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Title: Iridium Incorporation into MnO2 for an Enhanced Electrocatalytic Oxygen Evolution Reaction

Journal Article · · ChemCatChem

Abstract We have investigated the structure and activity of electrocatalysts for the oxygen evolution reaction (OER) that had low loadings of Ir incorporated into the 2D layered MnO 2 , (birnessite, nominally δ‐MnO 2 ) and the 3D MnO 2 (pyrolusite, β‐MnO 2 ). The Ir‐incorporated β‐MnO 2 (Ir/β‐MnO 2 ) electrocatalysts were prepared for the first time via a thermally induced phase transition of δ‐MnO 2 containing 16–22 wt% Ir. This phase transition of δ‐MnO 2 to β‐MnO 2 was facilitated by the presence of Ir in the structure, as both Ir in IrO 2 and Mn in β‐MnO 2 could adopt a thermodynamically favored rutile structure. Extended X‐ray absorption fine structure (EXAFS) of Ir/β‐MnO 2 showed that the catalyst consisted of Ir substituted into the crystalline β‐MnO 2 lattice. 22 wt% Ir/β‐MnO 2 (60  ) exhibited an OER overpotential ( ) of 337 mV, lower than the for commercial IrO 2 . This was constant for 6 h, at 10 mA  in 0.5 M H 2 SO 4 . EXAFS, high‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) and X‐ray absorption near edge structure (XANES) showed that 22 wt% Ir/β‐MnO 2 had a strained structure containing ∼41 % Mn 3+ , an OER active species, along with a modified Ir bond covalency consisting of both Ir−O−Ir and Ir−O−Mn.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; AC02-06CH11357
OSTI ID:
1975239
Alternate ID(s):
OSTI ID: 1971281
Report Number(s):
BNL-224444-2023-JAAM; TRN: US2314050
Journal Information:
ChemCatChem, Vol. 15, Issue 8; ISSN 1867-3880
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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