3 years ago

N- and O-doped hollow carbonaceous spheres with hierarchical porous structure for potential application in high-performance capacitance

N- and O-doped hollow carbonaceous spheres with hierarchical porous structure for potential application in high-performance capacitance
Hollow carbonaceous spheres (HCSs) have been extensively investigated due to their valuable potentials in the applications of energy storage devices such as solar cells, fuel cells, and supercapacitors. It is highly desirable to develop abundant pore structures and introduce heteroatoms in the resultant HCSs to improve capacitance of the devices. Herein, N-, and O-doped HCSs with macro/micro/mesoporous structures are successfully prepared by one-step carbonization of polypyrrole coated polystyrene nanoparticles followed by chemical activation with KOH. The huge specific surface area (up to 935 m2 g−1) and hierarchical porous structures can effectively facilitate the transportation and exchange of ions and electrons. Besides, high heteroatom content (∼30%) are believed to provide pseudocapacitance contributed from the redox faradic reactions of these electrochemically active functional groups. The as-prepared activated HCSs possess a high capacitance of 535 F g−1 at a current density of 0.2 A g−1, and maintains 55% of the highest capacitance even at a current density of 10 A g−1. The newly prepared HCSs thus show great potential as the electrode materials of supercapacitors.

Publisher URL: www.sciencedirect.com/science

DOI: S0378775317309217

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.