共查询到20条相似文献,搜索用时 57 毫秒
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以柠檬酸锌为前体,利用碳化过程中产生的ZnO作为模板,制备了具有高比表面积和丰富孔道结构的多孔炭材料,系统研究了碳化温度对所得材料比表面积、孔体积及超级电容器性能的影响。结果表明:随着温度的升高,比表面积增大,孔容增大,多孔炭材料的电容性能也相应提高,在碳化温度为1273K时,所得炭材料(Zn C1273)的比表面积高达1763m2/g,孔容为3. 08cm3/g。利用1. 0mol/L四乙基四氟硼酸铵的乙腈溶液为电解质,所得炭材料作为电极应用于超级电容器,在0. 5~20A/g高电流密度下的容量保持率为93. 2%。 相似文献
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沸石矿模板炭的制备及其纳米孔的形成机理 总被引:1,自引:0,他引:1
分别以沸石矿和人造沸石为模板、蔗糖为碳源、采用模板法制备了多孔炭材料。采用SEM和N2吸附对样品进行了表征。结果表明,沸石矿模板炭的比表面积(1070m2/g)比人造沸石模板炭的比表面积(1820m2/g)低,但沸石矿模板炭的总孔容(1.39cm3/g)和中孔孔容(0.98cm3/g)均明显高于人造沸石模板炭的总孔容(1.02cm3/g)和中孔孔容(0.39cm3/g)。沸石矿模板炭的纳米孔主要由三部分孔组成,即复制模板壁厚的“复制孔”、继承模板孔道的“继承孔”和炭化过程中形成的纳米孔。 相似文献
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采用NaY沸石分子筛作模板,乙酰丙酮为炭前驱体,使用液相浸渍-气相沉积工艺合成了富含微孔和中孔结构的多孔炭材料并对其进行了表征.所合成的多孔炭比表面积1351m2/g,孔容0.892cm3/g,微孔率0.63,孔径分布多在0.8nm~3.0nm之间. 相似文献
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多孔炭电极的表面改性与优化是实现超级电容器优异性能的关键。本文以煤化学工业的固体副产物为碳源,利用二维层状双氢氧化物(MgAl-LDH)的刚性约束作用耦合KOH活化工艺成功制备了二维富氧多孔炭纳米材料(OPCN)。系统研究了炭化温度对OPCN样品微观结构和表面特性的影响,通过SEM、TEM、氮气吸脱附测试以及元素分析等表征手段对炭材料的结构/组成和表面特性进行分析表明,经700°C炭化获得的炭材料样品(OPCN-700)具有较高的氧质量分数(24.4%)和大的比表面积(2 388 m2 g-1),并表现出良好的润湿性。同时,OPCN-700样品丰富的微孔和二维纳米片结构为电解质离子提供了有效的储存和传输途径。作为超级电容器的电极材料,在电流密度为0.5 A g-1时,其比电容高达382 F g-1,并呈现出优异的倍率性能和循环稳定性。该技术策略为富氧原子掺杂二维多孔炭材料的可控制备与水系储能器件的设计构建提供了新思路。 相似文献
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Yiting Peng Zheng Chen Jing Wen Qiangfeng Xiao Ding Weng Shiyu He Hongbin Geng Yunfeng Lu 《Nano Research》2011,4(2):216-225
MnO2/carbon nanocomposites with hierarchical pore structure and controllable MnO2 loading have been synthesized using a self-limiting growth method. This was achieved by the redox reactions of KMnO4 with sacrificed carbon substrates that contain hierarchical pores. The unique pore structure allows the synthesis of nanocomposites
with tunable MnO2 loading up to 83 wt.%. The specific capacitance of the nanocomposites increased with the MnO2 loading; the conductivity measured by electrochemical impedance spectroscopy, on the other hand, decreased with increasing
MnO2 loading. Optimization of the MnO2 loading resulted in nanocomposites with high specific capacitance and excellent rate capability. This work provides important
fundamental understanding which will facilitate the design and fabrication of high-performance supercapacitor materials for
a large variety of applications. 相似文献
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Nitrogen-oxygen co-doped corrugation-like porous carbon (NO-PC) has been developed by direct pyrolysis of formaldehyde-melamine polymer containing manganese nitrate. The melamine, formaldehyde and manganese nitrate act as nitrogen, oxygen source and pore-foaming agent, respectively. NO-PC exhibits favorable porous architecture for efficient ion transfer and moderate heteroatom doping for additional pseudocapacitance, which synergistically enhances the