Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Photoelectrochemical performance of anodized nanoporous iron oxide based on annealing conditions

양극산화로 제조된 다공성 나노구조 철 산화막의 열처리 조건에 따른 광전기화학적 성질

  • Dongheon Jeong (Department of Chemistry and Chemical Engineering, Inha University) ;
  • JeongEun Yoo (Department of Chemistry and Chemical Engineering, Inha University) ;
  • Kiyoung Lee (Department of Chemistry and Chemical Engineering, Inha University)
  • 정동헌 (인하대학교 화학.화학공학융합학과) ;
  • 유정은 (인하대학교 화학.화학공학융합학과) ;
  • 이기영 (인하대학교 화학.화학공학융합학과)
  • Received : 2023.07.21
  • Accepted : 2023.08.11
  • Published : 2023.08.31
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Abstract

Photoelectrochemical (PEC) water splitting is one of the promising methods for hydrogen production by solar energy. Iron oxide has been effectively investigated as a photoelectrode material for PEC water splitting due to its intrinsic property such as short minority carrier diffusion length. However, iron oxide has a low PEC efficiency owing to a high recombination rate between photoexcited electrons and holes. In this study, we synthesized nanoporous structured iron oxide by anodization to overcome the drawbacks and to increase surface area. The anodized iron oxide was annealed in Ar atmosphere with different purging times. In conclusion, the highest current density of 0.032 mA/cm2 at 1.23 V vs. RHE was obtained with 60 s of pursing for iron oxide(Fe-60), which was 3 times higher in photocurrent density compared to iron oxide annealed with 600 s of pursing(Fe-600). The resistances and donor densities were also evaluated for all the anodized iron oxide by electrochemical impedance spectra and Mott-Schottky plot analysis.

Keywords

Acknowledgement

본 연구는 2021년도 산업통상자원부의 재원으로 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구과제입니다. (No. 2021202080023C)

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