Authors
Hanya Ye, Qing Zhang, Cong Liu, Xiaoqian Zang, Muhammad Nadeem, Qiaoliang Bao, Yoshio Bando, Ding Yuan, Yuhai Dou
Published in
Small (Weinheim an der Bergstrasse, Germany). Pages e76082. Oct 04, 2026. Epub Oct 04, 2026.
Abstract
The sluggish kinetics of the oxygen evolution reaction (OER) impede efficient water electrolysis, motivating the development of robust, non-precious-metal electrocatalysts. Here, we construct a self-supported bimetallic metal-organic framework precatalyst (PAx-NiCo-BDC) through a two-step strategy using phytic acid (PA) for mild etching and multidentate coordination. This treatment introduces oxygen-vacancy-related coordination defects and regulates the precursor morphology. The optimized PA3-NiCo-BDC requires only 212 mV to reach 10 mA cm- 2, exhibits a Tafel slope of 20.2 mV dec- 1, and shows excellent durability, outperforming commercial RuO2. An anion-exchange-membrane water electrolyzer employing PA3-NiCo-BDC delivers 1 A cm- 2 at 1.72 V and operates stably for 300 h. In situ Raman spectroscopy reveals that PA-induced defects enable the lower-potential formation of Ni3+-O-containing NiOOH-like surface species. Differential electrochemical mass spectrometry identifies the adsorbate evolution mechanism as the dominant OER pathway. Density functional theory calculations further show that defect-induced d-band-center modulation optimizes the adsorption and desorption of OER intermediates at Ni sites and lowers the OER energy barrier. This green coordination-engineering strategy provides a versatile route to efficient and durable MOF-based electrodes for practical water electrolysis.
PMID:
42829872
Bibliographic data and abstract were imported from PubMed on 04 Oct 2026.
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