Hydrogen Production by Solar Thermochemical Water-Splitting Cycle via a Beam Down Concentrator

Boretti, Alberto; Nayfeh, Jamal; Al-Maaitah, Ayman

doi:10.3389/fenrg.2021.666191

Cited by 44 publications

(17 citation statements)

References 32 publications

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“…A schematic process diagram of the S-I cycle for hydrogen production is represented in Figure 5. The efficiency of the S-I cycle increased with increasing temperature and reached about 52 and 60% at 900 and 1000 °C, respectively [100,101]. It has been reported that the efficiency of the S-I cycle is amongst the highly efficient hydrogen production cycles [103].…”

Section: Green Hydrogen Technologiesmentioning

confidence: 97%

“…To prevent cross-contamination in each phase, excessive iodine can be introduced into the liquid-liquid separator [104]. Reaction ( 13) is a high-temperature endothermic reaction of sulfuric acid decomposition and usually takes place in bayonettype HEX/reactors at about 850-900 • C [101]. In this step, the SA concentration reached about 90 wt.% by distillation followed by decomposition of sulfuric acid in two steps; (a) decomposition of sulfuric acid to H 2 O and SO 3 ; and (2) decomposition of SO 3 to O 2 and SO 2 .…”

Section: Green Hydrogen Technologiesmentioning

confidence: 99%

“…Then, H 2 O and SO 2 are cooled down to about 120 • C and recycled into Reaction (12), and O 2 is stored in the tanks [100]. Reaction (14) involves the endothermic decomposition of hydriodic acid to gaseous iodine and hydrogen at about 400-500 • C [101,105,106]. Reaction (14) can be divided into two steps: (1) HI x is separated to HI x solution of azeotrope HI (~15.7 mol.%) and HI gas; and (2) decomposition of HI to H 2 and I 2 in a decomposition reactor [107].…”

Section: Green Hydrogen Technologiesmentioning

confidence: 99%

“…Introducing excessive iodine for improving the separation efficiency of HI from sulfuric acid may cause problems such as clogging the pipes [100]. In addition, the decompositions of hydriodic and sulfuric acid create a The efficiency of the S-I cycle increased with increasing temperature and reached about 52 and 60% at 900 and 1000 • C, respectively [100,101]. It has been reported that the efficiency of the S-I cycle is amongst the highly efficient hydrogen production cycles [103].…”

Section: Green Hydrogen Technologiesmentioning

confidence: 99%

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A Review on Recent Progress in the Integrated Green Hydrogen Production Processes

2022

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The thermochemical water-splitting method is a promising technology for efficiently converting renewable thermal energy sources into green hydrogen. This technique is primarily based on recirculating an active material, capable of experiencing multiple reduction-oxidation (redox) steps through an integrated cycle to convert water into separate streams of hydrogen and oxygen. The thermochemical cycles are divided into two main categories according to their operating temperatures, namely low-temperature cycles (<1100 °C) and high-temperature cycles (<1100 °C). The copper chlorine cycle offers relatively higher efficiency and lower costs for hydrogen production among the low-temperature processes. In contrast, the zinc oxide and ferrite cycles show great potential for developing large-scale high-temperature cycles. Although, several challenges, such as energy storage capacity, durability, cost-effectiveness, etc., should be addressed before scaling up these technologies into commercial plants for hydrogen production. This review critically examines various aspects of the most promising thermochemical water-splitting cycles, with a particular focus on their capabilities to produce green hydrogen with high performance, redox pairs stability, and the technology maturity and readiness for commercial use.

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Section: Green Hydrogen Technologiesmentioning

confidence: 97%

Section: Green Hydrogen Technologiesmentioning

confidence: 99%

Section: Green Hydrogen Technologiesmentioning

confidence: 99%

Section: Green Hydrogen Technologiesmentioning

confidence: 99%

See 2 more Smart Citations

A Review on Recent Progress in the Integrated Green Hydrogen Production Processes

2022

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“…While this case has certainly potential and it may use not only the thermal but also the photon energy of the sun, this approach is challenging and very far from the TRL of the first approach. The TRL of direct solar thermochemical conversion of CH 4 has a very low TRL, the same as the direct solar thermochemical water splitting of the H 2 O, [11,12] or the CO 2 molecule. Direct methods are not covered here.…”

Section: Introductionmentioning

confidence: 98%

Advances in Hydrogen Production from Natural Gas Reforming

Boretti

Banik

2021

Adv Energy and Sustain Res

Self Cite

122

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Steam natural gas reforming is the preferred technique presently used to produce hydrogen. Proposed in 1932, the technique is very well established but still subjected to perfections. Herein, first, the improvements being sought in catalysts and processes are reviewed, and then the advantage of replacing the energy supply from burning fuels with concentrated solar energy is discussed. It is especially this advance that may drastically reduce the economic and environmental cost of hydrogen production. Steam reforming can be easily integrated into concentrated solar with thermal storage for continuous hydrogen production.

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Enhanced electrocatalysis of WSe ₂ nanosheets by partial oxidation for hydrogen generation

Pataniya

Yang

et al. 2022

Intl J of Energy Research

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Pristine WSe 2 based electrocatalyst shows poor reaction kinetics in electrochemical hydrogen evolution reaction due to a lack of active atomic sites and an inert basal plane. Herein, we report an active system of non-metallic plasmonic WSe 2 /WO 3Àx , supported by highly conductive and eco-friendly Ag/cellulose paper electrodes. An air thermal annealing technique is used to enrich the p-WO 3Àx dopants in WSe 2 , which is significant for substantially improving electrocatalytic behaviour as well as photo responsive performance in the near-infrared (NIR) region. The WSe 2 /WO 3Àx dramatically decreases the overpotential of HER from À330 to À150 mV (at 10 mA/cm 2 ) owing to homo doping and generation of Se-vacancies. Surface plasmons resonances of p-WO 3Àx give the contributions to injection of photogenerated electrons and overpotential as low as À120 mV can be achieved under the illumination of NIR light. These results represent significant advances in light-enhanced electrocatalysis and would provide potential applications for commercial hydrogen generation.Novelty Statement: Novel WSe 2 /WO 3ÀX hybrid nanosheets-based electrocatalysts exhibit the light-enhanced hydrogen evolution reaction. WO 3ÀX enriched WSe 2 nanosheets exhibit rapid electrochemical charge transport due to p-homodoping and Se-vacancies. Overall, the 3D-porous structure of cellulose paper and 2D-WSe 2 /WO 3ÀX leads the promising optimisation.

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Hydrogen Production by Solar Thermochemical Water-Splitting Cycle via a Beam Down Concentrator

Cited by 44 publications

References 32 publications

A Review on Recent Progress in the Integrated Green Hydrogen Production Processes

A Review on Recent Progress in the Integrated Green Hydrogen Production Processes

Advances in Hydrogen Production from Natural Gas Reforming

Enhanced electrocatalysis of WSe ₂ nanosheets by partial oxidation for hydrogen generation

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Hydrogen Production by Solar Thermochemical Water-Splitting Cycle via a Beam Down Concentrator

Cited by 44 publications

References 32 publications

A Review on Recent Progress in the Integrated Green Hydrogen Production Processes

A Review on Recent Progress in the Integrated Green Hydrogen Production Processes

Advances in Hydrogen Production from Natural Gas Reforming

Enhanced electrocatalysis of WSe 2 nanosheets by partial oxidation for hydrogen generation

Contact Info

Product

Resources

About

Enhanced electrocatalysis of WSe ₂ nanosheets by partial oxidation for hydrogen generation