Highly durable glycerol-mediated amorphous high-entropy VTi co-doped electrocatalyst with dynamic lattice oxygen activation for exceptional alkaline OER

Journal article

Authors/Editors

CHUTIMA KONGVARHODOM

Strategic Research Themes

Innovative Materials, Manufacturing and Construction (Strategic Research Themes)

Publication Details

Author list: Lee, P.-C.; Cheshideh, H.; Kongvarhodom, C.; Saukani, M.; Chen, H.-M.; Roubík, K.; Wu, Y.-F.; Lin, L.-Y.

Publisher: Elsevier

Publication year: 2025

Journal: International Journal of Hydrogen Energy (0360-3199)

Volume number: 189

Start page: 152157

ISBN: 80311393

ISSN: 0360-3199

eISSN: 1879-3487

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-105019489904&doi=10.1016%2Fj.ijhydene.2025.152157&partnerID=40&md5=20baf449edc551f299b2502a8c269c2b

Languages: English-Great Britain (EN-GB)

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Abstract

The design of robust and active electrocatalysts is integral for achieving efficient alkaline water splitting. In this work, we report on a glycerol-mediated amorphous high-entropy VTi co-doped electrocatalyst (VTiHEG-180), delivering exceptional performance toward oxygen evolution reaction (OER). Thermal engineering identifies 180 °C as the optimal synthesis temperature, producing uniform amorphous structures with high electrochemical surface area. Elemental engineering with V and Ti co-doping effectively regulates the local electronic environment and permits dynamic lattice oxygen activation, which is verified by X-ray photoelectron spectroscopy and electron paramagnetic resonance. The final VTiHEG-180 catalyst demonstrates a low overpotential of 295 mV at 50 mA/cm2, a small Tafel slope of 27 mV/dec, and stable performance at high anodic current densities for over 100 h in 1 M KOH, surpassing noble IrO2 benchmarks. The high oxidation states of Co3+ and Ni3+ are indicated to be active sites in this system. High-resolution transmission electron microscopy analysis reveals a faint outer layer facilitating ion access, while the high electrochemical surface area of 350.25 cm2 confirms optimal active site exposure. This study emphasizes how the combined effects of a high-entropy structure, elemental doping, and dynamic oxygen activation can provide a promising design strategy for advanced water splitting electrocatalysts. © 2025 Hydrogen Energy Publications LLC

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