Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Generation of hydrogen via electrochemical water splitting is one of promising technologies to overcome our dependency on fossil fuels, but the efficiency of this process is very low without catalysis of both half-reactions. Particularly, catalysis of the oxygen evolution reaction (OER) is of great importance for improving the total efficiency of water electrolysis. Doped nickel oxide-based compounds attract great interest as very efficient and abundant catalysts. [1][2][3] However, in spite of the large number of publications, there is still no clear understanding on the exact role of dopants in the catalytic process. The discrepancy in the literature data can be largely explained by the large number of possible active phases in the nickel oxide system and the complex dynamic character of their transformations. [4] We have developed a synthesis procedure enabling controllable formation of nanosized nickel hydroxide and nickel oxide polymorphs substituted with transition metal ions such as V, Cr, Mn, Co, Ru, Ir, Ce and investigated their structure-activity correlation in electrochemical water oxidation supported by electron microscopy and electrochemical measurements on quartz crystal microbalance sensors. The difference in electrocatalytic activity could be mainly attributed to the inhibited crystallization of highly active α-Ni(OH)2 [5] to a less active, but more stable β-polymorph [1] by transition metal ions, which is important for understanding the mechanisms of electrocatalytic activity of nickel oxide-based compounds.
The authors gratefully acknowledge funding by the German Research Foundation (DFG SPP1613, Solar-H2 program), the NIM cluster (DFG), the research networks “Solar Technologies Go Hybrid”, UMWELTnanoTECH (State of Bavaria) and the Center for NanoScience (CeNS) for financial support.
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