科研之友
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摘要
Metal-N-2 battery can be applied in both energy storage and electrochemical nitrogen reduction reaction (NRR); however, there has been only extraordinarily little study on metal-N-2 battery since its electrochemical reversibility still needs further proofs. And its electrochemical performances also need to be enhanced. Herein, we investigated the discharge-charge reactions between Li anode and N-2 cathode via designing an efficient catalyst of nanosized SnO2 particles dispersed on N-doped carbon nanosheets (SnO2@NC) for the Li-N-2 battery, with good cyclic stability and a high specific capacity of 0.25 mA h (similar to 500 mA h g(-1)) at a large current density of 1000 mA g(-1). The electrochemical reversibility of both NRR in the discharge process and nitrogen extraction reaction in the charge process for Li-N-2 battery is discussed. Time-of-flight secondary ion mass spectrometry results imply that the SnO2@NC can effectively promote the adsorption of N-2 and the activation of NRR in the discharge process. Furthermore, ex situ X-ray photoelectron spectroscopy and Fourier transform infrared tests are performed to study the electrochemical reversibility of Li-N-2 battery. It can be proved that the formation and decomposition of discharging product Li3N are electrochemical reversible during cycling in our deigned Li-N-2 battery system with SnO2@NC catalyst.
