Single-source-precursor synthesis and phase evolution of NbC–SiC–C ceramic nanocomposites with core−shell structured NbC@C and SiC@C nanoparticles

Si-based polymer-derived ceramics for energy conversion and storage

“…It has been widely reported that the chemical and phase composition as well as microstructure of the PDCs are strongly determined by the molecular structure of the preceramic polymer [41][42][43][44][45][46][47]. The molecular structure design and polymer-to-ceramic transformation enable facile fabrication of Si-based ternary (e.g., SiOC [48][49][50][51][52], SiCN [53][54][55][56][57], SiHfC [12], SiTaC [58]), quaternary (e.g., SiCNO [59][60][61][62], SiBCO [63][64][65], SiAlCO [66][67][68][69], SiAlCN [70][71][72][73], SiBCN [31,[74][75][76][77],…”

Kill Two Birds with One Stone: Multifunctional Porous SiOC–Fe2O3 Composite for Li Ion Energy Conversion and Electromagnetic Wave Absorption

“…It can be seen that both can show D and G peaks belonging to carbon near 1350 and 1590 cm –1 . , The ratios ( I D / I G ) between the D peaks and the G peaks of SiOC-Fe_2 and SiOC-Fe_3 are 0.594 and 0.724, respectively. The proportion of Fe source increases, and the value of sample I D / I G also increases, indicating that the crystallinity of the free carbon of the sample decreases with the increase of the Fe source ratio . This is because with the increase of Fe content, the particle size of ceramic nanoparticles increases and the specific surface area decreases, resulting in a decrease in catalytic efficiency and thus a decrease in the degree of crystallization of carbon.…”

“…29-1129), because the iron-containing sol was O-rich, and PCS was decomposed during pyrolysis to generate SiOC, which was further transferred to SiC with the continuous temperature increase during the pyrolysis process. 36 In addition, the C generated from pitch underwent a carbothermal reduction reaction with SiOC, thereby converting into SiC. The main difference was concentrated in the Fe 2 O 3 and Fe 3 Si diffraction peak.…”

“…The proportion of Fe source increases, and the value of sample I D /I G also increases, indicating that the crystallinity of the free carbon of the sample decreases with the increase of the Fe source ratio. 36 This is because with the increase of Fe content, the particle size of ceramic nanoparticles increases and the specific surface area decreases, resulting in a decrease in catalytic efficiency and thus a decrease in the degree of crystallization of carbon. In addition, the peaks appearing in the range of 150−350 cm −1 belong to the Raman diffraction peaks of Fe 2 O 3 , 30 and the peak intensity in this range can be seen to decrease significantly with the increase of the ratio; this result is consistent with the conclusions obtained from previous XRD and TEM analyses.…”

Coupling core–shell Bi@Void@TiO2 heterostructures into carbon nanofibers for achieving fast potassium storage and long cycling stability

“…Besides, nanostructure engineering by constructing a coreshell structure is another effective strategy to accommodate volume changes in electrodes for achieving ultra-long cycling stability. 45,46 An excellent design of the core-shell structure requires the development and utilization of a stable shell. As far as we know, titanium dioxide (TiO 2 ) is a feasible candidate due to the small volume expansion during the (de)potassiation process.…”