摘要
采用水热电沉积法在泡沫镍基体上原位沉积Co_9S_8薄膜,并对其形貌、组成、结构和电化学性能进行表征和测试。结果表明,镍基Co_9S_8薄膜呈花瓣片状,并具有优异的电化学性能,其在电流密度为10mA/cm~2时,比电容可高达2538.7 F/g。即使电流密度扩大至50 mA/cm~2时,比电容依然可达1930.7 F/g。经过1000次循环(电流密度为20 mA/cm2),比电容仍可达为1825.2 F/g,电容保有率72.8%,经过1500次循环后,电容保有率61.4%。
A Co_9S_8 film was in-situ deposited onto nickel foam substrate by a hydrothermal electrochemical deposition method.The morphology,composition and structure of the as-prepared film were characterized and the electrochemical performances were tested.The result show that the as-synthesized Co_9S_8 film displays a petal-like morphology and possesses excellent capacitive behavior with a specific capacitance of 2538.7 F/g at a discharge current density of 10 mA/cm~2,which remains to be 1930.7 F/g even at a higher density of 50mA/cm~2.After 1000 cycles at 20 mA/cm~2,a specific capacitance of 1825.2 F/g still remains,and the capacitance retention is calculated to be 72.8%.Even after 1500 cycles,a specific capacitance retention of 61.4%can be retained.
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