In Situ Doping Boron Atoms into Porous Carbon Nanoparticles with Increased Oxygen Graft Enhances both Affinity and Durability toward Electrolyte for Greatly Improved Supercapacitive Performance
In Situ Doping Boron Atoms into Porous Carbon Nanoparticles with Increased Oxygen Graft Enhances both Affinity and Durability toward Electrolyte for Greatly Improved Supercapacitive Performance
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DOI：
10.1002/adfm.201804190
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发表时间：
2018-08
影响因子：
19
通讯作者：
Fei Sun;Zhibin Qu;Jihui Gao;H. Wu;Fang Liu;Rui Han;Lijie Wang;Tong Pei;Guang-bo Zhao
中科院分区：
文献类型：
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作者：
Fei Sun;Zhibin Qu;Jihui Gao;H. Wu;Fang Liu;Rui Han;Lijie Wang;Tong Pei;Guang-bo Zhao
超级电容器是一种重要的储能系统，适用于高功率应用，碳电极是其中的关键部件。设计和合成具有超级电容活性(电容和倍率能力)和稳定性的先进碳材料一直是超级电容器发展的重点。本研究通过在纳米多孔碳颗粒中原位掺杂硼原子来制备高性能的碳电极，这种方法是通过连续喷雾辅助共组装工艺实现的。硼掺杂导致了额外的氧接枝到碳表面，从而提高了碳电极的润湿性和耐久性。密度泛函理论计算进一步表明，硼掺杂增强了电解液离子的渗透性和与碳表面的相互作用，从而提高了电容和倍率能力。所构建的对称型水基超级电容器具有全面的性能改进，包括高能量密度(9.1WH kg−1)和功率密度(24.1kW kg−1)以及超长循环寿命(10万次循环)。这项工作首次对硼掺杂在提高高性能超级电容器用碳材料的超电容活性和稳定性方面的作用提供了见解。
Supercapacitors represent an important energy storage system for high power applications with carbon electrodes acting as the key component. Design and synthesis of advanced carbon materials with supercapacitive activity (capacitance and rate capability) and stability have been the focus of supercapacitor developments. This study reports a high‐performance carbon electrode by in situ doping boron atoms into nanoporous carbon particles, which is achieved by a continuous spraying assisted coassembly process. Boron doping leads to extra oxygen graft into carbon surface, enabling both enhanced wettability and durability for the fabricated carbon electrodes. Density functional theory calculations further suggest that boron doping enhances electrolyte ion penetration and interactions with carbon surface, leading to the improved capacitances and rate capability. The constructed symmetric aqueous supercapacitor exhibits all‐round performance improvements including high energy density (9.1 Wh kg−1) and power density (24.1 kW kg−1) as well as ultralong cycling life (100 000 cycles). This work for the first time provides insights into the role of boron doping in enhancing both supercapacitive activity and stability of carbon materials for high‐performance supercapacitors.