Tailored Interfacial Coupling in CoPi/PANI@Nickel-Cobalt Phosphide Heterostructure Electrocatalysts for Enhanced Hydrogen Evolution in Alkaline Media.

T T Karthika, Sarika Sasidharan, Anoop Ajaya Kumar Nair, Sheik Muhammmadhu Aboobakar Shibli, Anuj A Vargeese

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Article in ChemSusChem, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 authors.

T T KarthikaLaboratory for Energetic and Energy Materials Research (LEEMR), Department of Chemistry, National Institute of Technology Calicut, Kozhikode, India.

Sarika SasidharanCentre for Renewable Energy and Materials, University of Kerala, Kariavattom Campus, Thiruvananthapuram, India.

Anoop Ajaya Kumar NairSchool of Engineering and Natural Sciences (SENS), The Institute of Physical Sciences, Chemistry Division, University of Iceland, Reykjavik, Iceland.

Sheik Muhammmadhu Aboobakar ShibliCentre for Renewable Energy and Materials, University of Kerala, Kariavattom Campus, Thiruvananthapuram, India.

Anuj A VargeeseLaboratory for Energetic and Energy Materials Research (LEEMR), Department of Chemistry, National Institute of Technology Calicut, Kozhikode, India.ORCID https://orcid.org/0000-0003-2438-2472

Funding

Chief Minister's Navakerala Postdoctoral Fellowship, CMNPF GO(Rt) No. 606/2023/HEDNStudent Innovation Programme, SIP/NIT Calicut (2024-2025)

6 · The paper itself

Abstract

Interface engineering and electronic modulation are key strategies for developing efficient and durable electrocatalysts for sustainable hydrogen production. Herein, we report a hybrid electrocatalyst prepared by integrating cobalt phosphate (CoPi) and polyaniline (PANI) onto a nickel cobalt phosphide (NiCoP) matrix to enhance the alkaline hydrogen evolution reaction (HER). Co--N coordination was confirmed by XPS analysis, while density of states analysis revealed an upward shift in the Co d-band center from -1.11 to -1.03 eV following hybridization. This electronic modulation facilitated rapid charge transfer and strengthened interfacial electronic coupling, thereby accelerating HER kinetics through the conductive PANI framework. As a result, the CoPi/PANI@nickel-cobalt phosphide heterostructure delivers a low overpotential of 115 mV at 10 mA cm

Indexed as

binder‐free strategycharge transfer kineticsconducting polymerelectronic structure modulationoxygen vacancy

Identifiers

PMID42535739

DOI10.1002/cssc.70899

PMCPMC13426034

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