The Experts below are selected from a list of 15294 Experts worldwide ranked by ideXlab platform
Michihisa Koyama - One of the best experts on this subject based on the ideXlab platform.
-
battery assisted low Cost Hydrogen Production from solar energy rational target setting for future technology systems
International Journal of Hydrogen Energy, 2019Co-Authors: Yasunori Kikuchi, Michihisa Koyama, Masakazu Sugiyama, Takayuki IchikawaAbstract:Abstract The massive implementation of renewable energy requires sophisticated assessments considering the combination of feasible technology options. In this study, a techno-economic analysis was conducted for Hydrogen Production from photovoltaic power generation (PV) utilizing a battery-assisted electrolyzer. The installed capacity of each component technology was optimized for the wide range of unit Costs of electricity from the PV, battery, and proton-exchange membrane electrolyzer. Leveling of PV output by battery, the necessary capacity of electrolyzer is suppressed and the operating ratio of electrolyzer increases. The battery-assist will result in a lower Hydrogen Production Cost when the benefit associated with the smaller capacity and higher operation ratio of the electrolyzer exceeds the necessary investment for battery installation. The results from this study indicated the Cost of Hydrogen as low as 17 to 27 JPY/Nm3 using a combination of technologies and the achievement of ambitious individual Cost targets for batteries, PV, and electrolyzers.
Christine Mansilla - One of the best experts on this subject based on the ideXlab platform.
-
Economic competitiveness of off-peak Hydrogen Production today – A European comparison
Energy, 2013Co-Authors: Christine Mansilla, J. Louyrette, S. Albou, Cyril Bourasseau, S. DautremontAbstract:Hydrogen has a wide range of applications. In view of the environmental benefits, Hydrogen can be produced by decarbonized means. When alkaline electrolysis is the selected process, extra value is offered by flexible operation that could bring both; an opportunity to reduce the Cost of Hydrogen produced (by consuming electricity during off-peak hours, and stopping the process during peak hours) and also a complementary tool to help balancing of the electric system. This paper assesses the profitability of market-driven operation for three different markets: France, Germany and Spain, with an analysis on the spot market. The market that exhibits the biggest potential in terms of profitability thanks to flexible operation is the French one, for each studied year. France is also the country that has the smallest installed renewable capacity amongst three considered countries. The gain on the Hydrogen Production Cost allowed by the optimization is less than 3%. Hence, market-driven operation does not seem highly favourable to valorize fluctuating Hydrogen Production, when only the market price opportunities are considered. The balancing tool provided by the electrolysis system needs to be specifically valorized, in order to make flexible operation profitable.
-
reducing the Hydrogen Production Cost by operating alkaline electrolysis as a discontinuous process in the french market context
International Journal of Hydrogen Energy, 2011Co-Authors: Christine Mansilla, S. Dautremont, Shoai B Tehrani, G Cotin, Stefanie Avril, E BurkhalterAbstract:The possible reduction of the Hydrogen Production Cost when operating alkaline electrolysers in a discontinuous way, in order to benefit from low electricity prices, is investigated. Beside the insights about the electricity market (prices do not correlate the demand; they are related to the supply-and-demand hardness), advances in modelling discontinuous operation are proposed. An optimum Production Cost is found that induces a profit of 4%, with regard to a plant that would work continuously. Specific attention should be given to related overCosts: additional degradation due to frequent transitions from the minimum electrolyser load to the nominal one, higher maintenance needs, and Hydrogen storage Costs. Such an operating mode would also greatly benefit from a reduction of the electrolyser prices. However, the state-of-the-art as regards the electrolyser minimum loads and transition time appears satisfactory.
