Simple preparation, favorable price and environmental protection have been a long-term challenge in the field of electrochemistry. Herein, we studied and prepared a bifunctional Mo-doped Co₃O₄ ultrathin nanosheets, which has been validated as an effective binder-free electrode material for electrocatalytic water splitting and supercapacitors. The material has a large specific surface area, high electrical conductivity and exposure to more active sites, breaking down the limited performance and range of use of transition metal oxides. Benefiting from intriguing ultrathin property and conductivity, OER and HER process of 0.4Mo-Co₃O₄ have a small Tafel slope of 83.7 and 98 mV dec⁻¹, respectively. The current density at 10 mA cm⁻² show a low overpotential of 315 and 79 mV and significant stability. The water electrolytic device requires a potential of 1.64 V to reach 10 mA cm⁻², and the potential change is negligible after 12 h of continuous electrolysis. In addition, the manifest improved electrochemical performance of 0.3Mo-Co₃O₄ as supercapacitor electrode material shows high areal capacitance 2815 mF cm⁻² at 1 mA cm⁻², excellent rate performance (85% at 10 mA cm⁻²) and retains 90% of the initial capacitance by cycling 5000 at a current density of 10 mA cm⁻². Moreover, 0.3Mo-Co₃O₄||0.3Mo-Co₃O₄ symmetrical supercapacitor has a maximum volumetric energy density of 1.25 mW h cm⁻³ at a power density of 7.1 mW cm⁻³ and superior cycle life. The influence of doping on electrochemical performance was studied by changing the content of doped metal ions, which is of great significance for the exploration of supercapacitor and electrocatalytic hydrolysis of bifunctional electrode materials.

制备简单、价格优惠、环保一直是电化学领域的长期挑战。在此，我们研究并制备了双功能 Mo 掺杂 Co ₃ O ₄超薄纳米片，该纳米片已被验证为一种有效的无粘合剂电极材料，可用于电催化水分解和超级电容器。该材料具有较大的比表面积、高导电性和更多的活性位点，打破了过渡金属氧化物有限的性能和使用范围。受益于迷人的超薄特性和导电性，0.4Mo-Co ₃ O _{4 的}OER 和 HER 工艺具有 83.7 和 98 mV dec ^-1的小塔菲尔斜率， 分别。10 mA cm ^{-2 下}的电流密度显示出 315 和 79 mV 的低过电位和显着的稳定性。水电解装置需要1.64 V的电位才能达到10 mA cm ^-2，连续电解12小时后电位变化可以忽略不计。此外，作为超级电容器电极材料的 0.3Mo-Co ₃ O ₄明显改善的电化学性能在 1 mA cm ^{-2 下}显示出 2815 mF cm ^{-2 的}高面电容，优异的倍率性能（在 10 mA cm ^{-2 下为}85% ）和通过以 10 mA cm ^-2的电流密度循环 5000 次，保留了 90% 的初始电容。此外，0.3Mo-Co ₃ O₄ ||0.3Mo-Co ₃ O ₄对称超级电容器在7.1 mW cm ^-3的功率密度下具有1.25 mW h cm ^-3的最大体积能量密度和优异的循环寿命。通过改变掺杂金属离子的含量来研究掺杂对电化学性能的影响，这对探索超级电容器和双功能电极材料的电催化水解具有重要意义。