Nano- and micro-structural control of WO3 photoelectrode films through aqueous synthesis of WO3･H2O and (NH4)0.33WO3 precursors

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抄録

Nano- and micro-structured tungsten trioxide (WO3) photoelectrode films were prepared through an aqueous solution route. WO3 precursor layers were deposited on glass substrates through heterogeneous nucleation from (NH4)10W12O41 aqueous solutions at 50–60 °C. The crystal phase of the precursors changed from WO3·H2O to (NH4)0.33WO3 with increasing (NH4)10W12O41 concentration (x), which involved a morphological change from micron-scale plates to nano-scale fine particles. The WO3·H2O and (NH4)0.33WO3 layers were thermally converted to the monoclinic WO3 phase. The fine-particle WO3 films obtained from (NH4)0.33WO3 layers showed a better photoanodic performance in the UV range below 350 nm, which was attributed to the larger surface area arising from the porous structure. On the other hand, platy-particle WO3 films were obtained from WO3·H2O layers, which exhibited strong light scattering in the visible range, and resulted in an enhanced photoanodic response at wavelengths above 375 nm.

This work was supported by KAKENHI, Grant-in-Aid for Scientific Research (C), Grant Number JP19K05660, the Kazuchika Okura Memorial Foundation (49th Research Grant), and the Kansai University Fund for Supporting Young Scholars, 2019. We thank Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.

収録刊行物

  • RSC Advances

    RSC Advances 10 (19), 11444-11449, 2020-03-20

    Royal Society of Chemistry

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