Peilong Ji, Li Liu, Qiang Liu, Bingke Li, Shanhao He, Keliang Wu, Xuejun Dong, Zhiyong Liu, Yanlong Tai
{"title":"通过锌粉还原制备富氧三维分层多孔 MXene,用于柔性超级电容器","authors":"Peilong Ji, Li Liu, Qiang Liu, Bingke Li, Shanhao He, Keliang Wu, Xuejun Dong, Zhiyong Liu, Yanlong Tai","doi":"10.1016/j.cej.2024.154937","DOIUrl":null,"url":null,"abstract":"TiCT MXene is highly compelling as an energy storage material, but 2D MXene sheets experience significant stacking due to hydrogen bonding and van der Waals forces. This blocks active sites and impedes fast electrolyte ion transport. The pseudocapacitance of MXene materials is highly reliant on their terminal groups. Therefore, an effective strategy was designed herein to prepare an oxygen-rich 3D hierarchical porous MXene (P-OR-TiCT). First, Zn powder was used as a template to construct three-dimensional hierarchical porous structures that spanned the microporous, mesoporous, and macroporous scales. Second, Zn powder was used as a metal reducing agent in a reaction at 500 °C to eliminate most −F terminal groups on the MXene. Then, a subsequent acid washing step was used to introduce numerous −O terminal groups. The energy storage process of the prepared MXene was investigated by in situ Raman. More redox active sites (−O terminal groups) are exposed by the constructed oxygen-rich 3D hierarchical porous MXene structure, which also provides a shorter pathway for electrolyte ion transport. P-OR-TiCT displays superb rate performance (88.19 % retention at 100Ag) and ultra-high capacitance (676.7F/g at 2 mV/s and 698.7Fg at 1 Ag) when used as a supercapacitor electrode. Moreover, a symmetric flexible supercapacitor device prepared using P-OR-TiCT and carbon cloth achieves a superb energy density of 32.8Whkg at a power density of 236.5Wkg. This study offers insight into the design of MXenes that exhibit both high capacity and excellent rate performance.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":null,"pages":null},"PeriodicalIF":13.3000,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Oxygen-rich 3D hierarchical porous MXene prepared by Zn powder reduction for flexible supercapacitors\",\"authors\":\"Peilong Ji, Li Liu, Qiang Liu, Bingke Li, Shanhao He, Keliang Wu, Xuejun Dong, Zhiyong Liu, Yanlong Tai\",\"doi\":\"10.1016/j.cej.2024.154937\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"TiCT MXene is highly compelling as an energy storage material, but 2D MXene sheets experience significant stacking due to hydrogen bonding and van der Waals forces. This blocks active sites and impedes fast electrolyte ion transport. The pseudocapacitance of MXene materials is highly reliant on their terminal groups. Therefore, an effective strategy was designed herein to prepare an oxygen-rich 3D hierarchical porous MXene (P-OR-TiCT). First, Zn powder was used as a template to construct three-dimensional hierarchical porous structures that spanned the microporous, mesoporous, and macroporous scales. Second, Zn powder was used as a metal reducing agent in a reaction at 500 °C to eliminate most −F terminal groups on the MXene. Then, a subsequent acid washing step was used to introduce numerous −O terminal groups. The energy storage process of the prepared MXene was investigated by in situ Raman. More redox active sites (−O terminal groups) are exposed by the constructed oxygen-rich 3D hierarchical porous MXene structure, which also provides a shorter pathway for electrolyte ion transport. P-OR-TiCT displays superb rate performance (88.19 % retention at 100Ag) and ultra-high capacitance (676.7F/g at 2 mV/s and 698.7Fg at 1 Ag) when used as a supercapacitor electrode. Moreover, a symmetric flexible supercapacitor device prepared using P-OR-TiCT and carbon cloth achieves a superb energy density of 32.8Whkg at a power density of 236.5Wkg. This study offers insight into the design of MXenes that exhibit both high capacity and excellent rate performance.\",\"PeriodicalId\":270,\"journal\":{\"name\":\"Chemical Engineering Journal\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":13.3000,\"publicationDate\":\"2024-08-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chemical Engineering Journal\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1016/j.cej.2024.154937\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Engineering Journal","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.cej.2024.154937","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Oxygen-rich 3D hierarchical porous MXene prepared by Zn powder reduction for flexible supercapacitors
TiCT MXene is highly compelling as an energy storage material, but 2D MXene sheets experience significant stacking due to hydrogen bonding and van der Waals forces. This blocks active sites and impedes fast electrolyte ion transport. The pseudocapacitance of MXene materials is highly reliant on their terminal groups. Therefore, an effective strategy was designed herein to prepare an oxygen-rich 3D hierarchical porous MXene (P-OR-TiCT). First, Zn powder was used as a template to construct three-dimensional hierarchical porous structures that spanned the microporous, mesoporous, and macroporous scales. Second, Zn powder was used as a metal reducing agent in a reaction at 500 °C to eliminate most −F terminal groups on the MXene. Then, a subsequent acid washing step was used to introduce numerous −O terminal groups. The energy storage process of the prepared MXene was investigated by in situ Raman. More redox active sites (−O terminal groups) are exposed by the constructed oxygen-rich 3D hierarchical porous MXene structure, which also provides a shorter pathway for electrolyte ion transport. P-OR-TiCT displays superb rate performance (88.19 % retention at 100Ag) and ultra-high capacitance (676.7F/g at 2 mV/s and 698.7Fg at 1 Ag) when used as a supercapacitor electrode. Moreover, a symmetric flexible supercapacitor device prepared using P-OR-TiCT and carbon cloth achieves a superb energy density of 32.8Whkg at a power density of 236.5Wkg. This study offers insight into the design of MXenes that exhibit both high capacity and excellent rate performance.
期刊介绍:
The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.