Sharma Pratigya, Minakshi Manickam, Whale Jonathan, Jean-Fulcrand Annelise, Garnweitner Georg
Engineering and Energy, Murdoch University, Perth, WA 6150, Australia.
Institut für Partikeltechnik, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany.
Nanomaterials (Basel). 2021 Feb 26;11(3):580. doi: 10.3390/nano11030580.
Nickel-based bimetallic oxides (BMOs) have shown significant potential in battery-type electrodes for pseudo-capacitors given their ability to facilitate redox reactions. In this work, two bimetallic oxides, NiMoO and NiWO, were synthesized using a wet chemical route. The structure and electrochemical properties of the pseudo-capacitor cathode materials were characterized. NiMoO showed superior charge storage performance in comparison to NiWO, exhibiting a discharge capacitance of 124 and 77 Fg, respectively. NiMoO, moreover, demonstrates better capacity retention after 1000 cycles with 87.14% compared to 82.22% for NiWO. The lower electrochemical performance of the latter was identified to result from the redox behavior during cycling. NiWO reacts in the alkaline solution and forms a passivation layer composed of WO on the electrode, while in contrast, the redox behavior of NiMoO is fully reversible.
基于镍的双金属氧化物（BMOs）因其促进氧化还原反应的能力，在用于赝电容器的电池型电极中显示出巨大潜力。在这项工作中，采用湿化学路线合成了两种双金属氧化物NiMoO和NiWO。对赝电容器阴极材料的结构和电化学性能进行了表征。与NiWO相比，NiMoO表现出优异的电荷存储性能，其放电电容分别为124和77 F/g。此外，NiMoO在1000次循环后表现出更好的容量保持率，为87.14%，而NiWO为82.22%。后者较低的电化学性能被确定是由循环过程中的氧化还原行为导致的。NiWO在碱性溶液中发生反应，并在电极上形成由WO组成的钝化层，而相比之下，NiMoO的氧化还原行为是完全可逆的。
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