Enhanced and Facet-specific Electrocatalytic Properties of Ag/Bi2Fe4O9 Composite Nanoparticles.
Kai WangXiaoguang XuLiying LuHaicheng WangYan LiYong WuJun MiaoJin Zhong ZhangYong JiangPublished in: ACS applied materials & interfaces (2018)
Ag/Bi2Fe4O9 nanoparticles (BFO NPs) have been synthesized using a two-step approach involving glycine combustion and visible light irradiation. Their structures were characterized in detail using X-ray diffraction, transmission electron microscope, scanning electron microscopy, and scanning transmission electron microscopy techniques. Their electrocatalytic properties were studied through enzymatic glucose detection with an amperometric biosensor. The Ag deposited on selective crystal facets of BFO NPs significantly enhanced their electrocatalytic activity. To gain insights into the origin of the enhanced electrocatalytic activities, we have carried out studies of Ag+ reduction and Mn2+ oxidation reaction at the {200} and {001} facets, respectively. The results suggest effective charge separation on the BFO NP surfaces, which is likely responsible for the enhanced electrocatalytic properties. Furthermore, enhanced ferromagnetism was observed after the Ag deposition on BFO NPs, which may be related to the improved electrocatalytic properties through spin-dependent charge transport. The facet-specific electrocatalytic properties are highly interesting and desired for chemical reactions. This study demonstrates that Ag/BFO NPs are potentially useful for electrocatalytic applications including biosensing and chemical synthesis with high product selectivity.
Keyphrases
- electron microscopy
- reduced graphene oxide
- visible light
- metal organic framework
- quantum dots
- gold nanoparticles
- highly efficient
- room temperature
- high resolution
- hydrogen peroxide
- oxide nanoparticles
- magnetic resonance imaging
- radiation therapy
- escherichia coli
- label free
- risk assessment
- insulin resistance
- single molecule
- heavy metals
- biofilm formation
- municipal solid waste
- liquid chromatography
- transition metal