Novel and Facile Synthesis of Cu2-xS-Based Electrocatalysts for Selective CO2 Conversion into HCOOH

Stojkovikj, Sasho and El-Nagar, Gumaa A. and Firschke, Frederik and Najdoski, Metodija and Koleva, Violeta and Mayer, Matthew T. (2020) Novel and Facile Synthesis of Cu2-xS-Based Electrocatalysts for Selective CO2 Conversion into HCOOH. In: 71st Annual Meeting of the International Society of Electrochemistry “Electrochemistry towards Excellence”, 30 Aug - 4 Sept 2020, Belgrade - online.

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Abstract

Formic acid (HCOOH) is valuable feedstock chemical used in broad industrial fields as well as in fuel cells. The production of HCOOH via renewable energy driven electrochemical reduction of CO2 (CO2ER) is a promising strategy which combines renewable chemical synthesis, CO2 emissions mitigation, and energy storage. Various materials have been investigated as promising electrocatalyst materials for selective and efficient CO2 conversion into formate (e.g., Sn, Pb, In and CuxS). Among them, copper sulfide based electrocatalysts (Cu2-xS) are promising candidates due to their activity, non-toxicity, and chemical abundance. Moreover, the properties of Cu2-xS can be tuned by adjusting their stoichiometry, morphology and structure. Synthesis of CuxS with defined shape, size distribution, controlled stoichiometry, and defined crystal structure via a simple, low cost, and scalable processes is rather challenging. We propose a simple, novel and inexpensive route for synthesis of cuprous sulfides via a direct reaction between elemental copper and sulfur dissolved in CS2 and PhCH3 at room temperature. The as-synthesized materials were characterized using variety of techniques including SEM, XRD and XPS. The electrochemical measurements showed that HCOOH is the only CO2ER product (at ≤ –0.8 V vs RHE in CO2 sat. 0.1 M KHCO3). Further study is required to provide insight into the nature of the active site and the role of sulfur, and the subsequent mechanistic implications with reference to the conventionally described shift from carbophilic to oxophilic binding which characterizes the HCOOH pathway.

Item Type:	Conference or Workshop Item (Poster)
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:	06 Mar 2024 12:09
Last Modified:	06 Mar 2024 12:09
URI:	https://eprints.ugd.edu.mk/id/eprint/33820

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