期刊
ELECTROCHIMICA ACTA
卷 314, 期 -, 页码 49-60出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.05.053
关键词
Doped carbon; Nickel nanoparticles; Waste biomass; Oxygen reduction/evolution reaction; Hydrogen evolution reaction
资金
- University of Sydney (USyd), Australia
High performance electrocatalysts based on nickel nanoparticles and biomass derived carbon were fabricated via a sustainable, inexpensive synthetic route utilizing waste carrot as a naturally occurring carbon precursor containing abundant amounts of phosphorus and oxygen. The electrocatalytic performance of the fabricated electrodes with variable nickel mass loadings (0 30 wt%) was investigated. For Ni mass loading of 19.3 wt%, the resulting Ni/P-doped carbon exhibits optimum catalytic activity for oxygen reduction (ORR), oxygen evolution (OER) and hydrogen evolution reaction (HER). The electrocatalyst reveals onset and half-wave potentials of 0.81 and 0.67 V vs. reversible hydrogen electrode (RHE), and a kinetic limiting current density of 13.66 mA cm(-2) at 0.1 V vs. RHE for ORR. The material exhibits modest Tafel slopes of 67.6 and 134.9 mV dec(-1) and overpotentials of 368 and 297 mV to reach a current density of 10 mA cm(-2) for OER and HER, respectively. The results on the composite physicochemical characteristics, electrochemically active surface area, ionic conductivity and ionic diffusivity reveal a sustainable process to fabricate eco-friendly, trifunctional electrocatalysts having high efficiency. (C) 2019 Elsevier Ltd. All rights reserved.
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