Pt-based bimetallic catalysts for SO2-depolarized electrolysis reaction in the hybrid sulfur process

Xue, Lulu; Zhang, Ping; Chen, Songzhe; Wang, Laijun

doi:10.1016/j.ijhydene.2014.02.128

Cited by 28 publications

(22 citation statements)

References 19 publications

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“…The first design of the SO 2 electrolyzer was developed by Westinghouse Corp. in the 1970s, and it consisted of a conventional electrolysis cell with two compartments separated by a membrane [17]. Modern electrolyzers for this process are based on proton exchange membrane fuel cell (PEMFC) technology, where the membrane-electrode-assembly (MEA) is the core of the cell [18]. Figure 3 shows a scheme of a PEM electrolyzer for SO 2 depolarized electrolysis.…”

Section: So2(aq) + 2h2o → H2so4(aq) + 2h + + 2e −mentioning

confidence: 99%

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Review of Anodic Catalysts for SO2 Depolarized Electrolysis for “Green Hydrogen” Production

et al. 2019

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In the near future, primary energy from fossil fuels should be gradually replaced with renewable and clean energy sources. To succeed in this goal, hydrogen has proven to be a very suitable energy carrier, because it can be easily produced by water electrolysis using renewable energy sources. After storage, it can be fed to a fuel cell, again producing electricity. There are many ways to improve the efficiency of this process, some of them based on the combination of the electrolytic process with other non-electrochemical processes. One of the most promising is the thermochemical hybrid sulphur cycle (also known as Westinghouse cycle). This cycle combines a thermochemical step (H2SO4 decomposition) with an electrochemical one, where the hydrogen is produced from the oxidation of SO2 and H2O (SO2 depolarization electrolysis, carried out at a considerably lower cell voltage compared to conventional electrolysis). This review summarizes the different catalysts that have been tested for the oxidation of SO2 in the anode of the electrolysis cell. Their advantages and disadvantages, the effect of platinum (Pt) loading, and new tendencies in their use are presented. This is expected to shed light on future development of new catalysts for this interesting process.

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Section: So2(aq) + 2h2o → H2so4(aq) + 2h + + 2e −mentioning

confidence: 99%

“…Xue et al [18] studied the electrochemical catalytic activity of different bi-metallic materials based on platinum. Vulcan XC-72R was the support for all catalysts.…”

Section: Combination Of Platinum With Other Metalsmentioning

confidence: 99%

Review of Anodic Catalysts for SO2 Depolarized Electrolysis for “Green Hydrogen” Production

et al. 2019

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“…32,[40][41][42][43] The process aims at decreasing the potentials required to achieve water reduction to hydrogen by replacing the conventional oxygen evolution reaction at the positive electrode with the less energetically demanding oxidation of SO 2 . As SO 2 oxidation occurs at much lower potentials than oxygen evolution, significantly lower cell voltages are required for hydrogen evolution.…”

Section: Discharge Of the Positive Electrolyte With A Sacrificial Elementioning

confidence: 99%

All-vanadium dual circuit redox flow battery for renewable hydrogen generation and desulfurisation

et al. 2016

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“…They found that the oxidation is an oscillating reaction, that dithionate may be an intermediate, and that there is evidence for the formation of sulfur rich solids. Xue et al [26] tested a range of bimetallic catalysts for SO 2 oxidation. Their goal was to find a cheaper substitute for the baseline catalyst, platinum.…”

Section: Previous Workmentioning

confidence: 99%

Development and testing of a PEM SO2-depolarized electrolyzer and an operating method that prevents sulfur accumulation

Steimke

Steeper

Colón-Mercado

et al. 2015

International Journal of Hydrogen Energy

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The hybrid sulfur (HyS) cycle is being developed as a technology to generate hydrogen by splitting water, using heat and electrical power from a nuclear or solar power plant. A key component is the SO 2-depolarized electrolysis (SDE) cell, which reacts SO 2 and water to form hydrogen and sulfuric acid. SDE could also be used in once-through operation to consume SO 2 and generate hydrogen and sulfuric acid for sale. A proton exchange membrane (PEM) SDE cell based on a PEM fuel cell design was fabricated and tested. Measured cell potential as a function of anolyte pressure and flow rate, sulfuric acid concentration, and cell temperature are presented for this cell. Sulfur accumulation was observed inside the cell, which could have been a serious impediment to further development. A method to prevent sulfur formation was subsequently developed. This was made possible by a testing facility that allowed unattended operation for extended periods.

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Pt-based bimetallic catalysts for SO2-depolarized electrolysis reaction in the hybrid sulfur process

Cited by 28 publications

References 19 publications

Review of Anodic Catalysts for SO2 Depolarized Electrolysis for “Green Hydrogen” Production

Review of Anodic Catalysts for SO2 Depolarized Electrolysis for “Green Hydrogen” Production

All-vanadium dual circuit redox flow battery for renewable hydrogen generation and desulfurisation

Development and testing of a PEM SO2-depolarized electrolyzer and an operating method that prevents sulfur accumulation

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