Physical Vapor Deposition 방법으로 제조된 Al-Ni 전극의 두께가 알칼라인 수전해 수소발생반응에 미치는 영향 연구 (Understanding the Effect on Hydrogen Evolution Reaction in Alkaline Medium of Thickness of Physical Vapor Deposited Al-Ni Electrodes)

서지정보

· 발행기관 : 한국수소및신에너지학회
· 수록지 정보 : 한국수소및신에너지학회논문집 / 28권 / 6호 / 610 ~ 617페이지
· 저자명 : 한원비, 조현석, 조원철, 김창희

초록

This paper presents a study of the effect of thickness of porous Al-Ni electrodes, on the Hydrogen Evolution Reaction (HER) in alkaline media. As varying deposition time at 300 W DC sputtering power, the thickness of the Al-Ni electrodes was controlled from 1 to 20 μm. The heat treatment was carried out in 610oC, followed by selective leaching of the Al-rich phase. XRD studies confirmed the presence of Al3Ni2 intermetallic compounds after the heat treatment, indicating the diffusion of Ni from the Ni-rich phase to Al-rich phase. The porous structure of the Al-Ni electrodes after the selective leaching of Al was also confirmed in SEM-EDS analysis. The double layer capacitance (Cdl) and roughness factor (Rf) of the electrodes were increased for the thicker Al-Ni electrodes. As opposed to the general results in above, there were no further improvements of the HER activity in the case of the electrode thickness above 10 μm. This result may indicate that the Rf is not the primary factor for the HER activity in alkaline media.

영어초록

This paper presents a study of the effect of thickness of porous Al-Ni electrodes, on the Hydrogen Evolution Reaction (HER) in alkaline media. As varying deposition time at 300 W DC sputtering power, the thickness of the Al-Ni electrodes was controlled from 1 to 20 μm. The heat treatment was carried out in 610oC, followed by selective leaching of the Al-rich phase. XRD studies confirmed the presence of Al3Ni2 intermetallic compounds after the heat treatment, indicating the diffusion of Ni from the Ni-rich phase to Al-rich phase. The porous structure of the Al-Ni electrodes after the selective leaching of Al was also confirmed in SEM-EDS analysis. The double layer capacitance (Cdl) and roughness factor (Rf) of the electrodes were increased for the thicker Al-Ni electrodes. As opposed to the general results in above, there were no further improvements of the HER activity in the case of the electrode thickness above 10 μm. This result may indicate that the Rf is not the primary factor for the HER activity in alkaline media.

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