Abstract
This study illustrates the catalytic hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities of the hexagonal NiO nanosheets on Ni-foam. The NiO electrocatalyst demonstrates the low overpotentials of 83 mV/380 mV and low Tafel slopes of 209 mV dec−1/299 mV dec−1 during HER/OER, respectively. It also reveals excellent stability, showing a slight change in overpotentials of 116 mV and 430 mV during HER/OER after 2000 CV cycles. Electrochemical impedance spectroscopy spectra show the series resistance of 0.83 Ω/1.04 Ω and charge-transfer resistance of 1.63 Ω/4.70 Ω during HER/OER after 2000 CV cycles.
Original language | English |
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Article number | 132740 |
Journal | Materials Letters |
Volume | 324 |
DOIs | |
State | Published - 1 Oct 2022 |
Keywords
- Hexagonal NiO nanosheets
- Hydrogen evolution reaction
- Oxygen evolution reaction
- Stability
- Water splitting