Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 39, Pages 19669-19673Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05384f
Keywords
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Funding
- NFSC [91227202, 51202086, 11404135]
- RFDP [20120061130006]
- Changbai Mountain scholars program [2013007]
- China Postdoctoral Science Foundation [2014M550171, 2014M561281]
- Graduate Innovation Fund of Jilin University [2015120]
- Jilin Provincial Science & Technology Development Program [20150520087JH]
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Iridium (Ir) is widely used as a catalyst in polymer electrolyte membrane water electrolyzers (PEMWEs). However, high cost and limited catalytic performance of Ir hamper its large-scale industrial application. Here, based on a modified galvanic replacement, we introduce Cu nanoparticles as a template to prepare single-crystalline Cu-Ir polyhedral nanocages (NCs). Alloying Ir with 3d transition metal Cu not only significantly reduces the loading of Ir but also remarkably enhances its catalytic activity by forming a unique NC structure and tuning the d-band structure of Ir. The as-prepared single-crystalline Cu1.11Ir NCs exhibit enhanced catalytic activity toward the oxygen evolution reaction (OER) in 0.05M H2SO4, with a smaller overpotential (286 mV) required for a current density of 10 mA cm(-2) and a Tafel slope of 43.8 mV per decade. The mass activity can reach 73 mA mg(Ir)(-1) at an overpotential of 0.28 V for Cu1.11Ir NCs. Hence, the obtained Cu1.11Ir NCs would be a promising electrocatalyst for practical electrocatalytic water splitting systems.
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