The sluggish oxygen reduction reaction (ORR) kinetics and the fast performance degradation caused by Cr-poisoning greatly hinder the commercialisation of an LaxSr1–xCoyFe1–yO3–θ (LSCF) cathode in solid oxide fuel cells (SOFCs). Herein, a surface regulating and hetero-interface engineering method by chemical vapour deposition (CVD) was applied to construct a CeO2-coated LSCF cathode with enhanced ORR activity and durability. By controlling the CVD operating time, and the thickness of the CeO2 coating, the CeO2/LSCF heterointerface could be precisely engineered. With the optimal CVD time of 7 min, the x-LSCF cathode exhibited a minimal polarisation resistance (Rp) value of 0.11 Ω cm2 at 750 °C, which is almost one-fifth of that of an LSCF cathode (0.46 Ω cm2). Moreover, the CeO2-coated LSCF cathode exhibited a much lower degradation rate than the LSCF cathode in the long-term Cr-poisoning test. The improved ORR catalytic activity and durability of the CeO2-coated LSCF cathode were also verified in the single-cell mode. This study provides a comprehensive and novel strategy for tailoring the surface of the SOFC cathode for achieving enhanced performance and Cr-tolerance.
In this study, a 2-isopropyl-aminopyridine adduct of cobalt(II) chloride [Co(2- i PrNH-C 5 H 4 N) 2 Cl 2 ] was synthesized and used as a precursor for preparing cobalt-based films through chemical vapor deposition (CVD). This compound was synthesized through a simple coordination reaction and characterized through 1 H NMR, elemental analysis, and single-crystal diffraction. The thermal properties (including volatility, vapor pressure, and thermal stability) of the compound were investigated through thermogravimetric analysis (TGA) to determine its feasibility for use in CVD. Moreover, a film deposition experiment was conducted in a low-pressure CVD reactor system, and a Co 3 O 4 film was obtained. This result verified the reported compound’s applicability as a CVD precursor for fabricating cobalt-based films.
High purity H 2 formed by electrochemical water splitting is profound potential green energy. Exploiting advanced electrocatalysts for hydrogen evolution reaction (HER) in both acidic and base environment is of critical significance. Herein, we report a novel hybrid comprising stacked cobalt tungsten carbides nanocrystals on N-doping carbon matrix (Co 6 W 6 C–N@CNFs) as a superb HER catalyst over the entire pH range via facile electrospinning and CVD method. On account of its ultrathin size and the strong synergetic interaction between bimetals , coupled with the superior conductivity of N-doping CNFs , Co 6 W 6 C–N@CNFs presents superior catalytic properties , with low overpotentials of 86 and 116 mV at η 10 and small Tafel slopes of 85 and 101 mV dec −1 in acidic and alkali, respectively, as well as outstanding long-term stability, rivalling its potential to be used intensively in water electrolysis technologies.
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