【作者】 潘伟； 薛冬峰；

【Author】 Pan Wei;Xue Dongfeng;State Key Laboratory of Rare Earth Resources Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences;School of Materials,Northeastern University;

【机构】 中国科学院长春应用化学研究所稀土资源利用国家重点实验室； 东北大学材料学院；

【摘要】 自然界中铁元素储量丰富、价态多样、绿色安全,微纳米结构的铁基材料表面含有复杂的表面官能团,因此铁的氧化物电极材料具有强吸附性和高反应活性。铁基赝电容超级电容器的能量密度已经达到86.4 Wh kg^-1(0.723 m Wh cm^-3)和功率密度达到11.6 kWkg^-1(0.973 m Wcm^-3)。赝电容电极材料的储能机制是可逆的表界面法拉第反应。由于铁元素的存在形式多样,电化学反应过程中参与反应的铁元素极易反应生成溶于水的物质,这降低活性物质负载量并且破坏导电网络,使得超级电容器的循环稳定性及寿命降低。为解决这一难题,本课题组尝试通过筛选配体、调节电解液中多种配体的比例,在电极材料表界面形成不同稳定性的配合物,从而抑制电极表界面的溶解;同时结合改变工作电压范围、活化时间等条件,使用原位合成方法制备纳米非晶铁基胶体离子电极材料。使用XDR、SEM、CV等表征手段对铁基电极材料进行表征,研究铁基超级电容器的电化学反应特性,成功实现高能量密度和功率密度的铁基电容器。更多还原

【Abstract】 The surface of iron based micro/nano structured materials contains functional groups, so the iron oxide electrode materials have a strong adsorption ability and high reactivity. The surface or interface of electrode materials affects the energy and power densities of supercapacitors. Due to the existence of diverse iron oxide forms, the electrochemical reaction of iron oxides can easily produce dissolved substances during the reaction process which can reduce the mass load and damage the conductive network, as well as the reduction of the cycling stability and service life. In order to solve this problem, our research group has attempted to regulate ligand ratio of the electrolyte to inhibit the electrode surface dissolution, and with the change of the working voltage and activated time, we synthesized the colloidal ion based electrode material by in-situ synthesis method. The electrochemical nature of iron based electrode materials was investigated.更多还原