光电阴极
氧化还原
多硫化物
化学
电化学
发电
激进的
电子
电
材料科学
电极
光化学
化学工程
电解质
物理
功率(物理)
无机化学
物理化学
热力学
有机化学
量子力学
工程类
作者
Tao Luo,Jing Bai,Jinhua Li,Qingyi Zeng,Youzhi Ji,Li Qiao,Xiaoyan Li,Jing Bai
标识
DOI:10.1021/acs.est.7b03116
摘要
A novel, facile self-driven photoelectrocatalytic (PEC) system was established for highly selective and efficient recovery of H2S and simultaneous electricity production. The key ideas were the self-bias function between a WO3 photoanode and a Si/PVC photocathode due to their mismatched Fermi levels and the special cyclic redox reaction mechanism of I–/I3–. Under solar light, the system facilitated the separation of holes in the photoanode and electrons in the photocathode, which then generated electricity. Cyclic redox reactions were produced in the photoanode region as follows: I– was transformed into I3– by photoholes or hydroxyl radicals, H2S was oxidized to S by I3–, and I3– was then reduced to I–. Meanwhile, H+ was efficiently converted to H2 in the photocathode region. In the system, H2S was uniquely oxidized to sulfur but not to polysulfide (Sxn-) because of the mild oxidation capacity of I3–. High recovery rates for S and H2 were obtained up to ∼1.04 mg h–1 cm–1 and ∼0.75 mL h–1 cm–1, respectively, suggesting that H2S was completely converted into H2 and S. In addition, the output power density of the system reached ∼0.11 mW cm–2. The proposed PEC-H2S system provides a self-sustaining, energy-saving method for simultaneous H2S treatment and energy recovery.
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