In this study, we synthesize tungsten oxide thin films by electrodeposition and characterize their electrochromic properties. Depending on the deposition modes, compact and porous tungsten oxide films are fabricated on a transparent indium tin oxide (ITO) substrate. The morphology and crystal structure of the electrodeposited tungsten oxide thin films are investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). X-ray photoelectron spectroscopy is employed to verify the chemical composition and the oxidation state of the films. Compared to the compact tungsten oxides, the porous films show superior electrochemical activities with higher reversibility during electrochemical reactions. Furthermore, they exhibit very high color contrast (97.0%) and switching speed (3.1 and 3.2 s). The outstanding electrochromic performances of the porous tungsten oxide thin films are mainly attributed to the porous structure, which facilitates ion intercalation/deintercalation during electrochemical reactions.

Abstract
 1. 서 론
 2. 실험 방법
 3. 결과 및 고찰
 4. 결 론
 감사의 글
 References

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• 임재근(한국기술교육대학교 에너지신소재화학공학부) | Jae-Keun Lim
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• 이승현(한국기술교육대학교 에너지신소재화학공학부) | Seung-Hyun Lee
• 장세화(한국기술교육대학교 에너지신소재화학공학부) | Se-Hwa Jang
• 차경호(한국기술교육대학교 에너지신소재화학공학부) | Kyung-Ho Cha
• 나윤채(한국기술교육대학교 에너지신소재화학공학부) | Yoon-Chae Nah Corresponding Author
• 나윤채(한국기술교육대학교 에너지신소재화학공학부) | Yoon-Chae Nah Corresponding Author