In this study, heterogeneous nickel phosphide‐nickel selenide (Ni2P‐NiSe2) nanosheets are constructed to coat zinc phosphide‐based nanorods (ZnP NRs) under a unique core@shell architecture, which acts as a highly active multifunctional catalyst toward hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The catalyst exhibits an overpotential of 79 mV at 10 mA cm–2 for HER and 326 mV at 100 mA cm–2 for OER in freshwater under an alkaline condition. The formation of an open 3D channel architecture derived from highly conductive ZnP@Ni2P‐NiSe2 nanorods attached nickel foam generates more exposed active sites and promotes fast mass transport. In addition, density functional theory study reveals a synergistic effect between Ni2P and NiSe2 phase to reduce adsorption free energy and increase the electronic conductivity, thereby accelerating the catalytic reaction kinetics. An electrolyzer of the ZnP@Ni2P‐NiSe2(+,‐) requires only cell voltages of 1.54 V (1.43 V) and 1.51 V (1.44 V) to deliver 10 mA cm–2 in freshwater and mimic seawater at 25 °C (75 °C), respectively, along with prospective long‐term stability. Furthermore, the solar energy‐assisted water splitting process demonstrates a solar‐to‐hydrogen efficiency of 19.75%, implying that the catalyst is an effective and low‐cost candidate for water splitting.
Designing an earth-abundant electrode material with high activity and durability is a major challenge for water splitting to produce clean and green hydrogen energy. In this study, we reported a...
A novel
sulfur-doped vanadium–molybdenum oxide nanolayer
shelling over two-dimensional cobalt nanosheets (2D Co@S-VMoO
x
NSs) was synthesized via a facile approach.
The formation of such a unique 2D core@shell structure together with
unusual sulfur doping effect increased the electrochemically active
surface area and provided excellent electric conductivity, thereby
boosting the activities for hydrogen evolution reaction (HER) and
oxygen evolution reaction (OER). As a result, only low overpotentials
of 73 and 274 mV were required to achieve a current response of 10
mA cm–2 toward HER and OER, respectively. Using
the 2D Co@S-VMoO
x
NSs on nickel foam as
both cathode and anode electrode, the fabricated electrolyzer showed
superior performance with a small cell voltage of 1.55 V at 10 mA
cm–2 and excellent stability. These results suggested
that the 2D Co@S-VMoO
x
NSs material might
be a potential bifunctional catalyst for green hydrogen production
via electrochemical water splitting.
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