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NTIS 바로가기Korean chemical engineering research = 화학공학, v.54 no.6, 2016년, pp.854 - 862
김인겸 (광운대학교 화학공학과) , 나인욱 (한국과학기술연구원) , 박세규 (광운대학교 화학공학과)
As the demand for a clean energy to replace fossil fuel being depleted increases, hydrogen energy is considered as a promising candidate for future energy source. Water electrolysis which produces hydrogen has high energy efficiency and stability but still has a large overpotential for oxygen evolut...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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우수한 수전해촉매의 특징은 무엇인가? | 여러 물질의 상대적 활성을 규명하기 위해 가로축은 개시전압(onset potential), 세로축은 10 mA cm-2 일 때의 전압값(vs RHE)으로 표기하였다. 일반적인 수전해촉매는 개시전압이 낮을수록, 동일전류일 때 전압이 클수록 우수한 촉매이므로, 위 그림에서는 왼쪽 및 아래쪽에 위치할수록 상대적으로 우수한 산소발생반응 활성을 보이는 촉매라고 할 수 있다. | |
수소를 생산하는 방법인 수전해 기술의 장단점은 무엇인가? | 최근 화석연료를 대체할 친환경 신재생에너지에 대한 요구가 증가하면서 수소에너지가 미래 대체에너지원으로서 주목받고 있다. 수소를 생산하는 방법 중 수전해 기술은 에너지효율과 안정성이 뛰어난 장점이 있지만, 산소발생반응시 발생하는 높은 과전압은 여전히 단점으로 지적되고 있다. 본 연구에서는 분무열분해 공정을 통하여 Co 전구체로부터 $Co_3O_4$를 제조하였다. | |
본 연구에서 Co3O4 합성에 사용한 분무열분해 공정의 장점은 무엇인가? | 하지만 이러한 방법들은 합성 이외에도 여러 후처리 과정이 필요하기 때문에 전체 제조시간이 오래 걸리며 불순물이 유입될 가능성이 높고, 입자의 형태, 크기를 조절하기가 쉽지않다. 위 방법들과 달리 분무열분해 공정은 일반적으로 금속염들을 증류수에 용해시켜 만든 분무용액이 운반기체를 통해 전기로 내부에서 건조, 열분해, 결정화 과정을 거쳐 분말 형태로 합성이 되기때문에 액상법과 기상법의 장점을 모두 가지고 있다. 이 방법은 연 속단일공정으로서 촉매의 대량생산이 가능하고 한 액적에서 하나의 입자를 형성하기 때문에 매우 균일한 상태로 합성이 가능하다. 또한, 분무용액에 유기물 같은 첨가물을 넣어줌으로써 입자의 형상을 쉽게 조절할 수 있는 장점이 있다[44-46]. |
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