研究目的
To enhance the efficiency of BiVO4 photoanodes for solar-driven water splitting by constructing a Co(OH)2/BiVO4 heterojunction photoanode and assembling it in tandem with a carbon-based perovskite solar cell (PSC) to achieve a high solar-to-hydrogen (STH) conversion efficiency.
研究成果
The Co(OH)2/BiVO4 heterojunction photoanode significantly enhances the PEC performance for water splitting, achieving a high STH efficiency of 4.6% when assembled in tandem with a carbon-based PSC. This demonstrates the potential of using modified BiVO4 photoanodes in efficient and stable solar water splitting devices.
研究不足
The study does not extensively explore the long-term stability of the Co(OH)2/BiVO4 photoanode under continuous operation or the scalability of the fabrication process for industrial applications.
1：Experimental Design and Method Selection:
The study employed a simple solution impregnation method to load Co(OH)2 onto BiVO4 to fabricate a heterojunction photoanode. The performance of the photoanode was evaluated through photoelectrochemical (PEC) measurements.
2：Sample Selection and Data Sources:
BiVO4 photoanodes were prepared via electrodeposition and annealing processes. Co(OH)2 was loaded onto BiVO4 by immersing the photoanode in cobalt(II) chloride solutions.
3：List of Experimental Equipment and Materials:
Equipment included a potentiostat for electrodeposition, a furnace for annealing, and a spectrophotometer for UV-vis measurements. Materials included Bi(NO3)2·5H2O, KI, vanadium(III) acetylacetonate, and cobalt(II) chloride.
4：Experimental Procedures and Operational Workflow:
The BiVO4 photoanode was fabricated by electrodepositing BiOI on FTO, converting it to BiVO4 via annealing, and then modifying it with Co(OH)2. The PEC performance was measured under simulated sunlight.
5：The PEC performance was measured under simulated sunlight.
Data Analysis Methods:
5. Data Analysis Methods: The photocurrent density, applied bias photon-to-current efficiency (ABPE), and incident photon-to-current efficiency (IPCE) were analyzed to evaluate the photoanode performance.
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