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Cobalt-Phosphate-Assisted Photoelectrochemical Water Oxidation by Arrays of Molybdenum-Doped Zinc Oxide Nanorods

Authors

  • Dr. Yan-Gu Lin,

    Corresponding author
    1. National Synchrotron Radiation Research Center, Hsinchu 30076 (Taiwan)
    • Yan-Gu Lin, National Synchrotron Radiation Research Center, Hsinchu 30076 (Taiwan)

      Li-Chyong Chen, Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617 (Taiwan)

      Kuei-Hsien Chen, Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617 (Taiwan)

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  • Prof. Yu-Kuei Hsu,

    1. Department of Opto-Electronic Engineering, National Dong Hwa University, Hualien 97401 (Taiwan)
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  • Ying-Chu Chen,

    1. Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617 (Taiwan)
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  • Bing-Wei Lee,

    1. Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 202 (Taiwan)
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  • Prof. Jih-Shang Hwang,

    1. Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 202 (Taiwan)
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  • Dr. Li-Chyong Chen,

    Corresponding author
    1. Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617 (Taiwan)
    • Yan-Gu Lin, National Synchrotron Radiation Research Center, Hsinchu 30076 (Taiwan)

      Li-Chyong Chen, Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617 (Taiwan)

      Kuei-Hsien Chen, Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617 (Taiwan)

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  • Dr. Kuei-Hsien Chen

    Corresponding author
    1. Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617 (Taiwan)
    2. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617 (Taiwan)
    • Yan-Gu Lin, National Synchrotron Radiation Research Center, Hsinchu 30076 (Taiwan)

      Li-Chyong Chen, Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617 (Taiwan)

      Kuei-Hsien Chen, Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617 (Taiwan)

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Abstract

We report the first demonstration of cobalt phosphate (Co-Pi)-assisted molybdenum-doped zinc oxide nanorods (Zn1−xMoxO NRs) as visible-light-sensitive photofunctional electrodes to fundamentally improve the performance of ZnO NRs for photoelectrochemical (PEC) water splitting. A maximum photoconversion efficiency as high as 1.05 % was achieved, at a photocurrent density of 1.4 mA cm−2. More importantly, in addition to achieve the maximum incident photon to current conversion efficiency (IPCE) value of 86 %, it could be noted that the IPCE of Zn1−xMoxO photoanodes under monochromatic illumination (450 nm) is up to 12 %. Our PEC performances are comparable to those of many oxide-based photoanodes in recent reports. The improvement in photoactivity of PEC water splitting may be attributed to the enhanced visible-light absorption, increased charge-carrier densities, and improved interfacial charge-transfer kinetics due to the combined effect of molybdenum incorporation and Co-Pi modification, contributing to photocatalysis. The new design of constructing highly photoactive Co-Pi-assisted Zn1−xMoxO photoanodes enriches knowledge on doping and advances the development of high-efficiency photoelectrodes in the solar-hydrogen field.

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