Vertically Aligned MoS2/Mo2C hybrid Nanosheets Grown on Carbon Paper for Efficient Electrocatalytic Hydrogen Evolution

Maximizing and creating active sites has been a general strategy to increase the performance of a catalyst. Because of the high electrocatalytic hydrogen evolution reactivity (HER) of ultrafine Mo2C nanocrystals and edges of two-dimensional MoS2, an electrode with a synergistic integration of these...

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Published in:ACS catalysis 2017-10, Vol.7 (10), p.7312-7318
Main Authors: Zhao, Zhenhuan, Qin, Fan, Kasiraju, Sashank, Xie, Lixin, Alam, Md Kamrul, Chen, Shuo, Wang, Dezhi, Ren, Zhifeng, Wang, Zhiming, Grabow, Lars C, Bao, Jiming
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Language:English
Subjects:
carburization
hybrid nanostructure
hydrogen evolution reaction
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Mo2C nanodomains
Mo−S−C motifs
vertical MoS2 nanosheets
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container_issue 10
container_start_page 7312
container_title ACS catalysis
container_volume 7
creator Zhao, Zhenhuan
Qin, Fan
Kasiraju, Sashank
Xie, Lixin
Alam, Md Kamrul
Chen, Shuo
Wang, Dezhi
Ren, Zhifeng
Wang, Zhiming
Grabow, Lars C
Bao, Jiming
description Maximizing and creating active sites has been a general strategy to increase the performance of a catalyst. Because of the high electrocatalytic hydrogen evolution reactivity (HER) of ultrafine Mo2C nanocrystals and edges of two-dimensional MoS2, an electrode with a synergistic integration of these two nanomaterials is expected to show a better HER performance. Here we report this hybrid nanostructure of vertically aligned MoS2/Mo2C nanosheets on conductive carbon paper. It was revealed that the original structure of MoS2 nanosheets remains intact after the carburization, but the surfaces are incorporated with either Mo2C nanodomains or a heteroatomic mixture of S and C. The hybrid catalyst exhibits a much lower HER overpotential in comparison to those of the corresponding Mo2C and MoS2 alone. Its high activity is congruent with DFT calculations, which show that multiple S and C coordinated Mo sites with near zero Gibbs free energy of hydrogen adsorption exist. Thus, the low overpotential of this binder-free hybrid catalyst is a result of active sites of Mo–S–C and highly dispersed Mo2C nanodomains on the original edges and basal planes of MoS2. Our prediction and realization of active HER sites with this hybrid two-dimensional nanostructure opens up a route toward the development of more active HER catalysts.
doi_str_mv 10.1021/acscatal.7b02885
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subjects carburization
hybrid nanostructure
hydrogen evolution reaction
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Mo2C nanodomains
Mo−S−C motifs
vertical MoS2 nanosheets
title Vertically Aligned MoS2/Mo2C hybrid Nanosheets Grown on Carbon Paper for Efficient Electrocatalytic Hydrogen Evolution
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