Improved electrochemical performance of Na_0.67MnO₂ through Ni and Mg substitution

Abstract

Improved electrochemical performance of Na0.67MnO2 through Ni and Mg substitution.

Selective Hydrodeoxygenation of Alkyl Lactates to Alkyl Propionates with Fe‐based Bimetallic Supported Catalysts

“…The share of Fe 3+ was calculated using the relative areas of the Fe 2p 3/2 (III) and Fe 2p 3/2 (II) peaks. Likewise, Ni oxidation states were obtained by deconvoluting the Ni 2p 3/2 signals using four peaks representing Ni 2+ , Ni 3+ , and their respective shake‐up peaks …”

Recent Progress of Layered Transition Metal Oxide Cathodes for Sodium‐Ion Batteries

“…The first one is to limit the high cutoff voltage to avoid the occurrence of phase change at high voltage, nevertheless it may result in insufficient specific capacity . The second strategy is to introduce different transition metals, such as Fe, into the structure to improve the cycling stability by suppressing the Na + ordering process, or electrochemically inactive elements, such as Mg, Al, or Zn, to delay structural transitions at higher voltages . The addition of different metals has different impacts.…”

“…cycling stability by suppressing the Na + ordering process, or electrochemically inactive elements, such as Mg, Al, or Zn, to delay structural transitions at higher voltages. [31,[43][44][45][46][47] The addition of different metals has different impacts. For Fe/Mn based materials, although the Fe 3+ /Fe 4+ redox pairs can provide strong electrostatic repulsion and Mn is essential since its multielectron transfer process grantees the desirable specific capacity, the problems of Fe migration, Jahn-Teller effect and Mn dissolution, etc.…”

Nanowire of WP as a High‐Performance Anode Material for Sodium‐Ion Batteries

“…As shown in Figure c, in the first cycle, the cell shows a larger diameter of semicircles, corresponding to a larger charge transfer resistance compared with the 20th and 100th cycles. The equivalent circuit is illustrated in the inset of Figure c . The semicircles decreased owing to the lattice expansion and surface activation, which improves the kinetics of charge transfer.…”

“…The equivalent circuit is illustrated in the inset of Figure 4c. [45] The semicircles decreased owing to the lattice expansion and surface activation, [46,47] which improves the kinetics of charget ransfer.T he semicircles of the WP/CC materiala fter 20 and 100 cycles overlap well, furtheri ndicating its good stability.F or comparison, WP powder prepared under the same conditions was also subjected to EIS (FigureS9, SupportingI nformation). Clearly,t he cycling stabilitya nd specific capacity of the WP/CCw as higher than its WP powder,m ainly because of the nanowiren anostructure, which acted as ab uffer space.T he obtained R ele and R ct values are listed in Ta blesS1a nd S2 (Supporting Information).…”