Facile Synthesis of CuxS Electrocatalysts for CO2 Conversion into Formate and Study of Relations Between Cu and S with the Selectivity

Stojkovikj, Sasho and El-Nagar, Gumaa A. and Gupta, Siddharth and Najdoski, Metodija and Koleva, Violeta and Tzanoudakis, Theocharis and Firschke, Frederik and Bogdanoff, Peter and Mayer, Matthew T. (2024) Facile Synthesis of CuxS Electrocatalysts for CO2 Conversion into Formate and Study of Relations Between Cu and S with the Selectivity. Advanced Functional Materials (241540). ISSN 1616-3028

Text (Research article in AFM (Impact Factor 18.5, Q1 Journal)) Adv Funct Materials - 2024 - Stojkovikj - Facile Synthesis of CuxS Electrocatalysts for CO2 Conversion into Formate and.pdf - Published Version Download (78kB)

Abstract

The conversion of CO2 into formate (HCOO−), a techno-economically feasible product, can be achieved using earth-abundant CuxS electrocatalysts, but questions remain regarding how catalyst structure, composition, and reaction environment influence product selectivity. A novel synthesis method based on electrodeposition of Cu foam and its subsequent sulfidation via immersion in sulfur saturated toluene solution resulted in CuxS foams. Catalytic activity studies found that HCOO− selectivity is dependent on electrochemical activation at higher overpotentials. To understand the effects of activation, determine the active forms of the catalysts, and identify the role of sulfur, the electrodes are carefully characterized as well as gaseous and sulfur dissolved in electrolyte. This included study of the effects of intentional addition of solution sulfur species, identification of the sulfur loss, determination of the electrode composition and relating sulfur speciation to observed product selectivity. It is found that residual sulfur stabilizes Cu+ during electrolysis at potentials favoring HCOO− production, in contrast to pristine Cu that undergoes complete reduction and shows poor HCOO− selectivity. Sulfur in both the catalyst and dissolved in electrolyte are of dynamic nature, and surface residues of SO42− species are identified in all activated catalysts which correspond with enhanced HCOO− production.

Item Type:	Article
Impact Factor Value:	18.5
Subjects:	Natural sciences > Chemical sciences Natural sciences > Earth and related environmental sciences Engineering and Technology > Environmental engineering Engineering and Technology > Materials engineering Natural sciences > Other natural sciences
Divisions:	Faculty of Technology
Depositing User:	Saso Stojkovik
Date Deposited:	04 Nov 2024 10:26
Last Modified:	04 Nov 2024 10:26
URI:	https://eprints.ugd.edu.mk/id/eprint/34939

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