The development of bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at high current density under industrial temperatures is crucial for large-scale industrial hydrogen production from water splitting. In this work, M-MnO@TNTA composite electrodes were prepared by depositing various metal ion-doped manganese oxide nanoparticles on the titania nanotube array (TNTA) by successive ionic layer adsorption reaction (SILAR) method, and their HER and OER electrocatalytic performances were investigated in 1 M KOH. Results show that the CoFe-MnO@TNTA composite electrode prepared by simultaneous doping of Co and Fe in MnO exhibits optimal catalytic performance. Compared with MnO@TNTA without ion doping, the overpotentials of CoFe-MnO@TNTA at 10 mA cm () for HER and OER are reduced by 571 and 665 mV. In addition, the electrode performance can be significantly enhanced by increasing the test temperature, and the porous array structure enables CoFe-MnO@TNTA to exhibit better performance at high current densities. At 50 °C, which is the common industrial electrolytic water temperature, the of CoFe-MnO@TNTA for HER is almost equal to that of the Pt/C electrode. The of CoFe-MnO@TNTA for HER is reduced by 35 mV compared with the Pt/C electrode. Moreover, of CoFe-MnO@TNTA for OER is significantly lowered by 111 and 184 mV compared with IrO and RuO electrodes. Utilizing CoFe-MnO@TNTA as both the cathode and anode for overall water splitting, the electrolysis voltage is merely 2.33 V under the current density of 200 mA cm, much lower than that of IrO (+)||Pt/C (–) (2.68 V). The present work may provide a valuable reference for the development of self-supporting bifunctional electrodes suitable for high-current-density water splitting at industrial temperatures.

中文翻译：

---

轻松制备CoFe-MnO2@二氧化钛纳米管阵列双功能电极，用于工业温度下高电流密度水分解


开发工业温度下高电流密度析氢反应（HER）和析氧反应（OER）双功能电催化剂对于大规模工业水分解制氢至关重要。本工作通过连续离子层吸附反应（SILAR）方法在二氧化钛纳米管阵列（TNTA）上沉积各种金属离子掺杂的氧化锰纳米粒子，制备了M-MnO@TNTA复合电极，并对其HER和OER电催化性能进行了表征。在 1 M KOH 中进行研究。结果表明，在MnO中同时掺杂Co和Fe制备的CoFe-MnO@TNTA复合电极表现出最佳的催化性能。与没有离子掺杂的MnO@TNTA相比，CoFe-MnO@TNTA在10 mA cm ()下的HER和OER过电势分别降低了571和665 mV。此外，通过提高测试温度可以显着增强电极性能，并且多孔阵列结构使CoFe-MnO@TNTA在高电流密度下表现出更好的性能。在50℃（常见的工业电解水温度）下，CoFe-MnO@TNTA 的HER 性能几乎与Pt/C 电极相同。与 Pt/C 电极相比，CoFe-MnO@TNTA 的 HER 降低了 35 mV。此外，与 IrO 和 RuO 电极相比，CoFe-MnO@TNTA 的 OER 显着降低了 111 和 184 mV。利用CoFe-MnO@TNTA作为阴极和阳极进行整体水分解，在200 mA cm电流密度下电解电压仅为2.33 V，远低于IrO (+)||Pt/C (–) （2.68V）。 本工作可为开发适合工业温度下高电流密度水分解的自支撑双功能电极提供有价值的参考。