Facile Synthesis of Hierarchical CuS and CuCo2S4 Structures from an Ionic Liquid Precursor for Electrocatalysis Applications

Abouserie, Ahed and El-Nagar, Gumaa A. and Heyne, Benjamin and Günter, Christina and Schilde, Uwe and Mayer, Matthew T. and Stojkovikj, Sasho and Roth, Christina and Taubert, Andreas (2020) Facile Synthesis of Hierarchical CuS and CuCo2S4 Structures from an Ionic Liquid Precursor for Electrocatalysis Applications. ACS Applied Materials & Interfaces, 12 (47). pp. 52560-52570. ISSN 1944-8252

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Abstract

Covellite-phase CuS and carrollite-phase CuCo2S4 nano- and microstructures were synthesized from tetrachloridometallate-based ionic liquid precursors using a novel, facile, and highly controllable hot-injection synthesis strategy. The synthesis parameters including reaction time and temperature were first optimized to produce CuS with a well-controlled and unique morphology, providing the best electrocatalytic activity toward the oxygen evolution reaction (OER). In an extension to this approach, the electrocatalytic activity was further improved by incorporating Co into the CuS synthesis method to yield CuCo2S4 microflowers. Both routes provide high microflower yields of >80 wt %. The CuCo2S4 microflowers exhibit a superior performance for the OER in alkaline medium compared to CuS. This is demonstrated by a lower onset potential (∼1.45 V vs RHE @10 mA/cm2), better durability, and higher turnover frequencies compared to bare CuS flowers or commercial Pt/C and IrO2 electrodes. Likely, this effect is associated with the presence of Co3+ sites on which a better adsorption of reactive species formed during the OER (e.g., OH, O, OOH, etc.) can be achieved, thus reducing the OER charge-transfer resistance, as indicated by X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy measurements.

Item Type:	Article
Impact Factor Value:	9.5
Subjects:	Engineering and Technology > Chemical engineering Natural sciences > Chemical sciences Natural sciences > Earth and related environmental sciences Engineering and Technology > Environmental engineering Engineering and Technology > Materials engineering
Divisions:	Faculty of Technology
Depositing User:	Saso Stojkovik
Date Deposited:	29 Feb 2024 09:08
Last Modified:	29 Feb 2024 09:08
URI:	https://eprints.ugd.edu.mk/id/eprint/33788

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