Sengupta Dipanjan, Privitera Stefania M S, Milazzo Rachela Gabriella, Bongiorno Corrado, Scalese Silvia, Lombardo Salvatore
Institute for Microelectronics and Microsystems (IMM), National Research Council (CNR) Zona Industriale Ottava Strada, 5 05121 Catania Italy
RSC Adv. 2020 Jul 3;10(43):25426-25434. doi: 10.1039/d0ra03856c.
Oxygen evolution reaction (OER) is a demanding step within the water splitting process for its requirement of a high overpotential. Thus, to overcome this unfavourable kinetics, an efficient catalyst is required to expedite the process. In this context, we report on Ni foam functionalised with low cost iron (Fe) and iron hydroxide (Fe(OH) ), wet chemically synthesized as OER catalysts. The prepared catalyst based on iron hydroxide precipitate shows a promising performance, exhibiting an overpotential of 270 mV (at a current density of 10 mA cm in 1 M KOH solution), an efficient Tafel slope of ∼50 mV dec and stable chronopotentiometry. The promising performance of the anode was further reproduced in the overall water splitting reaction with a two electrode cell. The overall reaction requires a lower potential of 1.508 V to afford 10 mA cm, corresponding to 81.5% electrical to fuel efficiency.
析氧反应（OER）在水分解过程中是一个要求苛刻的步骤，因为它需要较高的过电位。因此，为了克服这种不利的动力学，需要一种高效催化剂来加速该过程。在此背景下，我们报道了通过湿化学合成法制备的、以低成本铁（Fe）和氢氧化铁（Fe(OH)₃）功能化的泡沫镍作为析氧反应催化剂。基于氢氧化铁沉淀制备的催化剂表现出了良好的性能，在1 M KOH溶液中，当电流密度为10 mA cm⁻²时，过电位为270 mV，塔菲尔斜率约为50 mV dec⁻¹，并且在计时电位法测试中表现稳定。通过两电极电池进行的全水解反应进一步重现了阳极的良好性能。全反应在提供10 mA cm⁻²电流时需要较低的1.508 V电位，对应的电能到燃料的效率为81.5%。
