Cu_xCo_1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High-Efficiency Hydrolysis of Ammonia-Borane

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• 作者：Kun Feng ; Dr. Jun Zhong ; Binhua Zhao ; Hui Zhang ; Dr. Lai Xu ; Prof. Dr. Xuhui Sun and Prof. Dr. Shuit-Tong Lee
• 刊名：Angewandte Chemie
• 出版年：2016
• 出版时间：September 19, 2016
• 年：2016
• 卷：128
• 期：39
• 页码：12129-12133
• 全文大小：3351K
• ISSN：1521-3757

文摘

Ammonia–borane (AB) is an excellent material for chemical storage of hydrogen. However, the practical utilization of AB for production of hydrogen is hindered by the need of expensive noble metal-based catalysts. Here, we report Cu_xCo_1−xO nanoparticles (NPs) facilely deposited on graphene oxide (GO) as a low-cost and high-performance catalyst for the hydrolysis of AB. This hybrid catalyst exhibits an initial total turnover frequency (TOF) value of 70.0 (H₂) mol/(Cat-metal) mol⋅min, which is the highest TOF ever reported for noble metal-free catalysts, and a good stability keeping 94 % activity after 5 cycles. Synchrotron radiation-based X-ray absorption spectroscopy (XAS) investigations suggested that the high catalytic performance could be attributed to the interfacial interaction between Cu_xCo_1−xO NPs and GO. Moreover, the catalytic hydrolysis mechanism was studied by in situ XAS experiments for the first time, which reveal a significant water adsorption on the catalyst and clearly confirm the interaction between AB and the catalyst during hydrolysis.