A highly mismatched NiO2-to-Pd hetero-structure as an efficient nanocatalyst for the hydrogen evolution reaction

Dinesh Bhalothia, Lin Shuan, Yi Jia Wu, Che Yan, Kuan Wen Wang, Tsan Yao Chen

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Efficient generation of hydrogen from water is a key enabling technology towards alternative power generation sources. In this context, search for highly active and low-cost nanocatalysts (NCs) for the hydrogen evolution reaction (HER) is a crucial endeavour. In the present study, bimetallic NiPd with a novel epitaxial structure of tetrahedral symmetric Ni oxide (NiOT) to metallic Pd contact (denoted as NiPd-CNT) has been fabricated on a carbon nanotube (CNT) supportviaa wet chemical reduction method to boost HER kinetics in an acidic medium (0.5 M H2SO4). This unique structure exhibits superior catalytic activity towards the HER with a significantly lower overpotential of 46 mV (at a current density of 10 mA cm−2). Moreover, the NiPd-CNT NC showed a low Tafel slope of 38.0 mV dec−1. The overpotential and Tafel slope values are 50 mV and 22.18 mV dec−1lower, respectively, as compared to those of the standard Pd-CNT NC and very close to the those of the commercial J.M.-Pt/C (30 wt% Pt) NC (overpotential is 44 mV@10 mA cm−2and the Tafel slope is 30.2 mV dec−1). Of special relevance, the as-prepared NiPd-CNT NC exhibits nearly ∼95% stability when operated for 1000 cycles. Such a competitive HER performance is attributed to the formation of active sites on the catalyst surface due to strong lattice mismatch and electronegativity difference (χPdNi) at the heterogonous binary interface of NiO2and Pd nanocrystals. In light of the competitive activity as compared to that of commercial J.M.-Pt/C with low cost, Pd-based bimetallic NCs can serve as a promising alternative to Pt for seizing the market.

Original languageEnglish
Pages (from-to)2541-2550
Number of pages10
JournalSustainable Energy and Fuels
Volume4
Issue number5
DOIs
StatePublished - May 2020

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