铁硼基海绵催化电极的制备及其高效析氢性能

采用温和化学镀法在非导电基底材料聚氨酯海绵(PU)上成功制备了NiB@Fe–B/PU催化电极，并通过掺杂少量第三种元素，如钴、钼等金属元素制备了NiB@Fe–Co–B/PU和NiB@Fe–Mo–B/PU催化电极。结果表明，掺杂钴、钼可明显提升NiB@Fe–B/PU催化电极的析氢性能，其中掺杂钴的性能更优。在0.5 mol/L缓冲液(磷酸缓冲盐溶液，PBS)中，NiB@Fe–Co–B/PU电极的析氢反应(HER)过电位仅为161 mV(电流密度, j=50 mA/cm2)，塔菲尔斜率为68.24 mV/dec，且在过电位为61 mV下能够稳定工作24 h以上，电化学稳定性良好。

Preparation and high-efficiency hydrogen evolution performance of iron-boron-based sponge catalytic electrode

Developing a high efficiency, stability and low cost catalytic electrode is of great practical significance to reduce the overpotential of hydrogen evolution. For this reason, NiB@Fe–B/PU catalytic electrode on non-conductive base material polyurethane sponge (PU) was prepared by a mild electroless plating method in this work. NiB@Fe–Co–B/PU, NiB@Fe–Mo–B/PU catalytic electrode were successfully prepared by doping a small amount of the third element, such as cobalt, molybdenum and other metal elements to improve its hydrogen evolution performance in neutral electrolyte solution. The results showed that the performance of NiB@Fe–B/PU catalytic electrode had significant improvement by doping of cobalt and molybdenum, and the performance of doping cobalt was better. The overpotential was only 161 mV(current density, j=50 mA/cm2) and the Tafel slope was 68.24 mV/dec for NiB@Fe–Co–B/PU catalytic electrode to hydrogen evolution reaction (HER) in 0.5 mol/L phosphate buffered saline (PBS). At the same time, the electrode showed good stability, which can work stably for more than 24 h under the overpotential of 61 mV.