Origin of Steam Contaminants and Degradation of Solid-Oxide Electrolysis Stacks Article Swipe

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Dominik Schäfer , Larissa Queda , Volker Nischwitz , Qingping Fang , L. Blum ·

YOU? · · 2022 · Open Access · · DOI: https://doi.org/10.20944/preprints202203.0077.v1

Two once-through steam generators and a combination of a steam generator and a gas preheater for supplying feed gases to solid-oxide electrolysis stacks were evaluated for their carryover characteristics of contaminants from the feed-water into the steam phase. The concentrations of various trace impurities in the steam were determined by sampling the steam condensates and screening them with inductively coupled plasma - mass spectrometry for 19 elements and liquid ion chromatography and continuous flow analysis for chloride and ammonium. Steam soluble species like boric acid undergo complete volatilization and transfer into the steam phase. During unstable evaporation in the steam generators an extensive physical carryover of alloying metal species was observed. At realistic operation conditions for steam electrolysis, the gas preheater caused a considerable release of silicon into the steam phase. Two stack experiments were performed with common preheater temperatures and showed largely increased cell voltage degradation at higher operation temperatures. The post-test chemical analysis of cell samples revealed significant concentrations of silicon in the samples that are regarded as primary cause for increased degradation. These findings could partially explain the wide spread of degradation rates reported for solid-oxide steam electrolysis experiments.

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Air preheater Electrolysis High-temperature electrolysis Chemistry Volatilisation Waste management Electrolyte Electrode Organic chemistry Physical chemistry Engineering

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Type: preprint
Language: en
Landing Page: https://doi.org/10.20944/preprints202203.0077.v1
PDF: https://www.preprints.org/manuscript/202203.0077/v1/download
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Cited By: 2
References: 33
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DOI: https://doi.org/10.20944/preprints202203.0077.v1

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Title: Origin of Steam Contaminants and Degradation of Solid-Oxide Electrolysis Stacks

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Type: preprint

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Language: en

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Publication year: 2022

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Publication date: 2022-03-04

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Authors: Dominik Schäfer, Larissa Queda, Volker Nischwitz, Qingping Fang, L. Blum

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Landing page: https://doi.org/10.20944/preprints202203.0077.v1

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Concepts: Air preheater, Electrolysis, High-temperature electrolysis, Chemistry, Volatilisation, Waste management, Electrolyte, Electrode, Organic chemistry, Physical chemistry, Engineering

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Cited by: 2

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