Recent Progress of Electrochemical Production of Hydrogen Peroxide by Two‐Electron Oxygen Reduction Reaction

Advanced Science, Год журнала: 2021, Номер 8(15)

Опубликована: Май 27, 2021

Shifting electrochemical oxygen reduction reaction (ORR) via two-electron pathway becomes increasingly crucial as an alternative/green method for hydrogen peroxide (H2 O2 ) generation. Here, the development of 2e- ORR catalysts in recent years is reviewed, aspects mechanism exploration, types high-performance catalysts, factors to influence catalytic performance, and potential applications ORR. Based on previous theoretical experimental studies, underlying firstly unveiled, aspect pathway, thermodynamic free energy diagram, limiting potential, volcano plots. Then, various efficient producing H2 are summarized. Additionally, active sites catalysts' such electronic structure, carbon defect, functional groups (O, N, B, S, F etc.), synergistic effect, others (pH, pore steric hindrance etc.) discussed. The electrogeneration also has wastewater treatment, disinfection, organics degradation, storage. Finally, future directions prospects electrochemically examined. These insights may help develop highly active/selective shape application this method.

Язык: Английский

---

Designing CO₂ reduction electrode materials by morphology and interface engineering

Energy & Environmental Science, Год журнала: 2020, Номер 13(8), С. 2275 - 2309

Опубликована: Янв. 1, 2020

This review discusses how morphology and interface engineering promote electrocatalytic CO₂ reduction, providing general design principles to fabricate advanced electrode catalysts.

Язык: Английский

---

Chloride-mediated selective electrosynthesis of ethylene and propylene oxides at high current density

Science, Год журнала: 2020, Номер 368(6496), С. 1228 - 1233

Опубликована: Июнь 11, 2020

Charging into epoxides Ethylene oxide is a strained, reactive molecule produced on vast scale as plastics precursor. The current method of synthesis involves the direct reaction ethylene and oxygen at high temperature, but original protocol relied reduction chlorine to produce chlorohydrin intermediate. Leow et al. report room temperature that returns route uses electrochemistry generate it catalytically from chloride (see Perspective by Barton). This efficient process water in place can be integrated with electrochemical generation carbon dioxide. Propylene using same method. Science , this issue p. 1228 ; see also 1181

Язык: Английский

---

Promoting H2O2 production via 2-electron oxygen reduction by coordinating partially oxidized Pd with defect carbon

Nature Communications, Год журнала: 2020, Номер 11(1)

Опубликована: Май 1, 2020

Abstract Electrochemical synthesis of H 2 O through a selective two-electron (2e − ) oxygen reduction reaction (ORR) is an attractive alternative to the industrial anthraquinone oxidation method, as it allows decentralized production. Herein, we report that synergistic interaction between partially oxidized palladium (Pd δ+ and oxygen-functionalized carbon can promote 2e ORR in acidic electrolytes. An electrocatalyst synthesized by solution deposition amorphous Pd clusters 3 4 onto mildly nanotubes -OCNT) shows nearly 100% selectivity toward positive shift onset potential ~320 mV compared with OCNT substrate. A high mass activity (1.946 mg −1 at 0.45 V) -OCNT achieved. Extended X-ray absorption fine structure characterization density functional theory calculations suggest nearby oxygen-containing groups key for ORR.

Язык: Английский

---

Mechanistic analysis of multiple processes controlling solar-driven H2O2 synthesis using engineered polymeric carbon nitride

Nature Communications, Год журнала: 2021, Номер 12(1)

Опубликована: Июнь 17, 2021

Abstract Solar-driven hydrogen peroxide (H 2 O ) production presents unique merits of sustainability and environmental friendliness. Herein, efficient solar-driven H through dioxygen reduction is achieved by employing polymeric carbon nitride framework with sodium cyanaminate moiety, affording a rate 18.7 μmol h −1 mg an apparent quantum yield 27.6% at 380 nm. The overall photocatalytic transformation process systematically analyzed, some previously unknown structural features interactions are substantiated via experimental theoretical methods. cyanamino group pyridinic nitrogen-coordinated soidum in the promote photon absorption, alter energy landscape improve charge separation efficiency, enhance surface adsorption dioxygen, create selective 2e − oxygen reaction surface-active sites. Particularly, electronic coupling interaction between surface, which boosts population prolongs lifetime active shallow-trapped electrons, experimentally substantiated.

Язык: Английский

---