Journal
ADVANCED ENERGY MATERIALS
Volume 2, Issue 12, Pages 1510-1518Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201200214
Keywords
graphene; gold nanoparticle; layer-by-layer assembly; methanol oxidation; fuel cell
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Funding
- WCU (World Class University) program through the Korea Science and Engineering Foundation
- Ministry of Education, Science and Technology [R31-2008-000-20012-0]
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) [2010-0003219]
- New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Korea government Ministry of Knowledge Economy [20113020030060]
- National Research Foundation of Korea [2010-0003219] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study reports a simple method of integrating electroactive gold nanoparticles (Au NPs) with graphene oxide (GO) nanosheet support by layer-by-layer (LbL) assembly for the creation of 3-dimensional electrocatalytic thin films that are active toward methanol oxidation. This approach involves the alternating assembly of two oppositely charged suspensions of Au NPs with GO nanosheets based on electrostatic interactions. The GO nanosheets not only serve as structural components of the multilayer thin film, but also potentially improve the utilization and dispersion of Au NPs by taking advantages of the high catalytic surface area and the electronic conduction of graphene nanosheets. Furthermore, it is found that the electrocatalytic activity of the multilayer thin films of Au NPs with graphene nanosheet is highly tunable with respect to the number of bilayers and thermal treatment, benefiting from the advantageous features of LbL assembly. Because of the highly versatile and tunable properties of LbL assembled thin films coupled with electrocatalytic NPs, we anticipate that the general concept presented here will offer new types of electroactive catalysts for direct methanol fuel cells.
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