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A molten-salt Na–O 2 battery featuring a liquid Na negative electrode and Ni positive electrode was found to form Na 2 O 2 on discharge, enabled by nitrate redox where NO 3 − is reduced to Na 2 O and NO 2 − , then reactions with O 2 produce Na 2 O 2 and reform NO 3 − .
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Zhu et al. (2022) studied this question.
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