Non-precious Ir–V bimetallic nanoclusters assembled on reduced graphenenanosheets as catalysts for the oxygen reduction reaction
文献信息
Wei Chen
IrxV bimetallic nanoclusters assembled on reduced graphene nanosheets (IrxV/rGO) with different compositions (x = 2, 11, 14, 21) were synthesized by a simple surfactant-free solution phase process at varied ratios of IrCl3 and NH4VO3 precursors. The structural characterizations confirmed that the synthesized nanoclusters with a clean surface were densely and uniformly assembled on rGO nanosheets with an average size of around 2 nm. The electrochemical measurements demonstrated that the electrocatalytic activities of IrxV/rGO hybrids for the oxygen reduction reaction (ORR) in alkaline media depends on the contents of iridium and vanadium in the nanoclusters. Compared to the pure iridium nanoclusters supported on rGO (Ir/rGO) and other compositions of IrxV/rGO, the Ir2V/rGO exhibited the maximum current density of ORR and superior tolerance against methanol crossover. From the rotating disk (RDE) and rotating ring-disk electrode (RRDE) measurements, the ORR occurs on Ir2V/rGO mainly through an efficient four-electron pathway. Furthermore, based on the structural and electrochemical studies, such Ir2V/rGO hybrids have obvious advantages as cathode electrocatalysts, such as an enhanced surface area due to the small size of Ir2V nanoclusters and their high dispersion on rGO nanosheets, low cost because of the precious metal-free components, and high electrocatalytic performance for the ORR from the synergistic effect of the alloyed Ir–V crystalline phase. It is anticipated that the IrxV nanoclusters assembled on rGO can be used as promising Pt-free cathodes in alkaline fuel cells.
期刊推荐

Colloid Journal

Main Group Chemistry

Polycyclic Aromatic Compounds

Topics in Catalysis

Chinese Journal of Chemistry

Medicinal Chemistry Research

Journal of Asian Natural Products Research

Critical Reviews in Solid State and Materials Sciences

Journal of the Indian Institute of Science

Journal of Chemical Sciences
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来源期刊
Journal of Materials Chemistry A

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment
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