Engineering Work Function to Stabilize Metal Oxides in Reactive Hydrogen
| Autor: | Rehman, Abdul, van de Kruijs, Robbert W. E., Beld, Wesley T. E. van den, Sturm, Jacobus M., Ackermann, Marcelo |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Hydrogen, crucial for the green energy transition, poses a challenge due to its tendency to degrade surrounding wall materials. To harness hydrogen's potential, it is essential to identify materials' parameter(s) that modulate hydrogen-material interaction. In a recent publication, we have shown that the reduction (de-nitridation) of transition metal (TM)-nitrides in hydrogen radicals (H*) stops when their work function drops below a threshold limit. In this work, we tailor the work function of a complex TM-oxide by tuning the relative content of its constituent TM-atoms. We show that increasing the fraction of a low work function TM decreases the work function of the complex oxide, thereby decreasing its reducibility (de-oxidation) in H*. This leads to the stabilization of the higher oxidation states of a high work function TM, which otherwise readily reduce in H*. We propose that the work function serves as a tuneable parameter, modulating the interaction of hydrogen with TM compounds. Comment: main: 18 pages, 4 figures, supplemental: 13 pages, 16 figures, 1 table |
| Databáze: | arXiv |
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