-
Plant sizing and evaluation of Hydrogen Production Costs from advanced processes coupled to a nuclear heat source: Part II: Hybrid-sulphur cycle
International Journal of Hydrogen Energy, 2010Co-Authors: J. Leybros, Christine Mansilla, A. Saturnin, T. Gilardi, P. CarlesAbstract:Abstract Hydrogen demand is already strong. It should significantly increase in the next few years due to the refinery industry's growing needs and new applications such as synthetic fuel or biofuel Production. To meet the demand advanced processes are being developed throughout the world in a sustainability context. Among the most studied ones are thermochemical cycles: the sulphur–iodine and hybrid-sulphur cycles. For each of these processes, a thorough study was carried out from the flowsheet development to the final Hydrogen Production Cost assessment, through the sizing and Costing of the equipment, providing some insights about the process economic competitiveness given the current state of knowledge. This paper presents the analysis conducted for the hybrid-sulphur cycle, which leads to a Hydrogen Production Cost around 6.6 €/kg. The main contributions to that Cost are discussed.
-
Plant sizing and evaluation of Hydrogen Production Costs from advanced processes coupled to a nuclear heat source. Part I: Sulphur–iodine cycle
International Journal of Hydrogen Energy, 2010Co-Authors: J. Leybros, Christine Mansilla, A. Saturnin, T. Gilardi, P. CarlesAbstract:Abstract Hydrogen demand is already strong. It should significantly increase in the next few years due to the refinery industry's growing needs and new applications such as synthetic fuel or biofuel Production. To meet the demand, advanced processes are being developed throughout the world in a sustainability context. Among the most studied ones are thermochemical cycles: the sulphur–iodine and hybrid-sulphur cycles. For each of these processes, a thorough study was carried out from the flowsheet development to the final Hydrogen Production Cost assessment, through the sizing and Costing of the equipment, providing some insights about the process economic competitiveness given the current state of knowledge. This paper presents the analysis conducted for the sulphur–iodine cycle, which leads to a Hydrogen Production Cost around 12 €/kg. The main contributions to that Cost are discussed.
-
ON THE POSSIBILITIES OF PRODUCING Hydrogen BY HIGH TEMPERATURE ELECTROLYSIS OF WATER STEAM SUPPLIED FROM BIOMASS OR WASTE INCINERATION UNITS
International Journal of Green Energy, 2008Co-Authors: Rodrigo Rivera-tinoco, Christine Mansilla, Chakib Bouallou, François WerkoffAbstract:The incineration of biomass and waste is considered to produce water steam, which then would feed the High Temperature Electrolysis (HTE) process in order to produce Hydrogen. For these energy sources, in a French context, results show that water steam Production Cost could be in a range of 0.02 to 0.06 euros per steam kilogram. Potentially 78 million vehicles could be fed with Hydrogen coming from the steam produced by the incineration of the currently nonvalorised biomass and domestic waste. Furthermore, for each energy source the optimized Hydrogen Production Cost estimation has been performed, including investment and operation Costs.
Yasunori Kikuchi - One of the best experts on this subject based on the ideXlab platform.
-
battery assisted low Cost Hydrogen Production from solar energy rational target setting for future technology systems
International Journal of Hydrogen Energy, 2019Co-Authors: Yasunori Kikuchi, Michihisa Koyama, Masakazu Sugiyama, Takayuki IchikawaAbstract:Abstract The massive implementation of renewable energy requires sophisticated assessments considering the combination of feasible technology options. In this study, a techno-economic analysis was conducted for Hydrogen Production from photovoltaic power generation (PV) utilizing a battery-assisted electrolyzer. The installed capacity of each component technology was optimized for the wide range of unit Costs of electricity from the PV, battery, and proton-exchange membrane electrolyzer. Leveling of PV output by battery, the necessary capacity of electrolyzer is suppressed and the operating ratio of electrolyzer increases. The battery-assist will result in a lower Hydrogen Production Cost when the benefit associated with the smaller capacity and higher operation ratio of the electrolyzer exceeds the necessary investment for battery installation. The results from this study indicated the Cost of Hydrogen as low as 17 to 27 JPY/Nm3 using a combination of technologies and the achievement of ambitious individual Cost targets for batteries, PV, and electrolyzers.
