Journal
MATERIALS TODAY CHEMISTRY
Volume 14, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtchem.2019.100207
Keywords
Hydrogen evolution reaction; Oxygen evolution reaction; Acidic and alkaline electrolytes; Molybdenum disulfide; Multiwalled carbon nanotubes; Ferromagnetic electrocatalysts
Funding
- U.S. Army Research Office (ARO) [W911NF-15-1-0319]
- National Science Foundation (NSF) [IIP-1701163]
- Bill and Melinda Gates Foundation [OPP1119542]
- University Grants Commission (UGC), New Delhi, India, under Raman Fellowship [F 5-139/2016(IC)]
- Bill and Melinda Gates Foundation [OPP1119542] Funding Source: Bill and Melinda Gates Foundation
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Hydrogen is considered as an ideal and sustainable energy carrier because of its high energy density and carbon-free combustion. Electrochemical water splitting is the only solution for uninterrupted, scalable, and sustainable production of hydrogen without carbon emission. However, a large-scale hydrogen production through electrochemical water splitting depends on the availability of earth-abundant electrocatalysts and a suitable electrolyte medium. In this article, we demonstrate that hydrogen evolution reaction (HER) performance of electrocatalytic materials can be controlled by their surface functionalization and selection of a suitable electrolyte solution. Here, we report syntheses of few-layered MoS2 nanosheets, NiO nanoparticles (NPs), and multiwalled carbon nanotubes (MWCNTs) using scalable production methods from earth-abundant materials. Magnetic measurements of as-produced electrocatalyst materials demonstrate that MoS2 nanoflakes are diamagnetic, whereas surface-functionalized MoS2 and its composite with carbon nanotubes have strong ferromagnetism. The HER performance of the few-layered pristine MoS2 nanoflakes, MoS2/NiO NPs, and MoS2/NiO NPs/MWCNT nanocomposite electrocatalysts are studied in acidic and alkaline media. For bare MoS2, the values of overpotential (eta(10)) in alkaline and acidic media are 0.45 and 0.54 V, respectively. Similarly, the values of current density at 0.5 V overpotential are 27 and 6.2 mA/cm(2) in alkaline and acidic media, respectively. The surface functionalization acts adversely in the both alkaline and acidic media. MoS2 nanosheets functionalized with NiO NPs also demonstrated excellent performance for oxygen evolution reaction with anodic current of similar to 60 mA/cm(2) and Tafel slope of 78 mVdec(-1) in alkaline medium. (C) 2019 The Authors. Published by Elsevier Ltd.
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