Herein, multi-metal hydroxide exhibiting enhanced electrochemical performance for supercapacitor and oxygen evolution reaction (OER) applications is presented experimentally and theoretically. This is achieved via electronic structure modification through metal doping, including Mn, Fe, and Mg, into NiCo hydroxide. Both X-ray photoelectron spectroscopy and density functional theory calculation are used to examine the electronic structure modification. We show that the electrochemical performance improves with elevating metal, giving the hydroxide having 5 cations, i.e., high entropy hydroxide (HEOH), the best one. The Co²⁺ and Ni²⁺ dominates the capacitance, the phase stability accounts for the cycle stability, and the charge transfer resistance controls the rate retention in the supercapacitor. The obtained HEOH exhibits excellent specific capacity of 2,476 mC cm⁻² at 2 mA cm⁻², remarkable rate retention of 73% at 10 mA cm⁻², and outstanding cycle stability of 116% after 2,000 cycles. Supercapattery cell consisting of HEOH//Fe₃O₄/activated carbon clothes is shown to have a high energy density of 0.2 mWh cm⁻² at power density of 0.8 mW cm⁻² with excellent long-term durability. The HEOH also shows OER overpotential of 240 and 361 mV at high current densities of 100 and 1,500 mA cm⁻², respectively, and stability up to 100-h, outperforming the benchmark catalyst.

在此，通过实验和理论介绍了多金属氢氧化物在超级电容器和析氧反应 (OER) 应用中表现出增强的电化学性能。这是通过将金属（包括 Mn、Fe 和 Mg）掺杂到 NiCo 氢氧化物中来改变电子结构来实现的。X射线光电子能谱和密度泛函理论计算均用于检查电子结构修改。我们表明电化学性能随着金属的升高而提高，给出具有 5 个阳离子的氢氧化物，即高熵氢氧化物 (HEOH)，最好的一种。Co ²⁺和 Ni ²⁺决定电容，相位稳定性决定循环稳定性，电荷转移电阻控制超级电容器中的速率保持。获得的HEOH在2 mA cm ^{-2下表现出2,476 mC cm -2的优异比容量，在10 mA cm -2}下具有73%的显着倍率保持率，以及在2,000次循环后116%的出色循环稳定性。由 HEOH//Fe ₃ O ₄ /活性炭布组成的超级电池显示出在 0.8 mW cm ^{-2的功率密度下具有 0.2 mWh cm -2}的高能量密度，具有出色的长期耐用性。HEOH 在 100 和 1,500 mA cm 的高电流密度下还显示出 240 和 361 mV 的 OER 过电势^-2，稳定性高达 100 小时，优于基准催化剂。