High-energy-density electrochemical flow capacitors containing quinone derivatives impregnated in nanoporous carbon beads
High-energy-density electrochemical flow capacitors containing quinone derivatives impregnated in nanoporous carbon beads
复制标题
含有浸渍在纳米多孔碳珠中的醌衍生物的高能量密度电化学液流电容器
DOI：
10.1039/c6ta08733g
复制
发表时间：
2017
影响因子：
11.9
通讯作者：
Itaru Honma
中科院分区：
文献类型：
--
作者：
Takaaki Tomai;Hayate Saito;Itaru Honma
电化学液流电容器（Electrochemical Flow Capacitors，EFC）结合了电化学电容器的高功率容量和氧化还原液流电池的可扩展性，是一种很有前途的智能电网储能装置。然而，有限的能量密度的EFC是他们的缺点。在这项研究中，我们展示了一种很有前途的方法，在EFCs的电容增强，基于浸渍的氧化还原活性醌衍生物在纳米多孔碳的可流动的浆料电解质。此外，我们采用了两种不同的醌衍生物具有不同的氧化还原电位作为阳极和阴极电解质，促进质子穿梭机制。所得浆料电解质表现出良好的流动性、高功率容量和约20 W h kg-1的能量密度，比未改性的碳浆料高2.5倍。在间歇流动系统中的充电-放电测量证实，改性的浆料电解质适用于EFC系统。这种基于使用固态氧化还原活性有机物的方法应该可以极大地增强氧化还原液流电池和EFC等流动型储能系统的电容。
Electrochemical flow capacitors (EFCs) are promising energy storage devices for smart grids due to their combination of the high power capabilities of electrochemical capacitors and the scalability of redox flow batteries. However, the limited energy densities of EFCs are their drawback. In this study, we demonstrate a promising approach to capacitance enhancement in EFCs, based on the impregnation of redox-active quinone derivatives in nanoporous carbon for flowable slurry electrolytes. Moreover, we employed two different quinone derivatives with different redox potentials as anodic and cathodic electrolytes, facilitating a proton-shuttle mechanism. The resulting slurry electrolytes exhibited good flowability, high power capability and an energy density of approximately 20 W h kg−1, 2.5 times higher than that of the unmodified carbon slurry. Charge–discharge measurements in an intermittent flow system confirmed that the modified slurry electrolytes were suitable for use in EFC systems. This approach, based on the use of solid-state redox-active organics, should allow extraordinary capacitance enhancement in flow-type energy storage systems such as redox flow batteries and EFCs.