Laser Shock Fabrication of Nitrogen Doped Inverse Spinel Fe<sub>3</sub>O<sub>4</sub>/Carbon Nanosheet Film Electrodes towards Hydrogen Evolution Reactions in Alkaline Media
The reliable and cost-effective production of high-performance film electrodes for hydrogen evolution reactions remains a challenge for the laser surface modification community. In this study, prior to a thermal imidization reaction, a small number of Fe<sub>3</sub>O<sub>4</sub&...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-07-01
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| Series: | International Journal of Molecular Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1422-0067/23/13/7477 |
| Summary: | The reliable and cost-effective production of high-performance film electrodes for hydrogen evolution reactions remains a challenge for the laser surface modification community. In this study, prior to a thermal imidization reaction, a small number of Fe<sub>3</sub>O<sub>4</sub> nanoparticles were vortexed into a poly(amic acid) (PAA) prepolymer, and the achieved flat composite film was then ablated by a 1064 nm fiber laser. After laser irradiation, the hierarchical architectures of carbon nanosheets decorated with Fe<sub>3</sub>O<sub>4</sub> nanoparticles were generated. Although pure polyimide (PI) film and laser carbonized PI film, as well as bare Fe<sub>3</sub>O<sub>4</sub>, showcase poor intrinsic catalytic activity toward alkaline hydrogen evolution reactions, our laser-derived Fe<sub>3</sub>O<sub>4</sub>/carbon nanosheet hybrid film demonstrated enhanced electrocatalytic activity and stability in 1 M KOH electrolyte; the overpotential(η<sub>10</sub>) reached 247 mV when the current density was 10 mA cm<sup>−2</sup> with a slight current decay in the chronoamperometric examination of 12 h. Finally, we proposed that the substitution of N to O in Fe−O sites of trans spinel structured magnetite would be able to modulate the free energy of hydrogen adsorption (ΔG<sub>H*</sub>) and accelerate water dissociation. |
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| ISSN: | 1661-6596 1422-0067 |