State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, P. R. China.
School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China.
Phys Chem Chem Phys. 2023 Jun 28;25(25):16718-16726. doi: 10.1039/d3cp00166k.
Researchers mainly explore the mechanism of pseudocapacitance through studying electrode materials with Faraday pseudocapacitive behavior. Here, we found that BiWO, a typical Aurivillius phase material with pseudo-perovskite structure, showed nearly ideal pseudocapacitive behavior. The cyclic voltammetry curve is approximately rectangular in shape, with no redox peaks, which is similar to that of carbon materials. And the shape of the galvanostatic charge-discharge curve is close to an isosceles triangle. In addition, the kinetic analysis demonstrated that the electrochemical process of the A-BiWO electrode is dominated by surface processes, not diffusion. The A-BiWO electrode material presents a great volumetric specific capacitance of 466.5 F cm at 0.5 A g. These electrochemical properties confirm that the BiWO material can serve as an ideal support material to explore pseudocapacitive energy storage. This work also provides guidance for the development of new pseudocapacitive materials.
研究人员主要通过研究具有法拉第赝电容行为的电极材料来探索赝电容的机理。在这里，我们发现 BiWO，一种具有类钙钛矿结构的典型的 A 位双取代层状钙钛矿结构材料，表现出近乎理想的赝电容行为。循环伏安曲线的形状近似为矩形，没有氧化还原峰，这与碳材料相似。而且，恒电流充放电曲线的形状接近于等腰三角形。此外，动力学分析表明，A-BiWO 电极的电化学过程主要受表面过程控制，而不是扩散过程。A-BiWO 电极材料在 0.5 A g 时表现出高达 466.5 F cm 的巨大体积比电容。这些电化学性能证实了 BiWO 材料可用作探索赝电容储能的理想支撑材料。这项工作还为开发新型赝电容材料提供了指导。
