4.8 Article

Enhanced oxygen reduction reaction for Zn-air battery at defective carbon fibers derived from seaweed polysaccharide

期刊

APPLIED CATALYSIS B-ENVIRONMENTAL
卷 301, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.apcatb.2021.120785

关键词

Seaweed polysaccharide; Defective carbon fiber; Oxygen reduction reaction; Zinc-air batteries

资金

  1. National Natural Science Foundation of China [21501105, 51808303]
  2. Applied Basic Research of Qingdao City [19-6-2-74-cg]
  3. Taishan Scholar Foundation [ts201712030]
  4. Outstanding Youth of Natural Science in Shandong Province [JQ201713]
  5. State Key Laboratory of Bio-Fibers and Eco-Textiles (Qingdao University) [ZKT25, ZKT30]

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Carbon fibers with intrinsic defects (D-CFs) synthesized from seaweed polysaccharide show excellent ORR catalytic activity, making them a promising alternative to Pt/C catalyst for large-scale application in zinc-air batteries.
Carbon fibers with intrinsic carbon defects (D-CFs) were fabricated through heteroatoms doping and de-doping using seaweed polysaccharide as the precursor. When evaluated as oxygen reduction reaction (ORR) electro-catalyst, D-CFs display an initial potential of 0.92 V (vs. RHE) and a limiting diffusion current density of 5.38 mA.cm(-2) in KOH electrolyte (0.1 M). The high peak power density of zinc-air batteries (ZABs) assembled by D-CFs is 238 mW.cm(-2), that is much better than commercial Pt/C (154 mW.cm(-2)). In the light of density functional theory (DFT) results, enriched electrons in defects make the hybridization energy levels of active defective sites and adsorbed oxygen atoms rise to Fermi level, indicating that O-2 molecules are inclined to be adsorbed onto defective carbon atoms. Therefore, abundant renewable seaweed sources, together with the excellent ORR catalytic activity, make D-CFs as the substitute of Pt/C catalyst for large-scale application of ZABs.

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