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Complete solar-driven dual-photoelectrode fuel cell for water purification and power generation in the presence of peroxymonosulfate
- Source :
- Journal of hazardous materials. 416
- Publication Year :
- 2020
-
Abstract
- This study reports the development of complete solar-driven dual-photoelectrode fuel cell (PFC) based on WO3 photoanode and Cu2O photocathode with peroxymonosulfate (PMS) serving as cathodic electron acceptor. As indicated by photoelectrochemical measurements, the PMS was able to improve thermodynamic properties of photocathode, achieving an increased open circuit potential from 0.42 V to 0.65 V vs standard hydrogen electrode (SHE). Under simulated sunlight irradiation (~100 mW cm−2), the maximum power density of 0.12 mW cm−2 could be obtained at current density of 0.34 mA cm−2, which was 8.57 times of that produced by PFC without PMS (0.014 mW cm−2). Correspondingly, adding PMS (1.0 mM) increased overall removal efficiency of 4-chlorophenol (4-CP) from 39.8% to 96.8%, accounting for the first-order kinetic constant (k=0.056 min−1) being 6.67 times of that in the absence of PMS (k=0.0084 min−1). Radical quenching and electron spin-resonance (ESR) results suggested the contribution of free radicals (•OH and SO4•-) and non-radical pathway associated with direct activation of PMS by Cu2O photocathode. Fourier transformed infrared (FTIR) analysis confirmed the strong non-radical interaction between Cu2O photocathode and PMS, resulting in 4-CP removal via activation of PMS by surface complex on Cu2O. The proof-in-concept complete solar-driven dual-photoelectrode fuel cell may offer an effective manner to realize water purification and power generation, making wastewater treatment more economical and more sustainable.
- Subjects :
- chemistry.chemical_classification
Quenching
021110 strategic, defence & security studies
Environmental Engineering
Materials science
Standard hydrogen electrode
Open-circuit voltage
Health, Toxicology and Mutagenesis
0211 other engineering and technologies
Portable water purification
02 engineering and technology
010501 environmental sciences
Electron acceptor
01 natural sciences
Pollution
Photocathode
Chemical engineering
chemistry
Environmental Chemistry
Fourier transform infrared spectroscopy
Waste Management and Disposal
Current density
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 18733336
- Volume :
- 416
- Database :
- OpenAIRE
- Journal :
- Journal of hazardous materials
- Accession number :
- edsair.doi.dedup.....6174b0f8ef52e39b33079cdf4c79a22b