Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/43724
Title: Graphene-Metal Organic Framework Composites and Their Potential Applications
Authors: MARYAM JAHAN
Keywords: Graphene, metal organic framework, nanocomposite,electrocatalyst, energy application,catalyst
Issue Date: 29-Jan-2013
Source: MARYAM JAHAN (2013-01-29). Graphene-Metal Organic Framework Composites and Their Potential Applications. ScholarBank@NUS Repository.
Abstract: This study presents a series of results on graphene - metal organic framework (MOF) composites and investigates their potential applications. We synthesized graphene sheets which are functionalized by benzoic acid functional groups (BFG) on the basal planes, and these were then used as bifunctional nanoscale building block for making graphene-MOF composites with MOF-5. BFG can act as a structure directing template in influencing the crystal growth of MOF. The intercalation of graphene in MOF imparts new electrical properties such as photoelectric transport in the otherwise insulating MOF. In addition, we synthesized pyridine ligand-functionalized graphene used as building blocks in the assembly of MOF. By adding the functionalized graphene to iron-porphyrin, a graphene-metalloporphyrin hybrid MOF which exhibits high specific surface area and robust catalytic activity for the oxidation of cyclohexane at 150 oC and 150 psi O2 was synthesized. The graphene-metalloporphyrin MOF can also enhance catalytic activity of oxygen reduction reactions (ORR). The graphene-metalloporphyrin hybrid shows facile 4-electron ORR and can be used as a promising Pt-free cathode in alkaline Direct Methanol Fuel Cell. Efficient catalysts are very important for electrochemical energy applications in fuel cells, batteries and electrochemical water splitting. Intercalated graphene oxide and Cu (II)-centered MOF shows enhanced electrocatalytic properties for hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). The GO-intercalated composites exhibit smaller overpotentials and higher current for all electrocatalytic reactions and show better stability in acid media compared to pure MOF. In Polymer Electrolye Membrane (PEM) fuel cell testing, the Cu-MOF composite delivers power density that is 76% that of the commercial Pt catalyst.
URI: http://scholarbank.nus.edu.sg/handle/10635/43724
Appears in Collections:Ph.D Theses (Open)

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