Avner Rothschild - One of the best experts on this subject based on the ideXlab platform.
-
Photoelectrochemical water splitting in separate oxygen and Hydrogen cells
Nature Materials, 2017Co-Authors: Avigail Landman, Hen Dotan, Gennady E. Shter, Michael Wullenkord, Anis Houaijia, Artjom Maljusch, Gideon S. Grader, Avner RothschildAbstract:Solar water splitting provides a promising path for sustainable Hydrogen Production and solar energy storage. One of the greatest challenges towards large-scale utilization of this technology is reducing the Hydrogen Production Cost. The conventional electrolyser architecture, where Hydrogen and oxygen are co-produced in the same cell, gives rise to critical challenges in photoelectrochemical water splitting cells that directly convert solar energy and water to Hydrogen. Here we overcome these challenges by separating the Hydrogen and oxygen cells. The ion exchange in our cells is mediated by auxiliary electrodes, and the cells are connected to each other only by metal wires, enabling centralized Hydrogen Production. We demonstrate Hydrogen generation in separate cells with solar-to-Hydrogen conversion efficiency of 7.5%, which can readily surpass 10% using standard commercial components. A basic Cost comparison shows that our approach is competitive with conventional photoelectrochemical systems, enabling safe and potentially affordable solar Hydrogen Production. Solar water splitting is promising for Hydrogen Production and solar energy storage, but for large-scale utilization Cost must be reduced. A membrane-free approach in separate oxygen and Hydrogen cells brings water splitting closer to applications.
-
Photoelectrochemical water splitting in separate oxygen and Hydrogen cells
Nature Materials, 2017Co-Authors: Avigail Landman, Hen Dotan, Gennady E. Shter, Michael Wullenkord, Anis Houaijia, Artjom Maljusch, Gideon S. Grader, Avner RothschildAbstract:Solar water splitting provides a promising path for sustainable Hydrogen Production and solar energy storage. One of the greatest challenges towards large-scale utilization of this technology is reducing the Hydrogen Production Cost. The conventional electrolyser architecture, where Hydrogen and oxygen are co-produced in the same cell, gives rise to critical challenges in photoelectrochemical water splitting cells that directly convert solar energy and water to Hydrogen. Here we overcome these challenges by separating the Hydrogen and oxygen cells. The ion exchange in our cells is mediated by auxiliary electrodes, and the cells are connected to each other only by metal wires, enabling centralized Hydrogen Production. We demonstrate Hydrogen generation in separate cells with solar-to-Hydrogen conversion efficiency of 7.5%, which can readily surpass 10% using standard commercial components. A basic Cost comparison shows that our approach is competitive with conventional photoelectrochemical systems, enabling safe and potentially affordable solar Hydrogen Production.
Gilles Flamant - One of the best experts on this subject based on the ideXlab platform.
-
Analysis of solar chemical processes for Hydrogen Production from water splitting thermochemical cycles
Energy Conversion and Management, 2008Co-Authors: Patrice Charvin, Stéphane Abanades, Florent Lemort, Gilles FlamantAbstract:This paper presents a process analysis of ZnO/Zn, Fe3O4/FeO and Fe2O3/Fe3O4 thermochemical cycles as potential high efficiency, large scale and environmentally attractive routes to produce Hydrogen by concentrated solar energy. Mass and energy balances allowed estimation of the efficiency of solar thermal energy to Hydrogen conversion for current process data, accounting for chemical conversion limitations. Then, the process was optimized by taking into account possible improvements in chemical conversion and heat recoveries. Coupling of the thermochemical process with a solar tower plant providing concentrated solar energy was considered to scale up the system. An economic assessment gave a Hydrogen Production Cost of 7.98$ kg 1 and 14.75$ kg 1 of H2 for, respectively a 55 MWth and 11 MWth solar tower plant operating 40 years.
