Oxalic Acid Promoted Hydrolysis of Sodium Borohydride for Transition Metal Free Hydrogen Generation
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https: //doi. org/10.1007/s11595-020-2311-8
Oxalic Acid Promoted Hydrolysis of Sodium Borohydride for Transition Metal Free Hydrogen Generation PENG Yuanting1, ZENG Hui1, SHI Yu2, XU Jinrong4, XIE Lei2*, CHEN Jun3*, ZHENG Jie4, LI Xingguo4
(1. Wuhan Institute of Marine Electric Propulsion, Wuhan 430064, China;2. Sunan Institute for Molecular Engineering, Peking University, Changshu Hi-Tech Industrial Development Zone, Changshu 215500, China; 3. Institute of Materials, China Academy of Engineering Physics, Jiangyou 621908, China; 4.Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China)
Abstract: We reported a low cost, high efficiency hydrogen generation method from NaBH4 hydrolysis promoted by oxalic acid. NaBH4 and H2C2O4 were premixed and hydrogen generation was initiated by adding water into the solid mixture. H2C2O4 was selected as the acid promotor due to its solid state and low mass per proton. The effect of reactant ratio on the hydrogen yield and hydrogen storage density was investigated. With optimized reactant ratio, high gravimetric hydrogen storage up to 4.4wt% based on all the reactants can be achieved with excellent hydrogen generation kinetics. Key words: hydrogen generation; sodium borohydride; oxalic acid; hydrolysis
1 Introduction Proton exchange membrane fuel cells (PEMFCs) are high efficiency, zero emission power sources which are highly attractive for both stationary and mobile applications. High density, high safety and easy-to-use hydrogen storage technology is of key importance for the operation of PEMFCs. Reversible hydrogen storage technologies have been extensively studied over the last two decades. However, it remains challenging to meet the requirement of practical application. For many low power, portable PEMFC applications, it is more convenient to use single-use hydrogen sources from chemical reactions. Hydrolysis of sodium borohydride is a well established technology for on-site hydrogen © Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Mar. 10, 2020; Accepted: May 24, 2020) PENG Yuanting(彭元亭): Ph D; Research Fellow; E-mail: [email protected] *Corresponding authors: XIE Lei(谢镭): Ph D; Research Fellow;E-mail: [email protected]; CHEN Jun(陈均): Ph D; Assistant Research Fellow; E-mail: [email protected] Funded by the Ministry of Science and Technology (MOST) of China (No. 2018YFB1502104), the Natural Science Foundation of China (No. 21771006) and the Equipment Development Department of People's Republic of China Central Military Commission (Preresearch Project of the Thirteenth Five-Year Plan, No. 41421020103)
generation, which is highly suited for low to medium power hydrogen fuel cells for both military and civil applications[1-4]. Hydrolysis of NaBH4 (Eq.(1)) provides a highly attractive hydrogen storage capacity of 7.34wt% based on all the reactants. NaBH4 + 4H2O → NaBO2·2H2O + 4H2
(1)
The hydrogen storage capaci
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