Sun C, Qin J, Li M, Han G, Song Y. Ultrafine IrRu Nanoparticles toward Efficient Oxygen Evolution Reaction in Acidic Media.
Inorg Chem 2022;
61:17362-17369. [PMID:
36264684 DOI:
10.1021/acs.inorgchem.2c03101]
[Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Proton exchange membrane water electrolyzers (PEMWEs) are capable of mass-producing green hydrogen with renewable and wave-trough electricity, but confront the challenge of the lack of advanced electrocatalysts to accelerate sluggish oxygen evolution reaction (OER). Herein, we report the synthesis of ultrafine IrRu alloy nanoparticles (1.6 ± 0.3 nm) by coprecipitation of IrCl3, RuCl3, and HCOONa in water to allow Ir3+ and Ru3+ to be well dispersed and enclosed in the matrix of crystalline HCOONa, followed by heat treatment of HCOONa to reduce Ir3+ and Ru3+. Remarkably, the overpotential of IrRu toward acidic OER at 10 mA cm-2 is merely 230 and 194 mV at 51 and 204 μgIrRu cm-2, respectively. The high electrochemically active surface area (ECSA) of 577.1 m2 g-1 and high specific activity (SA) of 22.7 μA cm-2 at 1.45 V vs RHE would contribute to the exceptional OER activity. In addition, the electron transfer from Ir to Ru in IrRu should significantly boost the OER activity according to X-ray photoelectron spectroscopy (XPS). IrRu also shows an excellent stability during 10 h of a chronopotentiometry (CP) test at 10 mA cm-2. Eventually, the high OER activity of IrRu was verified in a PEMWE.
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