Selenide‐Based Electrocatalysts and Scaffolds for Water Oxidation Applications

Abstract

Selenide-based electrocatalysts and scaffolds on carbon cloth are successfully fabricated and demonstrated for enhanced water oxidation applications. A max-imum current density of 97.5 mA cm(-2) at an overpotential of a mere 300 mV and a small Tafel slope of 77 mV dec(-1) are achieved, suggesting the potential of these materials to serve as advanced oxygen evolution reaction catalysts.

Engineering the Electrical Conductivity of Lamellar Silver‐Doped Cobalt(II) Selenide Nanobelts for Enhanced Oxygen Evolution

“…[34] Specific to the Ag-CoSe 2 catalyst in this study,t he generation of surface active sites could be facilitated owing to significantly improved electron transport, leading to more Co IV sites and consequently promoted OER rate.O nt he other side,t he cation exchange between Co 2+ and Ag + could negatively influence the Co IV generation considering af raction of Co 2+ being replaced by Ag + .W em easured electrochemical active surface area (ECSA), which is representative of Co 2+ amount, of the catalysts for examining this effect. Previous mechanistic studies have discovered that the real active sites of Co-based OER catalyst are the Co IV .T hese active sites are generated in situ prior to OER process through at ypical oxidation process,i nw hich Co II is oxidized to Co III and Co IV .…”

Strong Electronic Interaction in Dual‐Cation‐Incorporated NiSe2 Nanosheets with Lattice Distortion for Highly Efficient Overall Water Splitting

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focuses on exploration of efficient electrocatalysts that can overcome the sluggish kinetics and accelerate the evolution rates of H 2 and O 2 at low overpotentials. [11,12] In this content, the development of bifunctional catalysts which are highly active for both HER and OER in the same medium is highly desirable for overall water splitting.Accordingly, great efforts have been paid to developing bifunctional electrocatalysts based on transition metal nanomaterials and their derivatives, including metal oxides or hydroxides, [13,14] metal chalcogenides, [15][16][17] metal nitrides, [18,19] and metal phosphides. However, most of the recently developed HER and OER catalysts work in either acidic or alkaline medium.

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“…Accordingly, great efforts have been paid to developing bifunctional electrocatalysts based on transition metal nanomaterials and their derivatives, including metal oxides or hydroxides, [13,14] metal chalcogenides, [15][16][17] metal nitrides, [18,19] and metal phosphides. [20,21] Among these noble metal-free materials, transition metal selenides with a suitable d-electron configuration are regarded as the promising candidates.…”

Pseudomorphic Transformation of Interpenetrated Prussian Blue Analogs into Defective Nickel Iron Selenides for Enhanced Electrochemical and Photo‐Electrochemical Water Splitting

“…At an overpotential of 100 mV for HER (Figure 4c NiFeSe@NiSe|O@CC. [20] The XPS investigations of post-OER catalyst obviously show that surface selenide phase is partly transformed into oxyhydroxide phase, unveiling a surface composition change under the oxidative conditions of OER. It should be noted that, compared to TOFs calculated for HER, the order of magnitude improvement is smaller in the TOFs calculated for OER, although similar ECSA values are obtained for both hydrogen and oxygen evolution reactions (Figure 4a,b).…”