期刊
ACS CATALYSIS
卷 7, 期 4, 页码 2346-2352出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b03246
关键词
electrocatalysis; oxygen evolution reaction; water splitting; iridium oxide; operando X-ray absorption spectroscopy
资金
- CCEM Switzerland
- Umicore GmbH Co KG
- Swiss Electric Research
- Swiss Federal Office of Energy, CTI
- Swiss Competence Center for Energy Research (SCCER) Heat & Electricity Storage
The utilization and development of efficient water electrolyzers for hydrogen production is currently limited due to the sluggish kinetics of the anodic process-the oxygen evolution reaction (OER). Moreover, state of the art OER catalysts contain high amounts of expensive and low abundance noble metals such as Ru and Ir, limiting their large-scale industrial utilization. Therefore, the development of low-cost, highly active, and stable OER catalysts is a key requirement toward the implementation of a hydrogen-based economy. We have developed a synthetic approach to high surface-area chlorine-free iridium oxide nanoparticles dispersed in titania (IrO2-TiO2), which is a highly active and stable OER catalyst in acidic media. IrO2-TiO2 was prepared in one step in molten NaNO3 (Adams fusion method) and consists of ca. 1-2 nm IrO2 particles distributed in a matrix of titania nanoparticles with an overall surface area of 245 m(2) g(-1). This material contains 40 mol(M) % of iridium and demonstrates improved OER activity and stability in comparison to the commercial benchmark catalyst and state of the art high-surface-area IrO2. Ex situ characterization of the catalyst indicates the presence of iridium hydroxo surface species, which were previously associated with the high OER activity. Operando X-ray absorption studies demonstrate the evolution of the surface species as a function of the applied potential, suggesting the conversion of the initial hydroxo surface layer to the oxo-terminated surface via anodic oxidation (OER regime).
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