Rationally design and synthesize electrode materials with hollow nano-sphere (HNS) structures for high-performance flexible asymmetric supercapacitors (FASCs) still remains challenging. Herein, we developed a facile strategy for the construction of MnCo₂O₄ HNS. The unique hollow structure provided abundant open channels and redox active sites, shortening the ion diffusion path and facilitating the fast electrolyte transport. Moreover, due to the substantial multi-hierarchical pores in MnCo₂O₄ HNS, its specific surface area reached up to 110.15 m² g⁻¹. Subsequently, MnCo₂O₄ HNS as a battery-type material was grown on activated carbon cloth (ACC), and the resultant MnCo₂O₄ HNS/ACC electrode manifested high specific capacities. Furthermore, the MnCo₂O₄ HNS/ACC//ACC FASCs were fabricated, which exhibited remarkable electrochemical properties in terms of enhanced energy and power densities (0.78 mWh cm⁻³ at 9.78 mW cm⁻³) and superior mechanical flexibility. This work provides a new design of hollow nano-structures on carbon substrates, which can be a promising candidate for high-performance electrodes in FASCs.

合理设计和合成具有空心纳米球（HNS）结构的电极材料以用于高性能柔性非对称超级电容器（FASC）仍然具有挑战性。在本文中，我们开发了一种用于构建MnCo ₂ O ₄ HNS的简便策略。独特的空心结构提供了丰富的开放通道和氧化还原活性位点，缩短了离子扩散路径，并促进了电解质的快速传输。此外，由于MnCo ₂ O ₄ HNS中存在大量的多层次孔，其比表面积达到110.15 m ²  g ^-1。随后，MnCo ₂ O ₄作为电池型材料的HNS生长在活性炭布（ACC）上，并且所得的MnCo ₂ O ₄ HNS / ACC电极表现出高的比容量。此外，制备了MnCo ₂ O ₄ HNS / ACC // ACC FASC，其在增强的能量和功率密度（在9.78mW cm ^-3处为0.78mWh cm ^-3）和优异的机械柔韧性方面表现出显着的电化学性质。这项工作为碳基板上的中空纳米结构提供了一种新的设计，可以成为FASC中高性能电极的有希望的候选者。