Hydrogen separation using electrochemical method

Characterisation of a electrochemical hydrogen pump using electrochemical impedance spectroscopy

“…As a consequence, the possibility to extract hydrogen from a gas mixture using such electrochemical pump should be limited to sufficiently rich ([H 2 ] [ 50%) gas mixtures, in agreement with the results of Ref. [7]. The less concentrated the mixture is, the less efficient the process is.…”

Electrochemical separation of hydrogen from reformate using PEM fuel cell technology

“…In addition, as discussed by Rohland et al [3], the same device can be used for hydrogen compression. The separation of hydrogen/nitrogen/carbon dioxide mixtures has been studied Lee et al [4]. In a recent paper [5], we have studied the separation of hydrogen from methane with the aim of using the existing natural gas pipeline system for the distribution of hydrogen.…”

Sol-Gel Based Polybenzimidazole Membranes for Hydrogen Pumping Devices

“…will be employed, using the heat of combustion of hydrogen, 1.484 V. 17,22 This ε voltage excludes losses from entropy and potential differences in the cell. In contrast, the electrochemical cell that was feed a constant stream of nonhumidified gas has a resistance that is a nearly third larger than the nonhumidified cycle and then increases to fifty percent higher above 1A/cm 2 .…”

“…12,13 Low temperature (<100°C) PEM-based electrochemical hydrogen pumping is capable of separating hydrogen as long as the other gas constituents do not poison the catalyst or diffuse through the membrane. 10,[14][15][16][17][18][19][20][21][22] When platinum is the catalyst in a low temperature PEMFC, one such undesirable impurity is carbon monoxide (CO) as it adsorbs onto the catalyst surface and inhibits its electrochemical activity. Low temperature PEMFCs can suffer significant performance losses if the CO levels are greater than few ppm and thus impose similar restrictions for low temperature hydrogen pumps.…”