期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 45, 页码 42006-42013出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b11287
关键词
water splitting; iridium; perovskite; electrocatalysis; oxygen evolution reaction
资金
- National Key R&D Program of China [2017YFA0207800]
- National Natural Science Foundation of China (NSFC) [21771079, 21922507]
- Jilin Province Science and Technology Development Plan [20170101175JC, 20170101141JC]
- Program for JLU Science and Technology Innovative Research Team (JLUSTIRT)
- Fok Ying Tung Education Foundation [161011]
- NSFC [21673093, 21901083]
- Postdoctoral Innovative Talent Support Program [BX20180120]
- China Postdoctoral Science Foundation [2018M641771]
- Science and Technology Research Program of Education Department of Jilin Province [JJKH20190121KJ]
One of the key objectives in PEM electrolysis technology is to reduce iridium loading and to improve iridium mass activity at the side of oxygen evolution electrocatalysis. 6H-phase, Ir-based perovskite (6H-SrIrO3) is known to be a promising alternative to the IrO2 catalyst, and developing effective strategies to further enhance its catalytic performance is needed. Here we present that a significant enhancement in electrocatalytic activity for the oxygen evolution reaction of 6H-SrIrO3 can be achieved by cobalt incorporation. A suitable amount of cobalt dopants results in a decreased formation temperature of 6H-SrIrO3 from 700 to 500 degrees C and thereby a decreased thickness of platelike particles for the material. Besides the morphological effect, the cobalt incorporation also increases the coverage of surface hydroxyl groups, regulates the Ir-O bond covalency, and modulates the oxygen p-band center of the material. This synergistic optimization of the morphological, surface, and electronic structures makes the cobalt-doped 6H-SrIrO3 catalyst give a 3-fold increase in iridium mass activity for oxygen evolution reaction in comparison with the undoped 6H-SrIrO3 under acidic conditions.
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