Proposal and evaluation of a hydrogen and electricity cogeneration system based on thermochemical complementary utilization of coal and solar energy

Xue, Xiaodong; Han, Wei; Liu, Changchun; Li, Jichao; Jin, Hongguang; Wang, Xiaodong

doi:10.1016/j.enconman.2023.117266

Cited by 14 publications

(2 citation statements)

References 25 publications

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“…For example, the reaction enthalpy of thermolysis of ZnO is larger than that of pyrolyzing H 2 O, but the temperature of ZnO decomposition reaction is lower than that of thermochemical water splitting. 24 A water splitting reaction involves the transformations of energy and exergy, given that the resulting H 2 carries chemical energy and chemical exergy. 25,26 For a successful water splitting process geared towards H 2 production, the supplied energy and its corresponding exergy must match the chemical energy and exergy inherent in the H 2 .…”

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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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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“…The depletion of non-renewable energy resources and their consequential environmental impacts necessitate the urgent exploration of alternative clean energy sources [1,2]. Hydrogen attracts much attention and is believed to be the ideal candidate due to its high energy density and lack of emission of greenhouse gases after its consumption [3,4]. Electrocatalytic water splitting, a highly promising method for hydrogen production, harnesses surplus electricity and water to yield exceptionally pure hydrogen [5].…”

Section: Introductionmentioning

confidence: 99%

Sulfur-Doped Nickel–Iron LDH@Cu Core–Shell Nanoarrays on Copper Mesh as High-Performance Electrocatalysts for Oxygen Evolution Reaction

Zhang,

Guo,

Sun

et al. 2023

J. Compos. Sci.

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The oxygen evolution reaction (OER) is a slow step in electrocatalytic water splitting. NiFe layered double hydroxides (LDH) have shown promise as affordable OER electrocatalysts, but their performance is hindered by poor charge transfer and sluggish kinetics. To address this, we doped NiFe LDH with sulfur (S) using an in situ electrodeposition method. By growing S-doped NiFe LDH on Cu nanoarrays, we created core–shell structures that improved both the thermodynamics and kinetics of OER. The resulting S-NiFe LDH@Cu core–shell nanoarrays exhibited enhanced activity in water oxidation, with a low potential of 236 mV (at 50 mA cm−2) and a small Tafel slope of 50.64 mV dec−1. Moreover, our alkaline electrolyzer, based on these materials, demonstrated remarkable activity, with a low voltage of 1.56 V at 100 mA cm−2 and excellent durability. The core–shell nanoarray structures provided a larger electroactive surface area, facilitated fast electron transport, and allowed for effective gas release. These findings highlight the potential of S-NiFe LDH@Cu core–shell nanoarrays as efficient OER electrocatalysts.

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