전기변색기술은 전기화학적 반응으로 물질의 색을 바꾸는 기술이다. 이 반응에는 전자의 이동이 개입되며 전자의 이동에 따른 화학반응은 일반적인 화학반응과 차이를 나타낸다. 산화와 환원이라는 화학반응은 닫힌 회로 내에서 일어나며 오직 계면에서의 전위에 의존하게 된다. 이러한 전기변색기술을 응용한 분야는 자동차용 전기변색 거울, 스마트 윈도우와 같이 상용화에 성공한 분야도 있으며, 앞으로는 투명 디스플레이, 반사형 디스플레이 및 전가자격표시장치 등에 활용이 가능하다. 전기변색기술이 견인하는 세계시장규모는 에너지 절약 및 안전성에 대한 시대적인 요청으로 연평균 성장률 약 21%로 확대되어 2018년에는 약 50억달러의 규모로 성장할 수 있을 것으로 예측된다.
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