期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 238, 期 -, 页码 309-317出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.07.005
关键词
Wastewater treatment; Electricity; Hydrogen; WO3/BiVO(4)photoanode; Sunlight
资金
- National Key Research and Development Plan [2016YFA0203200]
- National Natural Science Foundation of China [51538013]
- Natural Science Foundation of Guangdong Province [2018A030313367, 2018A030313487]
- Science Starting Foundation of Guangzhou University [69-18ZX10298, 27000503151, 2700050302]
A novel self-sustaining monolithic photoelectrocatalytic/photovoltaic (SMPP) system is constructed with a FTO-glass-based WO3/BiVO4 photoanode, which was prepared by coating BiVO(4)on WO3 nanoplate array using simple wet chemical methods, a rear Si photovoltaic cell (PVC) and a counter Pt-black/Pt cathode. The optimum SMPP system shows an efficient and stable degradation of tetracycline hydrochloride with a rate constant 0.75 h(-1) and yields an open circuit voltage 1.35 V, a short circuit current 2900 mu A cm(-2), a power density 1112 mu W cm(-2), which is nearly 14 times that of theultimate conventional photocatalytic fuel cell to date, and a hydrogen generation rate 52.6 mu mol h(-1) cm(-2). This outstanding performance should be due to the efficient electron/hole separation and light exploitation, because, under stimulated sunlight illumination, the front WO3/BiVO4 photoanode absorbs short-wavelength photons and generates electron/hole pairs, in which the photogenerated holes can oxidize organics, while the rear Si PVC captures the transmitting longer-wavelength photons to generate photovoltage that drives photogenerated electrons to the cathode for reducing H+ to H-2 and generating electricity in the external-circuit. The results also demonstrate that various refractory organics can be efficiently decomposed along with the production of electricity and hydrogen by the SMPP system. This work provides a more efficient way to dispose organics and simultaneously produce clean energy than conventional technologies and serves well as a promising technology for wastewater recycling.
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