研究目的
To demonstrate H2 production by photoactive α-FeOOH by GC-MS using isotope labeled methanol and to explore the conditions for activation of α-FeOOH for H2 production.
研究成果
The study demonstrated H2 production by photoactive α-FeOOH, with the synthesized α-FeOOH showing 25 times higher activity than TiO2. The conditions for H2 production were low pH, an electron donor, consuming oxygen, and irradiation stronger than the band gap. The mechanism involves photoreduction of α-FeOOH and electron storage, leading to H2 production.
研究不足
The details of why O2 consumption is an important factor for H2 production remain unclear. The study also notes that the reaction requires UV irradiation stronger than the band gap of α-FeOOH (2.2 eV), limiting its application under visible light.
1：Experimental Design and Method Selection:
The study involved the use of α-FeOOH as a photocatalyst for H2 production under Hg-Xe irradiation. The conditions for activation included low pH, an electron donor, and oxygen consumption.
2：Sample Selection and Data Sources:
Commercially available α-FeOOH and synthesized α-FeOOH by coprecipitation method were used. The H2 production was confirmed by GC-MS using isotope-labeled water (D2O) and deuterated methanol.
3：List of Experimental Equipment and Materials:
Hg-Xe lamp for irradiation, GC-MS for analysis, and various electron donors including methanol, ethanol, propanol, oxalic acid, and Fe2+.
4：2+.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The photocatalytic activity was evaluated by measuring the amount of H2 gas evolved and O2 gas consumed under irradiation. The durability of α-FeOOH was tested over 400 h.
5：Data Analysis Methods:
The relation between H2 production and O2 consumption was analyzed, and the mechanism was proposed based on XPS and electrochemical analysis.
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