Newly Designed Graphene Cellular Monolith Functionalized with Hollow Pt-M (M = Ni, Co) Nanoparticles as the Electrocatalyst for Oxygen Reduction Reaction
| Autor: | Xiaonong Cheng, Yazhou Zhou, Chengzhou Zhu, Juan Yang, Yuehe Lin, Chien M. Wai, Dan Du, Clive H. Yen |
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| Rok vydání: | 2016 |
| Předmět: |
geography
Materials science geography.geographical_feature_category Graphene Inorganic chemistry Oxide Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Ascorbic acid Electrocatalyst 01 natural sciences 0104 chemical sciences law.invention Catalysis Sodium borohydride chemistry.chemical_compound chemistry Chemical engineering law General Materials Science Monolith 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 8:25863-25874 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.6b04963 |
| Popis: | Newly designed graphene cellular monoliths (GCMs) functionalized with hollow Pt-M nanoparticles (NPs) (Pt-M/GCM, M = Ni, Co) have been successfully achieved by a facile and powerful method on the basis of sonochemical-assisted reduction and gelatinization processes. First, hollow Pt-M (M = Ni, Co) NPs were synthesized and distributed on graphene oxide sheets (Pt-M/GO) by sodium borohydride reduction of metal precursors in the ultrasonic environment. Second, the hollow structure was further formed by ascorbic acid (AA) reduction of Pt precursors in gelatinization process. Meanwhile, GO sheets with hollow Pt-M NPs were reduced to graphene, and were assembled into Pt-M/GCM hydrogels by gelatinization process. The Pt-M/GCM (M = Ni, Co) electrocatalysts have a factor of 9.4–18.9 enhancement in electrocatalytic activity and higher durability toward oxygen reduction reaction (ORR), compared with those of commercial Pt/C catalyst. In detail, the mass activities for Pt–Ni/GCM and Pt–Co/GCM are 1.26 A mgPt–1 and 1.... |
| Databáze: | OpenAIRE |
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