Atomically dispersed Co-N4C2 catalytic sites for wide-temperature Na-Se batteries

被引:18
作者
Dong, Wen-Da [1 ]
Li, Yan [2 ]
Li, Chao-Fan [1 ,3 ]
Hu, Zhi-Yi [1 ,3 ]
Hsu, Liang-Ching [4 ]
Chen, Li-Hua [1 ]
Li, Yu [1 ]
Lei, Aiwen [2 ]
Su, Bao-Lian [1 ,5 ]
机构
[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, 122 Luoshi Rd, Wuhan 430070, Hubei, Peoples R China
[2] Wuhan Univ, Inst Adv Studies IAS, Coll Chem & Mol Sci, Wuhan, Hubei, Peoples R China
[3] Wuhan Univ Technol, Nanostruct Res Ctr NRC, 122 Luoshi Rd, Wuhan, Hubei, Peoples R China
[4] Natl Synchrotron Radiat Res Ctr, Hsinchu, Taiwan
[5] Univ Namur, Lab Inorgan Mat Chem CMI, 61 Rue Bruxelles, B-5000 Namur, Belgium
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
Over -coordinate SA catalyst; Cathode electrolyte interphase; Sodium ethylene mono -carbonate; Solid -phase Na-Se electrochemistry; Na-Se batteries; HIERARCHICAL POROUS CARBON; LI-SE; LITHIUM; SODIUM; NITROGEN; CONVERSION; REDUCTION; CATHODE; PHASES;
D O I
10.1016/j.nanoen.2022.108005
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
Sodium-selenium (Na-Se) batteries have been widely regarded as promising large-scale energy storage systems owing to the high volumetric energy density of 2530 W h L-1 and natural abundance of the element sodium. However, critical drawbacks including sluggish redox kinetics, severe volume variation and shuttle effect seri-ously deteriorate the electrochemical performance. Herein, we propose a precompetitive coordination strategy for over-coordinated single-atom catalyst, and subsequently synthesize the six-coordinated Co electrocatalyst supported carbon nanofibers (Co-N4C2) for solid-state conversion in wide-temperature Na-Se batteries. The Co-N4C2 catalyst can not only boost the redox kinetics of solid-phase Na2Se2/Na2Se, but also accelerate the elec-troreduction of ethylene carbonate to construct robust cathode electrolyte interphase, thereby inhibiting the irreversible phase transformation of active Se species. Furthermore, for the first time, the components of the cathode electrolyte interphase as sodium ethylene mono-carbonate are identified. Consequently, the as -synthesized free-standing Se@Co-N4C2 cathode with high Se-loading realizes high capacity, cycling stability and rate capability at both room temperature (20.0/40.0 degrees C) and low temperature (-11.7 degrees C).
引用
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页数:12
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