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Water Electrolysis at the Thermodynamic Limit

出版	Florida State University, 2007
URL	http://books.google.com.hk/books?id=YPRlAQAACAAJ&hl=&source=gbs_api

註釋ABSTRACT: Metal oxide catalysts for alkaline water electrolysis were created through cathodic electrodeposition and the deposition variables were explored. It was discovered that the use of ammonium electrolytes and higher current densities during deposition improved catalytic kinetic performance for the oxygen and hydrogen evolution reactions. A NiFe oxide catalyst was developed with a greater than 99 % ideal charge transfer coefficient for oxygen evolution and a NiV oxide catalyst was developed with a greater than 99.9 % ideal charge transfer coefficient. Combined, the NiFe and NiV catalysts catalyzed water electrolysis at greater than 99 % efficiency below 10 mA/cm^2. The NiFe oxide was characterized as being both highly conductive and highly disordered. NiFe, CoFe, and NiCo oxide oxygen evolution catalytic mechanisms were elucidated with electrochemical impedance spectroscopy. The relationship between the charge transfer coefficient of the Butler-Volmer model and the charge transfer resistance of electrochemical impedance spectroscopy was empirically demonstrated. The distortions of impedance on non-linear systems was demonstrated and discussed.