electrochemical performance of the NO-PC-based supercapacitor. The electrode delivers specific capacitance of 240 F/g at 0.3 A/g when tested in 6 mol/L KOH electrolyte, good rate capability (capacitance retention of 83.3% at 5 A/g) as well as stable cycling performance (capacitance remains ~96% after 10000 cycles at 3 A/g). The facile synthesis with unique architecture and chemistry modification offers a promising candidate for electrode material of energy storage devices. 相似文献
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超级电容电池用碳类复合负极材料的研究 总被引:1,自引:0,他引:1
研制了新型储能器件超级电容电池用石墨和活性炭复合负极材料,应用恒流充放电法,考察了这种复合负极材料的电化学性能.结果表明这种碳复合负极材料兼具良好的电容特性和电池特性,在基本保持电池特性的同时,能将电容器电位窗口从2.5V提高至3.5V vs Li/Li+,能量密度从21.7Wh/kg提高至40.3wh/kg,增大近两倍;有很好的倍率性能,电流密度从0.1A/g增加到1A/g时,比容量仅下降了1.3F/g;同时能保持良好的循环性能,10次容量保持率即使在3.5V高压下仍有96.7%. 相似文献
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炭气凝胶作为一种新型具有特殊无定型结构的功能材料引起了各国研究者的极大兴趣.随着电吸附理论的发展,炭气凝胶日益成为具有诱人发展前景的电吸附材料.阐述了炭气凝胶的发展、研究动态及应用前景,探讨了电吸附理论及其基本原理,着重就炭气凝胶在电吸附领域的工业应用进行论述. 相似文献
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利用恒流充放电、交流阻抗和循环伏安法深入研究了电极片质量、粘结剂PTFE的含量、平压压力和电解液KOH浓度等超级电容器器件制作工艺对聚苯乙烯基层次孔炭材料的电化学性能的影响。结果表明这些器件制作工艺对层次孔炭材料的储电性能有非常大的影响。当电极片质量约为9mg,PTFE含量为8%,平压压力为4MPa,KOH浓度为4mol/L时,层次孔炭材料的储电容量最大,可达135F/g;而当器件制作工艺不佳时,其储电容量出现不同程度的下降,最差时仅为56F/g,为最优工艺的41%。 相似文献
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新型聚合物多孔材料的制备研究进展 总被引:1,自引:0,他引:1
介绍了超浓乳液的形成及其特点,综述了超浓乳液作模板制备聚合物多孔材料的方法、机理和化学改性等方面的研究进展,并对其发展前景进行了展望. 相似文献
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Meng REN Ying FANG Yufan ZHANG Heli DENG Desuo ZHANG Hong LIN Yuyue CHEN Jiaqing XIONG 《材料科学前沿(英文版)》2022,16(2):220597
Fabrication of elastic pressure sensors with low cost, high sensitivity, and mechanical durability is important for wearables, electronic skins and soft robotics. Here, we develop high-sensitivity porous elastomeric sensors for piezoresistive and capacitive pressure detection. Specifically, a porous polydimethylsiloxane (PDMS) sponge embedded with conductive fillers of carbon nanotubes (CNTs) or reduced graphene oxide (rGO) was fabricated by an in-situ sugar template strategy. The sensor demonstrates sensitive deformation to applied pressure, exhibiting large and fast response in resistance or capacitance for detection of a wide range of pressure (0‒5 kPa). PDMS, as a high-elasticity framework, enables creation of sensors with high sensitivity, excellent stability, and durability for long-term usage. The highest sensitivities of 22.1 and 68.3 kPa−1 can be attained by devices with 5% CNTs and 4% rGO, respectively. The geometrics of the sponge sensor is tailorable using tableting technology for different applications. The sensors demonstrate finger motion detection and heart-rate monitoring in real-time, as well as a capacitive sensor array for identification of pressure and shape of placed objects, exhibiting good potential for wearables and human-machine interactions. 相似文献