Abstract
Carbon-supported NiMo catalysts (NiMo/C) were synthesized and investigated for the electrooxidation of hydrazine. Their morphology and composition were determined with physicochemical characterizations (TEM-EDS, XPS and XRD) and further bridged to their electrocatalytic activity. The electrochemical performances measured in rotating disk electrode experiments reached 7.68 ± 0.96 kA gmetal−1 for hydrazine electrooxidation at E = 0.4 V vs. RHE for the carbon-supported NiMo (9:1)/C. This value is amongst the highest reported in the literature. The large activity of the carbon-supported NiMo (9:1)/C catalyst was ascribed to the effect of a low but non-negligible (<15 at. %) molybdenum content, as molybdenum atoms stabilize the hydrazine N-N bond, thereby preventing the chemical decomposition of hydrazine into ammonia, and improving the catalyst selectivity towards the complete (and desired) hydrazine oxidation into N2 gas.
Original language | English |
---|---|
Pages (from-to) | 420-426 |
Number of pages | 7 |
Journal | Electrochimica Acta |
Volume | 215 |
DOIs | |
State | Published - Oct 10 2016 |
Externally published | Yes |
Funding
VASP license was provided through Theoretical division, LANL, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC52-06NA25396. Computational work was performed using the computational resources of EMSL , a national scientific user facility sponsored by the Department of Energy's Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory, NERSC , supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, and CNMS , sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. MC thanks the French University Institute for funding.
Keywords
- Ammonia Generation
- Direct Hydrazine Fuel Cell
- Molybdenum
- Ni-based catalyst
- Nickel