Article Synopsis
- Transition metal oxides have shown potential as electrocatalysts for energy and environmental uses, with recent findings highlighting the role of lattice oxygen in surface reactions.
- Researchers developed a sacrificial template method to create Mo-doped NiFe (oxy)hydroxide with enhanced oxygen activity, achieving a high mass activity of 1910 A/g at a 300 mV overpotential.
- The study combines theoretical and experimental techniques to reveal that the Mo dopant improves electrocatalytic performance by altering the electronic structure and promoting oxygen vacancy formation in the material.
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Article Abstract
Transition metal oxides or (oxy)hydroxides have been intensively investigated as promising electrocatalysts for energy and environmental applications. Oxygen in the lattice was reported recently to actively participate in surface reactions. Herein, we report a sacrificial template-directed approach to synthesize Mo-doped NiFe (oxy)hydroxide with modulated oxygen activity as an enhanced electrocatalyst towards oxygen evolution reaction (OER). The obtained MoNiFe (oxy)hydroxide displays a high mass activity of 1910 A/g at the overpotential of 300 mV. The combination of density functional theory calculations and advanced spectroscopy techniques suggests that the Mo dopant upshifts the O 2p band and weakens the metal-oxygen bond of NiFe (oxy)hydroxide, facilitating oxygen vacancy formation and shifting the reaction pathway for OER. Our results provide critical insights into the role of lattice oxygen in determining the activity of (oxy)hydroxides and demonstrate tuning oxygen activity as a promising approach for constructing highly active electrocatalysts.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9023528 | PMC |
| http://dx.doi.org/10.1038/s41467-022-29875-4 | DOI Listing |
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