{"title":"超快多孔碳活化有望实现高能量密度超级电容器","authors":"Zhedong Liu, Cunpeng Duan, Shuming Dou, Qunyao Yuan, Jie Xu, Wei-Di Liu, Yanan Chen","doi":"10.1002/smll.202200954","DOIUrl":null,"url":null,"abstract":"<p>Activated porous carbons (APCs) are traditionally produced by heat treatment and KOH activation, where the production time can be as long as 2 h, and the produced activated porous carbons suffer from relatively low specific surface area and porosity. In this study, the fast high-temperature shock (HTS) carbonization and HTS-KOH activation method to synthesize activated porous carbons with high specific surface area of ≈843 m<sup>2</sup> g<sup>-1</sup>, is proposed. During the HTS process, the instant Joule heating (at a heating speed of ≈1100 K s<sup>-1</sup>) with high temperature and rapid quenching can effectively produce abundant pores with homogeneous size-distribution due to the instant melt of KOH into small droplets, which facilitates the interaction between carbon and KOH to form controllable, dense, and small pores. The as-prepared HTS-APC-based supercapacitors deliver a high energy density of 25 Wh kg<sup>-1</sup> at a power density of 582 W kg<sup>-1</sup> in the EMIMBF<sub>4</sub> ionic liquid. It is believed that the proposed HTS technique has created a new pathway for manufacturing activated porous carbons with largely enhanced energy density of supercapacitors, which can inspire the development of energy storage materials.</p>","PeriodicalId":228,"journal":{"name":"Small","volume":"18 23","pages":""},"PeriodicalIF":13.0000,"publicationDate":"2022-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"45","resultStr":"{\"title\":\"Ultrafast Porous Carbon Activation Promises High-Energy Density Supercapacitors\",\"authors\":\"Zhedong Liu, Cunpeng Duan, Shuming Dou, Qunyao Yuan, Jie Xu, Wei-Di Liu, Yanan Chen\",\"doi\":\"10.1002/smll.202200954\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Activated porous carbons (APCs) are traditionally produced by heat treatment and KOH activation, where the production time can be as long as 2 h, and the produced activated porous carbons suffer from relatively low specific surface area and porosity. In this study, the fast high-temperature shock (HTS) carbonization and HTS-KOH activation method to synthesize activated porous carbons with high specific surface area of ≈843 m<sup>2</sup> g<sup>-1</sup>, is proposed. During the HTS process, the instant Joule heating (at a heating speed of ≈1100 K s<sup>-1</sup>) with high temperature and rapid quenching can effectively produce abundant pores with homogeneous size-distribution due to the instant melt of KOH into small droplets, which facilitates the interaction between carbon and KOH to form controllable, dense, and small pores. The as-prepared HTS-APC-based supercapacitors deliver a high energy density of 25 Wh kg<sup>-1</sup> at a power density of 582 W kg<sup>-1</sup> in the EMIMBF<sub>4</sub> ionic liquid. It is believed that the proposed HTS technique has created a new pathway for manufacturing activated porous carbons with largely enhanced energy density of supercapacitors, which can inspire the development of energy storage materials.</p>\",\"PeriodicalId\":228,\"journal\":{\"name\":\"Small\",\"volume\":\"18 23\",\"pages\":\"\"},\"PeriodicalIF\":13.0000,\"publicationDate\":\"2022-05-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"45\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Small\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/smll.202200954\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Small","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/smll.202200954","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 45
摘要
活性炭(APCs)的传统生产方法是热处理和KOH活化,其生产时间长达2 h,所生产的活性炭具有相对较低的比表面积和孔隙率。本研究提出了快速高温冲击(HTS)碳化和高温高温-氢氧化钾活化法制备高比表面积(≈843 m2 g-1)的多孔活性炭。在高温加热过程中,高温快速淬火的瞬间焦耳加热(加热速度≈1100 K s-1),由于KOH瞬间熔化成小液滴,可以有效地产生丰富且尺寸分布均匀的孔隙,有利于碳与KOH相互作用形成可控、致密的小孔隙。制备的基于hts - apc的超级电容器在EMIMBF4离子液体中以582 W kg-1的功率密度提供了25 Wh kg-1的高能量密度。认为该技术为制造活性多孔碳开辟了一条新途径,大大提高了超级电容器的能量密度,可以激发储能材料的发展。
Ultrafast Porous Carbon Activation Promises High-Energy Density Supercapacitors
Activated porous carbons (APCs) are traditionally produced by heat treatment and KOH activation, where the production time can be as long as 2 h, and the produced activated porous carbons suffer from relatively low specific surface area and porosity. In this study, the fast high-temperature shock (HTS) carbonization and HTS-KOH activation method to synthesize activated porous carbons with high specific surface area of ≈843 m2 g-1, is proposed. During the HTS process, the instant Joule heating (at a heating speed of ≈1100 K s-1) with high temperature and rapid quenching can effectively produce abundant pores with homogeneous size-distribution due to the instant melt of KOH into small droplets, which facilitates the interaction between carbon and KOH to form controllable, dense, and small pores. The as-prepared HTS-APC-based supercapacitors deliver a high energy density of 25 Wh kg-1 at a power density of 582 W kg-1 in the EMIMBF4 ionic liquid. It is believed that the proposed HTS technique has created a new pathway for manufacturing activated porous carbons with largely enhanced energy density of supercapacitors, which can inspire the development of energy storage materials.
期刊介绍:
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