Authors
Anamika Yadav, Trinh Hai Binh, Ayusie Goyal, Vaishnavi Varshney, Chung-Li Dong, Baghendra Singh, Apparao Draksharapu
Published in
Small (Weinheim an der Bergstrasse, Germany). Pages e76092. Oct 09, 2026. Epub Oct 09, 2026.
Abstract
The electronic properties of active M(O)OH catalysts can be effectively modified by tailoring the characteristics of their corresponding precatalysts. Herein, we report a coordination site-modulated precatalyst to access active catalysts for efficient electrocatalytic urea oxidation in an anion exchange membrane (AEM) electrolyzer. A two-dimensional NiFe-coordination polymer (NiFe-2D) was constructed via selective site engineering using hydrazine. Upon electrochemical reconstruction, NiFe-2D was transformed into an active Fe-Ni(O)OH catalyst (AC-2D). X-ray absorption spectroscopy (XAS) confirmed the changes in the coordination and electronic environment of AC-2D with a tuned spin state. Remarkably, AC-2D delivered a current density of 100 mA cm-2 at 1.50 V vs. RHE for the oxygen evolution reaction (OER) and 1.40 V vs. RHE for the urea oxidation reaction (UOR). AC-2D also delivered outstanding performance in an AEM electrolyzer, achieving a current of 4 A at 2.9 V cell voltage and maintaining operation for over 8 days for UOR-assisted water splitting. In situ electrochemical impedance spectroscopy (EIS) and kinetic analysis suggested facile charge transfer during OER and UOR in AC-2D. In situ Raman studies revealed that Ni4+ species were identified as the main active centers for OER, while Ni3+ species served as the catalytic sites for UOR.
PMID:
42852975
Bibliographic data and abstract were imported from PubMed on 09 Oct 2026.
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