Zheng Guangwei,Jiang Shukang,Zhang Fengqing,Yu Hongwen,Zhang Yanli L.
Choosing suitable photoanode materials is the most critical aspect for photoelectrochemical (PEC) water splitting. The low efficiency of PEC water splitting photoanodes restricts their widespread application for large-scale H 2 production. Herein, we prepared WO 3 photoanodes with controllable structures via hydrothermal-electrophoretic deposition and seed-mediated hydrothermal synthesis, achieving ex situ assembly and in situ growth on FTO glass substrates. Under simulated sunlight irradiation, the photoelectric current density of the WO 3 photoanode prepared by in situ hydrothermal synthesis exceeds 1.0 mA/cm² (at 1.23 V vs. RHE), significantly higher than that of the WO 3 photoanode prepared by ex situ assembly (which is less than 0.3 mA/cm² at 1.23 V vs. RHE). By contrast, the in situ preparation of the WO 3 photoanode using tungsten powder and H 2 O 2 as raw materials exhibits the enhanced photocurrent density of 1.27 mA/cm² at 1.23 V vs. RHE. The excellent PEC performance of the resulting sample could be attributed to the ordered charge transport channels from the two-dimensional (2D) nanoplates structure, the enhanced electron-hole pairs separation from the superior crystallinity of WO 3 and the strong binding between the WO 3 nanoplates and the FTO substrate. Additionally, the effect of calcination temperature on the PEC performance of the prepared WO 3 was further investigated. This work provides a way for the synthesis of environmentally friendly and cost-effective photoanodes for efficient photoelectrochemical water splitting.
Ke Xiao,Huiyu Liang,Siyuan Chen,Bo Yang,Junmin Zhang,Juying Li
The degradation of organic pollutants in saline wastewater has been a challenge for environmental remediation. In this study, a two-chamber cell was structured to simultaneously degrade organic contaminants (bisphenol A, BPA) from saline wastewater and produce hydrogen peroxide (H 2 O 2 ). In the anode chamber, a new solar-light-driven system was devised using chloride ions (Cl‾) as a medium and WO 3 photoanode as a radical initiator. Under solar light irradiation, photogenerated holes yielded at the WO 3 photoanode promoted the conversion of Cl‾ to reactive chlorine species, which could oxidize BPA more rapidly. The results indicated that the BPA removal can be significantly enhanced by increasing pH to 10.8 or increasing the Cl‾ concentration to 200 mM. At these conditions, 92% BPA was degraded into CO 2 and H 2 O in 120 min. In the cathode chamber, a new dopamine modified carbon felt (CF-DPA) cathode was employed to produce H 2 O 2 , obtaining a high concentration of 5.4 mM under optimum conditions. The electrochemical analyses for CF-DPA revealed that dopamine modification promoted electron transfer and enhanced the two-electron oxygen reduction to increase H 2 O 2 yields.
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