期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 2, 页码 742-746出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201507626
关键词
electrocatalysts; iridium; oxygen evolution reactions; proton exchange membranes
资金
- German Federal Ministry for Economic Affairs and Energy (BMWi) [0325440A]
We have developed a highly active nanostructured iridium catalyst for anodes of proton exchange membrane (PEM) electrolysis. Clusters of nanosized crystallites are obtained by reducing surfactant-stabilized IrCl3 in water-free conditions. The catalyst shows a five-fold higher activity towards oxygen evolution reaction (OER) than commercial Ir-black. The improved kinetics of the catalyst are reflected in the high performance of the PEM electrolyzer (1 mg(Ir)cm(-2)), showing an unparalleled low overpotential and negligible degradation. Our results demonstrate that this enhancement cannot be only attributed to increased surface area, but rather to the ligand effect and low coordinate sites resulting in a high turnover frequency (TOF). The catalyst developed herein sets a benchmark and a strategy for the development of ultra-low loading catalyst layers for PEM electrolysis.
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