Structural, electronic, and electrocatalytic evaluation of spinel transition metal sulfide supported reduced graphene oxide

Abstract

Development of highly active and durable non-precious spinel transition metal sulfide (STMS)-based electrocatalysts plays a vital role in increasing the efficiency of hydrogen production via water electrolysis. Herein, we have...

Developing Outstanding Bifunctional Electrocatalysts for Rechargeable Zn‐Air Batteries Using High‐Purity Spinel‐Type ZnCo2Se4 Nanoparticles

“…Unfortunately, previously mentioned precious metal‐based electrocatalysts (Pt‐C, IrO 2 ) cannot meet such needs. [ 6 ] Numerous materials have demonstrated excellent promise with dual functions for ORR/OER over the past decade, including heteroatom‐doped carbon, [ 7 ] metal phosphide, [ 8 ] spinel oxides, [ 9 ] and sulfides, [ 10 ] hydrogels, [ 11 ] and their composites. [ 12 ]…”

“…[ 15 ] The inclusion of Zn atoms changes the occupied state (Co 2+/3+ ) in order to increase the electrochemical activity. [ 10,16,17 ] Additionally, this also initiates the electronic interactions between cations and anions. [ 18 ] Metallic selenides show remarkable OER/ORR activity because of their high redox‐active reaction properties.…”

Efficient Alkaline Water/Seawater Electrolysis by Development of Ultra-Low IrO2 Nanoparticles Decorated on Hierarchical MnO2/rGO Nanostructure

“…The intensity of the lattice oxygen was reduced in IrO 2 @MnO 2 /rGO compared with MnO 2 /rGO, which enhances the activity of iridium and the conductivity of the electrocatalyst. , However, the increase in the intensity of the surface-adsorbed oxygenated species (O 2– ) led to greater surface activity or larger electrochemical surface areas. The electronegativity of Mn (Pauling electronegativity is 1.5) is lower than that of Ir (Pauling electronegativity is 2.2), in such case the oxygen is more inclined to gain an electron from manganese . This was also confirmed by the deconvoluted O 1s spectra compared between commercial IrO 2 , MnO 2 /rGO, and IrO 2 @MnO 2 /rGO with peaks at 529.7, 529.4, and 529.5 eV, respectively (Figure S7).…”

“…Several lines of research have taken one or two of these strategies into account by introducing transition metals such as Ni, , Fe, or by synthesizing iridium-supported NiCo 2 O 4 and IrO 2 /TiO 2 , targeted to reduce the iridium content. Transition-metal-based oxides, phosphides, , and sulfides have been used in recent years to create efficient bifunctional electrocatalysts for water-splitting applications. − Additionally, the partial oxidation of the electrocatalyst during the reaction which affects the long-term stability can be overcome by using oxide-based catalysts.…”

Recent advances in hollow nanomaterials with multiple dimensions for electrocatalytic water splitting

“…In recent years, many efficient electrode materials have been proposed, such as transition metal hydroxides, 12–14 oxides, 15 chalcogenides, 16 phosphides 17 and nitrides 18 that can effectively improve the oxygen evolution reaction (OER) and transition metal alloys, 19 chalcogenides, 20,21 phosphides 22 and carbides 23 that enhance hydrogen evolution reaction (HER) activity. There are two main strategies to improve the performance of catalysts.…”