New solid-state electrochemical method of measuring dissolved hydrogen in Al melt

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• 作者：Seongwan Kim^a ; ^{shyodang@kaist.ac.kr" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Byounghyo Jung^b ; ^{jungbh@lgchem.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; C.O. Park^a ; ^{cops@kaist.ac.kr" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; R.A. Rapp^c ; ^{rrapp001@columbus.rr.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Hydrogen sensor ; Solid electrochemical sensor ; Heterojunction solid electrolyte ; Yttria stabilized zirconia ; Indium doped CaZrO3
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：239
• 期：Complete
• 页码：374-382
• 全文大小：2283 K

文摘

A novel solid state electrochemical sensor having a heterojunction structure consisting of a solid proton conductor and a solid oxygen-ion conductor has been developed to measure hydrogen dissolved in aluminum melt. The sensor measures hydrogen concentration with reference to an oxygen at a reference compartment. To fix the oxygen partial pressure, two different methods were used. Either a mixture of CuO and Cu₂O or else oxygen gas in air were employed to maintain a constant oxygen partial pressure at the reference electrode. The sensing mechanism of the heterojunction sensor is discussed and the characteristics of the sensor are reported in a hydrogen gas atmosphere at temperature ranging from 650 to 800 °C. The heterojunction hydrogen sensor was packaged and dipped into aluminum melt to measure hydrogen content during gassing and degassing processes.