Mechanistic Investigation of Biomass Oxidation Using Nickel Oxide Nanoparticles in a CO2-Saturated Electrolyte for Paired Electrolysis
| Autor: | Kang Hee Cho, Mani Balamurugan, Seungwoo Choi, Hongmin Seo, Kang-Gyu Lee, Sunghak Park, Ki Tae Nam |
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| Rok vydání: | 2020 |
| Předmět: |
Electrolysis
Nickel oxide Inorganic chemistry Oxygen evolution chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Nickel chemistry law Hydroxide Reversible hydrogen electrode General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Faraday efficiency |
| Zdroj: | The Journal of Physical Chemistry Letters. 11:2941-2948 |
| ISSN: | 1948-7185 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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