S. Azizi, M. Askari, M. T. T. Moghadam, M. Seifi, A. Di Bartolomeo
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引用次数: 3
摘要
我们提出了一步水热合成由Ni3S4-NiS (NN)和Ni3S4-NiS -rGO (NNR)形式的硫化镍组成的杂化物,即加入还原氧化石墨烯(rGO)作为催化剂。在进行了准确的物理表征和确认成功合成后,我们评估了这些催化剂在甲醇和乙醇氧化过程中的能力。精确的电化学分析表明,该材料在甲醇氧化反应(MOR)和乙醇氧化反应(EOR)过程中具有较好的应用潜力和良好的循环稳定性。两种催化剂的比较表明NNR优于NN,证实了还原氧化石墨烯在NNR结构中引入了更高的比表面积和更高的导电性。在MOR过程中,NNR在电流密度为55 mA cm−2时出现氧化峰,峰值电位为0.54 V。在EOR中,该峰值位于电流密度为11 mA cm - 2,峰值电位为0.59 V。连续1000次循环后,NNR的MOR和EOR稳定性分别为97%和94%,这是可接受的值。
Ni3S4/NiS/rGO as a promising electrocatalyst for methanol and ethanol electro-oxidation
We present a one-step hydrothermal synthesis of hybrids consisting of nickel sulfides in the form of Ni3S4–NiS (NN) and Ni3S4–NiS-rGO (NNR), i.e. with the addition of reduced graphene oxide (rGO), for application as catalysts. After accurate physical characterization and confirmation of successful synthesis, we evaluate the ability of these catalysts in the processes of methanol and ethanol oxidation. The precise electrochemical analyses show relatively good potential and excellent cyclic stability in methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR) processes. The comparison of the two catalysts shows the superiority of NNR over NN, confirming that rGO introduces a higher specific surface area and a higher electrical conductivity in the NNR structure. In the process of MOR, NNR has an oxidation peak at a current density of 55 mA cm−2 and a peak potential of 0.54 V. In EOR, this peak is located at a current density of 11 mA cm−2 and at a peak potential of 0.59 V. NNR has 97% and 94% stability in MOR and EOR after 1000 consecutive cycles, respectively, which are acceptable values.
期刊介绍:
Nano Futures mission is to reflect the diverse and multidisciplinary field of nanoscience and nanotechnology that now brings together researchers from across physics, chemistry, biomedicine, materials science, engineering and industry.