A TiO2-nanotube-array-based photocatalytic fuel cell using refractory organic compounds as substrates for electricity generation.

School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai, 200240, People's Republic of China.
Chemical Communications (Impact Factor: 6.38). 08/2011; 47(37):10314-6. DOI: 10.1039/c1cc13388h
Source: PubMed

ABSTRACT A TiO(2)-nanotube-array-based photocatalytic fuel cell system was established for generation of electricity from various refractory organic compounds and simultaneous wastewater treatment. The present system can respond to visible light and produce obviously enhanced cell performance when a narrow band-gap semiconductor (i.e. Cu(2)O and CdS) was combined with TiO(2) nanotubes.

  • [Show abstract] [Hide abstract]
    ABSTRACT: In this work, an optofluidics based micro-photocatalytic fuel cell with a membrane-free and air-breathing mode was proposed to greatly enhance the cell performance. The incorporation of the optofluidic technology into a photocatalytic fuel cell not only enlarges the specific illumination and reaction area but also enhances the photon and mass transfer, which eventually boosts the photocatalytic reaction rate. Our results show that this new photocatalytic fuel cell yields a much higher performance in converting organics into electricity. A maximum power density of 0.58 mW cm(-2) was achieved. The degradation performance of this new optofluidic micro-photocatalytic fuel cell was also evaluated and the maximum degradation efficiency reached 83.9%. In short, the optofluidic micro-photocatalytic fuel cell developed in this work shows promising potential for simultaneously degrading organic pollutants and generating electricity.
    Lab on a Chip 07/2014; · 5.75 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: To use visible light more effectively in photocatalytic reactions, well-defined Pt-modified hollow TiO2 (HPT) spheres were prepared through a hydrothermal-synthesis process using carbon spheres as templates, followed by calcinations and photochemical reduction. The photocatalysts were characterized by a number of techniques, including X-ray diffraction, transmission electron microscopy, UV–vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy and photoluminescence measurements. The photocatalytic activity of the fabricated HPT photocatalyst for the degradation of methylene blue under visible-light irradiation was determined. The HPT photocatalyst with a Pt/TiO2 mass ratio of 0.75% exhibits the optimal photocatalytic ability at a catalyst amount of 2 g L−1. The pseudo-first-order rate constant kapp for 0.75% HPT is five times that for solid TiO2 nanoparticles (P25) and three times that for hollow TiO2. Hydroxyl and superoxide radical signals were detected by means of electron paramagnetic resonance spectroscopy; these radicals are most probably responsible for the effectiveness of the HPT photocatalyst.
    Chemical Engineering Journal 05/2013; 223:592–603. · 4.06 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The photoelectrochemical cell (PEC) is a promising tool for the degradation of organic pollutants and simultaneous electricity recovery, however, current cathode catalysts suffer from high costs and short service lives. Herein, we present a novel biocathode coupled PEC (Bio-PEC) integrating the advantages of photocatalytic anode and biocathode. Electrochemical anodized TiO2 nanotube arrays fabricated on Ti substrate were used as Bio-PEC anodes. Field-emission scanning electron microscope (FE-SEM) images revealed that the well-aligned TiO2 nanotubes had inner diameters of 60-100 nm and wall-thickness of about 5 nm. Linear sweep voltammetry (LSV) presented the pronounced photocurrent output (325 μA/cm2) under xenon illumination compared with that in dark condition. Comparing studies were carried out between the Bio-PEC and PECs with Pt/C cathodes. The results showed that the performance of Pt/C cathodes was closely related with the structure and Pt/C loading amounts of cathodes, while the Bio-PEC achieved similar methyl orange (MO) decoloration rate (0.0120 min-1) and maximum power density (211.32 mW/m2) to the brush cathode PEC with 50 mg Pt/C loading (Brush-PEC (50 mg)). The fill factors of Bio-PEC and Brush-PEC (50 mg) were 39.87% and 43.06%, respectively. The charge transfer resistance of biocathode was 13.10 Ω, larger than the brush cathode with 50 mg Pt/C (10.68 Ω) but smaller than the brush cathode with 35 mg Pt/C (18.35 Ω), indicating the comparable catalytic activity with Pt/C catalyst. The biocathode was more dependent on the nutrient diffusion, such as nitrogen and inorganic carbon, thus resulted in relatively higher diffusion resistance comparing with the brush cathode with 50 mg Pt/C loading that yielded similar MO removal and power output. Considering the performance and cost of PEC system, the biocathode was a promising alternative for Pt/C catalyst.
    Environmental science & technology. 05/2014;


Available from
May 22, 2014