采用两步法制备了过渡金属Fe、Co、Ni不同比例的介孔钼酸盐纳米棒。通过X-射线粉末衍射仪、扫描电子显微镜、透射电子显微镜、能谱仪以及氮气吸脱附测试系统等对其物相、形貌、结构、孔尺寸等性质进行了表征。结果表明,所合成出的不同Fe、Co、Ni比例的钼酸盐都呈现纳米棒状的形貌,并且在纳米棒上具有丰富的介孔,这些介孔可以提供更多的活性位点。通过调节催化剂中Fe、Co、Ni元素的比例,增强催化剂中多金属之间的协同作用,从而提高催化过程中的电荷转移速率,优化了析氧反应催化性质。催化性能测试结果显示,当Fe∶Co∶Ni=1∶1∶1时,样品具有最好的催化活性,电流密度为10 m A·cm^(-2)时的过电位仅为330 m V,该性能可以与商业用的贵金属催化剂Ir O2聘美。
Lanthanide-doped luminescent inorganic nanoparticles(NPs)possess superior physicochemical features such as long-lived luminescence(from several to tens of milliseconds),large apparent Stokes and/or anti-Stokes shifts,...
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Lanthanide-doped luminescent inorganic nanoparticles(NPs)possess superior physicochemical features such as long-lived luminescence(from several to tens of milliseconds),large apparent Stokes and/or anti-Stokes shifts,narrow emission bands,high resistance to photobleaching and low toxicity,and thus are regarded as a new generation of bioprobes as compared to conventional molecular probes like organic dyes and lanthanide *** functional NPs,albeit most of their bulk counterparts were well studied previously,have stimulated the growing interests in the deep insights of their spectroscopic properties coupled with their biomedical applications in diverse fields such as biodetection,disease diagnosis and therapeutics.
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