Selective hydrogen evolution on manganese oxide coated electrodes: new cathodes for sodium chlorate production

Balazs Endrodi; Aleksandra Stojanovic; Maria Cuartero; Nina Simic; Mats Wildlock; Roland De Marco; Gaston A Crespo; Ann Cornell

doi:10.1021/acssuschemeng.9b01279

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Selective hydrogen evolution on manganese oxide coated electrodes: new cathodes for sodium chlorate production

Journal article

Peer reviewed

Selective hydrogen evolution on manganese oxide coated electrodes: new cathodes for sodium chlorate production

Balazs Endrodi, Aleksandra Stojanovic, Maria Cuartero, Nina Simic, Mats Wildlock, Roland De Marco, Gaston A Crespo and Ann Cornell

ACS Sustainable Chemistry & Engineering, Vol.7(14), pp.12170-12178

2019

DOI: https://doi.org/10.1021/acssuschemeng.9b01279

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Abstract

Cathode selectivity

HER

industrial electrochemistry

chemical technology

dichromate

The safety and feasibility of industrial electrochemical production of sodium chlorate, an important chemical in pulp and paper industry, depend on the selectivity of the electrode processes. The cathodic reduction of anodic products is sufficiently suppressed in the current technology by the addition of chromium(VI) to the electrolyte, but due to the high toxicity of these compounds, alternative pathways are required to maintain high process efficiency. In this paper, we evaluate the electrochemical hydrogen evolution reaction kinetics and selectivity on thermally formed manganese oxide coated titanium electrodes in hypochlorite and chlorate solutions. The morphology and phase composition of manganese oxide layers were varied via alteration of the annealing temperature during synthesis, as confirmed by scanning electron microscopy, X-ray diffraction, synchrotron radiation X-ray photoelectron spectroscopy, and near edge X-ray absorption fine structure spectroscopy measurements. As shown in mass spectroscopy coupled electrochemical measurements, the hydrogen evolution selectivity in hypochlorite and chlorate solutions is dictated by the phase composition of the coating. Importantly, a hydrogen evolution efficiency of above 95% was achieved with electrodes of optimized composition (annealing temperature, thickness) in hypochlorite solutions. Further, these electrode coatings are non-toxic and Earth abundant, offering the possibility of a more sustainable chlorate production.

Details

Title: Selective hydrogen evolution on manganese oxide coated electrodes: new cathodes for sodium chlorate production
Authors: Balazs Endrodi (Author)
Aleksandra Stojanovic (Author)
Maria Cuartero (Author)
Nina Simic (Author)
Mats Wildlock (Author)
Roland De Marco (Author) - University of the Sunshine Coast
Gaston A Crespo (Author)
Ann Cornell (Author)
Publication details: ACS Sustainable Chemistry & Engineering, Vol.7(14), pp.12170-12178
Publisher: American Chemical Society
Date published: 2019
DOI: 10.1021/acssuschemeng.9b01279
ISSN: 2168-0485
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99450671402621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Chemistry, Multidisciplinary; Engineering, Chemical; Green & Sustainable Science & Technology

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