Cobalt-based hydroxide are ideal candidates for the oxygen evolution reaction. Herein, we use molybdenum oxide nanorods as sacrificial templates to construct a self-supporting molybdenum-doped cobalt hydroxide nanosheet hierarchical microtubule structure based on a structural engineering strategy to improve the active area of the catalyst. X-ray-based spectroscopic tests revealed that Mo (VI) with tetrahedral coordination intercalated into the interlayer of cobalt hydroxide, promoting interlayer separation. At the same time, Mo is connected with Co through oxygen bonds, which promotes the transfer of Co charges to Mo and reduces the electron cloud density of Co ions. In 1 M KOH, optimized molybdenum-doped cobalt hydroxide nanosheet microtubules only needs an overpotential of 288 mV to drive a current density of 10 mA cm, which is significantly better than that of pure Co(OH) nanosheets and RuO. Structural engineering and electronic state regulation can effectively improve the oxygen evolution activity of cobalt-based hydroxide, which provides a design idea for the development of efficient oxygen evolution catalysts.
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| http://dx.doi.org/10.1016/j.jcis.2022.08.069 | DOI Listing |
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Article Synopsis
- The intrinsic mechanisms of the oxygen evolution reaction (OER) remain complex and not fully understood, particularly how the arrangement of metal centers affects OER rates.
- Researchers developed cobalt hydroxide-based nanoboxes containing tetrahedrally coordinated Co(II) centers, which transform into active Co(IV) species during the OER process.
- The study highlights how the local geometry of metal centers influences the oxygen evolution kinetics, showing that partial iron incorporation enhances this activation, while traditional structures like CoOOH and Co-FeOOH limit the formation of active Co(IV) species.
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