Abstract
Developing efficient, multifunctional electrodes for energy storage and conversion devices is crucial. Herein, lattice strains are reported in the β-phase polymorph of CoMoO4 within CoMoO4@Co3O4 heterostructure via phosphorus doping (P-CoMoO4@Co3O4) and used as a high-performance trifunctional electrode for supercapacitors (SCs), hydrogen evolution reaction (HER), and oxygen evolution reaction (OER) in alkaline electrolytes. A tensile strain of +2.42% on the β-phase of CoMoO4 in P-CoMoO4@Co3O4 results in superior electrochemical performance compared to CoMoO4@Co3O4. The optimized P-CoMoO4@Co3O4 achieves a high energy density of 118Wh kg-1 in an asymmetric supercapacitor and low overpotentials of 189mV for the HER and 365mV for the OER at a current density of 500mA cm-2. This results in a low overall water splitting voltage of 1.71V at the same current density making it an effective bifunctional electrode in a 1m KOH freshwater electrolyte. Theoretical analysis shows that the excellent performance of P-CoMoO4@Co3O4 can be attributed to interfacial interactions between CoMoO4 and Co3O4, and the β-phase of CoMoO4, which lead to strong OH- adsorption and low energy barriers for reaction intermediates. Practical application is demonstrated by using P-CoMoO4@Co3O4-based ASCs to self-generate hydrogen (H2) in a P-CoMoO4@Co3O4||P-CoMoO4@Co3O4 alkaline seawater electrolyzer, showcasing its potential for future energy technologies.
Published Version
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