大豆分离蛋白／氧化石墨烯复合膜基超级电容器的制备及性能研究

Preparation and Performance Investigation of Supercapacitor based on Soybean Protein Isolate/Graphene Oxide Composite Membrane

超级电容器作为一种新型的储能器件受到了广泛关注。隔膜作为其重要组成部分承担着阻隔电子和传输电解质离子的双重作用。本论文采用环境友好、可再生、可降解的大豆分离蛋白为基体,结合性能优异的氧化石墨烯(GO)制备了一系列SPI/GO复合膜并负载Li_2SO_4构建了双电层超级电容器,超级电容器具有优良的电化学性能,在电流密度为1.0 A·g^(-1)电流密度下,比电容值可达到110 F·g^(-1),能量密度高达8.89W·h·kg^(-1)。

Supercapacitor as a new type of energy storage device has attracted much attention. Separator, an important part of the supercapacitor, plays a key role of blocking electrons and transporting electrolyte ions. In this paper, soybean protein isolate （SPI） which is environmentally friendly, renewable and degradable was used as the matrix to a series of SPI/GO composite membranes which were prepared with the excellent performance of graphene oxide （GO）. The electric double layer supercapacitor （EDLC） single cells were then fabricated with SPI/GO membranes cooperated with LizSO4. The optimal ELDC showed a specific capacitance of 110 F·g-1, and an excellent energy density of 8.89 W h kg-1 at the current density of 1.0 A·g-1, which performed a good electrochemical property.