Towards the development of a hydrogen battery

Boddien, Albert; Federsel, Christopher; Sponholz, P.; Mellmann, Dörthe; Jackstell, Ralf; Junge, Henrik; Laurenczy, Gábor; Beller, Matthias

doi:10.1039/c2ee22043a

Cited by 156 publications

(119 citation statements)

References 48 publications

(14 reference statements)

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“…Therefore, one alternative is chemical hydrogen storage in molecular materials in which the dihydrogen is stored in the form of hydridic and protic hydrogen. Examples are metal hydrides [4][5][6] , ammonia borane derivatives 2,3,7 , formic acid 2,[8][9][10][11][12][13][14][15][16][17] and methanol [18][19][20][21] . Ammonia borane derivatives have a good weight efficiency (r19.4 wt% H 2 ) 2,3,7 , but the solid spentfuels are hardly recyclable.…”

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confidence: 99%

Selective and mild hydrogen production using water and formaldehyde

et al. 2014

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With the increased efforts in finding new energy storage systems for mobile and stationary applications, an intensively studied fuel molecule is dihydrogen owing to its energy content, and the possibility to store it in the form of hydridic and protic hydrogen, for example, in liquid organic hydrogen carriers. Here we show that water in the presence of paraformaldehyde or formaldehyde is suitable for molecular hydrogen storage, as these molecules form stable methanediol, which can be easily and selectively dehydrogenated forming hydrogen and carbon dioxide. In this system, both molecules are hydrogen sources, yielding a theoretical weight efficiency of 8.4% assuming one equivalent of water and one equivalent of formaldehyde. Thus it is potentially higher than formic acid (4.4 wt%), as even when technical aqueous formaldehyde (37 wt%) is used, the diluted methanediol solution has an efficiency of 5.0 wt%. The hydrogen can be efficiently generated in the presence of air using a ruthenium catalyst at low temperature.

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confidence: 99%

Selective and mild hydrogen production using water and formaldehyde

et al. 2014

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“…To identify the most-effective d 6 (11) performed very well and yielded TONs of more than 3650 and 8700, respectively. These catalysts were shown to be remarkably air-tolerant and displayed activity under moderately acidic conditions.…”

Section: Discussionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7] The reversible catalytic decomposition of formic acid yields dihydrogen and carbon dioxide and is mediated by organometallic catalysts. In particular, d 6 pianostool complexes have demonstrated their versatility as formate dehydrogenase catalysts. [8][9][10][11][12][13][14][15][16] However, these studies are typically performed with high formic acid concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Formate Dehydrogenase Activity of Three‐Legged Pianostool Complexes in Dilute Aqueous Solution

et al. 2014

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Formic acid is an attractive means to reversibly store dihydrogen. In this context, d6 pianostool complexes rank among the most‐effective formate dehydrogenase catalysts. With biologically generated formic acid in mind, we evaluated the performances of iridium‐based pianostool complexes bearing a cooperative ligand, which are known to catalyze formate decomposition. Interestingly, the phenylpyrazole‐derived catalyst [Cp*Ir(phenpz)(OH2)]+ (7, Cp* = pentamethylcyclopentadienyl, phenpz = 1‐phenylpyrazole) compares favourably with the very best systems [Cp*Ir(phenpzCO2H)H2O]+ [8, phenpzCO2H = 4‐(pyrazol‐1‐yl)benzoic acid] and [Cp*Ir(imim)H2O]2+ [11, imim = 2,2′‐bis(4,5‐dimethylimidazole)]. These catalysts display remarkable air tolerance, recyclability and activity under dilute aqueous conditions.

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“…[14,15] However,t he similarb icarbonate hydrogenation reaction [16][17][18][19][20][21] and, more significantly,i ts interconnection with the formate dehydrogenation reaction remain largely unexplored. [22][23][24] Interestingly most published reports focused on sodiuma nd potassium salts as hydrogen carriers while the cesium salts were largely neglected, possibly owing to their decreased gravimetric hydrogen density (largera tomic weight of the metal cation) as well as the lower natural abundance of cesium metal. [25] However,t he former can be largelyc ounterbalanced by the increased water solubilityo ft he cesium salts as discussed in detail below.O ne of the few studies on hydrogen releasef rom cesium salts was published by Onsager et al, who postulated that formates alts derived fromcarbon monoxide and different carbonates were potential intermediates for hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

A Viable Hydrogen Storage and Release System Based on Cesium Formate and Bicarbonate Salts: Mechanistic Insights into the Hydrogen Release Step

2015

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The front cover artwork for Issue 15/2015 is provided by the GCEE-Groupo fC atalysis for Energy and Environment, LCOM, EPFL, Switzerland. The image shows as afe and effective method for storing hydrogeni nc esium formate (CsOOCH) solutions. The oppositer eactiont akesp lace upon hydrogenation of cesium bicarbonate (CsHCO 3), requiringn oc hange of solvent , catalyst, or pH. See the Full Paper itself at http://dx.

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Towards the development of a hydrogen battery

Cited by 156 publications

References 48 publications

Selective and mild hydrogen production using water and formaldehyde

Selective and mild hydrogen production using water and formaldehyde

Evaluation of the Formate Dehydrogenase Activity of Three‐Legged Pianostool Complexes in Dilute Aqueous Solution

A Viable Hydrogen Storage and Release System Based on Cesium Formate and Bicarbonate Salts: Mechanistic Insights into the Hydrogen Release Step

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