In-situ and ex-situ comparison of the electrochemical oxidation of SO2 on carbon supported Pt and Au catalysts

Meekins, Benjamin H.; Thompson, A. B.; Gopal, V.; Mehrabadi, Bahareh Alsadat Tavakoli; Elvington, Mark C.; Ganesan, P.; Newhouse-Illige, Ty; Shepard, Adam; Scipioni, Lawrence E.; Greer, James A.; Weiss, J.; Weidner, John W.; Colón-Mercado, Héctor

doi:10.1016/j.ijhydene.2019.11.112

Cited by 15 publications

(12 citation statements)

References 23 publications

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“…It is known that the product acid concentration has an important effect on the electrochemical performance of SDE production of sulfuric acid and hydrogen. 8 While Pt kinetics are generally not influenced by the acid concentration, 6 the ohmic overpotential increases due to the loss of hydration in the membrane. 5 However, one important effect of acid accumulation at the catalyst layer is its influence on the thermodynamic potential of the SDE reaction.…”

Section: Resultsmentioning

confidence: 99%

“…The current work focuses on improvements in the SDE process, as it is one of the major operations that impact the overall HyS cycle efficiency. Literaturereported results to date are far from the performance goals [4][5][6] (600 mV at 500 mA/cm 2 and 65 wt% sulfuric acid) set by technoeconomic analysis to meet the cost target. 7 From the literature, it is apparent that to meet the current, potential, and acid concentration goals simultaneously, operation must take place at high pressures and temperatures.…”

Section: Introductionmentioning

confidence: 92%

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Electrode optimization for efficient hydrogen production using an SO2-depolarized electrolysis cell

Colón-Mercado

Mauger

Gorensek

et al. 2022

International Journal of Hydrogen Energy

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Electrode optimization for efficient hydrogen production using an SO2-depolarized electrolysis cell

Colón-Mercado

Mauger

Gorensek

et al. 2022

International Journal of Hydrogen Energy

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“…Due to the pressure gradient and water activity difference, water diffuses through the membrane to the anode side and is then re-transported to the cathode side due to electro-osmotic drag [135]. The standard cell potential for the electrochemical step is about −0.158 V at room temperature, which is about 13% of the water electrolysis potential (~−1.229 V) [137,140].…”

Section: Hybrid Sulfur Cyclementioning

confidence: 99%

“…[141]. An issue associated with this step is the kinetic overpotential of sulfur dioxide oxidation reaction, which has been addressed by using Pt as the baseline catalytic formulation [142] or Au nanoparticle catalysts with higher current density and stability than the Pt ones [140]. Kim et al [143] prepared Fe/Al and Fe/Ti binary metal oxide catalysts via the co-precipitation method and reported that increasing Fe content improved the catalytic activity.…”

Section: Hybrid Sulfur Cyclementioning

confidence: 99%

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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“…Meekins et al 24 investigated the performance of thin films of commercial carbon-supported platinum and gold catalysts for SDE in ex situ (rotating disk electrode RDE) and in situ (single fuel cell) systems. It was demonstrated that Au can be used as a substitute catalyst for Pt for SO 2 electrooxidation.…”

Section: Introductionmentioning

confidence: 99%

Electrospray Deposition of Catalyst Layers with Ultralow Pt Loading for Cost-Effective H₂ Production by SO₂ Electrolysis

Fouzaï

Radaoui

Díaz-Abad

et al. 2022

ACS Appl. Energy Mater.

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The hybrid sulfur (HyS) thermochemical cycle has been considered as a promising approach for the massive production of clean hydrogen without CO 2 emissions. The key to advance this technology and to enhance the cycle efficiency is to improve the electrocatalytic oxidation of SO 2 , which is the pivotal reaction within this process. Hence, this paper investigates, for the first time, the effect of electrospray and air gun deposition techniques and the influence of very low Pt loadings (<0.3 mg Pt/cm 2 ) on catalyst durability and activity. The variation of electrochemical active surface area (ECSA) with the number of cycles demonstrates the significant impact of the electrode fabrication method and catalyst loading on the catalyst durability with considerable ECSA values for electrosprayed electrodes. Electrodes prepared with low platinum loadings (0.05 mg Pt/cm 2 ) exhibit elevated catalyst activity and stability under sulfuric acid conditions and maintain a crucial current density after 5 h of electrolysis. This work extends the understanding of the SO 2 -depolarized electrolysis (SDE) process and gives suggestions for further improvements in the catalyst layer fabrication, which provides potential support for the large-scale research and application of the HyS cycle.

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In-situ and ex-situ comparison of the electrochemical oxidation of SO2 on carbon supported Pt and Au catalysts

Cited by 15 publications

References 23 publications

Electrode optimization for efficient hydrogen production using an SO2-depolarized electrolysis cell

Electrode optimization for efficient hydrogen production using an SO2-depolarized electrolysis cell

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

Electrospray Deposition of Catalyst Layers with Ultralow Pt Loading for Cost-Effective H₂ Production by SO₂ Electrolysis

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In-situ and ex-situ comparison of the electrochemical oxidation of SO2 on carbon supported Pt and Au catalysts

Cited by 15 publications

References 23 publications

Electrode optimization for efficient hydrogen production using an SO2-depolarized electrolysis cell

Electrode optimization for efficient hydrogen production using an SO2-depolarized electrolysis cell

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

Electrospray Deposition of Catalyst Layers with Ultralow Pt Loading for Cost-Effective H2 Production by SO2 Electrolysis

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Product

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Electrospray Deposition of Catalyst Layers with Ultralow Pt Loading for Cost-Effective H₂ Production by SO₂ Electrolysis