Nanovoid Incorporated IrxCu Metallic Aerogels for Oxygen Evolution Reaction Catalysis

被引:149
作者
Shi, Qiurong [1 ]
Zhu, Chengzhou [1 ,2 ,3 ]
Zhong, Hong [1 ]
Su, Dong [4 ]
Li, Na [4 ]
Engelhard, Mark H. [5 ]
Xia, Haibing [6 ]
Zhang, Qiang [7 ]
Peng, Shuo [1 ]
Beckman, Scott P. [1 ]
Du, Dan [1 ,2 ,3 ]
Lin, Yuehe [1 ]
机构
[1] Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA
[2] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ PR China, Wuhan 430079, Hubei, Peoples R China
[3] Cent China Normal Univ, Coll Chem, Wuhan 430079, Hubei, Peoples R China
[4] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA
[5] Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA
[6] Shandong Univ, Key Inst Crystal Mat, Jinan 250100, Shandong, Peoples R China
[7] Washington State Univ, Dept Chem, Pullman, WA 99164 USA
来源
ACS ENERGY LETTERS | 2018年 / 3卷 / 09期
关键词
OXIDATION ELECTROCATALYSTS; PH RANGE; EFFICIENT; REDUCTION; IRIDIUM; DESIGN;
D O I
10.1021/acsenergylett.8b01338
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ir-based nanomaterials are regarded as state-of-the-art cathode electrocatalysts in proton exchange membrane water electrolyzers (PEMWEs). Engineering the morphology of Ir-based three-dimensional architectures as electrocatalysts toward oxygen evolution reaction (OER) has been rarely studied. Here, we report the gelation of IrxCu metallic hydrogels self-assembled with ultrafine and nanovoid incorporated building blocks for enhancing the electrocatalytic performance toward OER. The composition-optimized Ir3Cu metallic aerogels exhibited improved catalytic activity and durability toward OER. The mesosized voids generated through the in situ galvanic replacement reaction and the macrosized porous systems make a great contribution to the increased number of active sites. First-principle calculations revealed the intrinsic optimized binding energy of Ir by alloying with Cu. The best catalytic performance necessities a balance of the adsorption and desorption energy. The well-defined morphology and enhanced OER electrochemical performances of nanovoid incorporated IrxCu metallic aerogels hold great promise in further applications in PEMWEs.
引用
收藏
页码:2038 / 2044
页数:13
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