Amorphous MoS_x developed on Co(OH)₂ nanosheets generating efficient oxygen evolution catalysts

Abstract

aMoSx/Co(OH)2 nanosheets were synthesized by forming amorphous MoSx on Co(OH)2 nanosheets. The aMoSx/Co(OH)2 nanosheets demonstrate excellent OER catalytic activity with only 350 mV at 10 mA cm−2. The incorporation of amorphous molybdenum sulfide enhances the hydrophilicity, favoring the availability of reactant, and induces electron transfer for enhancing the OER catalytic activity of Co(OH)2.

Cobalt‐Vanadium Hydroxide Nanoneedles with a Free‐Standing Structure as High‐Performance Oxygen Evolution Reaction Electrocatalysts

“…We also note that the Co 2p 3/2 XPS spectra of NF@Co 0.75 V 0.25 ‐HNNs has a higher characteristic satellite at 786.7 eV than that of NF@Co‐HNNs, indicating the dominant Co 2+ existing in the NF@Co 0.75 V 0.25 ‐HNNs, because the incorporation of V 3+ takes the partial position of Co 3+ . Further, all the peaks for Co 2p in NF@Co 0.75 V 0.25 ‐HNNs shift toward lower BEs compared with those in NF@Co‐HNNs, indicating an increase of electronic density in NF@Co‐HNNs after the incorporation of V . The O 1s spectra of NF@Co‐HNNs are fitted to three dominant oxygen species, including CO 3 2− , OH − , and Co−O, depending on the post‐processing conditions, while an extra peak assigned to V−O is observed in the O 1s spectra of NF@Co 0.75 V 0.25 ‐HNNs (Figure f).…”

Earth‐Abundant Amorphous Electrocatalysts for Electrochemical Hydrogen Production: A Review

“…In amorphous monometallic Co [19,117] and Mo [118] sulfides, the OER performance is primarily driven by the metal-sulfur dangling bonds. The presence of SO 4 2À ions also helps to boost the material's hydrophilicity, allowing better electrolyte-electrocatalyst contact to greatly facilitate OER reactions.…”

NiFe‐Based Metal–Organic Framework Nanosheets Directly Supported on Nickel Foam Acting as Robust Electrodes for Electrochemical Oxygen Evolution Reaction

“…Therefore, water splitting with zero carbon emission is regarded as an environmentally friendly option to generate oxygen and hydrogen as clean fuels sources to relieve the energy crisis problem . Yet, the oxygen evolution reaction (OER), a bottleneck half‐reaction involved with multistep proton‐coupled electron transfer at the anode, required the large overpotential (η) to overcome the sluggish kinetically and hindered practical utilization of water splitting technology . Efficient catalysts should be designed and synthesized to decrease the overpotential and accelerate the kinetically for the OER.…”

“…Over the last few decades, extensive attentions have been paid to earth‐abundant and cost‐efficient (3d) transition metal–based alternatives . Apart from the well‐developed metal oxides and (oxy)hydroxides catalysts, metal selenide, nitride, phosphide, boride, and chalcogenide materials have also attracted large research attention for designing excellent OER electrocatalysts .…”