Manganese oxide (MnO_x), as a benchmark pseudocapacitive material, has aroused great interest in electrochemical energy storage community. However, ion transport is seriously hindered in the densely packed bulk materials of highly loaded MnO_x electrodes. Here, the structural engineering for the electrodeposited MnO_x materials is realized by tuning the concentration of the complexing agents used in the electrodeposition process. The fabricated highly porous nanostructure in the thick oxide layer can minimize the ion diffusion distances to the interior electrode surface, and the optimized content of the hydrous species can facilitate the solid-phase diffusion of the electrolyte ions in the oxide lattice. The deposited MnO_x electrode with a high mass loading of 7.02 mg cm⁻² exhibits excellent rate capability due to the dual-tuning effect. An excellent specific capacitance of 161.2 F g⁻¹ (1.13 F cm⁻²) at a high current density of 20 mA cm⁻² can be obtained, which is comparable to the capacitance delivered by the low mass loading electrode at the same current density (214.8 F g⁻¹ for 0.54 mg cm⁻² sample), indicating its high material utilization. The performance of the fabricated electrode ranks on the top of the reported MnO_x materials with high mass for capacitive applications.

作为基准准电容材料，氧化锰（MnO _x）在电化学储能领域引起了极大的兴趣。然而，在高负载MnO _x电极的致密堆积的块状材料中，离子传输受到严重阻碍。在此，通过调节电沉积过程中使用的络合剂的浓度，可以实现电沉积MnO _x材料的结构工程。在厚的氧化物层中制造的高度多孔的纳米结构可以使到内部电极表面的离子扩散距离最小化，并且水合物种的优化含量可以促进电解质离子在氧化物晶格中的固相扩散。沉积的MnO _x7.02 mg cm ^-2的高质量负载电极由于双重调谐效应而具有出色的倍率能力。在20 mA cm ^-2的高电流密度下可获得161.2 F g ^-1（1.13 F cm ^-2）的优异比电容，与在相同电流密度下由低质量负载电极提供的电容相当（对于0.54 mg cm ^-2样品，为214.8 F g ^-1），表明其高材料利用率。所制造电极的性能在电容性应用的高质量MnO _x材料中名列前茅。