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Charge storage performances and mechanisms of MnO2 nanospheres, nanorods, nanotubes and nanosheets
Nanoscale ( IF 5.8 ) Pub Date : 2017-08-18 00:00:00 , DOI: 10.1039/c7nr02554h Chan Tanggarnjanavalukul 1, 2, 3, 4, 5 , Nutthaphon Phattharasupakun 1, 2, 3, 4, 5 , Kanokwan Kongpatpanich 3, 4, 5, 6 , Montree Sawangphruk 1, 2, 3, 4, 5
Nanoscale ( IF 5.8 ) Pub Date : 2017-08-18 00:00:00 , DOI: 10.1039/c7nr02554h Chan Tanggarnjanavalukul 1, 2, 3, 4, 5 , Nutthaphon Phattharasupakun 1, 2, 3, 4, 5 , Kanokwan Kongpatpanich 3, 4, 5, 6 , Montree Sawangphruk 1, 2, 3, 4, 5
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Manganese dioxide (MnO2) has been widely used as an active material for high-performance supercapacitors due to its high theoretical capacitance, high cycling stability, low cost, and environmental friendliness. However, the effect of its crystallographic phase on charge storage performances and mechanisms is not yet clear. Herein, MnO2-based supercapacitors with different structures including nanospheres, nanorods, nanotubes, and nanosheets have been fabricated and investigated. Among such structures, δ-MnO2 nanosheets exhibit the highest specific capacitance of 194.3 F g−1 at 1 A g−1 when compared with other phases and shapes. The maximum specific energy of the δ-MnO2 nanosheet supercapacitor is 23.4 W h kg−1 at 971.6 W kg−1 and the maximum specific power is 4009.2 W kg−1 at 15.9 W h kg−1 with a capacity retention of 97% over 15
000 cycles. The δ-MnO2 nanosheet mainly stores charges via a diffusion-controlled mechanism at the scan rates of 10–100 mV s−1, whilst the α-MnO2 with different morphologies including nanospheres, nanorods, and nanotubes store charges via a non-faradaic or non-diffusion controlled process especially at fast scan rates (50–100 mV s−1). Understanding the charge storage performance and mechanism of the MnO2 nanostructures with different crystallographic phases and morphologies may lead to the further development of supercapacitors.
中文翻译：
MnO 2纳米球，纳米棒，纳米管和纳米片的电荷存储性能及机理
二氧化锰（MnO 2）具有高理论电容，高循环稳定性，低成本和环境友好性，已被广泛用作高性能超级电容器的活性材料。然而，其结晶相对电荷存储性能和机理的影响尚不清楚。在此，已经制造并研究了具有包括纳米球，纳米棒，纳米管和纳米片的不同结构的基于MnO 2的超级电容器。在这样的结构中，δ-的MnO 2纳米片表现出194.3 F G的最高比电容-1 1个A G -1当与其他相和形状进行比较。所述的最大比能量δ-的MnO 2纳米片超级电容器在971.6 W kg -1时为23.4 W h kg -1，在15.9 W h kg -1时最大比功率为4009.2 W kg -1，在15 000次循环中的容量保持率为97％。将δ的MnO 2纳米片主要存储电荷经由在10-100毫伏S中的扫描速率扩散控制机构-1，而α-MnO的2具有不同形态，包括纳米球，纳米棒，纳米管和存储电荷经由非法拉第或非扩散控制的过程，尤其是在快速扫描速率（50–100 mV s -1）下。了解MnO的电荷存储性能和机理具有不同结晶相和形态的2种纳米结构可能导致超级电容器的进一步发展。
更新日期：2017-09-21
000 cycles. The δ-MnO2 nanosheet mainly stores charges via a diffusion-controlled mechanism at the scan rates of 10–100 mV s−1, whilst the α-MnO2 with different morphologies including nanospheres, nanorods, and nanotubes store charges via a non-faradaic or non-diffusion controlled process especially at fast scan rates (50–100 mV s−1). Understanding the charge storage performance and mechanism of the MnO2 nanostructures with different crystallographic phases and morphologies may lead to the further development of supercapacitors.
中文翻译：
MnO 2纳米球，纳米棒，纳米管和纳米片的电荷存储性能及机理
二氧化锰（MnO 2）具有高理论电容，高循环稳定性，低成本和环境友好性，已被广泛用作高性能超级电容器的活性材料。然而，其结晶相对电荷存储性能和机理的影响尚不清楚。在此，已经制造并研究了具有包括纳米球，纳米棒，纳米管和纳米片的不同结构的基于MnO 2的超级电容器。在这样的结构中，δ-的MnO 2纳米片表现出194.3 F G的最高比电容-1 1个A G -1当与其他相和形状进行比较。所述的最大比能量δ-的MnO 2纳米片超级电容器在971.6 W kg -1时为23.4 W h kg -1，在15.9 W h kg -1时最大比功率为4009.2 W kg -1，在15 000次循环中的容量保持率为97％。将δ的MnO 2纳米片主要存储电荷经由在10-100毫伏S中的扫描速率扩散控制机构-1，而α-MnO的2具有不同形态，包括纳米球，纳米棒，纳米管和存储电荷经由非法拉第或非扩散控制的过程，尤其是在快速扫描速率（50–100 mV s -1）下。了解MnO的电荷存储性能和机理
具有不同结晶相和形态的2种纳米结构可能导致超级电容器的进一步发展。
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