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Vapour phase conversion of metal oxalates to metal phosphide nanostructures and their use as anode in rechargeable Li, Na and K-ion batteries

Publication Type : Journal Article

Thematic Areas : Nanosciences and Molecular Medicine

Publisher : Electrochimica Acta.

Source : Electrochimica Acta, Volume 388, p.138643 (2021)

Url : https://www.sciencedirect.com/science/article/pii/S0013468621009336

Keywords : Anode, K-ion batteries, Li-ion, Metal phosphides, Na-ion, Vapour phase conversion

Campus : Amritapuri, Kochi

School : Center for Nanosciences

Center : Amrita Center for Nanosciences and Molecular Medicine Move

Department : Nanosciences and Molecular Medicine

Year : 2021

Abstract : We report a simple, vapour-phase conversion of two prominent metal oxalates into metal phosphide nanostructures (CoP and FeP) and their application in three alkali ion batteries (Li, Na and K). This method was a low temperature, scalable, single step conversion process using metal oxalates and sodium hypophosphite as originators. Apart from the vapour phase conversion reaction mechanism, structural, morphological, surface chemical, thermo-gravimetric and surface area analysis of these metal phosphides were also carried out. The metal phosphides was imaged using transmission electron microscopy which revealed a macroporous sheet like morphology for CoP and a mesoporous frame work for FeP particles which was further confirmed by BET. CoP and FeP nanostructures delivered reversible specific capacity of 265 and 360 mAh/g respectively for lithium ion battery at a current density of 250 mA/g for 500 cycles. For sodium ion battery, at a current density of 100 mA/g, CoP and FeP exhibited a specific capacity of 122 and 216 mAh/g respectively. For potassium ion battery, CoP and FeP exhibited a specific capacity of 73 and 113 mAh/g for 100 cycles. The alkali ion storage performances correlated well with their physicochemical and electrochemical properties while the surface and bulk storage contributions were also explored.

Cite this Research Publication : Aswathy S. Murali, Dona Susan Baji, Shantikumar V Nair, and Dr. Dhamodaran Santhanagopalan, “Vapour phase conversion of metal oxalates to metal phosphide nanostructures and their use as anode in rechargeable Li, Na and K-ion batteries”, Electrochimica Acta, vol. 388, p. 138643, 2021.

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