Multi-functional O₂–H₂ electrochemistry by an abundant mineral: a novel and sustainable alternative for noble metals in electrolyzers and metal–air batteries

Abstract

Developing sustainable and efficient electrocatalysts for clean energy-based technologies would hasten the commercialization of high-power devices such as metal-air batteries, electrolyzers and fuel cells. With immense potential to root out...

On the concept of metal–hydrogen peroxide batteries: improvement over metal–air batteries?

“…By considering the scaling relations of eqn (17) and (18), We obtain for the energetics of the intermediate states:…”

“…A promising opportunity to overcome large BI values refers to the redox chemistry of hydrogen peroxide (H 2 O 2 ), as discussed by Siahrostami from the perspective of theory in a recent article [16]. The main idea is that the redox processes involving hydrogen peroxide consists only of two proton-electron transfer steps, thus resulting in smaller overpotentials compared to the four-electron bifunctional oxygen electrocatalysis [17,18]. While the reduction of the potential window for rechargeable MABs is desirable, the introduction of H 2 O 2 in these devices is accompanied with a selectivity challenge, considering that the redox chemistry of the twoelectron peroxide processes is thermodynamically unfavored compared to ORR and OER.…”

“…16 The main idea is that the redox processes involving hydrogen peroxide consist only of two proton-electron transfer steps, thus resulting in smaller overpotentials compared to the four-electron bifunctional oxygen electrocatalysis. 17,18 While the reduction of the potential window for rechargeable MABs is desirable, the introduction of H 2 O 2 in these devices is accompanied by a selectivity challenge, considering that the redox chemistry of the two-electron peroxide processes is thermodynamically unfavored compared to the ORR and OER. Two different situations are conceivable for the notion of rechargeable metal-hydrogen peroxide batteries:…”

Investigation of the Pt/Ti3C2Tx Nanocomposite Prepared by γ-Radiolysis: Uncovering the Strong Metal–Support Interaction (SMSI) toward Multifunctional Electrocatalysis

“…Despite the surge in global energy demand and the dwindling energy resources, mankind has still not progressed toward large-scale development of efficient energy-based technologies. There is a substantial desire for clean, sustainable, and renewable energy sources such as metal–air batteries, fuel cells, and water-splitting devices. , Despite the widespread attention of these electrochemical systems, there are, however, undeniable challenges that must be addressed, such as the sluggish kinetics of the oxygen reduction reaction (ORR), poisoning-related downfalls of the methanol oxidation reaction (MOR), the subdued performance of the oxygen evolution reaction (OER), and unstable performance in the hydrogen evolution reaction (HER). With this view, advancement is being made in the area of electrocatalysts to lower the overpotential and show desirable catalytic activity and durability.…”

Nano-interfacial interactions in 2-D Ni3S2–Ni3N nanosheets for the hydrogen evolution reaction in an alkaline medium

“…In this regard, electrocatalytic water splitting can be a potential technique, which can yield hydrogen using renewable energies. [3][4][5][6][7] The ideal HER catalysts are considered to be the platinumgroup (Pt and Ir)-metals and their composites. However, there is a dearth of availability of such metals making them highly expensive and thus limiting their widespread use.…”