Enhanced electrocatalytic efficiencies for water electrolysis and para-nitrophenol hydrogenation by self-supported nickel cobalt phosphide-nickel iron layered double hydroxide p-n junction

[Display omitted] •Self-supported p-n junction catalytic electrode was prepared by electrodeposition.•Efficient charge redistribution occurred within the p-n junction.•Decent OER, HER and 4-NP hydrogenation performances were ensured.•H2 production and hydrogenation valorization of 4-NP were fulfille...

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Veröffentlicht in:Journal of colloid and interface science 2024-01, Vol.653, p.1063-1074
Hauptverfasser: Chang, Jiuli, Song, Fengfeng, Xu, Fang, Wu, Dapeng, Hou, Yan, Jiang, Kai, Guo, Yuming, Gao, Zhiyong
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Sprache:eng
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Zusammenfassung:[Display omitted] •Self-supported p-n junction catalytic electrode was prepared by electrodeposition.•Efficient charge redistribution occurred within the p-n junction.•Decent OER, HER and 4-NP hydrogenation performances were ensured.•H2 production and hydrogenation valorization of 4-NP were fulfilled by catalysis. Charge redistribution across heterointerfaces is an important tactic to enhance the catalytic activities and bifunctionality of hybrid catalysts, especially for green hydrogen production from water electrolysis and harmless electrocatalytic valorization of organics. Herein, a self-supported p-n junction catalytic electrode was constructed by tandem electrodeposition of nickel cobalt phosphide (NiCoP) and nickel iron layered double hydroxide (NiFe LDH) onto Ni foam (NF) substrate, denoted as NiCoP@NiFe LDH/NF, to enhance the electrocatalytic capabilities for water electrolysis and hydrogenation of an organic, para-nitrophenol (4-NP). Benefitting from the charge redistribution across the p-n junction, high electrocatalytic efficiencies for oxygen evolution reaction (OER, overpotential of 388 mV at 100 mA cm−2) and hydrogen evolution reaction (HER, overpotential of 132 mV at 10 mA cm−2) could be achieved concurrently by the NiCoP@NiFe LDH/NF electrode, and both overpotentials were located within the mainstream levels in this domain. The bifunctional catalytic features enabled a full water electrolysis response of 10 mA cm−2 at 1.61 V. In addition, the p-n junction electrode catalyzed the hydrogenation of 4-NP at a conversion of 100%, para-aminophenol (4-AP) selectivity of 90% and faradaic efficiency (FE) of 88% at −0.18 V. The current work offers a feasible strategy for fulfilling electrochemical H2 production and hydrogenation valorization of 4-NP pollutant by constructing a self-supported p-n junction catalytic electrode.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2023.09.156