Optimised hydrogen production by a photovoltaic-electrolysis system DC/DC converter and water flow controller

Dahbi, Sanae; Aboutni, Rachid; Aziz, Azlina Abdul; Benazzi, Naima; Elhafyani, Mohamed Larbi; Kassmi, K.

doi:10.1016/j.ijhydene.2016.05.111

Cited by 54 publications

(11 citation statements)

References 21 publications

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“…In other cases where there is a mismatch between the PV modules output voltage and the electrolyzer operating voltage, incorporating a DC–DC converter in the circuit is beneficial to reach acceptable STH values between 5.7 and 10.5%. 9,10 Similar results were also highlighted by the work of Cabezas et al 11 They demonstrated that for a directly coupled PV–electrolyzer system, optimal design configurations correspond to cases where the PV modules maximum power point (MPP) matches the electrolyzer operating voltage. They also demonstrated that using state-of-art electrolyzers coupled with suitable design of PV modules can increase the system's coupling efficiency.…”

Section: Introductionsupporting

confidence: 58%

Optimal design of a coupled photovoltaic–electrolysis-battery system for hydrogen generation

Alobaid

Adomaitis

2023

Sustainable Energy Fuels

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Section: Introductionsupporting

confidence: 58%

Optimal design of a coupled photovoltaic–electrolysis-battery system for hydrogen generation

Alobaid

Adomaitis

2023

Sustainable Energy Fuels

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“…Also, an integration of multi-junction PV with electrolysis could achieve a high efficiency, around 16% [170]. Moreover, a study showed that the optimization of hydrogen generation could be attained using a DC/DC buck transformer with an MPPT and by controlling the water flux inserted in the electrolysis [171]. Using a DC/DC buck transformer can enhance the acclimation between the electrolysis and the PV generator, and the control of water flux can enhance hydrogen generation.…”

Section: Thermal Techniquementioning

confidence: 99%

An Overview of Hydrogen Energy Generation

AlZohbi

2024

ChemEngineering

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The global issue of climate change caused by humans and its inextricable linkage to our present and future energy demand presents the biggest challenge facing our globe. Hydrogen has been introduced as a new renewable energy resource. It is envisaged to be a crucial vector in the vast low-carbon transition to mitigate climate change, minimize oil reliance, reinforce energy security, solve the intermittency of renewable energy resources, and ameliorate energy performance in the transportation sector by using it in energy storage, energy generation, and transport sectors. Many technologies have been developed to generate hydrogen. The current paper presents a review of the current and developing technologies to produce hydrogen from fossil fuels and alternative resources like water and biomass. The results showed that reformation and gasification are the most mature and used technologies. However, the weaknesses of these technologies include high energy consumption and high carbon emissions. Thermochemical water splitting, biohydrogen, and photo-electrolysis are long-term and clean technologies, but they require more technical development and cost reduction to implement reformation technologies efficiently and on a large scale. A combination of water electrolysis with renewable energy resources is an ecofriendly method. Since hydrogen is viewed as a considerable game-changer for future fuels, this paper also highlights the challenges facing hydrogen generation. Moreover, an economic analysis of the technologies used to generate hydrogen is carried out in this study.

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“…This is done by interplaying with the voltage and current characteristics of PV at a similar power output. As a result, the excess (unused) voltage from the PV is stepped down with an enhancement in the total current at the same time. − Although this procedure is widely adopted by the PV–electrolysis community, the high cost and the additional resistance losses due to the power electronics adversely affect the economics of the overall process . Second, the operating point of an electrolyzer can be matched using a dual-junction cell, which generates a maximum power at about ∼2.0 V, sufficient to run an alkaline electrolyzer.…”

Section: Introductionmentioning

confidence: 99%

Sixteen Percent Solar-to-Hydrogen Efficiency Using a Power-Matched Alkaline Electrolyzer and a High Concentrated Solar Cell: Effect of Operating Parameters

et al. 2020

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The effect of electrode area, electrolyte concentration, temperature, and light intensity (up to 218 sun) on PV electrolysis of water is studied using a high concentrated triple-junction (3-J) photovoltaic cell (PV) connected directly to an alkaline membrane electrolyzer (EC). For a given current, the voltage requirement to run an electrolyzer increases with a decrease in electrode sizes (4.5, 2.0, 0.5, and 0.25 cm2) due to high current densities. The high current density operation leads to high Ohmic losses, most probably due to the concentration gradient and bubble formation. The EC operating parameters including the electrolyte concentration and temperature reduce the voltage requirement by improving the thermodynamics, kinetics, and transport properties of the overall electrolysis process. For a direct PV–EC coupling, the maximum power point of PV (P max) is matched using EC I–V (current–voltage) curves measured for different electrode sizes. A shift in the EC I–V curves toward open-circuit voltage (V oc) reduces the P op (operating power) to hydrogen efficiencies due to the increased voltage losses above the equilibrium water-splitting potential. The solar-to-hydrogen (STH) efficiencies remained comparable (∼16%) for all electrode sizes when the operating current (I op) was similar to the short-circuit current (I sc) irrespective of the operating voltage (V op), electrolyzer temperature, and electrolyte concentration.

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Optimised hydrogen production by a photovoltaic-electrolysis system DC/DC converter and water flow controller

Cited by 54 publications

References 21 publications

Optimal design of a coupled photovoltaic–electrolysis-battery system for hydrogen generation

Optimal design of a coupled photovoltaic–electrolysis-battery system for hydrogen generation

An Overview of Hydrogen Energy Generation

Sixteen Percent Solar-to-Hydrogen Efficiency Using a Power-Matched Alkaline Electrolyzer and a High Concentrated Solar Cell: Effect of Operating Parameters

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