Hydrogen peroxide generation from O2 electroreduction for environmental remediation: A state-of-the-art review

Abstract

The electrochemical production of hydrogen peroxide (H 2 O 2 ) by 2-electron oxygen reduction reaction (ORR) is an attractive alternative to the present complex anthraquinone process. The objective of this paper is to provide a state-of-the-arts review of the most important aspects of this process. First, recent advances in H 2 O 2 production are reviewed and the advantages of H 2 O 2 electrogeneration via 2-electron ORR are highlighted. Second, the selectivity of the ORR pathway towards H 2 O 2 formation as well as the development process of H 2 O 2 production are presented. The cathode characteristics are the decisive factors of H 2 O 2 production. Thus the focus is shifted to the introduction of commonly used carbon cathodes and their modification methods, including the introduction of other active carbon materials, hetero-atoms doping (i.e., O, N, F, B, and P) and decoration with metal oxides. Cathode stability is evaluated due to its significance for long-term application. Effects of various operational parameters, such as electrode potential/current density, supporting electrolyte, electrolyte pH, temperature, dissolved oxygen, and current mode on H 2 O 2 production are then discussed. Additionally, the environmental application of electrogenerated H 2 O 2 on aqueous and gaseous contaminants removal, including dyes, pesticides, herbicides, phenolic compounds, drugs, VOCs, SO 2 , NO, and Hg 0 , are described. Finally, a brief conclusion about the recent progress achieved in H 2 O 2 electrogeneration via 2-electron ORR and an outlook on future research challenges are proposed.

Janus electrocatalytic flow-through membrane enables highly selective singlet oxygen production

“…Hydrogen peroxide (H 2 O 2 ) was generated at the vicinity of the Pd-CM surface (Fig. 2d), which we attribute to the two-electron cathodic reduction of O 2 50,54 . H 2 O 2 tended to accumulate above the Pd-CM surface, as evidenced by the higher H 2 O 2 concentration in Region B (Fig.…”

Highly efficient electrosynthesis of hydrogen peroxide on a superhydrophobic three-phase interface by natural air diffusion

“…It is noteworthy that the energy consumption was 118.0 kWh kg −1 excluding the energy consumption of aeration. It has been well known that a higher O 2 supply promotes the production of H 2 O 2 24 , but the oxygen utilization efficiency (OUE) of GDEs is extremely low (usually <1%) 25,26 . Yu et al proposed an improved GDE to synthesize H 2 O 2 , which increased the OUE to 8.84%, and the yield of H 2 O 2 reached 11.16 mg h −1 cm −2 at the current density of 35.7 mA cm −2 .…”

A New Redox Mediator (Cupric‐Neocuproine Complex)‐ Modified Pencil Graphite Electrode for the Electrocatalytic Oxidation of H2O2: A Flow Injection Amperometric Sensor

“…A large number of studies have been reported on the determination of H 2 O 2 , because H 2 O 2 has a great importance in various areas such as pharmaceutical, textile and food manufacturing industries, medical diagnosis, water treatment etc. [16] In addition, H 2 O 2 has been widely used for the indirect determination of many compounds such as bio-sensing of glucose based on oxidase enzyme, [17] peroxide-based explosives, [18] etc. In this direction, many researchers have made a great effort to develop more sensitive, selective, stable, simple, rapid, precise and cost-effective methods in the determination of H 2 O 2 .…”

“…A large number of studies have been reported on the determination of H 2 O 2 , because H 2 O 2 has a great importance in various areas such as pharmaceutical, textile and food manufacturing industries, medical diagnosis, water treatment etc . In addition, H 2 O 2 has been widely used for the indirect determination of many compounds such as bio‐sensing of glucose based on oxidase enzyme, peroxide‐based explosives, etc.…”