Modulation of electronic structure of Ni3S2 via Fe and Mo co-doping to enhance the bifunctional electrocatalytic activities for HER and OER

Fe and Mo co-doped Ni3S2 nanorod array is in situ built on Ni foam using Keplerate polyoxomolybdate as precursor and performs efficiently for electrocatalytic overall water splitting, capable of achieving a low cell voltage of 1.60 V and Faradaic efficiency of nearly 100%. [Display omitted] •Free-st...

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Veröffentlicht in:Journal of colloid and interface science 2024-10, Vol.672, p.715-723
Hauptverfasser: Wang, Ting, Li, Bowen, Wang, Ping, Xu, Ming, Wang, Dandan, Wang, Yuqi, Zhang, Wenjing, Qu, Chaoqun, Feng, Ming
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Sprache:eng
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Zusammenfassung:Fe and Mo co-doped Ni3S2 nanorod array is in situ built on Ni foam using Keplerate polyoxomolybdate as precursor and performs efficiently for electrocatalytic overall water splitting, capable of achieving a low cell voltage of 1.60 V and Faradaic efficiency of nearly 100%. [Display omitted] •Free-standing Fe and Mo co-doped Ni3S2 nanorod array is in situ built on Ni foam using Keplerate polyoxomolybdate as precursor.•Fe-MoS2/Ni3S2@NF is reported first time for overall water splitting.•Fe and Mo co-doping modulates the electronic structure of Ni3S2 and induces abundant active sites.•Fe-MoS2/Ni3S2@NF attains a more exceptional electrochemistry improvement, faster electron transfer, better reaction kinetics and long-term durability. Heazlewoodite nickel sulfide (Ni3S2) is advocated as a promising nonnoble catalyst for electrochemical water splitting because of its unique structure configuration and high conductivity. However, the low active sites and strong sulfur–hydrogen bonds (S–Hads) formed on Ni3S2 surface greatly inhibit the desorption of Hads and reduce the hydrogen and oxygen evolution reaction (HER and OER) activity. Doping is a valid strategy to stimulate the intrinsic catalytic activity of pristine Ni3S2 via modifying the active site. Herein, the Ni foam supported Fe and Mo co-doped Ni3S2 electrocatalysts (Fe-MoS2/Ni3S2@NF) have been constructed using Keplerate polyoxomolybdate {Mo72F30} as precursor through a facile hydrothermal process. Experimental results certificate that Fe and Mo co-doping can effectively tune the local electronic structure, facilitate the interfacial electron transfer, and improve the intrinsic activity. Consequently, the Fe-MoS2/Ni3S2@NF display more excellent HER and OER activity than MoS2/Ni3S2@NF and bare Ni3S2@NF by delivering the 10 and 50 mA cm−2 current densities at ultra-low overpotentials of 74/175 and 80/160 mV for HER and OER. Moreover, when coupled in an alkaline electrolyzer, Fe-MoS2/Ni3S2@NF approached the current of 10 mA cm−2 under a cell voltage of 1.60 V and exhibit excellent stability. The strategy to realize tunable catalytic behaviors via foreign metal doping provides a new avenue to optimize the water splitting catalysts.
ISSN:0021-9797
1095-7103
1095-7103
DOI:10.1016/j.jcis.2024.06.079