Skowroński J M, Rozmanowski T, Krawczyk P, Rogulski Z, Czerwiński A
Institute of Chemistry and Technical Electrochemistry, Poznań University of Technology, ul. Piotrowo 3, 60-965 Poznań, Poland.
J Nanosci Nanotechnol. 2009 Jun;9(6):3858-65. doi: 10.1166/jnn.2009.ns80.
The kinetics of the process of reversible hydrogen sorption occurring in/on the nickel foam/palladium/carbon nanofibers (Ni/Pd/CNFs) electrodes is examined. It was shown that the hydrogen sorption/desorption properties for palladium can be altered after Pd layer is sandwiched between nickel foam and carbon nanofibers (CNF) layers. The layered Ni/Pd/CNFs electrodes were prepared by a two-step method consisting of chemical deposition of a very thin palladium layer on the Ni foam surface to form Ni/Pd electrodes followed by coating the Pd surface with the CNF layer by the CVD method. The process of hydrogen sorption/desorption into/from Ni/Pd as well as Ni/Pd/CNF electrodes was examined in alkaline electrolyte using the cyclic voltammetry method. The presence of CNF layer on the Pd surface exerts a great influence on the mechanism of the anodic desorption of hydrogen. A new anodic peak of hydrogen desorption revealed for Ni/Pd/CNF electrodes is ascribed to hydrogen storage in CNF phase. The CV measurements showed distinct differences between the rate of hydrogen release from the palladium and carbon phase.
研究了在泡沫镍/钯/碳纳米纤维（Ni/Pd/CNFs）电极上发生的可逆氢吸附过程的动力学。结果表明，当钯层夹在泡沫镍和碳纳米纤维（CNF）层之间时，钯的氢吸附/解吸性能会发生改变。层状Ni/Pd/CNFs电极通过两步法制备，第一步是在泡沫镍表面化学沉积一层非常薄的钯层以形成Ni/Pd电极，第二步是通过化学气相沉积法在钯表面涂覆CNF层。使用循环伏安法在碱性电解质中研究了氢在Ni/Pd以及Ni/Pd/CNF电极中的吸附/解吸过程。钯表面CNF层的存在对氢的阳极解吸机理有很大影响。Ni/Pd/CNF电极上出现的新的氢解吸阳极峰归因于CNF相中储存的氢。循环伏安测量显示钯相和碳相的氢释放速率存在明显差异。
