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Low-Cost MnO2 Nanoflowers and La2O3 Nanospheres as Efficient Electrodes for Asymmetric Supercapacitors
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-11-10 , DOI: 10.1021/acs.energyfuels.0c02508
Chengxiang Sun 1, 2 , Wenxia Pan 1 , Dianyuan Zheng 2, 3 , Rongbin Yao 2 , Yuhang Zheng 4 , Jianhong Zhu 1 , Daiwen Jia 5
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-11-10 , DOI: 10.1021/acs.energyfuels.0c02508
Chengxiang Sun 1, 2 , Wenxia Pan 1 , Dianyuan Zheng 2, 3 , Rongbin Yao 2 , Yuhang Zheng 4 , Jianhong Zhu 1 , Daiwen Jia 5
Affiliation
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While supercapacitors can deliver high electrical power, their low energy density limits their application. Here, we designed and fabricated a facile asymmetric supercapacitor (ASC) with excellent electrochemical performance, where MnO2 nanoflowers (NFs) and La2O3 nanospheres (NSs) were successfully electrodeposited onto carbon paper as work electrodes in an aqueous 0.5 M Na2SO4 electrolyte. Such nanostructures endow the electrodes with short electrons, ion diffusion paths, and abundant charge adsorption sites. The assembled MnO2 NF//La2O3 NS asymmetric cell presents a gravimetric energy density of 80.56 Wh kg–1, a volumetric energy density of 0.74 mWh cm–3 at 35.71 mA cm–3, and excellent cycle performance. Moreover, a packaged device displays a superior energy density of 0.49 mWh cm–3 with a power density of 94.29 mW cm–3. The satisfactory improvement in performance mainly stems from the homogeneous nanostructured architecture and an extended workable potential region of 0–2.0 V. The resulting supercapacitors could have great potential for designing high energy and power density devices as effective power sources.
中文翻译:
低成本MnO 2纳米花和La 2 O 3纳米球作为不对称超级电容器的高效电极
尽管超级电容器可以提供高功率,但其低能量密度限制了它们的应用。在这里,我们设计并制造了一种具有出色电化学性能的不对称超级电容器(ASC),其中将MnO 2纳米花(NFs)和La 2 O 3纳米球(NSs)成功地电沉积在碳纸上作为工作电极在0.5 M Na 2水溶液中SO 4电解质。这种纳米结构使电极具有短的电子,离子扩散路径和丰富的电荷吸附位点。组装的MnO 2 NF // La 2 O 3 NS不对称电池的重量能量密度为80.56 Wh kg –1,0.74 mWh的厘米的体积能量密度-3在35.71毫安厘米-3,和优异的循环性能。此外,封装的设备显示出0.49 mWh cm -3的出色能量密度和94.29 mW cm -3的功率密度。性能上令人满意的提高主要来自于均匀的纳米结构和0-2.0 V的可扩展工作电势区域。由此产生的超级电容器可能具有将高能量和功率密度器件设计为有效电源的巨大潜力。
更新日期:2020-11-19
中文翻译:
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低成本MnO 2纳米花和La 2 O 3纳米球作为不对称超级电容器的高效电极
尽管超级电容器可以提供高功率,但其低能量密度限制了它们的应用。在这里,我们设计并制造了一种具有出色电化学性能的不对称超级电容器(ASC),其中将MnO 2纳米花(NFs)和La 2 O 3纳米球(NSs)成功地电沉积在碳纸上作为工作电极在0.5 M Na 2水溶液中SO 4电解质。这种纳米结构使电极具有短的电子,离子扩散路径和丰富的电荷吸附位点。组装的MnO 2 NF // La 2 O 3 NS不对称电池的重量能量密度为80.56 Wh kg –1,0.74 mWh的厘米的体积能量密度-3在35.71毫安厘米-3,和优异的循环性能。此外,封装的设备显示出0.49 mWh cm -3的出色能量密度和94.29 mW cm -3的功率密度。性能上令人满意的提高主要来自于均匀的纳米结构和0-2.0 V的可扩展工作电势区域。由此产生的超级电容器可能具有将高能量和功率密度器件设计为有效电源的巨大潜力。