泡沫镍负载NiCoP@MnCo-OH正极的制备及电化学性能

Preparation of nickel foam-loaded NiCoP@MnCo-OH cathode and its electrochemical performance

采用水热磷化再水热的多步反应制备了泡沫镍(NF)负载的镍钴磷化物表面包覆锰钴氢氧化物的核壳结构纳米线阵列复合材料电极(NiCoP@MnCo-OH/NF),并对其结构、形貌以及作为碱性储能器件正极的电化学性能进行了表征.结果表明,在碱性电解液中,该电极在0.3 A/g电流密度下的放电比容量高达477.6 mAh/g,在10.0 A/g高电流密度下也可达270.0 mAh/g,远优于NiCoP/NF和MnCo-OH/NF电极.在10.0 A/g下经8000次充放电循环后,容量保持率为69.2%.优异的电化学性能归因于NiCoP和MnCo-OH良好的导电性、独特的纳米线核壳异质结构及复合物中两组分间的协同作用.

A nickel foam(NF)-loaded core-shell-structured nanowire array composite electrode(NiCoP@MnCo-OH/NF)consisting of nickel cobalt phosphide coated with manganese cobalt hydroxide is prepared via hydrothermalphosphidation-hydrothermal procedure,and its structure,morphology and electrochemical performance as a cathode for alkaline energy sto-rage devices are characterized.The experimental results show that the discharge specific capacity of the electrode is high up to 477.6 mAh/g at the current density of 0.3 A/g and remains 270.0 mAh/g at the high current density of 10.0 A/g,which are far superior to those of the NiCoP/NF and MnCo-OH/NF electrodes.After 8000 cycles at 10.0 A/g,the capacity retention rate is 69.2%.The excellent electrochemical performance is attributed to the good electrical conduction of the NiCoP and MnCo-OH as well as the unique nanowire coreshell heterostructure and the synergy between the two components of the composite.