期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 2, 页码 1011-1017出版社
AMER CHEMICAL SOC
DOI: 10.1021/am404536w
关键词
ultrathin g-C3N4 nanosheets; graphene; photoreduction; 3D porous supramolecular architecture; oxygen reduction reaction; electrocatalyst
资金
- National Natural Science Foundation of China [21175129]
- National Basic Research Program of China [2011CB935800]
- Scientific and Technological Development Plan Project of Jilin Province [20100534, 20110448]
Direct mixing of aqueous dispersions of ultrathin g-C3N4 nanosheets and graphene oxide (GO) under ultrasonication leads to three-dimensional (3D) porous supramolecular architecture. Photoreduction of GO yields conductive porous g-C3N4/rGO hybrid. The resulting 3D architecture possesses high surface area, multilevel porous structure, good electrical conductivity, efficient electron transport network, and fast charge transfer kinetics at g-C3N4/rGO interfaces, which facilitate the diffusion of O-2, electrolyte, and electrons in the porous frameworks during oxygen reduction reaction (ORR). Ultrathin g-C3N4 nanosheet also causes effective electron tunneling through g-C3N4 barrier, leading to rich electrode-electrolyte-gas three-phase boundaries, and shortens the electron diffusion distance from rGO to O-2. As a novel ORR catalyst, such 3D hybrid exhibits remarkable catalytic performance, outperformed other g-C3N4/rGO composites, and exhibits excellent durability.
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