Decomposition of hydriodic acid by electrolysis in the thermochemical water sulfur–iodine splitting cycle

Xu, Shaojie; He, Yong; Huang, Biyi; Zhang, Yanwei; Wang, Zhihua; Cen, Kefa

doi:10.1016/j.ijhydene.2017.12.177

Cited by 20 publications

(8 citation statements)

References 17 publications

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“…The simulated hydrogen volume vs time is also presented in Figure 5, the slop of which was larger than that of the experimental curve, the reason could be that the permeated iodine from anode to cathode inhibited the conversion of hydrogen ions to hydrogen, and thereby reduced the hydrogen production. 41 The low relative deviation of 0.04 to 0.17 indicated the reasonable agreement between the experimental data and the simulation results, verifying the practicability of the developed models.…”

Section: Hydrogen Production and Model Validationsupporting

confidence: 62%

“…Increase in temperature improved the hydrogen ions permeation flux according to Equations , and thereby amplified the H 2 production. However, more iodine was found permeating through PEM from anolyte to catholyte at higher temperatures according to experiments . Meanwhile, a lower operating temperature within 353 K is favorable for Nafion PEM.…”

Section: Resultsmentioning

confidence: 94%

“…In reference to the hydrogen volume calculation method proposed by Xu et al, 41 the hydrogen production volume in the experiments was calculated through integrating the hydrogen volume flow rate measured by hydrogen analyzer against time. The experimental hydrogen production volume almost increased linearly with time, as shown in Figure 5, indicating the continuous electrochemical reactions at electrodes.…”

Section: Hydrogen Production and Model Validationmentioning

confidence: 99%

“…However, more iodine was found permeating through PEM from anolyte to catholyte at higher temperatures according to experiments. 41 Meanwhile, a lower operating temperature within 353 K is favorable for Nafion PEM. As a result, the operating temperature for HI-I 2 -H 2 O electrolysis should be controlled properly.…”

Section: Effects Of Temperature On Electrolytic Process Characteristicsmentioning

confidence: 99%

“…To overcome the complexity of HIx section, Xu et al from Zhejiang University recently proposed the decomposition of HIx solution from Bunsen reaction to H 2 by direct electrolysis, instead of the above concentration, distillation and catalytic decomposition. Only an electrolytic cell (EC) was applied for HI oxidization to I 2 at anode and hydrogen ions reduction to H 2 at cathode, with the separation by a proton exchange membrane (PEM), which also transferred the hydrogen ions from anode to cathode.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Modeling and experimental assessment of the novel HI‐I ₂ ‐H ₂ O electrolysis for hydrogen generation in the sulfur‐iodine cycle

et al. 2020

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Summary To improve the sulfur‐iodine (SI or IS) cycle for renewable hydrogen production, direct electrolysis of HIx solution (HI‐I2‐H2O) from Bunsen reaction has been recently proposed. This work concerns the detailed microscopic physical performance and electrolytic processes of HIx electrolysis through theoretical simulation and experimental exploration. A two‐dimensional mathematical model of the electrolytic cell for HIx electrolysis was developed, and was verified by the relevance between the simulated and experimental hydrogen production. The concentration, electric and flow field distributions were characterized. The decrease of anodic HI and increase of cathodic H2 were found along the flow direction. The local potential distribution declined from anode to cathode region. Higher pressure drop from the inlet to outlet of channel as well as the pumping power were required for anolyte than catholyte. More detailed electrolytic processes along the flow channel at different operating conditions were analyzed. Increasing temperature from 303 K to 343 K improved the H2 production rate. A low anode flow rate of 0.2 m/s was favorable for achieving high conversion rate of reactants and low consumed pumping power. The developed models and the clarified characteristics of HIx electrolysis will be further applied to the improved SI cycle.

