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Natural hematite ore composited with ZnO nanoneedles for energy applications
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2018 (English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069, Vol. 137, p. 178-183Article in journal (Refereed) Published
Abstract [en]

Natural hematite ore is used as a novel photocatalyst for visible photocatalyst and also for advanced fuel cell applications. The hematite was composited with needle-shaped ZnO via a hydrothermal approach. This hematite-based system exhibits excellent photodegradation for methelyene blue within 40 min when the hematite is hybridized with wurzite-structured ZnO under visible light irradiation. The hybrid heterojunction was characterized by the transmission electron microscopy, ultraviolet–visible diffuses reflectance spectra, cyclic voltammetry, and AC impedance spectroscopy. The photocatalytic activity of the heterojunction was evaluated by the photodegradation of MB dye. The high photocatalytic activity observed under visible light is discussed on basis of the coupling of the hybrid heterojunction band structure. On the other hand, hematite ore and its composites were also used for advanced fuel cells. At 550 °C, 182 mW cm−2 and 580 mW cm−2 were achieved for fuel cells using raw hematite and composite with ZnO as the electrolytes, respectively. The heterostructure energy band alignment is proposed. These results demonstrate that the natural composites for next-generation functional semiconductor-ionic materials can influence the multi-utilization of natural resources, thereby affecting the environment and energy sustainability.

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 137, p. 178-183
Keywords [en]
Composite heterogeneous electrolyte, Natural hematite, Needle-shaped ZnO, Photocatalyst, Solid oxide fuel cells, Band structure, Complexation, Cyclic voltammetry, Electrolytes, Fuel cells, Gas fuel purification, Hematite, Heterojunctions, High resolution transmission electron microscopy, Light, Needles, Photocatalysis, Photocatalysts, Photodegradation, Solid electrolytes, Solid oxide fuel cells (SOFC), Sustainable development, Transmission electron microscopy, Wide band gap semiconductors, Zinc oxide, Ac impedance spectroscopy, Energy applications, Energy-band alignment, Environment and energies, High photocatalytic activities, Photocatalytic activities, Reflectance spectrum, Visible-light irradiation, Zinc compounds
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-223117DOI: 10.1016/j.compositesb.2017.11.020ISI: 000428487200017Scopus ID: 2-s2.0-85034036778OAI: oai:DiVA.org:kth-223117DiVA, id: diva2:1193672
Note

Export Date: 13 February 2018; Article; CODEN: CPBEF; Correspondence Address: Zhu, B.; Hubei Collaborative Innovation Center for Advanced Organic Materials, Faculty of Physics and Electronic Science, Hubei UniversityChina; email: binzhu@kth.se; Funding details: NGM2017KF012; Funding details: NGM2017KF004; Funding details: 51774259, NSFC, National Natural Science Foundation of China; Funding details: NSFC, National Natural Science Foundation of China. QC 20180327

Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-04-16Bibliographically approved

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