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上传于：2015-12-29

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    188宝金博页面版: Development of a continuous hydrogen generator fueled by ammonia borane for portable fuel cell applications

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    内容提示： Development of a continuous hydrogen generator fueled by ammonia boranefor portable fuel cell applicationsYongmin Kim, Yujong Kim, Shinyoung Yeo, Kibeom Kim, Katherine Jung-Eun Koh, Jung-Eun Seo,Seock Jae Shin, Dae-Ki Choi, Chang Won Yoon * , Suk Woo Nam *Fuel Cell Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-gu, Seoul 136-791, South Koreah i g h l i g h t s g r a p h i c a l a b s t r a c t< A novel H 2 generator fueled byammonia borane is developed.< Dehydrogena...

    文档格式：PDF | 页数：12 | 浏览次数：684 | 上传日期：2015-12-29 23:27:33 | 文档星级：
    Development of a continuous hydrogen generator fueled by ammonia boranefor portable fuel cell applicationsYongmin Kim, Yujong Kim, Shinyoung Yeo, Kibeom Kim, Katherine Jung-Eun Koh, Jung-Eun Seo,Seock Jae Shin, Dae-Ki Choi, Chang Won Yoon * , Suk Woo Nam *Fuel Cell Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-gu, Seoul 136-791, South Koreah i g h l i g h t s g r a p h i c a l a b s t r a c t< A novel H 2 generator fueled byammonia borane is developed.< Dehydrogenation of ammoniaborane is achieved by solvent-mediated thermolyses.< The H 2 generator shows fast load-following capability and rapidresponse time.< The H 2 generator produces H 2autothermally to operate a 200 W ePEMFC stack.a r t i c l e i n f oArticle history:Received 15 October 2012Received in revised form14 November 2012Accepted 15 November 2012Available online 2 December 2012Keywords:Ammonia boraneContinuous hydrogen generationSolvent-mediated thermolysisPolymer electrolyte membrane fuel cella b s t r a c tThermally-induced dehydrogenation from a mixture of ammonia borane (AB) and a chemical promoter,tetraethyleneglycol dimethylether (T4EGDE) (AB:T4EGDE ¼ 79:21, wt%) has been demonstrated as anefficient method for hydrogen production at 85e145? C. We further build on these prior results to createa continuous H 2 generator fueled by solid AB beads. The as-developed H 2 generator releases ca. 2 equiv ofhydrogen autothermally during operation by utilizing excess heat produced from AB dehydrogenationwithout any external heater. A purifying system equipped with acidic filter materials is further utilized toremove gaseous byproducts other than hydrogen. The H 2 generator shows a rapid H 2 -release rate up to3.3 l(H 2 ) min ?1 with fast load-following capability. The as-developed H 2 generator is ultimately inte-grated with a commercial 200 W e polymer electrolyte membrane fuel cell (PEMFC) to test its capability.? 2012 Elsevier B.V. All rights reserved.1. IntroductionChemical hydrides such as ammonia borane (NH 3 BH 3 , AB),sodium borohydride (NaBH 4 , SBH), and carbosilanes have attractedconsiderable attention as hydrogen storage materials for fuel cellapplications. Among these chemical hydrides, aqueous SBH solu-tions have been widely studied as a potential fuel to producehydrogen via hydrolysis in the presence of a number of heteroge-neous catalysts based on cobalt boride [1], nickel boride [2], PteLiCoO 2 [3], Ru [4] and so forth. A hydrogen production systemutilizing SBH solutions offers a number of advantages including: (i)fast H 2 -release kinetics, (ii) facile control for H 2 -release rate, and(iii) no formation of gaseous byproducts. A hydrolysis-based H 2generation system, however, requires a large quantity of water todissolve SBH and further needs a base stabilizer (e.g., NaOH) toprevent autohydrolysis of the SBH fuel, leading to a decrease inhydrogen storage density to 7.3 wt% [5]. In addition, the hydrolyzedbyproducts possess thermodynamically stable BeO bonds that arecostly to regenerate [6].* Corresponding authors. Tel.: þ82 2 958 5274; fax: þ82 2 958 5199.E-mail addresses: cwyoon@kist.re.kr (C.W. Yoon), swn@kist.re.kr, swnam0624@gmail.com (S.W. Nam).Contents lists available at SciVerse ScienceDirectJournal of Power Sourcesjournal homepage: www.elsevier.com/locate/jpowsour0378-7753/$ e see front matter ? 2012 Elsevier B.V. All rights reserved.http://dx.doi.org/10.1016/j.jpowsour.2012.11.045Journal of Power Sources 229 (2013) 170e178

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