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Utilizing a Photocatalysis Process to Achieve a Cathode with Low Charging Overpotential and High Cycling Durability for a Li-O2 Battery |
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| Authors: | Dr Shengfu Tong Cuiping Luo Jiade Li Dr Zongwei Mei Prof Mingmei Wu Prof Anthony P O'Mullane Prof Huaiyong Zhu |
| Institution: | 1. School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082 P. R. China
School of Chemistry, MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, Sun Yat-sen University, Guangzhou, 510275 P. R. China School of Materials Science and Energy Engineering, Foshan University, Foshan, 528225 P. R. China These authors contributed equally to this work.;2. School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082 P. R. China School of Chemistry, MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, Sun Yat-sen University, Guangzhou, 510275 P. R. China Research Institute, Guangdong Brunp Recycling Technology Co.,Ltd., Foshan, Guangdong, 528100 P. R. China These authors contributed equally to this work.;3. School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082 P. R. China School of Chemistry, MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, Sun Yat-sen University, Guangzhou, 510275 P. R. China;4. School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen, 518055 P. R. China;5. School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082 P. R. China;6. School of Chemistry and Physics, Queensland University of Technology (QUT), Brisbane, QLD, 4001 Australia |
| Abstract: | The practical applications of non-aqueous lithium-oxygen batteries are impeded by large overpotentials and unsatisfactory cycling durability. Reported here is that commonly encountered fatal problems can be efficiently solved by using a carbon- and binder-free electrode of titanium coated with TiO2 nanotube arrays (TNAs) and gold nanoparticles (AuNPs). Ultraviolet irradiation of the TNAs generates positively charged holes, which efficiently decompose Li2O2 and Li2CO3 during recharging, thereby reducing the overpotential to one that is near the equilibrium potential for Li2O2 formation. The AuNPs promote Li2O2 formation, resulting in a large discharge capacity. The electrode exhibits excellent stability with about 100 % coulombic efficiency during continuous cycling of up to 200 cycles, which is due to the carbon- and binder-free composition. This work reveals a new strategy towards the development of highly efficient oxygen electrode materials for lithium-oxygen batteries. |
| Keywords: | gold batteries materials science nanoparticles photocatalysis |