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Indexed by:期刊论文

Date of Publication:2018-07-01

Journal:JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY

Included Journals:SCIE、EI、PubMed

Volume:18

Issue:7

Page Number:4667-4674

ISSN No.:1533-4880

Key Words:MOF; gamma-Fe2O3@Carbon; Electrocatalyst; H2O2; Electron Reduction of O-2

Abstract:H2O2 production from electron reduction of oxygen (O-2) is considered to be a potential alternative to the current anthraquinone process. Herein, we reported a mesoporous catalyst with iron-carboxylate metal-organic framework (MOF) as precursors to catalyze O-2 to hydrogen peroxide (H2O2). Ironcarboxylate MOF (Fe-MOF) was synthesized by the novel cetyltrimethylammonium bromide (CTAB)citric acid (CA) double-template method. The SEM and SAXD results revealed octahedral structure of the nanoparticles, as well as the presence of mesopores in the Fe-MOF, while the molar ratio 2.03 of CTAB to CA that resulted in the largest value (0.914 cm(3) g(-1)) of the mesopores in the Fe-MOFs. The pyrolysis of Fe-MOF with the largest amount of mesopores resulted in its carbonization and produced gamma-Fe2O3@carbon material, significantly reduced the BET surface area from 3036 m(2) g(-1) to 387 m(2) g(-1), but increased the average pore diameter up to 5.78 nm and disintegrated their octahedral structures to an irregular morphology of Fe-MOF (550), and modified the carbon matrix with trace oxygen and metal oxides. The gamma-Fe2O3@carbon material possessed mesoporous structure, with predominant graphitic carbon in the matrix (graphite to amorphous carbon ratio 0.79), which contributed to increased potential for electron reduction of O-2 through a 2e(-) electron transfer pathway.