Investigation of the performance of high‐temperature electrochemical hydrogen purification from reformate gases

Abstract

Summary In the present work, the purification of hydrogen from a hydrogen/carbon dioxide/carbon monoxide (H2:CO2:CO) mixture by a high‐temperature electrochemical purification (HT‐ECHP) system is examined. Electrochemical H2 purification experiments were carried out in the temperature range of 140‐180°C. The effects of the molar ratio of the gases in the mixture (H2:CO2:CO‐75:25:0, H2:CO2:CO‐72:26:2,0 H2:CO2:CO‐75:22:3, H2:CO2:CO‐75:20:5, H2:CO2:CO‐97:0:3, H2:CO2:CO‐95:0:5) and the operating temperature on the electrochemical H2 separation were investigated. As a result of the electrochemical H2 purification experiments, it was determined that the operating temperature is the most important parameter affecting the performance. According to the results obtained, H2 purity of 99.999% was achieved at 160°C with the reformate gas mixture containing 72% H2, 26% CO2, and 2% CO by volume. According to the polarization curves of the gas mixtures containing CO, high current densities at low voltage were reached at 180°C, and it was observed that the performance increased as the temperature increased, whereas the gas mixture without CO gave the best performance at 160°C.

Enhanced proton conductivity in a Cu-BTC thin-film membrane through lysine incorporation and a mixed matrix membrane

“…The lower activation energy of Cu-BTC-Lys (43 wt%) falls within the energy range of the Grotthuss proton migration pathway, which involves proton hopping along formed hydrogen-bonding networks. 40,41 On the other hand, the other samples primarily followed the vehicle mechanism due to the limited Lys proton donors in the frameworks. The possible proton hopping routes are presented in Fig.…”