Management of excess energy in a photovoltaic/grid system by production of clean hydrogen

Dahbi, Sanae; Aziz, Abdelhak; Messaoudi, Abdelhafid; Mazozi, Imane; Kassmi, K.; Benazzi, Naima

doi:10.1016/j.ijhydene.2017.11.022

Cited by 40 publications

(14 citation statements)

References 24 publications

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“…However, the volume efficiency of H 2 is significantly lower than that of gasoline (0.0108 vs 34.8 MJ/kg), and hydrogen has a wide explosion limit concentration range (4–75%) in air . Therefore, technology for the high-density storage and safe transportation of hydrogen must be developed quickly to shift to a hydrogen-energy-based society. − ,− Hydrogen storage remains a significant challenge for the hydrogen economy because of the lack of effective high-capacity H 2 carriers. , …”

Section: Introductionmentioning

confidence: 99%

Mechanism of Hydrogen Storage in the Graphene Nanoflake–Lithium–H₂ System

Tachikawa

Iyama

2019

J. Phys. Chem. C

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Carbon materials, such as graphene nanoflakes, carbon nanotubes, and fullerenes, can be used for hydrogen storage. Alkali doping of these materials generally increases their H2-storage density. In this study, the interaction of hydrogen molecules with Li-doped graphene nanoflakes was systematically investigated using density functional theory (DFT). A large polycyclic aromatic hydrocarbon composed of 37 benzene rings (referred to as GR) was used as a model of a graphene nanoflake, and GR–Li–(H2) n and GR–Li+–(H2) n (n = 0–13) clusters were used as hydrogen storage systems. The first and second coordination shells of H2 around GR–Li were saturated at n = 3 and 7, respectively. The binding energy of H2 to GR–Li decreased with increasing n, reaching a limiting value at n = 10. For GR–Li+–(H2) n , similar results were obtained and the Li atom on GR was shown to be activated by electron transfer from Li to GR. The diffusion barrier of Li+ on GR decreased upon addition of H2 to Li+ from 6.35 (n = 0) to 3.62 kcal/mol (n = 4). The mechanism of H2 addition is discussed herein based on the calculated results.

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Section: Introductionmentioning

confidence: 99%

Mechanism of Hydrogen Storage in the Graphene Nanoflake–Lithium–H₂ System

Tachikawa

Iyama

2019

J. Phys. Chem. C

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“…An interesting solution which has been on the table for more than twenty years is the question of hydrogen [20]. Hydrogen has been under continuous investigation due to its potential to be a key player in the energy transition, mainly because of the versatility of this energy carrier, which can be integrated in different areas such as power grids [21], transport [22], heating [23], fuel-cell electric vehicles, and energy storage [24]. Nevertheless, and unlike fossil fuels, molecular hydrogen (H 2 ) is not present in large deposits on the earth's crust, nor is it found in the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Energy Sustainability Analysis (ESA) of Energy-Producing Processes: A Case Study on Distributed H2 Production

Gómez-Camacho

Ruggeri

2019

Sustainability

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In the sustainability context, the performance of energy-producing technologies, using different energy sources, needs to be scored and compared. The selective criterion of a higher level of useful energy to feed an ever-increasing demand of energy to satisfy a wide range of endo- and exosomatic human needs seems adequate. In fact, surplus energy is able to cover energy services only after compensating for the energy expenses incurred to build and to run the technology itself. This paper proposes an energy sustainability analysis (ESA) methodology based on the internal and external energy use of a given technology, considering the entire energy trajectory from energy sources to useful energy. ESA analysis is conducted at two levels: (i) short-term, by the use of the energy sustainability index (ESI), which is the first step to establish whether the energy produced is able to cover the direct energy expenses needed to run the technology and (ii) long-term, by which all the indirect energy-quotas are considered, i.e., all the additional energy requirements of the technology, including the energy amortization quota necessary for the replacement of the technology at the end of its operative life. The long-term level of analysis is conducted by the evaluation of two indicators: the energy return per unit of energy invested (EROI) over the operative life and the energy payback-time (EPT), as the minimum lapse at which all energy expenditures for the production of materials and their construction can be repaid to society. The ESA methodology has been applied to the case study of H2 production at small-scale (10–15 kWH2) comparing three different technologies: (i) steam-methane reforming (SMR), (ii) solar-powered water electrolysis (SPWE), and (iii) two-stage anaerobic digestion (TSAD) in order to score the technologies from an energy sustainability perspective.

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“…The the off-grid working mode and DC bus structure are adopted. The main components include photovoltaic modules, proton exchange membrane fuel cells, proton exchange membrane water electrolysis cells, storage batteries, hydrogen tanks, power converters and controlling devices [9]. In the system, each component is connected to the DC bus through a power converter.…”

Section: The Pvfcmentioning

confidence: 99%

Research on fuel cell based on photovoltaic technology

Liu

2020

THERM SCI

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To investigate the hybrid thermal energy storage in photovoltaic fuel cells, a hybrid thermal energy storage control system for photovoltaic fuel cells is explored model construction and simulation. The correlations between the system components and the external factors are analyzed. The results show a positive correlation of the state of charges between the storage battery and the hydrogen storage tank at 0-15 hours, while no correlation exists between them at 15-35 hours. Meanwhile, the sunshine intensity and the photovoltaic output share a positive correlation. In summary, the hybrid thermal energy storage system is critical for photovoltaic fuel cells. The charging and discharging of the battery depends on the photovoltaic intensity. The constructed grouping management model for storage battery is outstanding and satisfies the operational requirements of photovoltaic fuel cells.

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Management of excess energy in a photovoltaic/grid system by production of clean hydrogen

Cited by 40 publications

References 24 publications

Mechanism of Hydrogen Storage in the Graphene Nanoflake–Lithium–H₂ System

Mechanism of Hydrogen Storage in the Graphene Nanoflake–Lithium–H₂ System

Energy Sustainability Analysis (ESA) of Energy-Producing Processes: A Case Study on Distributed H2 Production

Research on fuel cell based on photovoltaic technology

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Management of excess energy in a photovoltaic/grid system by production of clean hydrogen

Cited by 40 publications

References 24 publications

Mechanism of Hydrogen Storage in the Graphene Nanoflake–Lithium–H2 System

Mechanism of Hydrogen Storage in the Graphene Nanoflake–Lithium–H2 System

Energy Sustainability Analysis (ESA) of Energy-Producing Processes: A Case Study on Distributed H2 Production

Research on fuel cell based on photovoltaic technology

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Product

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Mechanism of Hydrogen Storage in the Graphene Nanoflake–Lithium–H₂ System

Mechanism of Hydrogen Storage in the Graphene Nanoflake–Lithium–H₂ System