CNT@Ni@Ni–Co silicate core–shell nanocomposite: a synergistic triple-coaxial catalyst for enhancing catalytic activity and controlling side products for Li–O₂ batteries

Abstract

The CNT@Ni@Ni–Co silicate core–shell composites prevent the formation of side-products via structural synergistic effects, thereby enhancing its electrochemical performances for Li–O2 batteries.

Ultrathin Ni Co -silicate nanosheets natively anchored on CNTs films for flexible lithium ion batteries

“…Co 2p 3/2 peaks at 780.3 eV represent Co silicates (Fig. 3c) [46], which usually exhibit the high intensity of shake-up satellite peaks [33]. The Ni 2p spectrum can be deconvoluted into two components, including the shake-up satellites and two spin-orbit doublets (Fig.…”

“…3d). The peaks at 857.3 and 875.5 eV correspond to the Ni + species, while the ones at 862.0 and 880.7 eV correspond to Ni 2+ and partially oxidized nickel in Ni 3 S 2 O 5 (OH) 4 [28,33]. Ni 2p 3/2 peaks at 857.3 eV can be attributed to Ni silicates with different oxidation states as a result of the interaction with CNTs [28,33].…”

“…In recent years, metal silicate nanomaterials have received extensive attention due to their high capacity, good rate capability, high safety, and abundant reserves on the earth [28][29][30][31][32][33][34]. These materials typically have a layered silicate structure, providing a large interlayer space for the transportation and storage of lithium ions, which ensures the high utilization of the active species during LIB operations.…”

“…Besides, the shape and size of the electrode material are also important factors affecting the final electrochemical performance [39]. As for providing more redox couples for higher capacity of Li ion storage, introducing a secondary metal species to the silicate system can have been proven an effective solution, which may enhance the intrinsic electronic conductivity of the silicate material as well [33,35]. Apart from this, the design of highperformance electrode materials, an efficient interconnected 3D network is often necessary.…”

Ni–Co bimetallic coordination effect for long lifetime rechargeable Zn–air battery

“…Therefore, developing low-cost and efficient bifunctional catalysts as a substitute for precious metals has been the focus of related research [2] . Transition metals have, because of the 3d unoccupied orbitals that can accommodate foreign electrons to reduce bond strength between the OOH * /OH * intermediates, the potential for the catalytic reaction process [13] . However, there is no single kind of active center that provides the highest catalytic activity for the ORR and OER at the same time.…”