Lattice engineering triggered phase formation of bimetallic thiospinels with excellent HzOR and OER activity for energy‑efficient hydrogen production

Raveendran, Diya and Mishra, Viplove and Praveen, Athma E. and Roy, Avishek and Basak, Ananda and Chandrasekar, Aditi and Mahalingam, Venkataramanan (2025) Lattice engineering triggered phase formation of bimetallic thiospinels with excellent HzOR and OER activity for energy‑efficient hydrogen production. ChemCatChem, 17 (6). ISSN 1867-3880

Full text not available from this repository.

Abstract

Introducing foreign elements into a crystal lattice could trigger phase transformation, serving as an excellent means to fabricate highly electrocatalytic phases. NiCo 2 S 4 is a notably electrocatalytic thiospinel phase, normally synthesized via a two‐step route and rarely explored for electrocatalytic hydrazine oxidation reaction (HzOR). This work reports one‐step hydrothermal synthesis of NiCo 2 S 4 and CuCo 2 S 4 and their performance for HzOR and oxygen evolution reaction (OER). Time dependent syntheses suggest formation of (M, Co) 9 S 8 ; M═Ni/Cu phase, followed by conversion to the respective thiospinel phase. Computational study validates that the incorporation of Ni into Co 9 S 8 disrupts its stability and induces the formation of a stable bimetallic thiospinel phase. Even without the assistance of metal foam substrate, NiCo 2 S 4 displayed remarkable activity for HzOR requiring potentials of 153 and 350 mV to afford current densities of 10 and 500 mA/cm 2 , respectively. Furthermore, NiCo 2 S 4 showed good activity for OER, providing 10 mA/cm 2 at 290 mV. For hydrazine‐assisted H 2 production, the two‐electrode setup, NiCo 2 S 4 ||Pt/C attained a current density of 10 mA/cm 2 at 140 mV, which is 1.39 V less than that required for conventional water electrolyzer (1.53 V). Long‐term durability of NiCo 2 S 4 for both HzOR and OER at high current densities highlights the suitability of the catalyst for practical applications.

Item Type:	Article
Authors:	Raveendran, Diya and Mishra, Viplove and Praveen, Athma E. and Roy, Avishek and Basak, Ananda and Chandrasekar, Aditi and Mahalingam, Venkataramanan
Document Language:	Language English
Subjects:	Natural Sciences Natural Sciences > Physics Natural Sciences > Chemistry & allied sciences
Divisions:	Azim Premji University - Bengaluru > School of Arts and Sciences
Full Text Status:	None
URI:	http://publications.azimpremjiuniversity.edu.in/id/eprint/6895
Publisher URL:	https://doi.org/10.1002/cctc.202401773

Actions (login required)

View Item