Dataset of "Photoelectrochemical generation of H2O2 using hematite (α-Fe2O3) and gas diffusion electrode (GDE)"

In contrast to the industrial-scale production of H2O2 the electrochemical or photoelectrochemical synthesis is environmentally friendly. In the present work, the photoelectrochemical generation of H2O2 was studied by combining the hematite (α-Fe2O3/FTO/glass) photoanode and gas diffusion electrode (GDE) modified by incorporation of tin (II) phthalocyanine (SnPc) in its hydrophilic layer. The experiments were carried out in a photoelectrochemical cell with two compartments separated by a proton exchange membrane under applied bias and AM1.5 irradiation (100 mW/cm2). The generated amount of H2O2 was determined by chemical analysis (visible light spectrophotometry) of the electrolyte. As a tool to determine the efficiency of such a process, the Faradaic efficiency (FE) was calculated. The best configuration used air as an inlet gas for GDE and phosphate buffer (pH 6.4) as an electrolyte in the cathodic compartment. The combination of hematite and GDE (with SnPc) was the most effective in H2O2 photoelectrochemical generation. The highest value of FE was 52.4 % for GDE (O2 reduction to H2O2) and 0.4 % for hematite photoanode (H2O oxidation to H2O2).与过氧化氢（H₂O₂）的工业化大规模生产相比，电化学或光电化学合成方式更具环境友好性。本研究通过将赤铁矿（α-Fe₂O₃/FTO/玻璃）光阳极与在亲水层中掺杂酞菁锡(II)（SnPc）改性的气体扩散电极（GDE）相结合，开展了过氧化氢光电化学生成的相关研究。实验在采用质子交换膜分隔的双舱室光电化学池中进行，实验过程中施加偏置电压并辅以AM1.5标准辐照（100 mW/cm²）。通过对电解液开展化学分析（可见光分光光度法），测定了生成的过氧化氢总量，并以法拉第效率（FE）作为该工艺效率的评价指标进行计算。最优实验配置为：气体扩散电极以空气作为进气气源，阴极舱室采用pH 6.4的磷酸盐缓冲液作为电解液。赤铁矿光阳极与掺杂酞菁锡(II)的气体扩散电极的组合在过氧化氢光电化学生成中表现出最佳催化效果，其中气体扩散电极（将氧气还原为过氧化氢）的最高法拉第效率可达52.4%，而赤铁矿光阳极（将水氧化为过氧化氢）的法拉第效率仅为0.4%。