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분무열분해로 합성한 수전해용 Co<sub>3</sub>O<sub>4</sub>의 입자형태에 따른 산소발생 활성에 관한 연구
김인겸 ( Ingyeom Kim ),나인욱 ( In Wook Nah ),박세규 ( Sehkyu Park ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.6
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 evolution reaction (OER). In this study, Co<sub>3</sub>O<sub>4</sub> cat-alysts with different morphology were prepared by spray pyrolysis from solutions which contain Co precursor and var-ious organic additives (urea, sucrose, and citric acid), followed by post heat treatment. For the catalysts synthesized, X-ray diffraction (XRD) measurements were performed to identify their crystal structure. Morphology and surface shape of the catalysts were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Sur-face area and pore volume were examined by nitrogen adsortpion & desorption tests and X-ray photoelectron spectros-copy (XPS) was conducted to confirm nitrogen doping. Linear sweep voltammetry (LSV) was carried out to investigate OER activity of Co<sub>3</sub>O<sub>4</sub> catalysts. As a result, bare-Co<sub>3</sub>O<sub>4</sub> which has high surface area and small particle size determined by spray pyrolysis showed high activity toward OER.