在这项工作中,我们采用简单的水热方法在泡沫镍基底上生长了钴酸镍纳米片。结果表明,合成的NiCo2O4纳米片直接用作超级电容器电极,呈现出优异的电化学性能。在电流密度为1 m A·cm^-2时,其面积比电容达到1.26 C·cm^-2;经过1000...在这项工作中,我们采用简单的水热方法在泡沫镍基底上生长了钴酸镍纳米片。结果表明,合成的NiCo2O4纳米片直接用作超级电容器电极,呈现出优异的电化学性能。在电流密度为1 m A·cm^-2时,其面积比电容达到1.26 C·cm^-2;经过10000次充放电循环后,其比电容仍能保持初始容量的97.6%。以NiCo2O4纳米片为正极,活性炭为负极组装的超级电容器在功率密度为1.56和4.5 W·cm^-3时,其能量密度分别达到0.14和0.09 Wh·cm^-3。经过10000次循环后,器件仍能保持初始比电容的95%。以上结果证明合成的钴酸镍纳米片电极在未来的储能器件中具有良好的电化学应用前景。展开更多
Non-noble-metal electrode materials with high durability and efficiency have become the frontiers of energy conversion and storage fields.However,conventional electrode materials often show high overpotential and low ...Non-noble-metal electrode materials with high durability and efficiency have become the frontiers of energy conversion and storage fields.However,conventional electrode materials often show high overpotential and low conductivity.To solve this problem,we fabricate a NiMoxCo2−x layered double hydroxide(LDH)/Ni foam(NF)product through a facile hydrothermal route.The as-prepared NiMo-Co-LDH/NF catalyst possesses an overpotential of 123 mV for hydrogen evolution reaction(HER)at 10 mA cm^−2 and 279 mV for oxygen evolution reaction(OER)at 20 mA cm^−2.The as obtained product exhibits excellent overall water splitting performances.Meanwhile,as the electrode material for supercapacitor,it delivers high specific capacitance and excellent cyclic performance.The asymmetric supercapacitor assembled with NiMoCo-LDH/NF//active carbon exhibits 93%of its initial capacity after 8000 cycles.展开更多
基金Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology(191010-K)the Education Department Funding of Liaoning Province(LJGD2019001)the Funding of Science and Technology Bureau,Shenyang City(RC190138)。
文摘Non-noble-metal electrode materials with high durability and efficiency have become the frontiers of energy conversion and storage fields.However,conventional electrode materials often show high overpotential and low conductivity.To solve this problem,we fabricate a NiMoxCo2−x layered double hydroxide(LDH)/Ni foam(NF)product through a facile hydrothermal route.The as-prepared NiMo-Co-LDH/NF catalyst possesses an overpotential of 123 mV for hydrogen evolution reaction(HER)at 10 mA cm^−2 and 279 mV for oxygen evolution reaction(OER)at 20 mA cm^−2.The as obtained product exhibits excellent overall water splitting performances.Meanwhile,as the electrode material for supercapacitor,it delivers high specific capacitance and excellent cyclic performance.The asymmetric supercapacitor assembled with NiMoCo-LDH/NF//active carbon exhibits 93%of its initial capacity after 8000 cycles.
