Oxygen-Containing Functional Groups Regulating the Carbon/Electrolyte Interfacial Properties Toward Enhanced K+ Storage

Abstract

Oxygen-containing functional groups were found to effectively boost the K+ storage performance of carbonaceous materials, however, the mechanism behind the performance enhancement remains unclear. Herein, we report higher rate capability and better long-term cycle performance employing oxygen-doped graphite oxide (GO) as the anode material for potassium ion batteries (PIBs), compared to the raw graphite. The in situ Raman spectroscopy elucidates the adsorption-intercalation hybrid K+ storage mechanism, assigning the capacity enhancement to be mainly correlated with reversible K+ adsorption/desorption at the newly introduced oxygen sites. It is unraveled that the C=O and COOH rather than C-O-C and OH groups contribute to the capacity enhancement. Based on in situ Fourier transform infrared (FT-IR) spectra and in situ electrochemical impedance spectroscopy (EIS), it is found that the oxygen-containing functional groups regulate the components of solid electrolyte interphase (SEI), leading to the formation of highly conductive, intact and robust SEI. Through the systematic investigations, we hereby uncover the K+ storage mechanism of GO-based PIB, and establish a clear relationship between the types/contents of oxygen functional groups and the regulated composition of SEI.

Self-assembled carbon nanoribbons with the heteroatom doping used as ultrafast charging cathodes in zinc-ion hybrid supercapacitors

“…3i and Table S2) [16,18,28,[31][32][33][34][35][36][37][38]. We also compared other types of supercapacitors in Table S3, showing that ZHSs possess both high security and competitive electrochemical performance [39][40][41][42][43]. These inspiring results reveal that the CPTHB-B2 electrode exhibits rapid dynamics during the electrochemical process, more active sites for charge storage and high reversibility, which can be ascribed to its ultrathin ribbon structure, high heteroatom doping level, rich defects, relatively large surface area and wide pore size distribution.…”

A Simple Route to Produce Highly Efficient Porous Carbons Recycled from Tea Waste for High-Performance Symmetric Supercapacitor Electrodes

“…The high-resolution N 1s spectrum is deconvoluted into four peaks at 398.8, 399.7, 400.5, and 401.7 eV, are assigned to pyridinic-N (N-6), pyridone-N or pyrrolic-N (N-5), quaternary-N (N-Q), and pyridine N-oxide (N-X) as illustrated in Figure 3 g [ 50 , 51 ]. The O 1s XPS spectrum is fitted into four peaks at approximately 531.3, 532.5, 533.2, and 533.9 eV, corresponding to the oxygen-containing groups C=O, C-O, C-O-C, and O-C=O, respectively, as presented in Figure 3 h [ 17 , 52 ]. The above set of results suggests that TAC3 has various O-containing and N-containing groups on the surface.…”

Fundamental Understanding and Research Progress on the Interfacial Behaviors for Potassium‐Ion Battery Anode

“…Peng et al. [ 51 ] reported graphite oxide with oxygen‐rich functional groups, and they considerably illustrated that the presence of C═O and COOH groups contributes to forming a inorganic component SEI in EC/DEC electrolyte, as confirmed by in situ FTIR analysis. This desirable SEI film endows smaller SEI resistance ( R SEI ), charge transfer resistance ( R ct ), and higher ion diffusion coefficient, thus leading to increased reaction dynamic, as evidenced by EIS measurement results.…”