Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 8, Pages 2941-2948Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c00425
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Funding
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2017M3D1A1039377]
- National Research Foundation of Korea (NRF) - Korea government (MIST) [NRF-2017R1A2B3012003]
- Institute of Engineering Research at Seoul National University
- Research Institute of Advanced Materials (RIAM) at Seoul National University
- Soft Foundry at Seoul National University
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A highly efficient CO2 electrolysis system could be created by introducing biomass oxidation as an alternative anodic reaction to the sluggish oxygen evolution reaction in a CO2-saturated and near-neutral electrolyte. Here, we successfully demonstrate anodic biomass oxidation by synthesizing 5 nm nickel oxide nanoparticles (NiO NPs). NiO NPs show a unique electrocatalytic activity for 5-hydroxymethylfurfural (HMF) oxidation under near-neutral conditions, exhibiting an anodic current onset (1 mA cm(-2)) at 1.524 V versus the reversible hydrogen electrode and a total Faradaic efficiency of <= 70%. Electrokinetic and in situ ultraviolet-visible spectroscopic analyses suggest that a redox active nickel hydroxide species is formed on the surface of NiO electrocatalysts during HMF oxidation, and this oxidation of Ni(II) hydroxide to Ni(III) oxyhydroxide could be the rate-determining step. This mechanistic study of biomass oxidation in a CO2-saturated electrolyte provides insight into constructing a highly efficient system for the paired electrolysis of CO2 reduction and biomass oxidation.
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