Water‐Induced Growth of a Highly Oriented Mesoporous Graphitic Carbon Nanospring for Fast Potassium‐Ion Adsorption/Intercalation Storage. Issue 50 (24th October 2019)

• Record Type: Journal Article
• Authors: Qian, Yong; Jiang, Song; Li, Yang; Yi, Zheng; Zhou, Jie; Tian, Jie; Lin, Ning; Qian, Yitai
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 50(2019)
• Page Start: 18108
• Page End: 18115
• Publication Date: 2019-10-24
• Subjects: graphitic carbon nanospring -- long-term stability -- mesoporous materials -- potassium-ion batteries -- ultra-high capacity; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201912287
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: A highly oriented mesoporous graphitic carbon nanospring (OGCS) with graphitic layers that are perpendicular to the axis is prepared by hydrothermal treatment of epoxy resin at 500 °C and annealing at 1400 °C. Water plays an important role in not only forming the graphitic carbon nanospring with a high [002] orientation and a large amount of active edge‐plane sites, but also in the generation of the mesoporous structure, which facilitate fast K‐ion adsorption and diffusion. In situ and ex situ measurements confirm that OGCS undergoes K‐adsorption in mesopores and then K‐intercalation in the graphite layer to form KC8 with a low discharge voltage. The spring‐like nanostructure can expand one‐dimensionally along the axial direction to accommodate the volume variation. The OGCS electrode thus shows a much better K‐storage performance than that of unoriented graphitic carbon. Abstract : Spring loaded : A spring‐like highly oriented mesoporous graphitic carbon anode (OGCS) undergoes K‐adsorption in mesopores then K‐intercalation in the graphite layer to form KC8 with a low discharge voltage. It provides a large number of active edge‐plane sites and expands one‐dimensionally along the long axis, resulting in ultra‐high capacity and long‐term stability over 10 000 cycles.