A proton conductor electrolyte based on molten CsH5(PO4)2 for intermediate-temperature fuel cells

Chen, Xiaojing; Zhang, Yichong; Ribeiorinha, Paulo; Li, Haibin; Kong, Xiangyang; Boaventura, Marta

doi:10.1039/c7ra12803g

Cited by 22 publications

(15 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hybrid membranes composed of the phosphates and polymers have also been studied. The tested polymers include Nafion, [49] epoxy resin, [50] polyvinylidene fluoride (PVDF), [51] polyvinyl butyral (PVB), [52] polyvinylpyrrolidone (PVP), [53] and polybenzimidazole (PBI) [54,55] …”

Section: Resultsmentioning

confidence: 99%

Hydrogen Production by Steam Electrolysis in Solid Acid Electrolysis Cells

et al. 2020

View full text Add to dashboard Cite

Hydrogen production by steam electrolysis at intermediate temperatures has potential for both the high energy conversion efficiency and the flexible operability suitable for the utilization of renewable energy resources. Employment of proton-conducting solid acid electrolytes at around 200°C is considered promising but has rarely been investigated. Here, steam electrolysis was performed at 160-220°C using a solid acid electrolysis cell (SAEC) composed of a CsH 2 PO 4 /SiP 2 O 7 composite electrolyte and Pt/C electrodes. Hydrogen production was successfully demonstrated with Faraday efficiencies around 80 %. Key factors affecting the SAEC stability were investigated in detail for the first time. It was revealed that a certain part of the electrolyte migrated into the porous anode structure during the operation. The migrated electrolyte prevented the gas diffusion and flooded the Pt/C catalyst layer. It was also found that carbonaceous materials in the anode was oxidized, leading to the decrease in the number of electrochemically active sites. Based on the findings, Pt mesh was employed as an alternative anode. The SAEC with the Pt mesh anode showed superior stability, demonstrating the importance of the anode design. The present work provides a comprehensive view of the stability issues, which is essential for the development of durable and practical SAECs.

show abstract

Section: Resultsmentioning

confidence: 99%

Hydrogen Production by Steam Electrolysis in Solid Acid Electrolysis Cells

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The TGA curve of KH 5 (PO 4 ) 2 exhibits a relative stability in the temperature range of 100 to 150 °C. However, a gradual weight loss of 20% is observed during the stage from 150 to 800 °C, and this process may be caused by dehydration of KH 5 (PO 4 ) 2 . Daletou et al.…”

Section: Resultsmentioning

confidence: 99%

“…The mesoporous SiO 2 powder was synthesized by a sol‐gel method, as reported in our previous study . First, TEOS, deionized water, and hydrochloric acid were mixed with a molar ratio of 1 : 4 : 4×10 −3 (TEOS: H 2 O: HCl) and stirred for 30 min at room temperature to obtain a transparent solution.…”

Section: Methodsmentioning

confidence: 99%

“…The molten state endows the electrolyte with excellent gas tightness, meaning that MCFCs possess the highest open circuit voltage (OCV) among the various fuel cells . Our previous study showed that ITFCs based on CsH 5 (PO 4 ) 2 exhibited an OCV of 1.08 V , which is higher than that of conventional polymer electrolyte membrane fuel cells as typical LTFCs (0.9–1.0 V).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrolyte Membranes Based on Molten KH₅(PO₄)₂ for Intermediate Temperature Fuel Cells

