期刊
CHEMELECTROCHEM
卷 2, 期 3, 页码 328-332出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201402344
关键词
electrochemistry; energy storage; green chemistry; seawater cathode material; sodium
资金
- Creativity and Innovation Project Fund of Ulsan National Institute of Science and Technology (UNIST) [1,140009,01]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2014R1A1A2A16053515]
- C-ITRC (Convergence Information Technology Research Center) support program [NIPA-2013-H0301-13-1009]
- Department of Energy [DE-AC02-06CH11357]
Herein, we explore the electrochemical mechanism of a novel rechargeable seawater battery system that uses seawater as the cathode material. Sodium is harvested from seawater while charging the battery, and the harvested sodium is discharged with oxygen dissolved in the seawater, functioning as oxidants to produce electricity. The seawater provides both anode (Na metal) and cathode (O-2) materials for the proposed battery. Based on the discharge voltage (-2.9 V) with participation of O-2 and the charge voltage (similar to 4.1 V) with Cl-2 evolution during the first cycle, a voltage efficiency of about 73% is obtained. If the seawater battery is constructed using hard carbon as the anode and a Na super ion conductor as the solid electrolyte, a strong cycle performance of 84% is observed after 40 cycles.
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