Journal
ELECTROCHIMICA ACTA
Volume 318, Issue -, Pages 762-769Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.06.128
Keywords
NiCo2O4; Porous nanotubes; Water-splitting; Template-free method; Bifunctional electrocatalyst
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Funding
- National Natural Science Foundation of China [51571087]
- Natural Science Foundation of Hunan Province [2019JJ40028]
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NiCo2O4 porous nanotubes as the earth abundant and efficient bifunctional electrocatalyst were successfully synthesized via the template-free method involving the hydrothermal process and subsequent heat treatment Benefiting from the porous nanotube structure and the template-free method, they show a superior low charge transfer resistance and more exposed active sites. With those advantages, the NiCo2O4 porous nanotubes show an outstanding electrocatalytic performance with an overpotential of 264 mV at j = 20 mA cm(-2) for oxygen evolution reaction and 106.5 mV at j = 10 mA cm(-2) for hydrogen evolution reaction, respectively. More significantly, the NiCo2O4 porous nanotubes show a potential of 1.63 V at j = 20 mA cm(-2) for overall water-splitting, and there is no obvious change after running for 12 h. In a word, this work offers a novel routine for fabricating NiCo2O4 porous nanotubes with excellent electrocatalytic performance and durability for overall water-splitting. (C) 2019 Elsevier Ltd. All rights reserved.
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