Valizadeh Amirreza, Aleshkevych Pavlo, Najafpour Mohammad Mahdi
Department of Chemistry, Institute for Advanced Studies in Basic Sciences, Zanjan 45137-66731, Iran.
Institute of Physics, Polish Academy of Sciences, Warsaw 02-668, Poland.
Inorg Chem. 2022 Jan 10;61(1):613-621. doi: 10.1021/acs.inorgchem.1c03331. Epub 2021 Dec 13.
The oxygen-evolution reaction (OER) through water oxidation is an inevitable reaction for water splitting toward storing energy. However, OER is a four-electron and slow reaction, which is also a bottleneck for water splitting. To find the role of Pt and PtO on the OER in the presence of Fe, the electrochemistry of Pt foil and PtO is investigated in the absence/presence of KFeO as a soluble Fe salt at pH ≈ 13. After the addition of KFeO, a remarkable increase in the OER is recorded in the presence of Pt or PtO. The obtained catalysts were characterized by operando visible spectroscopy, high-resolution transmission electron microscopy, scanning electron microscopy, electron-spin resonance spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and electrochemical methods. KOH solutions usually contain Fe and/or Ni impurities. It is found that neither Pt nor PtO is an OER catalyst in a Ni/Fe-free KOH, and even at an overpotential of 570 mV in purified KOH (pH ≈ 13), no clear OER was observed.
通过水氧化进行的析氧反应（OER）是水分解储能过程中不可避免的反应。然而，OER是一个四电子的慢反应，也是水分解的瓶颈。为了探究在有铁存在的情况下铂和氧化铂在OER中的作用，在pH≈13时，于不存在/存在作为可溶性铁盐的高铁酸钾（KFeO）的情况下，研究了铂箔和氧化铂的电化学性质。添加高铁酸钾后，在铂或氧化铂存在的情况下，析氧反应有显著增加。通过原位可见光谱、高分辨率透射电子显微镜、扫描电子显微镜、电子自旋共振光谱、X射线光电子能谱、X射线衍射和电化学方法对所得催化剂进行了表征。氢氧化钾溶液通常含有铁和/或镍杂质。发现在无镍/铁的氢氧化钾中，铂和氧化铂都不是析氧反应催化剂，即使在纯化的氢氧化钾（pH≈13）中过电位达到570 mV时，也未观察到明显的析氧反应。
