Recently, the liquid-phase ambient laser preparation and processing laboratory of the Institute of Solid State Physics, Chinese Academy of Sciences, Hefei Research Institute of Materials Science has made new progresses in the preparation of pure nickel/graphene composites and in the electrocatalytic oxidation of methanol.
Nano-nickel-based catalysts have been widely recognized by researchers because of their high catalytic activity and low cost, and have become important non-platinum-based catalysts. Increasing nickel utilization by reducing the size of the nickel-based catalyst is a common method for increasing the efficiency of the nickel-based catalyst. However, the reduction in the size of nanoparticles always inevitably accompanies particle agglomeration and secondary growth. It is an effective way to improve the efficiency of nickel-based catalysts to obtain ultrafine nickel single-crystal nanocrystals with a large number of exposed active sites and no agglomeration growth.
In this study, the liquid phase laser ablation method was used as the technical means. Firstly, a highly active NiOx loaded nanocomposite material was obtained by electrostatic interaction between Ni colloidal nanoparticles (with positive charge) and graphene oxide (GO, with negative charge). The hydrazine hydrate solution is reduced to form elemental nickel. NiOx is reduced by hydrazine hydrazine to generate N2, creating an oxygen-free environment for the resulting elemental nickel, and finally obtaining a highly dispersed, ultra-small size pure graphene (2.3±0.4 nm) loaded graphene nanocomposite. Among them, the ultra-small size of elemental nickel provides a large number of active sites for the improvement of its catalytic performance, and the presence of graphene greatly limits its re-growth and aggregation in the catalytic process. Experiments show that the material exhibits high specific mass activity (1600mA/mg) and excellent stability in the electrocatalytic oxidation of methanol. After 1000 cycles, the elemental nickel still maintains its original size and morphology. Aggregation and secondary growth.
In this study, liquid-phase laser ablation technology was used to obtain the advantages of ultra-small nanocrystals, pure nickel monolithically supported graphene composites were prepared, and excellent electrocatalytic performance of methanol oxidation was exhibited, and other high electrochemical activity was designed and synthesized. The stable and non-platinum catalyst nanocrystals provide new ideas and strategies.
Related research results were published on Chemical Communications. The study was funded by the National Key Basic Research Development Program, the National Natural Science Foundation of China, the Scientific Research Equipment Development Project of the Chinese Academy of Sciences and the Natural Science Foundation of Anhui Province.
Figure 1. (a), Synthetic diagram of Ni/rGO; (b), (c), low and high resolution transmission pictures of Ni/rGO.
Figure 2. (a) Cyclic voltammograms of Ni/rGO in 1M KOH and 1M CH3OH+KOH solutions, respectively; (b) Cyclic voltammograms of Ni/rGO in 1-6M CH3OH+KOH solutions, respectively; (c) Comparison of mass activity of Ni/rGO and commercial Pt/C catalysts at different cycle times.
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