Hydrogen energy, economy and storage: Review and recommendation

Abe, John Olorunfemi; Popoola, A. P. I.; Ajenifuja, Emmanuel; Popoola, Olawale

doi:10.1016/j.ijhydene.2019.04.068

Cited by 2,319 publications

(922 citation statements)

References 109 publications

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“…It is well known that hydrogen production is directly proportional to final metabolites such as acetic acid and butyric acid [33]. However, the accumulation of ethanol had a negative effect on hydrogen production [34]. Therefore, with the initial pH of 6.5, the content was higher.…”

Section: Effects Of Initial Ph Values On Vfasmentioning

confidence: 99%

Enhancement of pH values stability and photo-fermentation biohydrogen production by phosphate buffer

Guo

Wang

et al. 2020

Bioengineered

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The main aim of this study was to investigate the effects of the initial pH values of the buffer on photofermentation biohydrogen production. Hydrogen production and the kinetics of it under different initial pH values were analyzed. Effects of initial pH values on reducing sugar consumption, hydrogen production rate, and byproduct production were evaluated at initial pH values of 5-7. The results showed that initial pH values of phosphate buffer had a significant effect on biohydrogen production via photo-fermentation. With the initial pH value of phosphate buffer at 6.0, the cumulative hydrogen production reached its maximum, 569.6 mL. The maximum hydrogen production rate was 23.96 mL/h at the initial pH value of 6.5. With the initial pH values at 5.0 and 7.5, the maximum hydrogen production rates were becoming lower, only 5.59 mL/h and 5.42 mL/h, respectively. And with the increase in pH values, the peak period of hydrogen production was gradually delayed, indicating that the alkaline environment had a negative effect on the ability of photosynthetic bacteria. This study revealed the influence of phosphate buffer initial pH values on the biohydrogen production via photo-fermentation and aimed to provide a scientific reference for further improving the theory and technology for biohydrogen production from biomass. ARTICLE HISTORY

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Section: Effects Of Initial Ph Values On Vfasmentioning

confidence: 99%

Enhancement of pH values stability and photo-fermentation biohydrogen production by phosphate buffer

Guo

Wang

et al. 2020

Bioengineered

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“…The storage and transportation of hydrogen is a key problem to be solved by the hydrogen economy [1][2][3][4][5]. This problem is especially acute when using low-temperature fuel cells with a proton-exchange membrane (LT-PEMFC) in hard-to-reach and unelectrified areas when hydrogen has to be delivered in a compact form by aircraft transport.…”

Section: Introductionmentioning

confidence: 99%

Solid-State NaBH4 Composites as Hydrogen Generation Material: Effect of Thermal Treatment of a Catalyst Precursor on the Hydrogen Generation Rate

et al. 2020

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Solid-state composites based on sodium borohydride (NaBH4) were studied for applications as hydrogen generation materials. Hydrates of cobalt and nickel chlorides subjected to a thermal treatment were added to the composites as catalyst precursors. Using thermal analysis and FTIR spectroscopy, it was shown that the amount of water removed increases with the increasing temperature. Herewith, the water molecules that remained in the samples were strongly bound to the metal and isolated from each other. According to the ultraviolet–visible (UV-vis) spectroscopy data, with the increasing temperature of the thermal pretreatment there took place a substitution of a portion of water molecules by chloride ions in the nearest environment of the metal. It appeared that it was the resulting weakening of the electrostatic field on metal that was mainly responsible for the formation of a more finely dispersed catalytic phase of amorphous cobalt boride in the reaction medium under the action of sodium borohydride. The smaller particles of the active components led to a faster rate of gas generation when water was added to the solid-state NaBH4 composites. This trend remained for both the cobalt and the nickel catalytic systems even when the activity was calculated per gram of the metal. Thus, for the preparation of solid-state NaBH4 composites, hydrates of cobalt and nickel chlorides with a low content of water should be used.

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“…Low-cost manufacturing, safe storage, and transportation, as well as the effective conversion of hydrogen are the basic requirements for the realization of the large-scale application of hydrogen energy (Baykara, 2018;Abe et al, 2019;Staffell et al, 2019;Wei et al, 2019;Xu et al, 2019). Therefore, it is essential to explore a novel and high-capacity hydrogen storage material.…”

Section: Introductionmentioning

confidence: 99%

Constructing Core-Shell Co@N-Rich Carbon Additives Toward Enhanced Hydrogen Storage Performance of Magnesium Hydride

Wang

Deng

2020

Front. Chem.

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Magnesium hydride (MgH 2) is regarded as a promising solid-state hydrogen storage material, on account of its moderate price and high gravimetric capacity. However, MgH 2 's inferior kinetic of hydrogen release impedes its widespread application. In this work, we use core-shell Co@N-rich carbon (CoNC) additive as catalysts to ameliorate the performances of MgH 2. The surface morphologic structures and hydrogen desorption kinetics of different MgH 2-CoNC composites are systematically studied. We find that MgH 2-5 wt% CoNC with carbon contents of 17% (CoNC0) composites exhibit better hydrogen desorption performance. At 325 • C, the MgH 2-5 wt% CoNC0 composites can release up to 6.58 wt% of H 2 in 5 min, which is much higher than 0.3 wt% for pure MgH 2. Our results demonstrate that importing the core-shell structured catalysts can effectively enhance the hydrogen release kinetics.

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Hydrogen energy, economy and storage: Review and recommendation

Cited by 2,319 publications

References 109 publications

Enhancement of pH values stability and photo-fermentation biohydrogen production by phosphate buffer

Enhancement of pH values stability and photo-fermentation biohydrogen production by phosphate buffer

Solid-State NaBH4 Composites as Hydrogen Generation Material: Effect of Thermal Treatment of a Catalyst Precursor on the Hydrogen Generation Rate

Constructing Core-Shell Co@N-Rich Carbon Additives Toward Enhanced Hydrogen Storage Performance of Magnesium Hydride

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