TY - JOUR
T1 - A novel eutectic solvent precursor for efficiently preparing N-doped hierarchically porous carbon nanosheets with unique surface functional groups and micropores towards dual-carbon lithium-ion capacitors
AU - Zou, Kaixiang
AU - Deng, Yuanfu
AU - Wu, Weijing
AU - Zhang, Shiwei
AU - Chen, Guohua
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China, China (Grant No. 21875071), the Guangdong Key R&D Program of China (Grant No. 2019B090908001) and the NSFC/RGC Joint Research Scheme (Grant No. 21661162002 and N_HKUST601/16).
Publisher Copyright:
© The Royal Society of Chemistry 2021.
PY - 2021/6/21
Y1 - 2021/6/21
N2 - High performance carbon-based materials are ideal electrode materials for Li-ion capacitors (LICs) but there are still many challenges such as the complicated preparation processes, high cost, and low yield. Also, the intrinsic structure and surface functionalities need to be optimized. This paper designs a novel route for the facile, low cost, and high efficiency fabrication of N-doped hierarchically porous carbon nanosheets (NPCSs). The NPCSs are achieved from the direct pyrolysis of a homogeneous low temperature eutectic solvent containing sugar as the carbon source and a eutectic salt with ferric chloride as the activation agent and the nitrogen source. It is indicated that the application of moderate ferric chloride additive during the activation process plays key roles, which not only facilitates the formation of a highly distributed layered structure but also optimizes the proportion of the micropores and surface functional groups of the final NPCSs. Specifically, the as-obtained NPCS-1 sample, with appropriate proportion of N- and O-containing surface groups as well as micropores, exhibits an excellent electrochemical performance as both cathode and anode materials for an LIC, with specific discharge capacities of ∼62.1 and 331 mA h g−1at a current density of 5 A g−1, respectively. Furthermore, the resultant NPCS-1//NPCS-1 LIC device can deliver a high energy density of 135.6 W h kg−1at 500 W kg−1, with a capacity retention of 82% after 10 000 cycles at 2 A g−1
AB - High performance carbon-based materials are ideal electrode materials for Li-ion capacitors (LICs) but there are still many challenges such as the complicated preparation processes, high cost, and low yield. Also, the intrinsic structure and surface functionalities need to be optimized. This paper designs a novel route for the facile, low cost, and high efficiency fabrication of N-doped hierarchically porous carbon nanosheets (NPCSs). The NPCSs are achieved from the direct pyrolysis of a homogeneous low temperature eutectic solvent containing sugar as the carbon source and a eutectic salt with ferric chloride as the activation agent and the nitrogen source. It is indicated that the application of moderate ferric chloride additive during the activation process plays key roles, which not only facilitates the formation of a highly distributed layered structure but also optimizes the proportion of the micropores and surface functional groups of the final NPCSs. Specifically, the as-obtained NPCS-1 sample, with appropriate proportion of N- and O-containing surface groups as well as micropores, exhibits an excellent electrochemical performance as both cathode and anode materials for an LIC, with specific discharge capacities of ∼62.1 and 331 mA h g−1at a current density of 5 A g−1, respectively. Furthermore, the resultant NPCS-1//NPCS-1 LIC device can deliver a high energy density of 135.6 W h kg−1at 500 W kg−1, with a capacity retention of 82% after 10 000 cycles at 2 A g−1
UR - http://www.scopus.com/inward/record.url?scp=85107944011&partnerID=8YFLogxK
U2 - 10.1039/d1ta03071j
DO - 10.1039/d1ta03071j
M3 - Journal article
AN - SCOPUS:85107944011
SN - 2050-7488
VL - 9
SP - 13631
EP - 13641
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 23
ER -