Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.021
Publication date: 18th July 2019
Photovoltaic (PV) cells powered water electrolysis systems provide a facile and viable way to convert the abundant but intermittent solar energy into hydrogen (H2) fuel[1]. The large-scale deployment of such systems requires the development of efficient and cost-effective catalysts for overcoming the sluggish reaction kinetics associated with the anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER) in water splitting[2]. Further, the integration of water electrolyzer cells with PV cells also calls for the exceptional robustness of the catalyst materials that can effectively withstand the frequent power interruptions caused by cell shutdowns and/or weather changes[3]. To date, these requirements have posed a grand challenge in material development. In this work, atomically thin FeCoNi (oxy)hydroxide nanosheets (FeCoNi-ATNs) were prepared via a facile and scalable one-step bottom-up method. The obtained FeCoNi-ATNs exhibited extremely high mass activities for both OER and HER (1931 A g-1 at 330 mV for OER; 1819 A g-1 at 200 mV for HER) in alkaline solutions, which were among the highest of catalyst materials reported so far. More excitingly, by employing FeCoNi-ATNs as the catalyst material for both anode and cathode, a fully reversible water electrolyzer cell (WEC) was assembled, which exhibited a robust reversibility between two half reactions in water electrolysis under a high current density (100 mA cm-2). The as-fabricated WEC can effectively overcome the stability issues caused by electrode depolarization during frequent power interruptions, an inevitable phenomenon which is commonly brought about by the usage of intermittent renewable energy supplies.
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