模板法合成磷化铁空心纳米棒及其电化学性质

Template-Assisted Synthesis of Iron Phosphide Hollow Nanorods and Its Electrochemical Properties

作为储能材料,过渡金属磷化物在近年来受到了人们广泛关注。以水热合成的MoO_(3)纳米纤维为模板制备FeP空心纳米棒,系统表征其化学成分、结构形貌和制备过程,并研究其作为超级电容器电极材料的电化学性质。结果表明:Fe P空心纳米棒内有空腔,外壁由纳米颗粒堆叠、聚集、粘连而成,厚度约为30 nm,形态完好,具有发达的多孔特性和高达277.4 m^(2)/g的比表面积。得益于这些独特结构形貌和大比表面积,FeP空心纳米棒电极在三电极体系下的最大比电容可达243.6 F/g,且拥有优异的倍率性质和循环稳定性,在5 A/g高电流密度下经历反复充放电10000次后的电容损失率仅13.8%。FeP空心纳米棒出众的电化学行为能媲美甚至优于许多已报道的铁基超级电容器电极材料的电化学表现,展现出了良好的储能优势。

As energy storage materials,transition metal phosphides have attracted recent attention.In this paper,FeP hollow nanorods were fabricated with hydrothermally synthesized MoO_(3)nanofibers as a template.The chemical composition,morphological structure and synthetic process of such a product were characterized.Its supercapacitive properties as an electrode material were also investigated.The results show that the developed FeP hollow nanorods have a porous nature with the specific surface area(i.e.,277.4 m^(2)/g)and well-defined interior of about 30 nm thick shell due to the stack,aggregation and adhesion of FeP nanoparticles.The FeP hollow nanorod electrode with a unique morphological structure and a large specific surface area has a superior supercapacitive behavior with the maximum specific capacitance of 243.6 F/g,remarkable rate capability as well as outstanding cycling stability.The capacitance decay of only 13.8%can be achieved after consecutive charge/discharge for 10000 cycles at a large current density of 5 A/g.The electrochemical performance of FeP hollow nanorods is better than that of some Fe-based supercapacitor electrode materials previously reported.