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Research Article

Robust enhanced hydrogen production at acidic conditions over molybdenum oxides-stabilized ultrafine palladium electrocatalysts

Ji Sun1,2,§, Xian Zhang1,§, Meng Jin1,2, Qizhong Xiong1, Guozhong Wang1, Haimin Zhang1( ), Huijun Zhao1,3( )
Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Anhui Key Laboratory of Nanomaterials and Nanotechnology, CAS Center for Excellence in Nanoscience Institute, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
University of Science and Technology of China, Hefei 230026, China
Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus, QLD 4222, Australia

§ Ji Sun and Xian Zhang contributed equally to this work.

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Graphical Abstract

Abstract

Electrochemical water splitting is quite seductive for eco-friendly hydrogen fuel energy production, however, the attainment of highly efficient, durable, and cheap catalysts for the hydrogen evolution reaction (HER) remains challenging. In this study, molybdenum oxides stabilized palladium nanoparticle catalysts (MoOx-Pd) are in situ prepared on commercial carbon cloth (CC) by the facile two-step method of dip-coating and electrochemical reduction. As a self-supported Pd-based catalyst electrode, the MoOx-Pd/CC presents a competitive Tafel slope of 45.75 mV·dec-1, an ultralow overpotential of 25 mV, and extremely long cycling durability (one week) in 0.5 M H2SO4 electrolyte, superior to unmodified Pd catalysts and comparable to commercial Pt mesh electrode. On the one hand, the introduction of MoOx can inhibit the growth of Pd particles to obtain ultrafine Pd nanoparticles, thus exposing more available active sites. On the other hand, density functional theory (DFT) calculation revealed that MoOx on the surface of Pd metal can regulate the electronic structure of Pd metal and enhance its intrinsic catalytic activity of HER. This work suggests that transitional metal nanoparticles stabilized by molybdenum oxides are hopeful approaches for obtaining fruitful hydrogen-producing electrocatalysts.

Keywords

MoOxPd nanoparticleselectrocatalystshydrogen evolution reaction

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Nano Research
Volume 14 Issue 1,
January 2021
Pages 268-274
DOI: 10.1007/s12274-020-3083-3
Cite this article:
Sun J, Zhang X, Jin M, et al. Robust enhanced hydrogen production at acidic conditions over molybdenum oxides-stabilized ultrafine palladium electrocatalysts. Nano Research, 2021, 14(1): 268-274. https://doi.org/10.1007/s12274-020-3083-3
Topics:
Catalyst activityDensity functional theoryElectrocatalystsElectrodesElectrolytesElectrolytic reduction Electronic structureHydrogen evolution reaction Hydrogen fuelsHydrogen productionMetal nanoparticlesMolybdenum oxideNanocatalystsPalladium

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Received: 15 July 2020
Revised: 27 July 2020
Accepted: 31 August 2020
Published: 05 January 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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