The promising pseudocapacitive charge storage insists the strategic design of three-dimensional architecture of nanostructures with extra-active redox sites on and/or near surface with high capacity of ionic insertion into the porous network of electrodes. Herein, we report the urchin like structure of α-MnO₂ nanorods grown on carbon nano-onion (CNO) support via simple, cost-effective wet chemical method. The highly crystalline α-MnO₂ nanorods with larger spinel sizes of 0.46 nm and 0.18 nm are characterized by SEM, TEM, XRD and Raman spectra. These spinel structures of α-MnO₂ nanorods offers large cavity for ions insertion, which further improved by increasing temperature due to fast ionic mobility. The temperature driven increment of specific capacity from 202 Cg^-1 to 363 Cg^-1 at current density 0.3 Ag^-1 is accomplished owing to the improved ionic conductivity, surface area and fast charge transfer. Further the 78% capacitance retention after 1000 cycles at 70 °C is realized, which is just 17% lower that the cyclic stability at 4 °C. It emphasizes an importance of three-dimensional design/architecture of electrode materials for the high-temperature pseudocapacitor applications.

有前途的伪电容电荷存储坚持对纳米结构的三维结构进行战略设计，该结构在表面上和/或附近具有超活泼的氧化还原位点，并且具有将离子插入到电极的多孔网络中的高容量。此，我们报告等α-MnO的结构的海胆_2个纳米棒通过简单的，具有成本效益的湿化学方法生长在碳纳米洋葱（CNO）的支持。高度结晶的α-MnO的_2个纳米棒的0.46纳米和0.18纳米的尖晶石大小通过SEM，TEM，X射线衍射和拉曼光谱表征。这些尖晶石结构α-MnO的₂纳米棒为离子插入提供了较大的空腔，由于快速的离子迁移率，温度升高可进一步改善该空腔。由于改善的离子电导率，表面积和快速的电荷转移，在电流密度为0.3 Ag ^-1时实现了比容量从202 Cg ^-1到363 Cg ^-1的温度驱动增量。此外，在70°C下经过1000次循环后，可实现78％的电容保持率，仅比4°C下的循环稳定性低17％。它强调了电极材料的三维设计/架构对于高温伪电容器应用的重要性。