Co-reporter:Bo You, Fei Kang, Peiqun Yin, Qian Zhang
Carbon 2016 Volume 103() pp:9-15
Publication Date(Web):July 2016
DOI:10.1016/j.carbon.2016.03.009
Novel boron and nitrogen co-doped hierarchically porous carbon networks were prepared through a green, simple, and innovative template-free pyrolysis of agarose hydrogel containing TBE buffer (Tris base, boric acid and ethylenediaminetetraacetic acid) followed by chemical activation (KOH). The resulting materials with 3D interconnected hierarchically pore structure, high specific surface area of 2666 m2 g−1 and moderate heteroatoms contents exhibit a high specific capacitance of 214 F g−1 at 0.2 A g−1 in 6 M KOH electrolyte and excellent electrocatalytic oxygen reduction activity comparable to and methanol tolerance better than those of commercial 20 wt% Pt/C catalysts in O2-saturated 0.1 M KOH solution.
Co-reporter:Junli Zhang, Gaoli Chen, Qian Zhang, Fei Kang, and Bo You
ACS Applied Materials & Interfaces 2015 Volume 7(Issue 23) pp:12760
Publication Date(Web):May 29, 2015
DOI:10.1021/acsami.5b01660
The rational design of high-performance and cheap nanomaterials for multiple sustainable energy storage applications is extremely urgent but remains challenging. Herein, a facile commercial melamine-sponge-directed multicomponent surface self-assembly strategy has been reported to synthesize N-doped carbon aerogels (NCAs) with low density (0.01 g cm–3), large open pores, and high surface area (1626 m2 g–1). The commercial melamine sponge simultaneously serves as a green N source for N-doping and a 3D scaffold to buffer electrolytes for reducing ion transport resistance and minimizing ion diffusion distance. With their tailored architecture characteristics, the NCAs-based supercapacitor and oxygen reduction electrocatalyst show excellent performance.Keywords: carbon aerogels; electrocatalysis; nitrogen doping; oxygen reduction; supercapacitor;
Co-reporter:Bo You, Jinhui Jiang, and Sanjun Fan
ACS Applied Materials & Interfaces 2014 Volume 6(Issue 17) pp:15302
Publication Date(Web):August 13, 2014
DOI:10.1021/am503783t
Three-dimensional hierarchically porous carbon-CNT-graphene ternary all-carbon foams (3D-HPCFs) with 3D macro- and mesoporous structures, a high specific surface area (1286 m2 g–1), large bimodal mesopores (5.1 and 2.7 nm), and excellent conductivity have been fabricated through multicomponent surface self-assembly of graphene oxide (GO)-dispersed pristine CNTs (GOCs) supported on a commercial sponge. The commercial sponge with a 3D interconnected macroporous framework not only is used as a support for GOCs and subsequently multicomponent self-assembly but also serves as a 3D scaffold to buffer electrolytes to reduce ion transport resistance and ion diffusion distance, while the GO acts as “surfactant” to directly disperse pristine CNTs, preserving the excellent electronic structure of pristine CNTs, and the CNTs also prevent the aggregation of graphene as well as improve the whole conductivity. Benefiting from the aforementioned characteristics, the 3D-HPCFs-based supercapacitors show outstanding specific capacitance, high rate capability, and excellent cycling stability, making them potentially promising for high-performance energy storage devices.Keywords: CNTs; graphene; porous; supercapacitor
Co-reporter:Dr. Bo You;Lili Wang; Na Li;Chaolun Zheng
ChemElectroChem 2014 Volume 1( Issue 4) pp:772-778
Publication Date(Web):
DOI:10.1002/celc.201300241
Abstract
Graphene-based energy storage devices, such as supercapacitors and lithium ion batteries have triggered substantial research interests due to the remarkable physical and chemical properties. However, the restacking due to intensive π–π interactions dramatically decreases the specific surface area, leading to the poor energy storage performance. In addition, the electrical conductivity of commonly reduced graphene oxide (G) is several orders of magnitude lower than pristine graphene due to the incomplete reduction and the presence of numerous defects. Here, we report a doubl enhanced strategy to improve the energy storage performance of G through pristine CNTs directly dispersed by GO and subsequent multicomponent surface self-assembly coating of ordered mesoporous carbon. The resulted graphene–CNT ordered mesoporous carbon ternary hybrids (GCMCs) possess an ordered, interconnected mesostructure, a high specific surface area of 1411 m2 g−1, large mesopores of 4.3 nm, and good conductivity. With their tailored architecture, the GCMCs-based supercapacitor shows high specific capacitance (2.4–16.5 times higher than G) and excellent cycle along with 100 % capacitance after 1000 cycles. Additionally, lithium ion battery anodes made of these GCMCs have exhibited a high reversible capacity of 903 mAh g−1 at 0.1 A g−1 after 100 cycles, which is 3.9 times higher than that of G.
