One‐Step Construction of N,P‐Codoped Porous Carbon Sheets/CoP Hybrids with Enhanced Lithium and Potassium Storage

Abstract

Despite the desirable advancement in synthesizing transition-metal phosphides (TMPs)-based hybrid structures, most methods depend on foreign-template-based multistep procedures for tailoring the specific structure. Herein, a self-template and recrystallization-self-assembly strategy for the one-step synthesis of core-shell-like cobalt phosphide (CoP) nanoparticles embedded into nitrogen and phosphorus codoped porous carbon sheets (CoP⊂NPPCS), is first proposed. Relying on the unusual coordination ability of melamine with metal ions and the cooperative hydrogen bonding of melamine and phytic acid to form a 2D network, a self-synthesized single precursor can be attained. Importantly, this approach can be easily expanded to synthesize other TMPs⊂NPPCS. Due to the unique compositional and structural characteristics, these CoP⊂NPPCSs manifest outstanding electrochemical performances as anode materials for both lithium- and potassium-ion batteries. The unusual hybrid architecture, the high specific surface area, and porous features make the CoP⊂NPPCS attractive for other potential applications, such as supercapacitors and electrocatalysis.

SnS2/N‐Doped Graphene as a Superior Stability Anode for Potassium‐Ion Batteries by Inhibiting “Shuttle Effect”

“…The pyridinic-N and pyrrolic-N introduce numerous active sites and extrinsic defects to graphene, thereby improving the electrochemical performance, consistent with previous results. [12] The Sn 3d spectrum in Figure 2d shows two peaks with binding energy at 487.0 and 495.4 eV, assigned to the Sn 3d 5/2 and Sn 3d 3/2 respectively, confirm the presence of Sn 4 + in this composite. The S 2p spectra of SnS 2 /N-rGO and SnS 2 are shown in Figure S4.…”

Hierarchical Microcables Constructed by CoP@C⊂Carbon Framework Intertwined with Carbon Nanotubes for Efficient Lithium Storage

“…For instance, our group designed one‐step synthesis of core−shell like CoP nanoparticles (NPs) embedded into nitrogen and phosphorus codoped porous carbon sheets (CoP⊂NPPCSs) that delivered a reversible capacity of 631 mAh g −1 after 800 cycles at 0.5 A g −1 . [ 18 ] Jiao et al used metal−organic frameworks as templates to get multiwalled carbon nanotubes (MCNTs) modified porous CoP−carbon composite (CoP−C@MCNTs), retaining a superior reversible capacity of 547.5 mAh g −1 after 200 cycles. [ 19 ] Although these advances have been made, the reversible capacity of the materials and the cycle life at high rate still need to be optimized.…”

Few‐Layered Tin Sulfide Nanosheets Supported on Reduced Graphene Oxide as a High‐Performance Anode for Potassium‐Ion Batteries

“…However, their low specific capacity (around 200 mAh g −1 ) and high average operating voltage (>0.5 V) limit the energy density of PIBs . Very recently, some noncarbonaceous anodes based on conversion/alloying mechanisms have been explored for K storage, exhibiting increased specific capacity compared with the carbonaceous materials . Among them, Sn‐based compounds (e.g., Sn 4 P 3 , SnS 2 ) combining the conversion and alloying reactions are expected to be promising anode candidates due to their high theoretical specific capacities .…”