Biomass Derived Nitrogen-Doped Highly Porous Carbon Material with a Hierarchical Porous Structure for High-Performance Lithium/Sulfur Batteries

Abstract

A novel nitrogen doped mesoporous carbon (NMPC) with a hierarchical porous structure is prepared by simple carbonizing the green algae, which is applied as a host material to encapsulate sulfur for lithium/sulfur (Li/S) battery. The NMPC exhibits high pore volume as well as large specific surface area, and thus sulfur content in the S/NMPC composite reaches up to 63 wt %. When tested in a Li/S battery, the S/NMPC composite yields a high initial capacity of 1327 mAh·g−1 as well as 757 mAh·g−1 after 100 cycles at a current rate of 0.1 C, a reversible capacity of 642 was achieved even at 1 C. This good electrochemical performance of the S/NMPC composite could be attributed to a unique combination of mesopority and surface chemistry, allowing for the retention of the intermediate polysuflides within the carbon framework.

Synthesis of crosslinked PEG/IL blend membrane via one‐pot thiol–ene/epoxy chemistry

“…The reactive thiol (2570 cm −1 for S─H) and acrylate groups (1630 cm −1 for C═C, 1410 and 830 cm −1 for H─C═) are clear in the spectra of crosslinker and PEGDA, respectively, but all of them disappear in the spectra of the resultant membranes. After the reaction, the peaks assigned to C─S bond shifts to the right side (1144–1100 cm −1 ), which is in agreement to the literature . In addition, the other peak of PEGDA at around 850 cm −1 becomes boarder and bigger in the resulted membranes, which may be overlapped with the peak related with the newly formed C─S bond .…”

One‐Pot Synthesis of Sulfur and Nitrogen Co‐Functionalized Graphene Material using Deep Eutectic Solvents for Supercapacitors

“…The peaks observed in the range 2855-2961 cm À1 are mainly for CÀHb ond stretching. [51,52] The peaks at around 949 cm À1 are attributedt ov ibration of rings containing CÀSb onds. The peaks at 1451, 1360, and 1226 cm À1 are attributed to alkane CÀHb ending, andt hat at 1260 cm À1 to amine CÀNs tretching.…”

“…[51] The FTIR spectrum of SN-rGO showed peaks at 625, 770,a nd 1110cm À1 ,c orresponding to CÀSs tretching. [51,52] The peaks at around 949 cm À1 are attributedt ov ibration of rings containing CÀSb onds. [51] The FTIR spectrump roves that pristine GO sheets are effectively reduced to SN-rGO as wella sf unctionalized by sulfur and nitrogen.…”

Improved specific capacity of sulfur/starch‐based activated carbon spheres composites by polyaniline‐based carbon encapsulation strategy

“…Most recently, biomass‐derived carbon materials have been developed as hosts of sulfur because of their low‐cost, environment‐friendly, and renewable property. Hierarchical porous structure and high surface area can be obtained from these biomass‐derived materials, including poplar catkin, walnut shell, coconut shell, soybean hulls, mangosteen peel, green algae, waste rapeseed shells, and banana peel, among others. After loading sulfur, these sulfur/biomass‐derived carbon composites exhibit improved capacities and cyclic performance.…”