| Environmental pollution, food safety, energy crisis and other problems seriously threaten the health and sustainable development of human beings, becoming an urgent problem to be solved. Because of simple operation, fast detection, high accuracy, portability and other characteristics, surface enhanced Raman spectroscopy can be used as detection means with high sensitivity and has a wide application prospect in chemical molecular detection and identification. It is expected that the development of a high sensitive substrate with controllably good biocompatibility and high surface Raman spectroscopy enhancement is an important method to achieve high sensitive sensor.Hydrogen as a second and clean economic energy is an important alternative to non-renewable fossil fuels. Water electrolysis is an important method for hydrogen production.The efficiency of the process is strongly dependent on the development of the catalysts. Therefore the development of high activity, high efficiency water electrolysis catalyst with low overpotential is the prerequisite for large-scale application of hydrogen energy. Especially, the non-noble metal catalyst in alkaline solution is mainly to obtain high catalytic activity and long durability, and low cost, as a result 3d transition metal oxides / hydroxides become focus of this research.In this paper, we used PS-NH2 nanoparticles as template, and combined with chemical plating and dealloying to fabricate NPAu. On the other hand by coordinated etching deposition method(CEP), we synthesis M(OH)2(M =Mn, Fe, Co, Ni) and cobalt binary series complex Co M(M=Mn,Ni,Zn) composite hydrogen oxides. Respectively, these two materials were studied surface-enhanced Raman spectrum and electrochemical oxygen evolution reaction, and obtain the following conclusion:1.NPAu hollow nanostructure has the characteristics of hollow structure and continuous porous structure at the same time, which can significantly improve the Raman enhancement effect, and the limiting detection concentration of R6 G probe molecules can reach ~10-12 M. The Study has shown that interconnected porous structure of the shell of PS-NH2/NPAu hollow nanostructures, not only greatly increased the surface area and adsorbed more R6 G molecules, and nanoscale gold ligament exhibit a strong electromagnetic field under laser excitation, and coupled with adjacent ones to create lots of hot spots(hot-spot), which has greatly improve the surface enhanced Raman effect.2.The characteristics of transition metal are rich content and low cost.M(OH)2(=Mn Fe, Co, Ni, M) and cobalt series binary Co M(M=Mn, Zn, Ni) composite hydroxide can be used as cheaper catalyst, replacing Ir, Ru and their oxides in alkaline solution. For M(OH)2(=Mn Fe, Co, Ni, M), wherein the strength of M2+(=Mn Fe, Co, Ni, M) and the OH bond is in the order of Ni<Co<Fe<Mn, so electrochemical oxygen evolution activity is in the order of Ni(OH)2>Co(OH)2>Fe(OH)2>Mn(OH)2.At the same time, because of the characteristics of hollow structure, with bigger specific surface area and more active reaction sites, theelectrochemical evolution of oxygen evolution has improved in some extent, compared tocorrespondingsubstrates. For Co M(M=Mn, Ni, Zn) composite hydroxide, theelectrochemical properties of Co Mn and Co Ni composites were not significantly improved. Because the Zn play support and synergistic in Co Zn composite hydroxide, while the characteristics ofhollow structure can provide more electrochemical active sites, the electrochemical properties of Co Zn composite hydroxide are significantly enhanced. |
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