Macroporous CoO@Co/N-doped graphitic carbon nanosheet arrays were constructed by engineering a mesoporous CoO nanowire core with a highly conductive Co/NGC shell, and this approach will provide a promising strategy to construct highly effective bifunctional electrocatalysts.
Searching for an
economical and efficient water splitting electrocatalyst is still
a huge challenge for hydrogen production. This work reports one-step
synthesis of hierarchical porous prism arrays (HPPAs) composed of
Ni–NiO nanoparticles embedding uniformly in graphite carbon
(Ni–NiO/C HPPAs), which is derived from metal–organic
framework (CPO-27-Ni) prism arrays grown on nickel foam (NF). Remarkable
features of the prism arrays, synergistic effect of Ni–NiO/C,
porous graphite carbon, high conductive NF, and good contact between
catalyst and current collector result in excellent electrocatalytic
performance of Ni–NiO/C HPPAs@NF. Ni–NiO/C HPPAs@NF
shows a small overpotential of ∼49.48 mV at the current density
of 10 mA cm–2, low Tafel slope of 74 mV dec–1 and robust stability for hydrogen evolution reaction
(HER) in alkaline media. Especially, the overpotential for HER of
Ni–NiO/C HPPAs@NF is only ∼132 mV at the current density
of 185 mA cm–2, almost the same as the value from
the Pt/C. Furthermore, for oxygen evolution reaction in basic media,
Ni–NiO/C HPPAs@NF shows better catalytic activity, lower Tafel
slope and higher durability than precious IrO2. The above
finding offers an effective strategy to design the bifunctional electrocatalysts
for overall water splitting.
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