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Nickel exists as Ni 0 and as Gd 3+, gadolinium as Gd 3+, and zirconium as Zr 4+, according to XPS in CNF/Zr/Gd composites pyrolyzed at 1000 °C, although in CNF/Zr/Zr/Ni/Gd composites pyrolyzed at 1000 u00b0C. Nickel exists only as Ni 0 if CNF/Zr/Gd is pyrolyzed at 1200 Ctu00b0C. When cobalt is not present on a surface, the Samarium is in Sm 3+ form for CNF/Sm/Co composite. Cerium is both Ce 4+ and Ce 3+ for the CNF/Zr/Ce composite. As cathodes in a high-temperature polymer electrolyte membrane fuel cell, composite CNF mats were platinized and tested as cathodes. Pt2013M and Ptu2013MO x are more durable than carbon black under HT-PEMFC operation, thanks to this approach. In the HT-PEMFC, higher results can be achieved thanks to the elimination of mass transfer losses in the gas-diffusion electrode, as compared to commercial Celtec's P1000.
Source link: https://doi.org/10.3390/polym12061340
To produce a ZIF-67/CNFs composite using a one-pot synthesis device, a co-based porous metal-organic framework of zeolitic imidazolate framework-67 and carbon nanofiber scaffold was used to create a ZIF-67/CNFs composite. Due to the synergistic effects of ZIF-67 and CNFs, a ZIF-67/CNFs based sensor demonstrated higher electrocatalytic activity against H2O2 than a pure ZIF-67-based sensor. A linear range of 0. 0025 to 0. 19 mM is shown by the sensor results, which indicated high-efficiency electrocatalysis toward H2O2 with a detection limit of 0. 62 mM, a sensitivity of 323 mM, as well as good selectivity and long-term stability.
Source link: https://doi.org/10.3390/molecules23102552
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