Investigations of the Effect of Polymer Electrode in Hydrogenation Reactions

Abstract

Although conductive polymers have been widely used in recent electrochemical hydrogenation studies, it has not been fully clarified how they contribute to the reaction. Herein, polyaniline, which has high conductivity and stability, was turned into an electrode without metal support and its hydrogen generation performance was examined. The hydrogen evolution mechanism was investigated by cyclic voltammetry, Tafel polarization curve, and electrochemical impedance spectroscopy. Through the analysis results, it was determined that hydrogen formation occurred slowly and in a controllable. Hydrogen evalution kinetics were tried to be elucidated simulation of Nyquist curves recorded at different potentials performed by electrochemical impedance spectroscopy and It has been understood that the transformation of stable molecules such as CO2 and N2 with lower energy input is due to the slow hydrogen release feature of the polymer. The prepared electrode was characterized by SEM and BET analysis

Keywords

• hydrogen evolution
• metal free electrod
• polayniline
• Electrochemical impedance spectroscopy
• Tafel polarization curve

Hidrojenasyon Reaksiyonlarında Polimer Elektrodun Etkisinin İncelenmesi

Öz

Son yapılan elektrokimyasal hidrojenasyon çalışmalarında iletken polimerler yaygın olarak kullanılsa da reaksiyona nasıl bir katkıda bulundukları tam olarak aydınlatılmamıştır. Bu çalışmada iletkenliği ve kararlılığı yüksek olan polianilin metal desteksiz olarak elektrot haline getirilip, hidrojen oluşturma performansı incelenmiştir. Hidrojen oluşum mekanizması dönüşümlü voltametri, Tafel polarizasyon eğrisi ve elektrokimyasal impedans spektroskopisi ile incelenmiştir. Elde edilen veriler doğrultusunda hidrojen oluşumunun yavaş ve kontrollü gerçekleştiği elde edilen Tafel eğimi değerinden (480 mV/dec) anlaşılmıştır. Hidrojen oluşum kinetiği elektrokimyasal impedans spektroskopisi ile farklı potansiyellerde kaydedilen Nyquist eğrilerinin simülasyonu sonucu aydınlatılmaya çalışılmıştır. CO2, N2 gibi kararlı moleküllerin daha düşük enerji girdisi ile dönüşümlerinin gerçekleşmesinin polimerin yavaş hidrojen çıkarması özelliğinden kaynaklandığı anlaşılmıştır. Hazırlanan elektrodun SEM ve BET analizi ile karakterizasyonu gerçekleştirilmiştir.

Anahtar Kelimeler

• hidrojen oluşumu
• metal desteksiz elektrot
• polianilin
• Elektrokimyasal impedans spektroskopisi
• Tafel polarizasyon eğrisi

Kaynakça

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