期刊
CHEMSUSCHEM
卷 7, 期 11, 页码 3017-3020出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402535
关键词
electrolysis; membranes; pH gradient; solar fuels; water splitting
资金
- Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Energy Biosciences, Department of Energy [DE-FG02-07ER15911]
- National Science Foundation [DGE1255832]
Membranes are important in water-splitting solar cells because they prevent crossover of hydrogen and oxygen. Here, bipolar membranes (BPMs) were tested as separators in water electrolysis cells. Steady-state membrane and solution resistances, electrode overpotentials, and pH gradients were measured at current densities relevant to solar photoelectrolysis. Under forward bias conditions, electrodialysis of phosphate buffer ions creates a pH gradient across a BPM. Under reverse bias, the BPM can maintain a constant buffer pH on both sides of the cell, but a large membrane potential develops. Thus, the BPM does not present a viable solution for electrolysis in buffered electrolytes. However, the membrane potential is minimized when the anode and cathode compartments of the cell contain strongly basic and acidic electrolytes, respectively.
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