MoS2 Decorated Carbon Nanofibers as Efficient and Durable Electrocatalyst for Hydrogen Evolution Reaction

C. Zhang; Z. Wang; S. Bhoyate; T. Morey; Brooks L. Neria; Venkata Vasiraju; Gautam Gupta; Soubantika Palchoudhury; P. K. Kahol; S. R. Mishra; Felio Perez; Ram K. Gupta

doi:10.3390/c3040033

C (Oct 2017)

MoS2 Decorated Carbon Nanofibers as Efficient and Durable Electrocatalyst for Hydrogen Evolution Reaction

C. Zhang,
Z. Wang,
S. Bhoyate,
T. Morey,
Brooks L. Neria,
Venkata Vasiraju,
Gautam Gupta,
Soubantika Palchoudhury,
P. K. Kahol,
S. R. Mishra,
Felio Perez,
Ram K. Gupta

Affiliations

C. Zhang: Department of Chemistry, Pittsburg State University, 1701 S. Broadway, Pittsburg, KS 66762, USA
Z. Wang: Department of Chemistry, Pittsburg State University, 1701 S. Broadway, Pittsburg, KS 66762, USA
S. Bhoyate: Department of Chemistry, Pittsburg State University, 1701 S. Broadway, Pittsburg, KS 66762, USA
T. Morey: Department of Chemistry, Pittsburg State University, 1701 S. Broadway, Pittsburg, KS 66762, USA
Brooks L. Neria: Carl Junction High School, 206 South Roney, Carl Junction, MO 64834, USA
Venkata Vasiraju: Materials Physics and Applications (MPA-11), Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Gautam Gupta: Materials Physics and Applications (MPA-11), Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Soubantika Palchoudhury: Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, AL 35487, USA
P. K. Kahol: Department of Physics, Pittsburg State University, 1701 S. Broadway, Pittsburg, KS 66762, USA
S. R. Mishra: Department of Physics, The University of Memphis, Memphis, TN 38152, USA
Felio Perez: Integrated Microscopy Center, The University of Memphis, Memphis, TN 38152, USA
Ram K. Gupta: Department of Chemistry, Pittsburg State University, 1701 S. Broadway, Pittsburg, KS 66762, USA

DOI: https://doi.org/10.3390/c3040033
Journal volume & issue: Vol. 3, no. 4
p. 33

Abstract

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Hydrogen is an efficient fuel which can be generated via water splitting, however hydrogen evolution occurs at high overpotential, and efficient hydrogen evolution catalysts are desired to replace state-of-the-art catalysts such as platinum. Here, we report an advanced electrocatalyst that has low overpotential, efficient charge transfers kinetics, low Tafel slope and durable. Carbon nanofibers (CNFs), obtained by carbonizing electrospun fibers, were decorated with MoS2 using a facile hydrothermal method. The imaging of catalyst reveals a flower like morphology that allows for exposure of edge sulfur sites to maximize the HER process. HER activity of MoS2 decorated over CNFs was compared with MoS2 without CNFs and with commercial MoS2. MoS2 grown over CNFs and MoS2-synthesized produced about 374 and 98 times higher current density at −0.30 V (vs. Reversible Hydrogen Electrode, RHE) compared with the MoS2-commercial sample, respectively. MoS2-commercial, MoS2-synthesized and MoS2 grown over CNFs showed a Tafel slope of 165, 79 and 60 mV/decade, capacitance of 0.99, 5.87 and 15.66 mF/cm2, and turnover frequency of 0.013, 0.025 and 0.54 s−1, respectively. The enhanced performance of MoS2-CNFs is due to large electroactive surface area, more exposure of edge sulfur to the electrolyte, and easy charge transfer from MoS2 to the electrode through conducting CNFs.

Published in C

ISSN: 2311-5629 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Organic chemistry
Website: http://www.mdpi.com/journal/carbon

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