Abstract
Porous carbon are excellent electrode materials for energy-storage devices. Here, we present a facile in-situ reduction method to improve the electrochemical performance of carbon materials by gold nanoparticles. The prepared porous carbon microspheres decorated with gold-nanoparticle had a 3D honeycomb-like structure with a high specific surface area of about 1635 m2 g−1, confirmed by scanning electron microscopy, transmission electron microscopy, and the Brunauer-Emmett-Teller method. The electrochemical performance of as-synthesized porous carbon microspheres was exemplified as electrode materials for supercapacitor with a high specific capacitance of 440 F g−1 at a current density of 0.5 A g−1, and excellent cycling stability with a capacitance retention of 100% after 2000 cycles at 10 A g−1 in 6 M KOH electrolyte. Our method opened a new direction for the gold-nanoparticle-decorated synthesis of porous carbon microspheres and could be further applied to synthesize porous carbon microspheres with various nanoparticle decorations for numerous applications as energy storage devices, enhanced absorption materials, and catalytical sites.
Highlights
Porous carbon are excellent electrode materials for energy-storage devices
From the X-ray diffraction (XRD) patterns (Fig. 2a), both PTL-based porous carbon microspheres (PPCMs) and Au-PPCM composites had two broadened diffraction peaks at 22° and 43°, corresponding to the (002) and (101) reflection of graphite stacking[26,27,28], indicating that the prepared carbon materials had a certain degree of graphitization
While the other characteristic diffraction peak of Au-PPCM emerged at 38.4°, which was ascribed to the (111) crystal plane of gold[29,30,31], illustrating that gold nanoparticles were successfully decorated on PPCM
Summary
Porous carbon are excellent electrode materials for energy-storage devices. Here, we present a facile in-situ reduction method to improve the electrochemical performance of carbon materials by gold nanoparticles. The electrochemical performance of as-synthesized porous carbon microspheres was exemplified as electrode materials for supercapacitor with a high specific capacitance of 440 F g−1 at a current density of 0.5 A g−1, and excellent cycling stability with a capacitance retention of 100% after 2000 cycles at 10 A g−1 in 6 M KOH electrolyte. Carbon-based materials such as porous carbon, carbon nanotubes, carbon nanofibers, and graphene, are widely studied for supercapacitors application owing to their high specific surface area, excellent chemical stability, and environmental compatibility[9,10,11,12,13]. Fallen PTLs are everywhere in north China in autumn, but most of them are burned, causing resource wastage and exacerbated air pollution It is environment-friendly and sustainable to employ renewable and widespread PTLs as raw materials to prepare PTL-based porous carbon microspheres (PPCMs). The mechanism of gold nanoparticles enhancing electrochemical properties of PPCM was discussed
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