Doping Mo into NiFe LDH/NiSe Heterostructure to Enhance Oxygen Evolution Activity by Synergistically Facilitating Electronic Modulation and Surface Reconstruction

Abstract

It is of great significance to design highly efficient electrocatalysts with abundant earth elements instead of precious metals for water splitting. Herein, Mo‐doped NiFe‐layered double hydroxides/NiSe heterostructure (Mo‐NiFe LDH/NiSe) was fabricated by coupling Mo‐doped NiFe LDH and NiSe on nickel foam (NF). The heterostructure electrocatalyst showed ultra‐low overpotential (250 mV) and remarkable durability for oxygen evolution reaction (OER) at 150 mA cm−2. Both theoretical and experimental results confirmed that Mo doping and interfacial synergism induced the interfacial charge redistribution and the lifted d‐band center to weaken the energy barrier (EB) of the formation of OOH*. Mo doping also facilitated the surface reconstruction of NiFe LDH into Ni(Fe)OOH as the active sites under electro‐oxidation process. This work provides a facile strategy for electronic modulation and surface reconstruction of OER electrocatalyst by transition metal doping and heterostructure generation.

Machine learning-assisted optimization of multi-metal hydroxide electrocatalysts for overall water splitting

“…In addition, prior literature also suggest that Mo doping could induce redistribution of the surface electron density to accelerate charge transfer and promote the formation of the *OOH intermediate for NiFe LDH structures as well. 11,68,71,75 Congruent with these prior observations, NN-12 also exhibits significantly lower charge transfer resistance ( R ct ) than the original NiFe LDH, 39 as observed from electrochemical impedance spectroscopy (Fig. S5.4, ESI†).…”

Effective regulation on catalytic performance of nickel–iron–vanadium layered double hydroxide for urea oxidationviasulfur incorporation

“…It can be clearly observed that there is an obvious response to the oxygen evolution reaction process for the S-NiFeV LDH electrode in 1.0 M KOH solution without urea, which originates from the oxidation peak of the Ni species (Ni 2+ /Ni 3+ ). 54–57 Depicted in Fig. 5(b) are the LSV curves of the S-NiFeV LDH, NiFeV LDH, and NiFe LDH for the UOR, along with those of the commercial RuO 2 and bare NF as a contrast.…”

Enhancement of the triiodide reduction reaction by doping molybdenum in NiSe hierarchical microspheres: a theoretical and experimental study

“…metals endows heteroatom-doped compounds with uncommon catalytic activity due to the unusual d-band electron complementary effect. [37][38][39] Encouraged by the above, coordinating nickel selenide by Mo doping and simultaneously modulating accessible micro/nanostructures seem to be an effective strategy to further improve IRR activity.…”