Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 569, Issue -, Pages 286-297Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.02.063
Keywords
Self-supported electrodes; Nickel-palladium catalysts; Carbon nanofiber; Electrospinning; Atomic layer deposition; Hydrogen and oxygen evolution reactions
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Funding
- Egypt-France Joint Driver (STDF-IFE 2019) [31216]
- project H2020-MSCA-RISE-2017, 'CanBioSe' [778157]
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The most critical challenge in hydrogen fuel production is to develop efficient, eco-friendly, low-cost elec-trocatalysts for water splitting. In this study, self-supported carbon nanofiber (CNF) electrodes decorated with nickel/nickel oxide (Ni/NiO) and palladium (Pd) nanoparticles (NPs) were prepared by combining electrospinning, peroxidation, and thermal carbonation with atomic layer deposition (ALD), and then employed for hydrogen evolution and oxygen evolution reactions (HER/OER). The best CNF-Ni/NiO-Pd electrode displayed the lowest overpotential (63 mV and 1.6 V at j = 10 mA cm(-2)), a remarkably small Tafel slope (72 and 272 mV dec(-1)), and consequent exchange current density (1.15 and 22.4 mA cm(-2)) during HER and OER, respectively. The high chemical stability and improved electrocatalytic performance of the prepared electrodes can be explained by CNF functionalization via Ni/NiO NP encapsulation, the formation of graphitic layers that cover and protect the Ni/NiO NPs from corrosion, and ALD of Pd NPs at the surface of the self-supported CNF-Ni/NiO electrodes. (C) 2020 Elsevier Inc. All rights reserved.
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