Optimization of biomass-based carbon materials for hydrogen storage

Hydrogen storage in activated carbons (ACs) has proven to be a realistic alternative to compression and liquefaction. Adsorption capacities up to 5.8 wt.% have indeed been obtained. The amount of adsorbed hydrogen depends on the textural properties of ACs, such as specific surface area and total pore volume. The modified Dubinin-Astakhov (MDA) equation proved to be a good analytical tool for describing hydrogen adsorption in a wide range of pressures and temperatures and for several adsorbents. The parameters of this model have been found to be somehow related to the textural properties of the adsorbent. Thus, we applied this model to understand better hydrogen adsorption on ACs over a wide range of pressures in relation to the textural properties of the ACs. We applied the MDA equation to evaluate also the isosteric heat of hydrogen adsorption, which was found to be in the range of 5 to 9 kJ mol-1. We compared the results obtained by applying the MDA equation with those obtained by both the sorption isosteric method and the Sips equation. This allowed finding the temperature dependence of the isosteric heat of adsorption, as well as its variation with respect to the textural properties of the ACs.

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“…a) Increase of maximum of hydrogen excess adsorption with A BET and b) maximum of excess adsorption isotherms[63,[65][66][67][68][69][70] …”

mentioning

confidence: 99%

Application of the modified Dubinin-Astakhov equation for a better understanding of high-pressure hydrogen adsorption on activated carbons

Sdanghi

Schaefer

Maranzana

et al. 2020

International Journal of Hydrogen Energy

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“…Several energy storage devices and processes are demonstrated in the literature employing activated charcoal and graphite materials [44][45][46]. Thus in the present work performance of dual chambered MFCs and its life time is demonstrated employing activated charcoal and graphite electrodes.…”

Section: Perspectives and Summarymentioning

confidence: 95%

Equivalent circuit modeling of microbial fuel cells using impedance spectroscopy

Sindhuja

Kumar

Sudha

et al. 2016

Journal of Energy Storage

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“…With an exceptionally large surface area, a microporous nature and the possibility of an economic and scalable production, ACs are excellent candidates in efficient hydrogen storage systems [58,[87][88][89][90][91][92][93][94][95][96][97][98][99][100][101][102][103]. One of the most important advantages of ACs is that they can be produced from a wide variety of low-cost and renewable raw materials, such as agricultural waste or lignocellulosic materials in general, which is an important advantage compared to other carbon materials [104].…”

Section: Activated Carbonsmentioning

confidence: 99%

Characterization of Carbon Materials for Hydrogen Storage and Compression

Sdanghi

Canevesi

Celzard

et al. 2020

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Carbon materials have proven to be a suitable choice for hydrogen storage and, recently, for hydrogen compression. Their developed textural properties, such as large surface area and high microporosity, are essential features for hydrogen adsorption. In this work, we first review recent advances in the physisorption characterization of nanoporous carbon materials. Among them, approaches based on the density functional theory are considered now standard methods for obtaining a reliable assessment of the pore size distribution (PSD) over the whole range from narrow micropores to mesopores. Both a high surface area and ultramicropores (pore width < 0.7 nm) are needed to achieve significant hydrogen adsorption at pressures below 1 MPa and 77 K. However, due to the wide PSD typical of activated carbons, it follows from an extensive literature review that pressures above 3 MP are needed to reach maximum excess uptakes in the range of ca. 7 wt.%. Finally, we present the adsorption–desorption compression technology, allowing hydrogen to be compressed at 70 MPa by cooling/heating cycles between 77 and 298 K, and being an alternative to mechanical compressors. The cyclic, thermally driven hydrogen compression might open a new scenario within the vast field of hydrogen applications.

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Optimization of biomass-based carbon materials for hydrogen storage

Cited by 54 publications

References 41 publications

Application of the modified Dubinin-Astakhov equation for a better understanding of high-pressure hydrogen adsorption on activated carbons

Application of the modified Dubinin-Astakhov equation for a better understanding of high-pressure hydrogen adsorption on activated carbons

Equivalent circuit modeling of microbial fuel cells using impedance spectroscopy

Characterization of Carbon Materials for Hydrogen Storage and Compression

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