Santosh, M. S. and Kumari, Sandhyawasini and Tripathy, Amrita (2025) Interfacial engineering of CuSe2/FeSe2 heterojunctions for water splitting: a pathway to high-performance hydrogen and oxygen evolution reactions. Nanoscale, 47.

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Abstract

The efficiency of green hydrogen production via water electrolysis is critically constrained by high energy barriers, particularly during the oxygen evolution reaction (OER). In this study, CuSe2 /FeSe2 heterojunctions are introduced as cost-effective and highly active bifunctional electrocatalysts for overall water split- ting. Leveraging the abundant and tunable properties of Cu- and Fe-based chalcogenides, this work demonstrates how charge redistribution and interfacial electronic coupling in the heterostructure significantly enhance catalytic activity. High surface area CuSe2/FeSe2 heterojunctions enhance hydrogen and oxygen adsorption and accelerate charge transfer, achieving low overpotentials (666 mV for the HER and 490 mV for the OER at 10 mA cm−2 ), a high OER current density (135 mA cm−2), and a reduced Tafel slope (137 mV dec−1). The catalyst maintained stable performance over 24 hours of continuous operation at 10 mA cm−2 , confirming its structural robustness and practical viability. These findings position CuSe2/ FeSe2 heterojunctions as promising candidates for scalable, sustainable hydrogen production and advanced electrochemical energy technologies

Item Type:	Article
Subjects:	Coal Preparation
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	08 Aug 2025 09:29
Last Modified:	08 Aug 2025 09:29
URI:	http://cimfr.csircentral.net/id/eprint/2850

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