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Various operating methods and parameters for SO2 electrolysis

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The application of PFSA-based proton exchange membranes was investigated for the production of hydrogen and sulfuric acid using a SO2-depolarized electrolyzer system. Parameters investigated included hot pressing pressure for the
membrane electrode assembly (MEA) manufacturing, cell temperature, membrane thickness, catalyst loading, membrane type, and SO2 anode feed concentration.The effect of cell temperature, membrane thickness, and acid concentrations
was also investigated when using a second method, where clean sulfuric acid as cathode and SO2 saturated sulfuric acid as anode were used. Electrochemical impedance spectroscopy showed that the pressure exerted in the MEA manufacturing
step had a significant influence with 125 kg cm−2 yielding the highest current density. High temperatures (>80°C) and thin membranes (≈120 μm)showed the best performance while thicker membranes produced higher acid concentration when using the first system. The SO2 concentration in the anode had a significant influence with the over potential increasing with decreasing SO2 concentration. When using the second method, it was found that the SO2
solubility in sulfuric acid is important as the mass transport of the SO2 limits the overall reaction rate. From the two systems tested, the first method, that is, dry SO2 anode and liquid water cathode showed the best operational effectiveness reaching a maximum of 0.32 A cm−2 at 80°C using N115 coated with 1 mgPt cm−2 while the second system under the same conditions achieved a current density of 0.18 A cm−2 when using N117.

Keywords
Electrochemical impedance spectroscopy,hydrogen, proton exchange membrane, SO2 electrolyzer, thermochemical

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Informasi Detail

Judul Seri

Energy Science and Engineering

No. Panggil

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Penerbit

: The Authors., 2015

Deskripsi Fisik

Energy Science and Engineering 2015; 3(5):468–480

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

FISIKA

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

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