Monodispersed Ruthenium Nanoparticles on Nitrogen-Doped Reduced Graphene Oxide for an Efficient Lithium–Oxygen Battery

Abstract

Lithium–oxygen batteries with ultrahigh energy densities have drawn considerable attention as next-generation energy storage devices. However, their practical applications are challenged by sluggish reaction kinetics aimed at the formation/decomposition of discharge products on battery cathodes. Developing effective catalysts and understanding the fundamental catalytic mechanism are vital to improve the electrochemical performance of lithium–oxygen batteries. Here, uniformly dispersed ruthenium nanoparticles anchored on nitrogen-doped reduced graphene oxide are prepared by using an in situ pyrolysis procedure as a bifunctional catalyst for lithium–oxygen batteries. The abundance of ruthenium active sites and strong ruthenium–support interaction enable a feasible discharge product formation/decomposition route by modulating the surface adsorption of lithium superoxide intermediates and the nucleation and growth of lithium peroxide species. Benefiting from these merits, the electrode provides a drastically increased discharge capacity (17,074 mA h g–1), a decreased charge overpotential (0.51 V), and a long-term cyclability (100 cycles at 100 mA g–1). Our observations reveal the significance of the dispersion and coordination of metal catalysts, shedding light on the rational design of efficient catalysts for future lithium–oxygen batteries.

Crown Ether Electrolyte Induced Li2O2 Amorphization for Low Polarization and Long Lifespan Li‐O2 Batteries

“…The Li 1s XPS spectra collected from the discharged cathode also show the peak of Li 2 O 2 at 54.8 eV. [24] Furthermore, DEMS and XPS spectra of the G4based electrolyte also confirmed the generation of Li 2 O 2 . These results demonstrate that the main discharge products in both C15-and G4-based electrolytes are mainly Li 2 O 2 , with only difference in crystallinity.…”

Facet-controlled bifunctional WO3photocathodes for high-performance photo-assisted Li–O2batteries

“…S13b, ESI †). 34 The calculation results illustrate that the O 2 À adsorption efficiencies on WO 3 exhibit the following sequence: 1-WO 3 nanoplate (26%) o 2-WO 3 nanorod (41%) o 3-WO 3 nanosheet (52%). Accordingly, as predicted in Fig.…”

Tailored Plasmonic Ru/OV-MoO2 on TiO2 Catalysts via Solid-Phase Interface Engineering: Toward Highly Efficient Photoassisted Li–O2 Batteries with Enhanced Cycling Reliability

“…This barrier filters to force the energetic electrons or holes to migrate across the interface while inhibiting their reverse movement, leading to effective electron–hole separation-suppressed charge–carrier recombination . In addition, Ru nanoparticles can promote O 2 /Li 2 O 2 redox reactions due to the moderate binding energy between Ru nanoparticles and LiO 2 intermediates and promote the formation and decomposition of Li 2 O 2 . − The generated O V further enhances the migration of electrons and Li + to improve the ORR performance. − Thus, this work provides a general platform for preparing catalysts with high total activity for photoassisted Li–O 2 batteries.…”