Tuning of lattice oxygen reactivity and scaling relation to construct better oxygen evolution electrocatalyst

被引:335
作者
Huang, Zhen-Feng [1 ,2 ]
Xi, Shibo [3 ]
Song, Jiajia [4 ,5 ]
Dou, Shuo [1 ]
Li, Xiaogang [1 ]
Du, Yonghua [3 ,7 ]
Diao, Caozheng [6 ]
Xu, Zhichuan J. [4 ]
Wang, Xin [1 ]
机构
[1] Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore, Singapore
[2] Tianjin Univ, Key Lab Green Chem Technol, Minist Educ, Sch Chem Engn & Technol, Tianjin, Peoples R China
[3] ASTAR, Inst Chem & Engn Sci, Singapore, Singapore
[4] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore, Singapore
[5] Tianjin Univ, Inst Mol Aggregat Sci, Tianjin, Peoples R China
[6] Natl Univ Singapore, Singapore Synchrotron Light Source, Singapore, Singapore
[7] Brookhaven Natl Lab, Natl Synchrotron Light Source II, Upton, NY 11973 USA
基金
国家重点研发计划; 中国国家自然科学基金; 新加坡国家研究基金会;
关键词
ANIONIC REDOX ACTIVITY; ELASTIC BAND METHOD; METAL-OXIDES; DESIGN; STABILITY; CATALYSIS; PH;
D O I
10.1038/s41467-021-24182-w
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Developing efficient and low-cost electrocatalysts for oxygen evolution reaction is crucial in realizing practical energy systems for sustainable fuel production and energy storage from renewable energy sources. However, the inherent linear scaling relation for most catalytic materials imposes a theoretical overpotential ceiling, limiting the development of efficient electrocatalysts. Herein, using modeled NaxMn3O7 materials, we report an effective strategy to construct better oxygen evolution electrocatalyst through tuning both lattice oxygen reactivity and scaling relation via alkali metal ion mediation. Specifically, the number of Na+ is linked with lattice oxygen reactivity, which is determined by the number of oxygen hole in oxygen lone-pair states formed by native Mn vacancies, governing the barrier symmetry between O-H bond cleavage and O-O bond formation. On the other hand, the presence of Na+ could have specific noncovalent interaction with pendant oxygen in *OOH to overcome the limitation from linear scaling relation, reducing the overpotential ceiling. Combining in situ spectroscopy-based characterization with first-principles calculations, we demonstrate that an intermediate level of Na+ mediation (NaMn3O7) exhibits the optimum oxygen evolution activity. This work provides a new rational recipe to develop highly efficient catalyst towards water oxidation or other oxidative reactions through tuning lattice oxygen reactivity and scaling relation. While water-splitting provides a renewable means to generate fuel, the water-oxidation half-reaction is considered a bottleneck process. Here, authors tune lattice oxygen reactivity and scaling relations via alkali metal ion mediation in NaMn3O7 for oxygen evolution electrocatalysis.
引用
收藏
页数:9
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