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Nb2O5 Nanoparticles Anchored on an N-Doped Graphene Hybrid Anode for a Sodium-Ion Capacitor with High Energy Density
ACS Omega ( IF 3.7 ) Pub Date : 2018-11-27 00:00:00 , DOI: 10.1021/acsomega.8b02141 Liaona She 1, 2, 3 , Zhe Yan 2 , Liping Kang 1 , Xuexia He 2, 3 , Zhibin Lei 2, 3 , Feng Shi 2, 3 , Hua Xu 2, 3 , Jie Sun 2, 3 , Zong-Huai Liu 1, 2, 3
ACS Omega ( IF 3.7 ) Pub Date : 2018-11-27 00:00:00 , DOI: 10.1021/acsomega.8b02141 Liaona She 1, 2, 3 , Zhe Yan 2 , Liping Kang 1 , Xuexia He 2, 3 , Zhibin Lei 2, 3 , Feng Shi 2, 3 , Hua Xu 2, 3 , Jie Sun 2, 3 , Zong-Huai Liu 1, 2, 3
Affiliation
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Sodium-ion capacitors (SICs) have gained great interest for mid- to large-scale energy storage applications because of their high energy and high power densities as well as long cycle life and low cost. Herein, a T-Nb2O5 nanoparticles/N-doped graphene hybrid anode (T-Nb2O5/NG) was prepared by solvothermal treating a mixed ethanol solution of graphene oxide (GO), urea, and NbCl5 at 180 °C for 12 h, followed by calcining at 700 °C for 2 h, in which T-Nb2O5 nanoparticles with average size of 17 nm were uniformly anchored on the surface of the nitrogen-doped reduced GO because their growth and aggregation were hindered, and also, the electronic conductivity and the active sites of T-Nb2O5/NG were improved by doping nitrogen. The T-Nb2O5/NG anode showed superior rate capability (68 mA h g–1 even at 2 A g–1) and good cycling life (106 mA h g–1 at 0.2 A g–1 for 200 cycles and 83 mA h g–1 at 1 A g–1 for 1000 cycles) and also showed high-rate pseudocapacitive behavior from kinetics analysis. A novel SIC system had been constructed by using the T-Nb2O5/NG as anode and commercially activated carbon as the cathode; it delivered an energy density of 40.5 W h kg–1 at a power density of 100 W kg–1 and a long-term cycling stability (capacity retention of 63% after 5000 consecutive cycles at a current density of 1 A g–1) and showed a promising application for highly efficient energy storage systems.
中文翻译：
Nb 2 O 5纳米颗粒锚固在高能量密度钠离子电容器的N掺杂石墨烯杂化阳极上
钠离子电容器（SIC）由于具有高能量和高功率密度以及长循环寿命和低成本，因此在中大型储能应用中引起了极大的兴趣。在此，通过在180 ℃对石墨烯氧化物（GO），尿素和NbCl 5的混合乙醇溶液进行溶剂热处理来制备T-Nb 2 O 5纳米颗粒/ N掺杂的石墨烯杂化阳极（T-Nb 2 O 5 / NG）。 °C持续12 h，然后在700°C煅烧2 h，其中T-Nb 2 O 5平均粒径为17 nm的纳米颗粒由于其生长和聚集受到阻碍而均匀地锚定在氮掺杂还原GO的表面上，并且通过提高T-Nb 2 O 5 / NG的电子电导率和活性位点掺杂氮。T形的Nb 2 ö 5 / NG阳极表现出优异的倍率性能（68毫安汞柱-1甚至在2 A G -1）和良好的循环寿命（106毫安汞柱-1 0.2 A G -1为200个周期和83毫安hg –1在1 A g –1时1000次循环），并且从动力学分析还显示出高速率的伪电容行为。以T-Nb 2 O 5 / NG为阳极，商业活性炭为阴极，构建了一种新型的SIC体系。它以100 W kg –1的功率密度提供了40.5 W h kg –1的能量密度，并具有长期的循环稳定性（在1 A g –1的电流密度下，经过5000次连续循环后，容量保持率为63％）并展示了在高效储能系统中的有希望的应用。
更新日期：2018-11-27
中文翻译：
Nb 2 O 5纳米颗粒锚固在高能量密度钠离子电容器的N掺杂石墨烯杂化阳极上
钠离子电容器（SIC）由于具有高能量和高功率密度以及长循环寿命和低成本，因此在中大型储能应用中引起了极大的兴趣。在此，通过在180 ℃对石墨烯氧化物（GO），尿素和NbCl 5的混合乙醇溶液进行溶剂热处理来制备T-Nb 2 O 5纳米颗粒/ N掺杂的石墨烯杂化阳极（T-Nb 2 O 5 / NG）。 °C持续12 h，然后在700°C煅烧2 h，其中T-Nb 2 O 5平均粒径为17 nm的纳米颗粒由于其生长和聚集受到阻碍而均匀地锚定在氮掺杂还原GO的表面上，并且通过提高T-Nb 2 O 5 / NG的电子电导率和活性位点掺杂氮。T形的Nb 2 ö 5 / NG阳极表现出优异的倍率性能（68毫安汞柱-1甚至在2 A G -1）和良好的循环寿命（106毫安汞柱-1 0.2 A G -1为200个周期和83毫安hg –1在1 A g –1时1000次循环），并且从动力学分析还显示出高速率的伪电容行为。以T-Nb 2 O 5 / NG为阳极，商业活性炭为阴极，构建了一种新型的SIC体系。它以100 W kg –1的功率密度提供了40.5 W h kg –1的能量密度，并具有长期的循环稳定性（在1 A g –1的电流密度下，经过5000次连续循环后，容量保持率为63％）并展示了在高效储能系统中的有希望的应用。
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