Tubular CoFeP@CN as a Mott–Schottky Catalyst with Multiple Adsorption Sites for Robust Lithium−Sulfur Batteries

Abstract

Original measurement data are available upon reasonable request.

A High Conductivity 1D π–d Conjugated Metal–Organic Framework with Efficient Polysulfide Trapping‐Diffusion‐Catalysis in Lithium–Sulfur Batteries

“…This result further suggests that Ni-MOF-1D significantly lowers the energy barrier of the Li 2 S nucleation, accelerating the Li 2 S precipitation kinetics. [49,59] Figure 5a presents the galvanostatic charge/discharge profiles of S@Ni-MOF-1D at different current rates. All discharge curves display two well-defined plateaus, even at the highest current density tested, 8 C. In contrast, S@Super P electrodes showed a high polarization potential and no capacity response at current rates above 3 C (Figure S22a, Supporting Information), due to the large potential barriers and limited conductivity that characterize this electrode material.…”

Enhanced Polysulfide Conversion with Highly Conductive and Electrocatalytic Iodine‐Doped Bismuth Selenide Nanosheets in Lithium–Sulfur Batteries

“…Recently, we and others have demonstrated metal selenides, such as ZnSe, NbSe 2 , and NiCo 2 Se 4 , as promising sulfur hosts in LSB cathodes, owing to their notable polarity, excellent catalytic activity, and high electrical conductivity. [ 3,5,34,42,43 ] However, among the extended family of possible chalcogenides, a particularly interesting candidate has been so far overlooked. Bismuth selenide (Bi 2 Se 3 ) is generally an n‐type degenerated semiconductor, with a low bandgap of 0.3 eV, that is widely used in the field of thermoelectricity due to its high electrical conductivity.…”

“…Bismuth selenide (Bi 2 Se 3 ) is generally an n‐type degenerated semiconductor, with a low bandgap of 0.3 eV, that is widely used in the field of thermoelectricity due to its high electrical conductivity. [ 41,42 ] Its n‐type electronic behavior is related to the presence of Se vacancies that act as electron donors. Bi 2 Se 3 has a layered crystal structure consisting of stacks of covalently bonded quintuple atomic layers, SeBiSeBiSe, that are held together by weak van der Waals interactions.…”

Design of Quasi‐MOF Nanospheres as a Dynamic Electrocatalyst toward Accelerated Sulfur Reduction Reaction for High‐Performance Lithium–Sulfur Batteries

“…[ 7 ] However, most metal oxides are greatly hindered in their further application due to their poor electron/ion transfer and low catalytic activity. To further enhance the Li–S kinetics on metal oxides sulfur immobilizer, many structure design strategies, such as sulfurization, [ 8 ] nitridation, [ 9 ] phosphidation, [ 10 ] telluridation, [ 11 ] and heterostructure construction [ 12 ] have been employed to develop sulfur electrocatalyst for enhanced catalytic conversion of LiPs. However, these methods involve complicated procedures to modify metal oxides and the as‐developed catalysts usually demonstrate unsatisfied durability, which tends to react with LiPs or aggregate over the course of electrochemical process, which significantly reduce the catalytic activity of active sites, rendering sluggish redox reactions.…”

“…[ 19 ] Importantly, the evolution of active sites is often ignored, and limited efforts have been placed to identify the chemical environment of active sites during cycling. [ 20 ] Although the potentiodynamic‐driven linear scanning voltammetry (LSV) techniques have been applied in sulfur oxidation reaction measurements, [ 12b,21 ] it is inevitably different from the continuous galvanostatic technique in the cycling process since the LiPs concentration in the electrolyte varies during discharge process and it is far more concentrated than that in standard three‐electrode LSV measurement. Therefore, understanding the evolution of active configuration for sulfur electrocatalyst and revealing the underlying mechanism are highly demanded, which can enlighten the active sites engineering of cathode material to create multiple high‐efficiency and durable active sites to realize long‐lasting Li–S electrocatalysis.…”