Engineering multi-dimensional nanocarbons with enhanced electrochemical activity as high-performance bifunctional electrocatalyst
Environment-friendly metal-free electrocatalysts with high performance and stability are highly desirable for energy conversion and storage instead of noble metal materials. Here we report a three dimensional carbon-based porous aerogel as a bifunctional electrocatalyst by combining carbon nanostructures of various dimensionalities such as carbon onions, carbon nanotubes and graphene oxide. Notably, this all-carbon composite without any transition-metal or heteroatom doping exhibits excellent performance towards both oxygen evolution and oxygen reduction reactions. Our characterizations reveal that the enhancement can be ascribed to the porous-rich structure and large specific surface areas in the integrated nanocarbons architectures. This strategy represents a step toward the design of all-carbon bifunctional catalysts with high performance and low cost.
KeywordsAll-carbon composite Bifunctional electrocatalyst OER ORR XAFS
This work is financially supported by 973 Program (2014CB848900 and 2017YFA0303500), NSFC (U1532112, 11574280, 11605201), Anhui Provincial Natural Science Foundation (1708085QB27), CAS Key Research Program of Frontier Sciences (QYZDB-SSW-SLH018) and CAS Iterdisciplinary Innovation Team, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University. L.S. acknowledges the recruitment program of global experts, the CAS Hundred Talent Program. We thank the Hefei Synchrotron Radiation Facility (Photoemission and MCD Endstations, NSRL), and the USTC Center for Micro and Nanoscale Research and Fabrication for helps in characterizations.