Enhanced solar hydrogen generation with the direct coupling of photo and thermal energy – An experimental and mechanism study

Lu, Buchu; Yan, Xiangyu; Liu, Qibin

doi:10.1016/j.apenergy.2022.120468

Cited by 10 publications

(3 citation statements)

References 40 publications

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“…[270] Meanwhile, Lu and coworkers reported that, for methanol steam reforming using Cu/ZnO/Al 2 O 3 catalyst, the synergistic effect of light and heat from solar energy enabled decreasing the reaction temperature by more than 10 °C at 188 °C compared with the thermochemical reaction, accompanied by an increased hydrogen production of 32.9%. [271] Mechanism investigations demonstrated that hot electrons induced by sunlight irradiation on Cu and ZnO facilitated the generation of the critical intermediates of hydroxyl groups during the thermal catalytic process, thus greatly improving the catalytic activity.…”

Section: Methanol For Solar-driven H 2 Generationmentioning

confidence: 99%

Solar‐Driven Biomass Reforming for Hydrogen Generation: Principles, Advances, and Challenges

Pan,

Li,

Wang

et al. 2024

Advanced Science

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Hydrogen (H2) has emerged as a clean and versatile energy carrier to power a carbon‐neutral economy for the post‐fossil era. Hydrogen generation from low‐cost and renewable biomass by virtually inexhaustible solar energy presents an innovative strategy to process organic solid waste, combat the energy crisis, and achieve carbon neutrality. Herein, the progress and breakthroughs in solar‐powered H2 production from biomass are reviewed. The basic principles of solar‐driven H2 generation from biomass are first introduced for a better understanding of the reaction mechanism. Next, the merits and shortcomings of various semiconductors and cocatalysts are summarized, and the strategies for addressing the related issues are also elaborated. Then, various bio‐based feedstocks for solar‐driven H2 production are reviewed with an emphasis on the effect of photocatalysts and catalytic systems on performance. Of note, the concurrent generation of value‐added chemicals from biomass reforming is emphasized as well. Meanwhile, the emerging photo‐thermal coupling strategy that shows a grand prospect for maximally utilizing the entire solar energy spectrum is also discussed. Further, the direct utilization of hydrogen from biomass as a green reductant for producing value‐added chemicals via organic reactions is also highlighted. Finally, the challenges and perspectives of photoreforming biomass toward hydrogen are envisioned.

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Section: Methanol For Solar-driven H 2 Generationmentioning

confidence: 99%

Solar‐Driven Biomass Reforming for Hydrogen Generation: Principles, Advances, and Challenges

Pan,

Li,

Wang

et al. 2024

Advanced Science

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“…10 The utilization of solar photo energy to initiate chemical reactions has garnered significant attention. 12,13 The process relies on specific shortwavelength solar spectra that can induce the photoelectric effect on the catalyst surface, which is largely related to the characteristics of the catalyst. 14 Until now, the theoretical boundaries of the solar spectrum required for the water-to-hydrogen conversion remain confused, and require a thermodynamic method.…”

Section: Introductionmentioning

confidence: 99%

Insights of water-to-hydrogen conversion from thermodynamics

Jiao,

Chen,

Liu

et al. 2024

The Innovation Energy

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<p>Water-to-hydrogen can be achieved using a variety of driving energy sources, including thermal, electrical, or photo energy. While methods for hydrogen production in specific energy driving scenarios have been extensively studied, a comprehensive theory to explain the conversion of various energies into hydrogen is still lacking. This study provides a novel exergy-based perspective on hydrogen production methods, revealing that the thermodynamic infeasible water splitting process is derived from insufficient exergy input relative to the reaction exergy requirement. Enhancing the exergy input beyond the reaction exergy requirement can break through chemical equilibrium and enable the reaction to proceed. Providing high exergy-to-energy ratios of energy sources such as electrical, photo, and chemical energy for thermochemical water splitting reactions can reduce the thermal exergy demand for hydrogen production, thus facilitating water-to-hydrogen conversion at lower temperatures. By applying this new insight to coupled photochemical- and thermochemical water splitting reactions, equilibrium conversion rates corresponding to solar spectra with different wavelengths are obtained. The highest water-to-hydrogen conversion rate is achieved by the solar spectrum at a wavelength of about 451nm. The appropriate wavelength region for high water-to-hydrogen conversion is identified. This study also identifies the theoretical conversion limit of photochemical water splitting, providing insights into the potential improvements of current experiments. More importantly, our work offers a unified thermodynamic framework for understanding hydrogen production methods and presents a theoretical basis for reducing reaction temperature and enhancing conversion rate.</p>

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“…The basic principle of solar thermochemical hydrogen production is to convert solar energy into heat through a collector, then use the solar thermal energy to drive chemical reactions that produce hydrogen. The thermochemical process can utilize the full spectrum solar energy, but suffering exergy loss in the conversion process from light to heat before used by a subsequent endothermic reaction [3]. Moreover, it often operates at relatively high temperature to achieve desired H2 yield.…”

Section: Introductionmentioning

confidence: 99%

Experiment Study of Solar Hydrogen Production by Photo-thermal Driven Steam Methane Reforming with Co/Al2O3 Catalyst

Juan¹,

Fang²,

Dong³

et al. 2023

Preprint

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Solar-driven steam methane reforming (SMR) is a promising technology for hydrogen production. However, current solar thermochemical and photochemical reactions have different limitations. The former often requires high temperatures to achieve desired yield and neglects the strong activation ability of photons in short-wavelength spectrum, while the latter cannot use solar energy in the long-wavelength spectrum due to catalyst drawbacks, resulting in low solar energy utilization efficiency. To overcome these drawbacks, photo-thermal synergetic catalytic hydrogen production is proposed to achieve higher solar-tohydrogen efficiency under relatively mild condition. In this work, the photo-thermal synergetic effect of solar hydrogen production from SMR using Co/Al2O3 catalyst is experimentally investigated. Results show the H2 yield by photo-thermochemical reaction (221.7 mmol•h -1 •g -1 ) can be increased by 42.8% at 650°C compared with that of the thermochemical reaction (155.2 mmol•h -1 •g -1 ), and the activation energy of the photo-thermochemical reaction is significantly reduced. The high activity is mainly attributed to photoactivation effect of light in photo-thermochemistry. These findings provide valuable guidance for hydrogen production from steam methane reforming using solar energy.

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Enhanced solar hydrogen generation with the direct coupling of photo and thermal energy – An experimental and mechanism study

Cited by 10 publications

References 40 publications

Solar‐Driven Biomass Reforming for Hydrogen Generation: Principles, Advances, and Challenges

Solar‐Driven Biomass Reforming for Hydrogen Generation: Principles, Advances, and Challenges

Insights of water-to-hydrogen conversion from thermodynamics

Experiment Study of Solar Hydrogen Production by Photo-thermal Driven Steam Methane Reforming with Co/Al2O3 Catalyst

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