Ceramic electrodes are cost-effective and stable at high
current
densities. Thus, they are highly considered for industrial hydrogen
production. In this study, a novel self-supported MoO2/MoSi2 ceramic electrode, with open finger-like holes and excellent
electrochemical performance, was successfully prepared by phase-inversion,
the shaping method of tape-casting, and hydrothermal treatment. The
obtained MoO2/MoSi2 electrode has a lower overpotential
than the Pt/C electrode at current densities greater than 330 and
410 mA cm–2 in an alkaline and acidic environment,
respectively. Furthermore, the electrode exhibits excellent stability
at 10–1000 mA cm–2 for 260 h in both alkaline
and acidic solutions. Density functional theory calculations showed
that the MoO2/MoSi2 heterostructure displays
the lowest H adsorption free energy and the highest density of states
around the Fermi level.
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