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High-Performance K–CO2 Batteries Based on Metal-Free Carbon Electrocatalysts |
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| Authors: | Dr Wenchao Zhang Dr Chuangang Hu Prof Zaiping Guo Prof Liming Dai |
| Institution: | 1. Institute for Superconducting and Electronic Materials (ISEM), School of Mechanical, Materials, Mechatronics and Biomedical Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong, NSW, 2500 Australia
Center of Advanced Science and Engineering for Carbon (Case4Carbon), Department of Macromolecular Science and Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH, 44106 USA;2. Center of Advanced Science and Engineering for Carbon (Case4Carbon), Department of Macromolecular Science and Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH, 44106 USA The UNSW-CWRU International Joint Laboratory, School of Chemical Engineering, University of New South Wales, Sydney, Australia;3. Institute for Superconducting and Electronic Materials (ISEM), School of Mechanical, Materials, Mechatronics and Biomedical Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong, NSW, 2500 Australia;4. Center of Advanced Science and Engineering for Carbon (Case4Carbon), Department of Macromolecular Science and Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH, 44106 USA |
| Abstract: | Metal–CO2 batteries have attracted much attention owing to their high energy density and use of greenhouse CO2 waste as the energy source. However, the increasing cost of lithium and the low discharge potential of Na–CO2 batteries create obstacles for practical applications of Li/Na–CO2 batteries. Recently, earth-abundant potassium ions have attracted considerable interest as fast ionic charge carriers for electrochemical energy storage. Herein, we report the first K–CO2 battery with a carbon-based metal-free electrocatalyst. The battery shows a higher theoretical discharge potential (E⊖=2.48 V) than that of Na–CO2 batteries (E⊖=2.35 V) and can operate for more than 250 cycles (1500 h) with a cutoff capacity of 300 mA h g−1. Combined DFT calculations and experimental observations revealed a reaction mechanism involving the reversible formation and decomposition of P121/c1-type K2CO3 at the efficient carbon-based catalyst. |
| Keywords: | Batterien Kohlendioxid Kohlenstoffnanoröhren Elektrokatalyse Graphenoxid |