. The present results describe an interesting case of atomic-scale electrochemically inert material promoted HER process, and would open a new avenue into designing efficient hetero-nanostructures towards electrocatalysis applications.

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Publication details

The article was accepted on 13 Sep 2018 and first published on 14 Sep 2018


Article type: Paper
DOI: 10.1039/C8NR07045H
Citation: Nanoscale, 2018, Accepted Manuscript
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    Epitaxial Growth of Ni(OH)2 Nanoclusters on MoS2 Nanosheets for Enhanced Alkaline Hydrogen Evolution Reaction

    G. Zhao, Y. Lin, K. Rui, Q. Zhou, Y. Chen, S. Dou and W. Sun, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR07045H

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