Liu

Chen

et al. 2019

Fuel Cells

View full text Add to dashboard Cite

Electrolyte membranes loaded with KH 5 (PO 4 ) 2 are prepared by immersing SiO 2 /polybenzimidazole (PBI) matrices into molten KH 5 (PO 4 ) 2 . The morphologies, chemical structures, thermal properties, mechanical properties and proton conductivities of the electrolyte membranes are examined. The utilization of SiO 2 /PBI matrices ensures that the KH 5 (PO 4 ) 2 -loaded electrolyte membranes possess excellent mechanical properties. With the highest SiO 2 doping rate, the K/(3SiO 2 /7PBI) electrolyte membrane has favorable mechanical properties with a tensile strength of 55.83 MPa and an elongation of~5 5%, which satisfy the requirements for membrane electrode assemblies in intermediate temperature fuel cells. In addition, this electrolyte membrane possesses a superior conductivity of 0.139 S cm -1 at 180°C under an H 2 O/N 2 atmosphere and shows desirable conductivity stability at elevated temperatures. A fuel cell equipped with the K/(3SiO 2 /7PBI) electrolyte membrane exhibits an open-circuit voltage of 1.01 V and its peak power density reaches 36 mWcm -2 .

show abstract

“…The conductivity of polycrystals exceeds single crystals by three orders of magnitude due to the formation of a pseudo-liquid layer at the crystallite boundary with high mobility of protons [6,7]. A number of high conductive nanocomposites with dispersed silica and tin pyrophosphate have been obtained [9][10][11][12][13]. Recently CsH5(PO4)2-Cr-MIL-101 composites showed high proton conductivity 10 -2 -10 -3 S/cm at 80-140°C due to salt amorphization in pore space matrix [14].…”

Section: Introductionmentioning

confidence: 99%

High conductive hybrid polymer CsH₅(PO₄)₂-Butvar compounds

Gus'kov

Пономарева

2021

MATEC Web Conf.

View full text Add to dashboard Cite

Hybrid polymer compounds (1–х)CsH5(PO4)2-хButvar (х=0– 0.3), synthesized with different solvents (ethanol and isopropanol) were first synthesized and investigated. Fundamental possibility of creating new highly conductive thin polymer electrolytes based on CsH5(PO4)2 was shown. An optimal synthesis method was determined. The crystal structure of CsH5(PO4)2 (P21/c) remains unchanged in the polymer system. The thickness of the electrolyte is no more than 50-100 μm. Proton conductivity increases by 2 orders of magnitude and depends on the composition. The highest conductivity was 10-1 S/cm at 135 °C. Changes in conductivity are caused by dispersion of the salt, as well as by the presence of insignificant amounts of residual water under the synthesis conditions.

show abstract

A proton conductor electrolyte based on molten CsH₅(PO₄)₂ for intermediate-temperature fuel cells

Abstract: An proton conductor electrolyte membrane, in which molten CsH5(PO4)2 is held in a matrix made of PBI polymer and SiO2 powder, is prepared for intermediate-temperature fuel cells.

Cited by 22 publications

References 26 publications

Hydrogen Production by Steam Electrolysis in Solid Acid Electrolysis Cells

Hydrogen Production by Steam Electrolysis in Solid Acid Electrolysis Cells

Electrolyte Membranes Based on Molten KH₅(PO₄)₂ for Intermediate Temperature Fuel Cells

High conductive hybrid polymer CsH₅(PO₄)₂-Butvar compounds

Contact Info

Product

Resources

About

A proton conductor electrolyte based on molten CsH5(PO4)2 for intermediate-temperature fuel cells

Abstract: An proton conductor electrolyte membrane, in which molten CsH5(PO4)2 is held in a matrix made of PBI polymer and SiO2 powder, is prepared for intermediate-temperature fuel cells.

Cited by 22 publications

References 26 publications

Hydrogen Production by Steam Electrolysis in Solid Acid Electrolysis Cells

Hydrogen Production by Steam Electrolysis in Solid Acid Electrolysis Cells

Electrolyte Membranes Based on Molten KH5(PO4)2 for Intermediate Temperature Fuel Cells

High conductive hybrid polymer CsH5(PO4)2-Butvar compounds

Contact Info

Product

Resources

About

A proton conductor electrolyte based on molten CsH₅(PO₄)₂ for intermediate-temperature fuel cells

Electrolyte Membranes Based on Molten KH₅(PO₄)₂ for Intermediate Temperature Fuel Cells

High conductive hybrid polymer CsH₅(PO₄)₂-Butvar compounds