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Facile Fabrication of Ag Nanocrystals Encapsulated in Nitrogen-doped Fibrous Carbon as an Efficient Catalyst for Lithium Oxygen Batteries

Journal Article


Abstract


  • A facile synthesis of Ag nanocrystals encapsulated in nitrogen-doped carbon fiber (NCF) is proposed, based on the simultaneous reaction between pyrrole and Ag+ ions in an aqueous solvent followed by a heat treatment. The as-prepared Ag/NCF demonstrated superior catalytic behavior toward ORR and OER. Besides improved cycling stability, a much lower discharge/charge gap of 0.89 V (vs Li/Li+) compared with 1.38 V for NCF cathode with a fixed capacity of 500 mAh g−1 was obtained in lithium oxygen batteries. The introduction of Ag crystals into NCF facilitates the oxygen reduction reaction/oxygen evolution reaction kinetics. X-ray diffraction analysis coupled with Raman spectroscopy confirmed that Ag/NCF cathode could reversibly catalyze Li2O2 formation and decomposition. The NCF matrix offers a conductive network to realize rapid mass transfer and the encapsulated Ag nanocrystals supplied effective catalytic active sites. The combined action between both contributes to the superior electrocatalytic performance.

Publication Date


  • 2021

Citation


  • Liu, L., Ma, T., Fang, W., Liu, Y., Konstantinov, K., Wang, J., & Liu, H. K. (2021). Facile Fabrication of Ag Nanocrystals Encapsulated in Nitrogen-doped Fibrous Carbon as an Efficient Catalyst for Lithium Oxygen Batteries. Energy and Environmental Materials, 4(2), 239-245. doi:10.1002/eem2.12177

Scopus Eid


  • 2-s2.0-85102247231

Start Page


  • 239

End Page


  • 245

Volume


  • 4

Issue


  • 2

Abstract


  • A facile synthesis of Ag nanocrystals encapsulated in nitrogen-doped carbon fiber (NCF) is proposed, based on the simultaneous reaction between pyrrole and Ag+ ions in an aqueous solvent followed by a heat treatment. The as-prepared Ag/NCF demonstrated superior catalytic behavior toward ORR and OER. Besides improved cycling stability, a much lower discharge/charge gap of 0.89 V (vs Li/Li+) compared with 1.38 V for NCF cathode with a fixed capacity of 500 mAh g−1 was obtained in lithium oxygen batteries. The introduction of Ag crystals into NCF facilitates the oxygen reduction reaction/oxygen evolution reaction kinetics. X-ray diffraction analysis coupled with Raman spectroscopy confirmed that Ag/NCF cathode could reversibly catalyze Li2O2 formation and decomposition. The NCF matrix offers a conductive network to realize rapid mass transfer and the encapsulated Ag nanocrystals supplied effective catalytic active sites. The combined action between both contributes to the superior electrocatalytic performance.

Publication Date


  • 2021

Citation


  • Liu, L., Ma, T., Fang, W., Liu, Y., Konstantinov, K., Wang, J., & Liu, H. K. (2021). Facile Fabrication of Ag Nanocrystals Encapsulated in Nitrogen-doped Fibrous Carbon as an Efficient Catalyst for Lithium Oxygen Batteries. Energy and Environmental Materials, 4(2), 239-245. doi:10.1002/eem2.12177

Scopus Eid


  • 2-s2.0-85102247231

Start Page


  • 239

End Page


  • 245

Volume


  • 4

Issue


  • 2