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MnO2 Nanoflowers Deposited on Graphene Paper as Electrode Materials for Supercapacitors
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-06-11 00:00:00 , DOI: 10.1021/acsanm.9b00797
Omer Sadak 1 , Weizheng Wang 2 , Jiehao Guan 2 , Ashok K. Sundramoorthy 3 , Sundaram Gunasekaran 1, 2
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-06-11 00:00:00 , DOI: 10.1021/acsanm.9b00797
Omer Sadak 1 , Weizheng Wang 2 , Jiehao Guan 2 , Ashok K. Sundramoorthy 3 , Sundaram Gunasekaran 1, 2
Affiliation
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We recently reported a simple and cost-effective green method to produce free-standing, flexible, and highly conductive electrochemically exfoliated graphene paper (GrP) for a supercapacitor application. To improve the capacitance behavior of GrP, manganese dioxide (MnO2) was electrochemically deposited on GrP with different number of MnO2 cycles. After the electrochemical deposition process, MnO2 nanoflowers were formed, which provide a fast transfer of electrolyte ions. After 10 cycles of electrodeposition, MnO2-coated GrP (GrP/10-MnO2, which is the optimal composition) exhibited an excellent capacitive performance with a high specific capacitance of 385.2 F·g–1 at 1 mV·s–1 in 0.1 M Na2SO4 electrolyte and outstanding capacitance retention after 5000 consecutive cycles. Taking advantage of both superior mechanical and capacitance behavior of GrP and GrP/10-MnO2 electrodes, a flexible solid-state asymmetric supercapacitor (SASc) device was assembled using GrP/10-MnO2 and GrP as positive and negative electrode, respectively. The fabricated SASc device exhibited not only high areal capacitances of 76.8 mF cm–2 at a current density of 0.05 mA cm–2 but also excellent cycling stability of 82.2% after 5000 consecutive galvanostatic charge/discharge cycles. This flexible supercapacitor can also deliver a high energy density of 6.14 mWh·cm–2 with a power density of 36 mW·cm–2. This research represents a new direction for exploring the potential of free-standing GrP and its nanocomposites in flexible energy-storage systems.
中文翻译:
MnO 2纳米花沉积在石墨烯纸上作为超级电容器的电极材料
我们最近报道了一种简单且具有成本效益的绿色方法,可生产用于超级电容器应用的独立式,柔性,高导电性电化学剥落石墨烯纸(GrP)。为了改善GrP的电容性能,以不同的MnO 2循环次数将二氧化锰(MnO 2)电化学沉积在GrP上。在电化学沉积过程之后,形成了MnO 2纳米花,它可以快速转移电解质离子。经过10次电沉积循环后,涂有MnO 2的GrP(GrP / 10-MnO 2是最佳组成)表现出优异的电容性能,在1 mV·s时具有385.2 F·g –1的高比电容。在0.1 M Na 2 SO 4电解液中为–1,在连续5000次循环后具有出色的电容保持率。利用GrP和GrP / 10-MnO 2电极优异的机械性能和电容性能,分别使用GrP / 10-MnO 2和GrP作为正极和负极组装了柔性固态不对称超级电容器(SASc)器件。所制造的SASc器件不仅在0.05 mA cm -2的电流密度下显示出76.8 mF cm -2的高面积电容,而且在连续5000次恒电流充/放电循环后还具有82.2%的出色循环稳定性。这种灵活的超级电容器还可以提供6.14 mWh·cm的高能量密度–2的功率密度为36 mW·cm –2。这项研究为探索独立式GrP及其纳米复合材料在柔性储能系统中的潜力提供了新的方向。
更新日期:2019-06-11
中文翻译:
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MnO 2纳米花沉积在石墨烯纸上作为超级电容器的电极材料
我们最近报道了一种简单且具有成本效益的绿色方法,可生产用于超级电容器应用的独立式,柔性,高导电性电化学剥落石墨烯纸(GrP)。为了改善GrP的电容性能,以不同的MnO 2循环次数将二氧化锰(MnO 2)电化学沉积在GrP上。在电化学沉积过程之后,形成了MnO 2纳米花,它可以快速转移电解质离子。经过10次电沉积循环后,涂有MnO 2的GrP(GrP / 10-MnO 2是最佳组成)表现出优异的电容性能,在1 mV·s时具有385.2 F·g –1的高比电容。在0.1 M Na 2 SO 4电解液中为–1,在连续5000次循环后具有出色的电容保持率。利用GrP和GrP / 10-MnO 2电极优异的机械性能和电容性能,分别使用GrP / 10-MnO 2和GrP作为正极和负极组装了柔性固态不对称超级电容器(SASc)器件。所制造的SASc器件不仅在0.05 mA cm -2的电流密度下显示出76.8 mF cm -2的高面积电容,而且在连续5000次恒电流充/放电循环后还具有82.2%的出色循环稳定性。这种灵活的超级电容器还可以提供6.14 mWh·cm的高能量密度–2的功率密度为36 mW·cm –2。这项研究为探索独立式GrP及其纳米复合材料在柔性储能系统中的潜力提供了新的方向。