An ultrathin two-dimensional iridium-based perovskite oxide electrocatalyst with highly efficient {001} facets for acidic water oxidation

被引:11
|
作者
Lan Yang [1 ]
Kexin Zhang [1 ]
Hui Chen [1 ]
Lei Shi [1 ]
Xiao Liang [1 ]
Xiyang Wang [2 ]
Yipu Liu [1 ]
Qing Feng [3 ]
Mingjie Liu [4 ]
Xiaoxin Zou [1 ]
机构
[1] State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University
[2] Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University
[3] Northwest Institute for Non-ferrous Metal Research
[4] Department of Mechanical and Mechatronics Engineering, University of Waterloo
基金
中央高校基本科研业务费专项资金资助; 中国国家自然科学基金; 中国博士后科学基金; 国家重点研发计划;
关键词
D O I
暂无
中图分类号
O643.36 [催化剂];
学科分类号
081705 ;
摘要
The oxygen evolution reaction (OER) is an electrochemical bottleneck half-reaction in some important energy conversion systems (e.g., water splitting), which is traditionally mediated by iridium oxides in acidic environment. Perovskite-structured Ir-containing oxides (e.g., SrIrO) are a family of striking electrocatalysts due to their high specific activity, but this excellent quality is difficultly transferred to a nano-electrocatalyst with large active surface and good structural stability. Here, we present a synthesis method that produces a 2D ultrathin {001}-faceted SrIrOperovskite (2D-SIO) with a thickness of ~5 nm and high surface area (57.6 m~2g). We show that 2D-SIO can serve as a highly active and stable electrocatalytic nanomaterial for OER under acidic conditions. This perovskite nanomaterial produces 10 mA cmcurrent density at a low overpotential (η, 243 m V), and maintains its catalytic activity after 5000 continuous cyclic measurements. Besides ultrathin structure and large surface area, the exposed{001} facets are found to be the most crucial and unique structural factor for achieving high catalytic activity and structural stability. Our joint experimental and theoretical results demonstrate that these advantageous microstructural features of 2D-SIO endow it with a strong capability to generate the key O* intermediates, and thereby facilitate O–O bond formation and the OER.
引用
收藏
页码:619 / 627
页数:9
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