Electrocatalytic System for the Simultaneous Hydrogen Production and Storage from Methanol

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• 作者：Jesús González-Cobos ; Víctor J. Rico ; Agustı́n R. González-Elipe ; José Luis Valverde ; Antonio de Lucas-Consuegra
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：March 4, 2016
• 年：2016
• 卷：6
• 期：3
• 页码：1942-1951
• 全文大小：605K
• ISSN：2155-5435

文摘

This paper reports a groundbreaking approach for simultaneous hydrogen production and storage that entails catalysis, electrochemistry, surface science, and materials synthesis. A novel electrocatalytic system is developed based on nickel nanocolumnar films of controlled microstructure prepared on K-βAl₂O₃ solid electrolyte supports by oblique angle physical vapor deposition. The outstanding characteristics of this system are a hydrogen storage capacity of up to 19 g of H₂ (100 g of Ni)p>−1p>, which is unparalleled in the literature and the possibility of controlling its release electrochemically, under fixed mild conditions (280 °C and normal pressure). H₂ is produced in situ by methanol steam re-forming on the Ni catalyst, and it spills over onto graphene oxide aggregates formed during the catalytic process, as confirmed by SEM, FTIR, and Raman spectroscopy. The proposed storage mechanism considers a synergetic contribution of both Ni and graphene oxide, promoted by Kp>+p> ions, in enhancing the hydrogen storage capacity of the system.