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Section: Hydrogen Production and Model Validationsupporting

confidence: 62%

Section: Resultsmentioning

confidence: 94%

Section: Hydrogen Production and Model Validationmentioning

confidence: 99%

Section: Effects Of Temperature On Electrolytic Process Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modeling and experimental assessment of the novel HI‐I ₂ ‐H ₂ O electrolysis for hydrogen generation in the sulfur‐iodine cycle

et al. 2020

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Symmetric aqueous redox flow battery using hydroiodic acid and anthraquinone‐2, 7‐disulfonic acid as redox couple

Permatasari

Lee

Kwon

2022

Intl J of Energy Research

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Summary Iodide and triiodide ions (I− and I3− ions) are interesting active redox materials for aqueous redox flow batteries (ARFBs) due to high solubility in various supporting electrolytes. However, under alkaline and neutral electrolytes, the redox reaction of I− and I3− ions is unstable due to undesirable potassium iodate produced during the reaction, whereas the reaction is stably operated under an acidic electrolyte state. As a redox couple, anthraquinone‐2,7‐disulfonic acid (AQDS) is considered due to excellent stability and high solubility, and perchloric acid is determined as an electrolyte because this suppresses another undesirable water‐splitting reaction. For providing abundant I− and I3− ions, hydroiodic acid (HI) is used because hydrogen ions contained in HI can act as a proton donor, increasing the conductivity in the solution leading to better kinetics of the redox reaction of I− and I3−. When asymmetric ARFB using this redox couple is operated, gradual decay in both capacity and efficiencies is observed. This is due to the crossover of I− ions to the AQDS side. To overcome the problem, symmetric ARFB using the mixture of HI and AQDS in both electrolytes is adopted, and with that, the crossover issue is solved because the ionic balance of electrolyte is well maintained by the use of symmetric electrolyte, while its energy efficiency and discharging capacity are excellent as 67.6% and 26.6 Ah L−1, respectively, with capacity retention of 99.99% for 100 cycles.

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Decoupling the anodic and cathodic behavior in asymmetric electrochemical hydroiodic acid decomposition cell for hydrogen production in the iodine–sulfur thermochemical cycle

Hegde,

Chaudhary,

Damaraju

et al. 2023

Environ Sci Pollut Res

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Decomposition of hydriodic acid by electrolysis in the thermochemical water sulfur–iodine splitting cycle

Cited by 20 publications

References 17 publications

Modeling and experimental assessment of the novel HI‐I ₂ ‐H ₂ O electrolysis for hydrogen generation in the sulfur‐iodine cycle

Modeling and experimental assessment of the novel HI‐I ₂ ‐H ₂ O electrolysis for hydrogen generation in the sulfur‐iodine cycle

Symmetric aqueous redox flow battery using hydroiodic acid and anthraquinone‐2, 7‐disulfonic acid as redox couple

Decoupling the anodic and cathodic behavior in asymmetric electrochemical hydroiodic acid decomposition cell for hydrogen production in the iodine–sulfur thermochemical cycle

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Decomposition of hydriodic acid by electrolysis in the thermochemical water sulfur–iodine splitting cycle

Cited by 20 publications

References 17 publications

Modeling and experimental assessment of the novel HI‐I 2 ‐H 2 O electrolysis for hydrogen generation in the sulfur‐iodine cycle

Modeling and experimental assessment of the novel HI‐I 2 ‐H 2 O electrolysis for hydrogen generation in the sulfur‐iodine cycle

Symmetric aqueous redox flow battery using hydroiodic acid and anthraquinone‐2, 7‐disulfonic acid as redox couple

Decoupling the anodic and cathodic behavior in asymmetric electrochemical hydroiodic acid decomposition cell for hydrogen production in the iodine–sulfur thermochemical cycle

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Modeling and experimental assessment of the novel HI‐I ₂ ‐H ₂ O electrolysis for hydrogen generation in the sulfur‐iodine cycle

Modeling and experimental assessment of the novel HI‐I ₂ ‐H ₂ O electrolysis for hydrogen generation in the sulfur‐iodine cycle