Surface Activation and Ni‐S Stabilization in NiO/NiS₂for Efficient Oxygen Evolution Reaction

Abstract

Manipulating the active species and improving the structural stabilization of sulfur-containing catalysts during the OER process remain a tremendous challenge. Herein, we constructed NiO/NiS 2 and FeÀ NiO/NiS 2 as catalyst models to study the effect of Fe doping. As expected, FeÀ NiO/NiS 2 exhibits a low overpotential of 270 mV at 10 mA cm À 2 . The accumulation of hydroxyl groups on the surface of materials after Fe doping can promote the formation of highly active NiOOH at a lower OER potential. Moreover, we investigated the level of corrosion of MÀ S bonds and compared the stability variation of MÀ S bonds with Fe at different locations. Interestingly, Fe bonded with S in the bulk as the sacrificial agent can alleviate the oxidation corrosion of partial NiÀ S bonds and thus endow FeÀ NiO/NiS 2 long-term durability. This work could motivate the community to focus more on resolving the corrosion of sulfur-containing materials.

Iron-doped novel Co-based metal–organic frameworks for preparation of bifunctional catalysts with an amorphous structure for OER/HER in alkaline solution

“…It is worth noting that the addition of Fe is beneficial to decreasing the charge transfer resistance of the interfacial charge transfer of the catalyst, but too much Fe doping leads to severe lattice distortion, which weakens this effect. 61…”

“…It is worth noting that the addition of Fe is beneficial to decreasing the charge transfer resistance of the interfacial charge transfer of the catalyst, but too much Fe doping leads to severe lattice distortion, which weakens this effect. 61 In addition, in the electrocatalytic OER process, the adsorption of OH − ions by the catalyst is crucial in the kinetic process. The zeta potential of the material was measured to reasonably evaluate the surface potential of the Co-MOF block and series of Fe@Co-MOFs, so as to further analyze the mechanism of catalyst OER in an alkaline environment.…”

Three novel coordination polymers as bifunctional materials for the photocatalytic degradation of dyes and the oxygen evolution reaction in alkaline solutions

“…24 Water electrolysis is one of the most feasible ways to produce hydrogen energy, but in actual production, the half-reaction of water electrolysis requires a certain overpotential to overcome the thermodynamic equilibrium potential. 25,26 Currently, noble metal oxides IrO 2 , RuO 2 , and Pt-based materials have been considered benchmarks for electrocatalysts in commercial applications. 27,28 However, general problems such as high cost, scarcity, poor stability, and non-toxicity limit the widespread application of these commercial electrocatalysts in the field of electrocatalysis.…”

Surface nitriding to improve the catalytic performance of FeNi3 for the oxygen evolution reaction

“…25 In conclusion, the above findings are attributed to dynamically reconfigured oxyhydroxides on the surface and, according to most literature reports, the formation of oxyhydroxides is beneficial for the OER performance. 26,27 In conclusion, we prepared nitrogen-doped FeNi 3 alloys via surface nitridation. With surface nitridation forming amorphous Fe/Ni-N x at the edges of the alloy nanosheets, and benefiting from the Fe/Ni-N x species and FeNi 3 nanoparticles being OER active components with multi-component active sites and the encapsulation effect of Fe/Ni-N x inhibiting the leaching of alloy active sites, nitrogen-doped FeNi 3 exhibits an excellent OER activity in an alkaline environment.…”

“…25 In conclusion, the above findings are attributed to dynamically reconfigured oxyhydroxides on the surface and, according to most literature reports, the formation of oxyhydroxides is beneficial for the OER performance. 26,27…”