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Combined nanostructured Bi 2 S 3 /TNA photoanode and Pt/SiPVC photocathode for efficient self-biasing photoelectrochemical hydrogen and electricity generation

Nano Energy, ISSN: 2211-2855, Vol: 9, Page: 152-160
2014
  • 62
    Citations
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  • 33
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    62
    • Citation Indexes
      62
  • Captures
    33

Article Description

A good visible light responsive nanostructured Bi 2 S 3 /TiO 2 nanotube array (TNA) photoanode has been prepared for efficient self-biasing photoelectrochemical (PEC) hydrogen and electricity generation by combining with a Pt/SiPVC photocathode based on the mismatching Fermi levels between photoelectrodes. Under visible-light irradiation, the potential of Bi 2 S 3 /TNA photoanode is more negative than that of Pt/SiPVC photocathode, leading to a self-bias (open-circuit voltage V oc =0.766 V) which can facilitate photogenerated electrons in Bi 2 S 3 /TNA to recombine with photogenerated holes in Pt/SiPVC via external circuit. Intensity modulated photocurrent spectroscopy (IMPS) measurements showed that the transit time ( τ d ) was 8.54 ms for photogenerated electrons in Bi 2 S 3 /TNA photoanode and 6.42 ms for photogenerated holes in Pt/SiPVC photocathode, both of which were less than that of traditional PEC cells made up of Bi 2 S 3 /TNA photoanode and Pt counter-electrode (Bi 2 S 3 /TNA–Pt, 22.27 ms) or Pt/SiPVC photocathode and Pt counter-electrode (Pt–Pt/SiPVC, 15.85 ms). This demonstrates an efficient charge transport and low electron–hole recombination rate in the self-biasing PEC cell. In this system, short-circuit current, fill factor, and photoelectric conversion efficiency was 1.55 mA cm −2, 0.602, and 0.718%, respectively. A H 2 evolution rate of ~45.5 µmol cm −2 h −1, which was 141 times larger than Bi 2 S 3 /TNA–Pt and 1.8 times larger than Pt–Pt/SiPVC, was also achieved.

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