Ali Akbari Mohammad Saleh, Bagheri Robabeh, Song Zhenlun, Najafpour Mohammad Mahdi
Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran.
Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
Sci Rep. 2020 May 29;10(1):8757. doi: 10.1038/s41598-020-65674-x.
In this study, we investigate the effect of KFeO, as a new and soluble Fe salt at alkaline conditions, on oxygen-evolution reaction (OER) of Ni oxide. Both oxidation and reduction peaks for Ni in the presence and absence of Fe are linearly changed by (scan rate). Immediately after the interaction of [FeO] with the surface of the electrode, a significant increase in OER is observed. This could be indicative of the fact that either the [FeO] on the surface of Ni oxide is directly involved in OER, or, it is important to activate Ni oxide toward OER. Due to the change in the Ni(II)/(III) peak, it is hypothesized that Fe impurity in KOH or electrochemical cell has different effects at the potential range. At low potential, [FeO] is reduced on the surface of the electrode, and thus, is significantly adsorbed on the electrode. Finally, oxygen-evolution measurements of KFeO and NiO are investigated under chemical conditions. KFeO is not stable in the presence of Ni(II) oxide, and OER is observed in a KOH solution (pH ≈ 13).
在本研究中，我们研究了作为碱性条件下一种新型可溶性铁盐的高铁酸钾（KFeO）对氧化镍析氧反应（OER）的影响。在有和没有铁的情况下，镍的氧化峰和还原峰均随（扫描速率）呈线性变化。在[FeO]与电极表面相互作用后，立即观察到析氧反应显著增加。这可能表明氧化镍表面的[FeO]要么直接参与析氧反应，要么对氧化镍的析氧反应起激活作用很重要。由于镍（II）/（III）峰的变化，推测氢氧化钾或电化学电池中的铁杂质在该电位范围内有不同影响。在低电位下，[FeO]在电极表面被还原，因此，会大量吸附在电极上。最后，在化学条件下研究了高铁酸钾和氧化镍的析氧测量。高铁酸钾在氧化镍存在下不稳定，在氢氧化钾溶液（pH≈13）中观察到析氧反应。
