Facile construction of Mn2O3@NiMn LDH composites electrode with cube core-shell structures for high performance supercapacitors

Rechargeable zinc-air batteries (RZABs) are an ideal substitute for energy storage, but the short cycle longevity during long-term charge/discharge operation is one of the bottleneck factors that seriously restrict commercial application. Herein, the FeCo alloy/N, S co-doped carbon aerogel (NSCA/FeCo) were prepared as catalysts of cathode for RZABs. We investigated the polarization and impedance on long-term cycles during the battery operation to explore the attenuation mechanism. The results indicated that the roundtrip efficiency of batteries during charge/discharge cycles reduced fast initially and then slow. Besides, the comparative experiment was tested through the replacement of a new electrolyte and a zinc sheet. It is manifested that the failure of the battery is mainly due to the attenuation of the air cathode performance. Therefore, to further disclose the influencing factors and internal mechanisms of air cathode performance degradation, we conducted a series of characterization and testing, including the hydrophilicity, surface morphology, elemental composition, and electrochemical performance of three-electrode systems at different cycle times. This work not only provides a theoretical basis for deeply comprehending the attenuation mechanism of the cathode but also serves a reference for the material design and operating condition optimization of RZABs.

Intermittent investigations on attenuation mechanism of rechargeable zinc-air batteries during charge/discharge cycles.

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Facile Construction of Mn2o3@Nimn Ldh Composites Electrode with Cube Core-Shell Structures for High Performance Supercapacitors

A versatile electrolyte additive enabling highly reversible Zn anode in aqueous zinc-ion batteries

Electric-driven CO2 reduction offers a promising strategy for CO2 conversion into valuable chemicals and fuels. However, developing low cost and efficient catalysts is still a challenge. Although earth-abundant Zn with the capability of converting CO2 to CO is considered to be one of the promising materials, the low selectivity and stability of Zn catalyst limit its practical applications in CO2 reduction. Herein, we report a highly selective and stable layer-stacked Zn catalyst prepared by an efficient and facile electrochemical method for CO2 reduction to CO. The layer-stacked Zn can produce CO with more than 90% Faradaic efficiency at an overpotential of 0.9 V. Notably, the layer-stacked Zn maintained ∼90% CO selectivity in CO2 electrolysis for more than 70 h, which significantly surpasses the durability of the reported Zn-based catalysts to date. In addition, after prolonged CO2 reduction, the robust catalytic performance of layer-stacked Zn can be recovered repeatedly by the simple electrochemical method, which may be linked to the maintained layer-stacked structure even after multiple reactivations. Further analysis suggests that while abundant low-coordinated sites (corners and edges) can be created on layer-stacked Zn, the enhanced catalytic performance in CO2 reduction is mainly correlated with the created corners instead of edges, owing to that corners not only improve the intrinsic CO2 reduction activity but also inhibit H2 evolution simultaneously. 

Layer-Stacked Zn with Abundant Corners for Selective CO2 Electroreduction to CO

Zn-modified zeolites host for dendrite-free zinc metal anodes

Highly conductive manganese sesquioxide/Nitrogen-doped reduced graphene oxide composite for aqueous rechargeable zinc-ion batteries cathode

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Zn-modified zeolites host for dendrite-free zinc metal anodes

Highly conductive manganese sesquioxide/Nitrogen-doped reduced graphene oxide composite for aqueous rechargeable zinc-ion batteries cathode