Separated Tellurium Nanoparticles Confined in Hollow Polypyrrole for High Performance Li‐Te Cathode

Abstract

An innovative method for the fabrication of separated tellurium nanoparticles inside the hollow polypyrrole (PPy) has been developed. The polypyrrole effectively confines the Te nanoparticles through C−Te and C−Te‐N bonds and improves the conductivity and structural integrity. The unique Te/PPy architecture is proved to achieve good reversible specific capacity of 178.2 mAh g−1 (1112 mAh cm−3) at 100 mA g−1 and high rate capacity (98.4 mAh g−1 at the current density of 1600 mA g−1) when evaluated as cathode for Li−Te batteries.

Amorphous Tellurium‐Embedded Hierarchical Porous Carbon Nanofibers as High‐Rate and Long‐Life Electrodes for Potassium‐Ion Batteries

“…X-ray photoelectron spectroscopy (XPS) result reveals that the surface chemical composition of Te@HPCNFs consists of C, O, N, and Te elements (Figure S7, Supporting Information). The Te3d 5/2 spectrum can be fitted into four peaks (Figure 2d), including TeTe (573.5 eV), TeN (574.5 eV), TeC (575.7 eV) and TeO (576.5 eV), [21,22] and Te 0 is the dominant component. Notably, characteristic peaks corresponding to the hexagonal crystalline of Te do not appear in the XRD pattern of Te@HPCNFs (Figure 2e).…”

Full-Electrochemical Construction of High-Performance Polypyrrole/Tellurium Thermoelectrical Nanocomposites

“…XRD analysis was carried out to study the crystallinity of materials. Figure a shows the XRD patterns of the PPy/Te composite films at different PPy electrodeposition times along with the reference pattern of the crystalline Te (JCPDS 36-1452) displayed as gray vertical lines. − Apparently, both the pure Te film (0 min) and the PPy/Te composite films exhibit similar diffractograms, all of which could be assigned to the hexagonal phase of Te. Among them, several sharp and narrow diffraction peaks located at 2θ = 27.6, 38.3, and 45.8° correspond to the diffraction of the (101), (102) and (003) planes.…”

Low Interfacial Energy Barrier and Improved Thermoelectric Performance in Te-Incorporated Polypyrrole

“…A separate phase of Te was observed in the X-ray diffraction spectra of the Te-incorporated PPy composite. Te can take part in chemical interaction with PPy . This indicates that Te is not included in the PPy matrix.…”

“…Te can take part in chemical interaction with PPy. 45 This indicates that Te is not included in the PPy matrix. Thus, it was interacting with the PPy chains through π−π interaction staying outside the chain.…”