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Unraveling the catalytic activities of ruthenium nanocrystals in high performance aprotic Li¿O2 batteries

Journal Article


Abstract


  • Ruthenium (Ru)-catalyzed aprotic Li–O2 batteries have attracted a great deal of interests because of their excellent electrochemical performances including high specific energy and round-trip efficiency. However, it remains unclear how the incorporated Ru catalysts function to enhance the batteries’ performance. Herein, we report Ru nanocrystal-catalyzed carbon nanotube-based aprotic Li–O2 batteries with electrochemical performances that can match or even surpass some of the best literature results. The catalytic mechanism of Ru nanocrystals has been studied by a combination of Coulometry and in situ differential electrochemical mass spectrometry (DEMS). It has been found that through the synergy of water additive in electrolyte and Ru-based catalysts, the charging reaction overpotential can be brought down to 0.12 V (usually η>1 V). Moreover, an isotope-labeled DEMS study on the electrochemical oxidation of Li213CO3 indicated that Ru nanocrystals also have the capability to decompose Li2CO3, a detrimental by-product formed in almost all aprotic Li–O2 batteries, at a surprisingly low potential of ~3.5 V vs. Li/Li+ (usually >4.0 V). The capabilities of Ru nanocrystals to decompose Li2O2, LiOH, and Li2CO3 at low voltages, which drastically decreases the degradation of electrode and/or electrolyte, are crucial to achieve outstanding electrochemical performances for Li–O2 batteries.

UOW Authors


  •   Wang, Guoxiu (external author)

Publication Date


  • 2016

Citation


  • Sun, B., Guo, L., Ju, Y., Munroe, P., Wang, E., Peng, Z., & Wang, G. (2016). Unraveling the catalytic activities of ruthenium nanocrystals in high performance aprotic Li¿O2 batteries. Nano Energy, 28, 486-494. doi:10.1016/j.nanoen.2016.08.057

Scopus Eid


  • 2-s2.0-84987941978

Start Page


  • 486

End Page


  • 494

Volume


  • 28

Abstract


  • Ruthenium (Ru)-catalyzed aprotic Li–O2 batteries have attracted a great deal of interests because of their excellent electrochemical performances including high specific energy and round-trip efficiency. However, it remains unclear how the incorporated Ru catalysts function to enhance the batteries’ performance. Herein, we report Ru nanocrystal-catalyzed carbon nanotube-based aprotic Li–O2 batteries with electrochemical performances that can match or even surpass some of the best literature results. The catalytic mechanism of Ru nanocrystals has been studied by a combination of Coulometry and in situ differential electrochemical mass spectrometry (DEMS). It has been found that through the synergy of water additive in electrolyte and Ru-based catalysts, the charging reaction overpotential can be brought down to 0.12 V (usually η>1 V). Moreover, an isotope-labeled DEMS study on the electrochemical oxidation of Li213CO3 indicated that Ru nanocrystals also have the capability to decompose Li2CO3, a detrimental by-product formed in almost all aprotic Li–O2 batteries, at a surprisingly low potential of ~3.5 V vs. Li/Li+ (usually >4.0 V). The capabilities of Ru nanocrystals to decompose Li2O2, LiOH, and Li2CO3 at low voltages, which drastically decreases the degradation of electrode and/or electrolyte, are crucial to achieve outstanding electrochemical performances for Li–O2 batteries.

UOW Authors


  •   Wang, Guoxiu (external author)

Publication Date


  • 2016

Citation


  • Sun, B., Guo, L., Ju, Y., Munroe, P., Wang, E., Peng, Z., & Wang, G. (2016). Unraveling the catalytic activities of ruthenium nanocrystals in high performance aprotic Li¿O2 batteries. Nano Energy, 28, 486-494. doi:10.1016/j.nanoen.2016.08.057

Scopus Eid


  • 2-s2.0-84987941978

Start Page


  • 486

End Page


  • 494

Volume


  • 28