【摘要】 金属氧化物钨酸锌（ZnWO₄）因良好的电化学稳定性和赝电容特性成为超级电容器电极材料的理想选择；还原氧化石墨烯（rGO）兼具独特的二维结构、高比表面积与高载流子迁移率等性能，是制备电极材料的优良添加剂。但是传统石墨烯复合材料因石墨烯分散性较差导致的复合不充分、比容量低、稳定性较差等问题，制约了石墨烯复合电极材料的性能提升。有鉴于此，本工作提供了一种基于非离子表面活性剂辅助制备超级电容器电极ZnWO₄@rGO的方法，即在水热法的基础上，引入聚乙烯吡咯烷酮（PVP）这一非离子型表面活性剂调节与改性ZnWO₄@rGO，利用该方法制备出的ZnWO₄@rGO电极材料的比容量高达1190F·g^-1，能量密度为49.9Wh·kg^-1、1000次循环后电容保持率为97.4%。这种卓越的性能源于PVP的“导电网络+活性提升+结构稳定+抑制粉化”四重作用机制，进而使得ZnWO₄@rGO的均匀性、结构稳定性和电化学性能得以提升。更多还原

【Abstract】 Metal oxide zinc tungstate（ZnWO₄） is an ideal choice for supercapacitor electrode materials due to its good electrochemical stability and pseudocapacitive properties;meanwhile reduced graphene oxide（rGO） is an excellent additive for the preparation of electrode materials due to its unique two-dimensional structure,high specific surface area,carrier mobility and other unique properties.However,the conventional graphene composites constrain the performance of graphene composite electrode materials due to insufficient composite,low specific capacity,and poor stability caused by poor graphene dispersion.In view of this,the present work provides a method based on nonionic surfactant-assisted preparation of supercapacitor electrode ZnWO₄@rGO,i.e.,on the basis of the hydrothermal method,polyvinylpyrrolidone（PVP）,a nonionic surfactant,is introduced to regulate and modify the ZnWO₄@rGO,and the ZnWO₄@rGO electrode material prepared using this method has a specific capacity as high as 1 190 F·g^-1,the energy density was 49.9 Wh·kg^-1,and the capacitance retention rate was 97.4% after 1 000 cycles.This excellent performance is attributed to the four-fold mechanism of "conductive network+activity enhancement+structural stabilization+inhibition of chalking" of PVP,which leads to the enhancement of the homogeneity,structural stability,and electrochemical properties of ZnWO₄@rGO.更多还原