Publication date: 10th November 2021
Electrocatalysis constitutes one of the most promising alternatives to produce green hydrogen. For this purpose, electrodes based on nickel oxide hydroxide (NiOOH) and its derivatives doped with iron have attracted special attention due to their high performance in alkaline media. In this work, a procedure based on highly porous flame annealed Pencil Graphite Rods have been performed for the preparation of Ni, Fe and NiFe decorated electrodes. Beyond the low cost and reasonable performance obtained, we provide a detailed analysis of the electrochemical response of these electrodes using impedance spectroscopy, which provides novel information that may help to understand the behaviour of Ni based electrodes in general. Detection of the Ni phase transitions during electrochemical measurements have traditionally been performed by non-electrochemical measurements. Our results show the potential of using impedance spectroscopy to characterize these electrodes under operating conditions. In this sense, through the analysis of the electrode capacitance we were able to separate the Ni2+/Ni3+ and Ni3+/Ni4+ redox transitions, including the identification of the hydrated α-Ni(OH)2/γ-NiOOH and non-hydrated β-Ni(OH)2/β-NiOOH) phases. Finally, with these data could make visible and highlight how the Ni3+/Ni4+ redox transition activates charge transfer and therefore oxygen evolution reaction
The authors want to acknowledge the Ministerio de Economía y Competitividad (MINECO) from Spain (ENE2017-85087-C3-1-R), University Jaume I (UJI-B2019-20) and Generalitat Valenciana (PROMETEO/2020/028) for financial support. Serveis Centrals d’Instrumentació Científica from UJI are acknowledged for SEM measurements.
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