3 years ago

Macroporous Catalytic Carbon Nanotemplates for Sodium Metal Anodes

Macroporous Catalytic Carbon Nanotemplates for Sodium Metal Anodes
Young Soo Yun, Hyoung-Joon Jin, Hyeon Ji Yoon, Na Rae Kim
Because of its remarkably high theoretical capacity and favorable redox voltage (−2.71 V vs the standard hydrogen electrode), Na is a promising anode material for Na ion batteries. In this study, macroporous catalytic carbon nanotemplates (MC-CNTs) based on nanoweb-structured carbon nanofibers with various carbon microstructures are prepared from microbe-derived cellulose via simple heating at 800 or 2400 °C. MC-CNTs prepared at 800 °C have amorphous carbon structures with numerous topological defects, and exhibit a lower voltage overpotential of ≈8 mV in galvanostatic charge/discharge testing. In addition, MC-CNT-800s exhibit high Coulombic efficiencies of 99.4–99.9% during consecutive cycling at current densities ranging from 0.2 to 4 mA cm−2. However, the carbon structures of MC-CNTs prepared at 800 °C are gradually damaged by cycling. This results in significant capacity losses after about 200 cycles. In contrast, MC-CNTs prepared at 2400 °C exhibit well-developed graphitic structures, and maintain predominantly stable cycling behaviors over 1000 cycles with Coulombic efficiencies of ≈99.9%. This study demonstrates the superiority of catalytic carbon nanotemplates with well-defined pore structures and graphitic microstructures for use in Na metal anodes. Macroporous catalytic carbon nanotemplates (MC-CNTs) with different graphitic microstructures are fabricated from microbe-derived cellulose by a simple heating process from 800 to 2400 °C. MC-CNTs exhibit a remarkably small overpotential than Al foil electrode and excellent Coulombic efficiency of 99.9% at 1 mA cm−2 (1 A g−1). However, MC-CNTs show distinct cycling performance depending on graphitization degree.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201701261

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.