Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The increasing demand for solar fuels such as hydrogen as most promising energy carrier requires new materials for electro-catalytic splitting of water or the back-transformation of hydrogen into electricity. Especially, the oxygen electrode caused by sluggish kinetics is hampering progress for cheap hydrogen made by water electrolysis. Moreover the high costs and low abundance of current highly active noble metal catalysts such as Iridium oxide and Platinum require new developments for novel, cheap and abundant materials. In this context we developed a new two-component catalyst system consisting of Nickel-Iron layered double hydroxide (NiFe-LDH) and Fe-N doped carbon material (Fe-N-C) as non noble bifunctional catalyst for the oxygen electrode in alkaline unitized reversible fuel cells/electrolyzers (URFC). The combination of NiFe-LDH known as most active non-noble catalyst for the oxygen evolution reaction (OER) in alkaline media and Fe-N-C known as highly active catalyst for the oxygen reduction reaction (ORR) resulted in a combined overpotential with their respective advantages. NiFe-LDH was prepared by a simple and time-saving microwave assisted solvothermal synthesis route. The crystallinity was confirmed by X-ray diffraction (XRD) spectroscopy and transmission electron microscopy (TEM) verified morphological characteristics. Rotating ring disk (RRDE) measurement revealed high selectivity for the multi-component catalyst. We further investigated the catalyst behaviour under realistic conditions in a membrane based reversible electrolyzer using an anion exchange membrane (AEM, Tokuyama A201). Compared to noble catalyst materials the membrane electrode assembly (MEA) measurements proved the ability to compete and supported the initial high activities.
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