Tuning polyoxometalate composites with carbonaceous materials towards oxygen bifunctional activity

Abstract

Oxygen electrochemistry plays an imperative role in a renewable energy systems. Development of non-precious metal and efficient bifunctional catalyst for oxygen reduction and oxygen evolution reaction (ORR & OER) is...

Selective Electrochemical Production of Hydrogen Peroxide from Reduction of Oxygen on Mesoporous Nitrogen Containing Carbon

“…[24][25][26][27] Despite of all the advantages, carbon-based catalysts are known to exhibit significant advantages over them. [28][29][30] They are sustainable and environmental friendly, contain large surface area, ordered structure, porosity, cost effectiveness, high conductivity, high abundance in earth and defects which provide enhanced activity. [29][30][31][32] By virtue of these fascinating properties, several carbon based catalysts with different morphology, porosity and heteroatom doping are being explored as an electrocatalyst for high yield production of H 2 O 2 .…”

“…[28][29][30] They are sustainable and environmental friendly, contain large surface area, ordered structure, porosity, cost effectiveness, high conductivity, high abundance in earth and defects which provide enhanced activity. [29][30][31][32] By virtue of these fascinating properties, several carbon based catalysts with different morphology, porosity and heteroatom doping are being explored as an electrocatalyst for high yield production of H 2 O 2 . [9] In this regards, heteroatom doping into carbon framework is an efficient way to improve the activity by creation of several defects and thus tuning the electronic properties.…”

“…[9] In this regards, heteroatom doping into carbon framework is an efficient way to improve the activity by creation of several defects and thus tuning the electronic properties. [16,30,33] However, the catalytic activity and performance of nitrogen doped carbonaceous catalyst is not as good as transition metal catalyst. [34,35] Hence, in addition to heteroatom doping, the size of pores in carbonaceous material also influences the production of H 2 O 2 .…”

Nickel Iron Phosphide/Phosphate as an Oxygen Bifunctional Electrocatalyst for High-Power-Density Rechargeable Zn–Air Batteries

“…Among the various candidates, transition-metal (TM)-based catalysts have gained importance due to their low cost, abundant resources, and superior electrocatalytic activity. Typically, transition-metal-based layer double hydroxides, chalcogenides, oxides, perovskites, phosphides, and molecular catalysts have been intensively exploited as promising oxygen electrocatalysts. Among them, transition-metal phosphides and phosphates appeared to be promising catalysts because of high conductivity, stability, better corrosion resistivity, and high metallic density. − Recently, nickel-based phosphides/phosphates have enticed widespread research interest − due to their unique e g orbitals , and weak Ni–OH bond strength. − However, a monometallic Ni system often needs modification for enhancing their activity.…”

Polyoxometalate@ZIF Induced CoWO4/WS2@C-N Nanoflower as a Highly Efficient Catalyst for Zn–Air Batteries

“…In 2020, Han et al investigated the studies focusing on POM derivatives for rechargeable batteries . To date, limited POMs or their derivatives were successfully employed as electrochemical activators. − For instance, ZnPOM or CoPOM with polyvinylidene-butyl-imidazolium cation supported on carbon materials as a bifunctional catalyst have been studied for multifunctional electrocatalysts. , Recently, the study explores the earth-abundant cobalt tungstate (CoWO 4 ), a new class of inorganic material as a viable alternative electrocatalyst . Individually, a sandwich-type POM, Na 10 [Co 4 (H 2 O) 2 (α-PW 9 O 34 ) 2 ], confirmed its ability to transform into CoWO 4 -based nanoparticles with enhancing OER activity, whose overpotential (392 mV) is determined at the current density of 10 mA cm –2 .…”