H₂O₂ production on a carbon cathode loaded with a nickel carbonate catalyst and on an oxide photoanode without an external bias

Abstract

Efficient H2O2 production both on a nickel carbonate cathode and a photoanode using only H2O, O2, and solar light, was achieved without using an external bias or a membrane.

Alternatives to Water Photooxidation for Photoelectrochemical Solar Energy Conversion and Green H2 Production

“…However, when replacing HER with oxygen reduction reaction (ORR) (Equation ( 7)), a full-cell can be operated in the single-compartment cell without the membrane. To date, there are numerous studies based on this concept to construct a solar-driven H 2 O 2 production in both electrodes without applied bias [128] (Figure 5c) or light-driven fuel cell to store H 2 O 2 as chemical energy and produce electricity. [121,131] Nevertheless, since the critical point of this concept is ORR, which is the main reaction of cathode in the presence of O 2 gas, can be competitive with HER, it results in the limited efficiency of H 2 generation.…”

“…The simple and convenient measurements are standard strips and titration using iodine, potassium permanganate or Fe 2+ , where a highresolution camera or color discrimination can be equipped to enhance the accuracy of the method. [121][122][123][124][125]128,129] The other analytical method is high-performance liquid chromatographer (HPLC), which is considered to be highly precise and efficient, yet having higher operation cost, to online tracking throughout the process. [132][133][134]…”