基于不锈钢毡的自支撑催化电极析氧性能研究

Performance of self-supporting catalyticelectrode based on stainless steel felt toward oxygen evolution reaction

电解水制氢技术在清洁能源转化中具有重要应用价值,但开发低成本、高性能的析氧电极仍具有挑战性。采用不锈钢纤维毡为基底,通过一步电沉积法在其表面原位生长镍/铁层状氢氧化物薄膜,所制备的催化电极成本低廉、析氧活性良好。电化学测试结果表明,在1 mol/L KOH电解液中,电流密度为10 mA/cm^(2)时所需的过电位为242 mV,相应Tafel斜率仅为39.4 mV/dec,其性能优于商业铱基催化剂制备的电极性能。72 h恒电流测试过程中析氧催化活性未发生明显衰减。

In terms of clean energy conversion,hydrogen production technology by electrochemical water splitting has important application value.However,challenges remain in developing low-cost and highperformance oxygen evolution electrodes.Ni/Fe layered double hydroxide films were developed in situ on the surface of stainless steel fiber using onestep electrodeposition.The catalytic electrode has low cost and favourable activity of oxygen evolution.The electrochemical test results indicate that an overpotential of 242 mV is achieved at the current density of 10 mA/cm^(2) in 1 mol/L KOH.Meanwhile,the corresponding Tafel slope is only 39.4 mV/dec,which has superior performance of the electrode than produced by commercial iridium based catalyst.Besides,oxygen evolution catalytic activity has no apparent attenuation during 72 h constant current test.