CN116230417A - 一种用于超级电容器的纳米多孔碳的制备方法 - Google Patents
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Abstract
本发明提供了一种用于超级电容器的纳米多孔碳的制备方法,属于超级电容器的技术领域,解决了电容器的比容量较低的难题。包括以下步骤:步骤1、获取纳米多孔碳前驱体。步骤2、获得沉积20%Fe(OH)2的纳米多孔碳前驱体。步骤3、经过高温碳化后,获得含有铁元素的纳米多孔碳。步骤4、将含有铁元素的纳米多孔碳进行二次欠电位。
Description
技术领域
本发明涉及超级电容器技术领域,尤其是涉及一种用于超级电容器的纳米多孔碳的制备方法。
背景技术
随着各个国家对航天军事通信等高技术领域足够重视,超级电容器作为一种性能卓越的致密能源,成为国际上发达国家材料、电子、化学、物理等多学科研究的最活跃的研究领域之一,其目标是制备高比功率、高比容量的致密能源所需的电极材料以及宽电化学窗的、导电率高的电解质,进而制备超大功率、超高容量可用于动力用途的大型超级电容器。
目前主流制造超级电容器的材料是活性炭,但活性炭的比容量和比表面积有所局限,难以实现更高的比容量。
尽管目前的电容电池技术已经取得不错的发展,但目前仍然存在比容量较低的问题。
发明内容
本发明的目的在于提供一种用于超级电容器的纳米多孔碳的制备方法,缓解了现有技术中存在的超级电容器的比容量较低的问题。
本发明提供的一种用于超级电容器的纳米多孔碳的制备方法,包括以下步骤:
步骤一,采用间苯二酚、邻苯二酚、间苯三酚、三聚氰胺和甲醛为原材料,碳酸氢钠为催化剂,在水溶液中合成有机湿凝胶,将有机湿凝胶在山梨醇酐油酸酯的去离子水溶液中反复清洗。随后经过干燥后获得纳米多孔碳前驱体。
步骤二,将纳米多孔碳前驱体粉化后,用Fe(NO3)2溶液浸泡纳米多孔碳前驱体,随后经过NaOH溶液中进行搅拌,获得Fe(OH)2的纳米多孔碳前驱体。
步骤三,1000℃碳化前驱体后,再经过CO2活化,获得含有铁元素的纳米多孔碳。
步骤四,将含有铁的纳米多孔碳放在用于超级电容器的KOH电解液中加入以下任一种离子溶液Al3+,Li+,Zn2+,Cu2+,Pb2+,进行二次欠电位沉积。
进一步的,所述步骤二中获取的纳米多孔碳前驱体的具体方法为:用Fe(NO3)2溶液在真空条件下浸泡纳米多孔碳前驱体,浸泡12-24h,随后放入到3.0-5.0mol/L的NaOH溶液中进行搅拌,使得纳米多孔碳前驱体的表面上沉积Fe(OH)2,抽滤得到沉积20~30%Fe(OH)2的纳米多孔碳前驱体。
进一步的,所述修饰步骤四中含有铁的纳米多孔碳的方法:用Al3+,Li+,Zn2+,Cu2+,Pb2+硝酸盐溶液中的任一种离子溶液在真空条件下浸泡含铁元素的纳米多孔碳,将其放在用于超级电容器的1.0-6.0mol/L的KOH电解液中进行搅拌,使得加入的Al3+,Li+,Zn2+,Cu2 +,Pb2+,离子浓度为2.0~4.0×10-2mol/L。
本发明提供的,通过金属离子在纳米多孔碳表面进行两次欠电位沉积,可获得混合型超级电容器,为电化学双层电容器提供法拉第赝电容,使用本方法制备的超级电容器与蓄电池或其他电池配合组成符合电池,有效地解决了现有电池不能同时满足高功率、大容量、快速充电要求的难题,可以应用于航天军事通信等高要求领域,具有较高的应用价值。
本发明提供的,具有比传统的活性炭拥有更好的比容量,同时纳米多孔碳的结构人工可控,可以针对要求的比表面积和孔径进行有目标的制造,所以对纳米多孔碳进行欠电位沉积,拥有更大的潜力。
附图说明
图1为本发明实施例提供的纳米多孔碳电极材料在6mol/L的KOH电解液中的CV曲线;
图2为本发明实施例提供的含有金属离子的纳米多孔碳的SEM图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图和具体实施例,对本发明进行进一步详细说明。
本发明提供的一种用于超级电容器的纳米多孔碳的制备方法,包括以下步骤:
步骤一,采用间苯二酚、邻苯二酚、间苯三酚、三聚氰胺和甲醛为原材料,碳酸氢钠为催化剂,在水溶液中合成有机湿凝胶,将有机湿凝胶在山梨醇酐油酸酯的去离子水溶液中反复清洗。随后经过干燥后获得纳米多孔碳前驱体。
步骤二,将纳米多孔碳前驱体粉化后,用Fe(NO3)2溶液浸泡纳米多孔碳前驱体,随后经过NaOH溶液中进行搅拌,获得Fe(OH)2的纳米多孔碳前驱体。
步骤三,1000℃碳化前驱体后,再经过CO2活化,获得含有铁元素的纳米多孔碳。
