| 학회 |
한국재료학회 |
| 학술대회 |
2020년 가을 (11/18 ~ 11/20, 휘닉스 제주 섭지코지) |
| 권호 |
26권 1호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Fluorine-surface-modified tin-doped hematite nanorod array photoelectrodes with enhanced water oxidation activity |
| 초록 |
Severe charge recombination and the sluggish water oxidation kinetics significantly limit the practical application of hematite in photoelectrochemical (PEC) water-splitting devices. In this study, fluorine-surface-modified tin-doped hematite (F/Sn:Fe2O3) photoelectrodes have been fabricated by a hydrothermal method incorporated impregnation annealing process . The grown FeOOH nanorods coated with NH4F solution were annealed first at 550 °C in vacuum to modify hematite surface and then at 750 °C in argon to promote the diffusion of tin atoms from the fluorine-doped tin oxide (FTO) glass substrate to the hematite structure. The synergistic effect of F-modification and Sn-doping on Fe2O3 electrode considerably enhanced its PEC water oxidation performance, resulting in the highest photocurrent density of 3.64 mA cm–2 at 1.23 V vs. reversible hydrogen electrode (RHE) under AM 1.5 G illumination. Both effects increased the carrier concentration in the photoelectrode, which improved its transport efficiency. Moreover, the surface-localized F species promoted the oxidation evolution reaction (OER) process on the electrode surface and improved the charge separation at the electrode/electrolyte interface by increasing its holes supply rate under the increased electric field. This work may open a new avenue for fabricating novel photoelectrodes with high PEC water splitting efficiency. |
| 저자 |
Nguyen Duc Quang, Sutripto Majumder, Chunjoong Kim, Dojin Kim
|
| 소속 |
Chungnam National Univ. |
| 키워드 |
F-surface-modification; Sn-doping; Fe<SUB>2</SUB>O<SUB>3</SUB> nanorods; photoelectrochemical; water splitting |
| E-Mail |
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