Back to Search
Start Over
Boosting oxygen evolution reaction rates with mesoporous Fe-doped MoCo-phosphide nanosheets.
- Source :
-
RSC advances [RSC Adv] 2024 Mar 27; Vol. 14 (15), pp. 10182-10190. Date of Electronic Publication: 2024 Mar 27 (Print Publication: 2024). - Publication Year :
- 2024
-
Abstract
- Transition metal-based catalysts are commonly used for water electrolysis and cost-effective hydrogen fuel production due to their exceptional electrochemical performance, particularly in enhancing the efficiency of the oxygen evolution reaction (OER) at the anode. In this study, a novel approach was developed for the preparation of catalysts with abundant active sites and defects. The MoCoFe-phosphide catalyst nanosheets were synthesized using a simple one-step hydrothermal reaction and chemical vapor deposition-based phosphorization. The resulting MoCoFe-phosphide catalyst nanosheets displayed excellent electrical conductivity and a high number of electrochemically active sites, leading to high electrocatalytic activities and efficient kinetics for the OER. The MoCoFe-phosphide catalyst nanosheets demonstrated remarkable catalytic activity, achieving a low overpotential of only 250 mV to achieve the OER at a current density of 10 mA cm <superscript>-2</superscript> . The catalyst also exhibited a low Tafel slope of 43.38 mV dec <superscript>-1</superscript> and maintained high stability for OER in alkaline media, surpassing the performance of most other transition metal-based electrocatalysts. The outstanding OER performance can be attributed to the effects of Mo and Fe, which modulate the electronic properties and structures of CoP. The results showed a surface with abundant defects and active sites with a higher proportion of Co <superscript>2+</superscript> active sites, a larger specific surface area, and improved interfacial charge transfer. X-ray photoelectron spectroscopy (XPS) analysis revealed that the catalyst's high activity originates from the presence of Mo <superscript>6+</superscript> /Mo <superscript>4+</superscript> and Co <superscript>2+</superscript> /Co <superscript>3+</superscript> redox couples, as well as the formation of active metal (oxy)hydroxide species on its surface.<br />Competing Interests: The authors declare no conflict of interest.<br /> (This journal is © The Royal Society of Chemistry.)
Details
- Language :
- English
- ISSN :
- 2046-2069
- Volume :
- 14
- Issue :
- 15
- Database :
- MEDLINE
- Journal :
- RSC advances
- Publication Type :
- Academic Journal
- Accession number :
- 38544941
- Full Text :
- https://doi.org/10.1039/d4ra00146j