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Microwave-assisted metal-ion attachment for ex-situ zirconium doping into hematite for enhanced photoelectrochemical water splitting

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Listed:
  • Dhandole, Love Kumar
  • Anushkkaran, Periyasamy
  • Hwang, Jun Beom
  • Chae, Weon-Sik
  • Kumar, Manish
  • Lee, Hyun-Hwi
  • Choi, Sun Hee
  • Jang, Jum Suk
  • Lee, Jae Sung

Abstract

Ex-situ doping into hematite films is carried out via a short-duration (∼60 s) microwave-assisted metal-ions attachment (MWMA) of tetravalent Zr4+ ion on the surface of FeOOH/FTO, followed by high temperature annealing (HTA) to fabricate Zr4+:Fe2O3/FTO photoanode for photoelectrochemical (PEC) water splitting. Compared to a simple dipping attachment without microwave irradiation, this MWMA allows a much larger amount of attached Zr4+-ions on the FeOOH precursor, leading to a properly doped photoanode of much higher PEC activity. The primary effect of Zr4+ doping is to improve the charge transport characteristics in the bulk of hematite. In addition, it also boosts charge injection efficiency at the semiconductor and electrolyte interface by forming an inadvertent passivation layer and promoting hole transfer via surface states. As a result, the Zr4+:Fe2O3/FTO photoanode shows a higher photocurrent density of 1.54 mA cm−2 at 1.23 VRHE under 1 Sun irradiation relative to undoped Fe2O3/FTO (1.02 mA cm−2) or Zr4+:Fe2O3/FTO (1.19 mA cm−2) prepared without MWMA.

Suggested Citation

  • Dhandole, Love Kumar & Anushkkaran, Periyasamy & Hwang, Jun Beom & Chae, Weon-Sik & Kumar, Manish & Lee, Hyun-Hwi & Choi, Sun Hee & Jang, Jum Suk & Lee, Jae Sung, 2022. "Microwave-assisted metal-ion attachment for ex-situ zirconium doping into hematite for enhanced photoelectrochemical water splitting," Renewable Energy, Elsevier, vol. 189(C), pages 694-703.
    • Handle: RePEc:eee:renene:v:189:y:2022:i:c:p:694-703
    DOI: 10.1016/j.renene.2022.03.025
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    1. Ji-Wook Jang & Chun Du & Yifan Ye & Yongjing Lin & Xiahui Yao & James Thorne & Erik Liu & Gregory McMahon & Junfa Zhu & Ali Javey & Jinghua Guo & Dunwei Wang, 2015. "Enabling unassisted solar water splitting by iron oxide and silicon," Nature Communications, Nature, vol. 6(1), pages 1-5, November.
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    3. Hemin Zhang & Dongfeng Li & Woo Jin Byun & Xiuli Wang & Tae Joo Shin & Hu Young Jeong & Hongxian Han & Can Li & Jae Sung Lee, 2020. "Gradient tantalum-doped hematite homojunction photoanode improves both photocurrents and turn-on voltage for solar water splitting," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
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