Zhang Danfeng, An Changwei, Liu Dandan, Liu Tong, Wang Te, Wang Min
School of Biomedical & Chemical Engineering, Liaoning Institute of Science and Technology, Benxi 117004, China.
College of Chemistry, Liaoning University, Shenyang 110036, China.
Molecules. 2025 Apr 25;30(9):1908. doi: 10.3390/molecules30091908.
Developing high-efficiency photoelectrodes plays an important role in the photoelectrocatalytic generation of hydrogen peroxide (HO) in the photoelectrochemical (PEC) water splitting field. In this work, an innovative strategy was proposed, the synergistic photocatalytic production of HO using a bidirectional photoanode-photocathode coupling system under visible-light irradiation. FeO-Ti, as the photoanode, which was built by way of FeO loaded on Ti-mesh using the hydrothermal-calcination method, was investigated in terms of the suitability of its properties for PEC HO production after optimization of the bias voltage, the type of electrolyte solution, and the concentration of the electrolyte. Afterwards, a H-type double-electrode coupling system with an FeO-Ti photoanode and a WO@CoSnO photocathode was established for the bidirectional synergistic production of HO under visible-light irradiation. The yield of HO reached 919.56 μmol·L·h in 2 h over -0.7 V with 1 mol·L of KHCO as the anolyte and 0.1 mol·L NaSO as the catholyte (pH = 3). It was inferred that HO production on the WO@CoSnO photocathode was in line with the 2e oxygen reduction reaction (ORR) principle, and on the FeO-Ti photoanode was in line with the 2e water oxidation reaction (WOR) rule, or it was indirectly promoted by the electrolyte solution KHCO. This work provides an innovative idea and a reference for anode-cathode double coupling systems for the bidirectional production of HO.
开发高效光电极在光电化学（PEC）水分解领域中光催化产过氧化氢（HO）方面起着重要作用。在这项工作中，提出了一种创新策略，即在可见光照射下使用双向光阳极 - 光阴极耦合系统协同光催化生产HO。通过水热煅烧法将FeO负载在钛网上构建的FeO-Ti作为光阳极，在优化偏压、电解液类型和电解液浓度后，研究了其性能对PEC产HO的适用性。之后，建立了一种具有FeO-Ti光阳极和WO@CoSnO光阴极的H型双电极耦合系统，用于在可见光照射下双向协同生产HO。以1 mol·L的KHCO作为阳极电解液，0.1 mol·L的NaSO作为阴极电解液（pH = 3），在-0.7 V下2小时内HO的产量达到919.56 μmol·L·h。据推断，在WO@CoSnO光阴极上产HO符合2e氧还原反应（ORR）原理，在FeO-Ti光阳极上符合2e水氧化反应（WOR）规则，或者是由电解液KHCO间接促进的。这项工作为HO双向生产的阳极 - 阴极双耦合系统提供了创新思路和参考。
