Pore and Heteroatom Engineered Carbon Foams for Supercapacitors. Issue 19 (28th March 2019)

• Record Type: Journal Article
• Authors: Peng, Huarong; Yao, Bin; Wei, Xijun; Liu, Tianyu; Kou, Tianyi; Xiao, Peng; Zhang, Yunhuai; Li, Yat
• Is Part Of: Advanced energy materials. Volume 9:Issue 19(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-03-28
• Subjects: heteroatom doping -- mesoporous channels -- multiscale pores -- pore‐engineering -- supercapacitors; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201803665
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Carbonaceous materials are attractive supercapacitor electrode materials due to their high electronic conductivity, large specific surface area, and low cost. Here, a unique hierarchical porous N, O, S‐enriched carbon foam (KNOSC) with high level of structural complexity for supercapacitors is reported. It is fabricated via a combination of a soft‐template method, freeze‐drying, and chemical etching. The carbon foam is a macroporous structure containing a network of mesoporous channels filled with micropores. It has an extremely large specific surface area of 2685 m 2 g −1 . The pore engineered carbon structure is also uniformly doped with N, O, and S. The KNOSC electrode achieves an outstanding capacitance of 402.5 F g −1 at 1 A g −1 and superior rate capability of 308.5 F g −1 at 100 A g −1 . The KNOSC exhibits a Bode frequency at the phase angle of −45° of 18.5 Hz, which corresponds to a time constant of 0.054 s only. A symmetric supercapacitor device using KNOSC as electrodes can be charged/discharged within 1.52 s to deliver a specific energy density of 15.2 W h kg −1 at a power density of 36 kW kg −1 . These results suggest that the pore and heteroatom engineered structures are promising electrode materials for ultrafast charging. Abstract : The integration of a tri‐doping and pore engineering method to prepare a unique hierarchical macroporous structure for ultrafast supercapacitors is demonstrated. This N, O, S tri‐doped structure offers an ultrahigh specific surface area and a network of multiple scale channels helping to improve capacitance performance of carbon structures including electric double layer capacitance, pseudocapacitance, and rate capability.