For green-hydrogen production through a promising electrolytic water splitting, cobalt phosphide is in the spotlight as one of the new affordable materials to replace currently used noble-metal catalysts. In this study, we fabricate hollow cobalt phosphide (CoP) nanofibers with advanced nanostructure using electrospinning and phosphidation. Due to their unique architecture and oxygen-rich surface characteristics, the novel hollow-structure CoP nanofibers effectively increase hydrogen evolution reaction catalytic activity with the low overpotentials of 91 mV (for acid) and 63 mV (for alkaline). Using in situ Raman spectroscopy, it is confirmed that high-oxygen-containing CoP catalysts could transform the CoOOH phase under alkaline conditions, which offer faster water dissociation kinetics. Furthermore, CoP nanofibers exhibited excellent durability even after 30000th accelerated degradation test cycles and overall water splitting for 40 h.
Bibliographical noteFunding Information:
Korea University Grant; Ministry of Science and ICT, South Korea, Grant/Award Numbers: 2020R1A6A1A03045059, 2021M3H4A1A03057403, 2021M3D1A2051636; National Research Foundation of Korea Funding information
This work is supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, South Korea (2021M3D1A2051636, 2021M3H4A1A03057403, 2020R1A6A1A03045059). This work is also supported by a Korea University Grant.
© 2022 John Wiley & Sons Ltd.
- cobalt phosphide
- hollow structure
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering
- Fuel Technology
- Energy Engineering and Power Technology