步骤四,将含有铁的纳米多孔碳放在用于超级电容器的KOH电解液中加入以下任一种离子溶液Al3+,Li+,Zn2+,Cu2+,Pb2+,进行二次欠电位沉积。
本发明实施例提供的用于超级电容器的纳米多孔碳的制备方法,利用法拉第赝电容为双层电容器提高电容,形成混合型超级电容器的技术是非常有意义的。本发明选择能够在纳米多孔碳材料表面发生欠电位沉积的金属离子以提高纳米多孔碳电极的比电容,从而增加超级电容器的容量。
进一步的,所述步骤二中获取的纳米多孔碳前驱体的具体方法为::用Fe(NO3)2溶液在真空条件下浸泡纳米多孔碳前驱体,浸泡12-24h,随后放入到3.0-5.0mol/L的NaOH溶液中进行搅拌,使得纳米多孔碳前驱体的表面上沉积Fe(OH)2,抽滤得到沉积20~30%Fe(OH)2的纳米多孔碳前驱体。
单体双层电容器以高比表面积材料,如纳米多孔碳固/液几面处的双层电容为基础,与传统的电容器类似,电能的储存是以横快电极/溶液界面的电解制双层内的充电为基础的,当把直流电压施加到电极的界面时,电双层就建立起储存电能。储存在双层中的电能与电极的表面积成正比,和双层厚度成反比。电化学双层电容器是包含一对理想极化电极的装置;换句话说,只有在操作电位范围内部发生法拉第反应的那些装置才可以认为是电化学双层电容器,并且所有积聚的电荷都用来形成导体/溶液间的双层。
进一步的,所述修饰步骤四中含有铁的纳米多孔碳的方法:用Al3+,Li+,Zn2+,Cu2+,Pb2+硝酸盐溶液中的任一种离子溶液在真空条件下浸泡含铁元素的纳米多孔碳,将其放在用于超级电容器的1.0-6.0mol/L的KOH电解液中进行搅拌,使得加入的Al3+,Li+,Zn2+,Cu2+,Pb2+离子浓度为2.0~4.0×10-2mol/L。
所谓的超级电容,除双层储存、电能外,还包括它在电极界面上发生的二维和准二维的法拉第反应,这部分反应使得电能转变为化学能储存在界面。金属离子在电极电位低于可逆的平衡电极电位时才能在电极上还原为金属,而一些金属离子在电极电位正于可逆的平衡电极电位时就会沉积在异种金属的基片上,形成金属单原子层,即所谓欠电位沉积,形成的沉积具有电吸收式赝电容作用。
以上所述实施例,仅为本发明的具体实施方式,用以说明本发明的技术方案,而非对其限制,本发明的保护范围并不局限于此,尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,其依然可以对前述实施例所记载的技术方案进行修改或可轻易想到变化,或者对其中部分技术特征进行等同替换;而这些修改、变化或者替换,并不使相应技术方案的本质脱离本发明实施例技术方案的范围。都应涵盖在本发明的保护范围之内。因此,本发明的保护范围应以权利要求的保护范围为准。
Claims (3)
1.一种用于超级电容器的纳米多孔碳的制备方法,其特征在于:
包括以下步骤:
步骤1:采用间苯二酚、邻苯二酚、间苯三酚、三聚氰胺和甲醛为原材料,碳酸氢钠为催化剂,在水溶液中合成有机湿凝胶,将有机湿凝胶在山梨醇酐油酸酯的去离子水溶液中反复清洗,随后经过干燥后获得纳米多孔碳前驱体;
步骤2:将纳米多孔碳前驱体粉化后,用Fe(NO3)2溶液浸泡纳米多孔碳前驱体粉末,随后经过NaOH溶液中进行搅拌,获得Fe(OH)2的纳米多孔碳前驱体;
步骤3:1000℃碳化前驱体后,再经过CO2活化,获得含有铁元素的纳米多孔碳;
步骤4:将含有铁的纳米多孔碳放在用于超级电容器的KOH电解液中加入Al3+、Li+、Zn2+、Cu2+、Pb2+中的任一种离子溶液,进行二次欠电位沉积。
2.根据权利要求1所述的一种用于超级电容器的纳米多孔碳的制备方法,其特征在于,步骤2具体包括:
所述修饰纳米多孔碳前驱体的方法为:用Fe(NO3)2溶液在真空条件下浸泡纳米多孔碳前驱体,浸泡12-24h,随后放入到3.0-5.0mol/L的NaOH溶液中进行搅拌,使得纳米多孔碳前驱体的表面上沉积Fe(OH)2,抽滤得到沉积20~30%Fe(OH)2的纳米多孔碳前驱体。
3.根据权利要求1所述的一种用于超级电容器的纳米多孔碳的制备方法,其特征在于步骤4具体包括:
用Al3+,Li+,Zn2+,Cu2+,Pb2+硝酸盐溶液中的任一种离子溶液在真空条件下浸泡含铁元素的纳米多孔碳,将其放在用于超级电容器的1.0-6.0mol/L的KOH电解液中进行搅拌,使得加入的Al3+,Li+,Zn2+,Cu2+,Pb2+离子浓度为2.0~4.0×10-2mol/L。
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