【热门文章】柔性非对称超级电容器的制备

Super-conductive silver nanoparticles functioned three-dimensional Cu_xO foams as a high-pseudocapacitive electrode for flexible asymmetric supercapacitors

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江苏大学严学华教授团队在Journal of Materiomics 第7卷第1期发表了题为“Super-conductive silver nanoparticles functioned three-dimensional Cu_xO foams as a high-pseudocapacitive electrode for flexible asymmetric supercapacitors”的研究论文。

文章报道了一种自发生长在泡沫铜(CF)上的银纳米颗粒修饰的Cu_xO纳米线。氧化铜因理论电容高、成本低、毒性小等特点，引起储能领域的广泛关注，但由于其导电性差、循环寿命不稳定等原因，其应用仍面临挑战。无黏结剂泡沫电极具有丰富的多孔结构和高的比表面积，与电解液接触良好。泡沫铜的骨架结构为Cu_xO纳米线的生长提供了大量的活性位点。此外，将Cu_xO/CF电极材料与Ag纳米颗粒结合，改善Cu_xO的导电性，并促进Cu_xO与电解质离子的反应。利用表面氧化反应和置换反应制备了四组不同反应时间下的Ag/Cu_xO/CF复合材料，研究了表面控制和扩散控制过程对其电化学性能的影响。其中，Ag/Cu_xO/CF-40电极在2 mA cm^-2电流密度下的比电容为1192 mF cm^-2。以AC/泡沫镍为负极，PVA/KOH为凝胶固态电解质，Ag/Cu_xO/CF-40为正极，成功地制备了柔性非对称超级电容器(ASC)，在功率密度为3.00 mW cm^-2时，其能量密度达到46.32 μWh cm^-2。将两个ASC串联成功点亮一个2V的LED灯。该研究为制备低内阻无黏结剂的柔性Ag/Cu_xO/CF电极提供了一种新的策略，在柔性超级电容器或其他可穿戴电子器件中具有良好的应用前景。

DOI:10.1016/j.jmat.2020.07.008

Highlights

·Cu_xO nanowires are vertically grown on Cu foam via a facile surface oxidation.

·Ag nanoparticles are then decorated Cu_xO nanowires via a replacement reaction.

·The contribution ratio of pseudocapacitance for capacitive process is discussed.

·A 2V LED is lighted up for 90 seconds by two ASC in series.

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Fig. 1 The synthesis route of Ag/CuxO/CF.

Fig. 2 SEM images of (a) CF, (b) Cu_xO/CF, (c) Ag/Cu_xO/CF-10, (d) Ag/Cu_xO/CF-20 (e) Ag/Cu_xO/CF-40, (f) Ag/Cu_xO/CF-60, (g) Ag/Cu_xO/CF at high magnification, (h) EDX spectrum of Ag/Cu_xO/CF, and (i) Mapping images of Ag/Cu_xO/CF.

Fig. 5 (a) CV curves of Cu_xO/CF and Ag/Cu_xO/CF at 100 mV s ^-1, (b) GCD curves of Cu_xO/CF and Ag/Cu_xO/CF at 2 mA cm^-2, (c) calculated areal capacitance values of all samples against with current densities, and (d) Nyquist plots of Cu_xO/CF and Ag/Cu_xO/CF.

Fig. 7 (a) Schematic diagram of the asymmetric supercapacitor, (b-c) CV and GCD curves of the ASC operated at different potentials, (d-e) CV curves and GCD curves of the ASC at various scan rates and current densities, (f) specific capacitance, (g) Nyquist plot, (h) cycling performance after 10000 cycles at 5 mA cm^-2 and (i) Ragone plot of the ASC.

作者介绍

Prof. Dr. Xuehua Yan is a Professor in School of Materials Science and Engineering, Jiangsu University, China. He got his Ph.D. in 2006 from Jiangsu University, worked in Technical University of Darmstadt (Germany) in 2008 as a visiting Professor and collaborated with Prof. Dr. Ralf Riedel. His research focuses on functional inorganic materials and composites, including photocatalytic nanomaterials, energy storage materials and porous materials. He has published 130 peer-reviewed papers and hold 18 national patents. He is a member of the editorial committee of Journal of the Chinese Ceramic Society.

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Journal of Materiomics（JMAT），由中国硅酸盐学会主办。该刊引领材料学科发展前沿，注重报道以材料设计、制备、表征及应用技术为主线的系统性前沿研究成果。点击文末“阅读全文“可免费获取所有论文全文。  Journal of Materiomics 入选首批中国科技期刊卓越行动计划（2020年度评估为优秀），被SCI和Scopus收录，影响因子6.425(Materials Science, Multidisciplinary；Physics，Applied；Chemistry，Physical均位于Q1分区)，Citescore为8.8。

  The Journal of Materiomics is indexed by SCI  (IF=6.425, rank in Q1 of Materials Science, Multidisciplinary；Physics，Applied；Chemistry，Physical) and Scopus (Citescore 8.8), aims to provide a continuous forum for the dissemination of research in the general field of materials science, particularly systematic studies of the relationships among composition, processing,structure, property, and performance of advanced materials. Supported by the Chinese Ceramic Society, the Journal of Materiomics is a peer-reviewed open-access journal.

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