聚乙二醇分子刷接枝改性碳微球及其电化学性能

doi:10.11896/cldb.21080112

Abstract
Figure/Table
References
Related Citation (15)

Download:

Full Text ( PDF ) (6724KB)
Export: BibTeX | EndNote (RIS)

Abstract Carbon material is one of the most important electrode materials of electrochemical capacitor; however, it is always a challenge for carbon materials to be wetted by aqueous electrolyte with polarity, due to the intrinsic non-polarity of carbon materials surface. Herein, polyethylene glycol (PEG) molecular brushes with excellent hydrophilicity were grafted on carbon microspheres (C_sa) surface through polymer grafting to improve the wettability of the C_sa as electrode active materials toward aqueous electrolyte. The dispersibility test of electrode materials in 6 mol/L KOH electrolyte and static water contact angels showed that the PEG molecular brushes modified C_sa (P-C_sa) was better to be wetted by aqueous electrolyte than the unmodified C_sa. Electrochemical tests, such as cyclic voltammograms, galvanostatic charge-discharge, electrochemical impedance spectroscopy, demonstrated that the specific capacity of P-C_sa electrode material was nearly 60% higher than that of unmodified C_sa electrode material at current density of 0.625 A/g, and the P-C_sa electrode material also exhibited excellent rate performance, low intrinsic impedance (0.94 Ω) and high cycle stability (73.29% of the initial specific capacity after 10 000 cycles at current density of 1.25 A/g). It is worth pointing out that the modification of PEG molecular brushes for C_sa electrode material does not introduce faradic pseudocapacitance, which mainly improves the wettability of electrode materials surface toward aqueous electrolyte.

Key words： carbon microspheres molecular brush polyethylene glycol polymer grafting electrode material

Published: 10 November 2022 Online: 2022-11-03

CLC number:	TB324
	TQ316.3

Fund:National Natural Science Foundation of China (51763014, 52073133),the Program for Hongliu Distinguished Young Scholars in Lanzhou University of Technology, and the Youth Science and Technology Fund of Gansu Province (20JR10RA137).

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZHAO Lei
	PENG Yuanyou
	LI Yuan
	ZHANG Qianqian
	RAN Fen

Cite this article:

ZHAO Lei,PENG Yuanyou,LI Yuan, et al. Modifying Carbon Microspheres by Grafting Polyethylene Glycol Molecular Brushes and Its Electrochemical Performance[J]. Materials Reports, 2022, 36(21): 21080112-7.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21080112 OR http://www.mater-rep.com/EN/Y2022/V36/I21/21080112

1 Simon P, Gogosti Y. Nature Materials, 2008, 7(11), 845.
2 Burke A. Journal of Power Sources, 2000, 91(1), 37.
3 Wang Z, Zhu M, Pei Z, et al. Materials Science & Engineering R, 2020, 139, 100520.
4 Huang X Y, Wang L, Wang H C, et al. Small, 2020, 16(15), 1902827.
5 Zhang L L, Zhao X S. Chemical Society Reviews, 2009, 38(9), 2520.
6 Zhai Y, Dou Y, Zhao D, et al. Advanced Materials, 2011, 23(42), 4828.
7 Augustyn V, Simon P, Dunn B. Energy & Environmental Science, 2014, 7(5), 1597.
8 Yu M M, Ji X W, Ran F. Carbohydrate Polymers, 2021, 255, 117346.
9 Gonzalez A, Goikolea E, Andoni Barrena J, et al. Renewable & Sustai-nable Energy Reviews, 2016, 58, 1189.
10 Choi C, Lee J A, Choi A Y,et al. Advanced Materials, 2014, 26(13), 2059.
11 Islam M S, Deng Y, Tong L, et al. Carbon, 2016, 96, 701.
12 Cao X, Shi Y, Shi W, et al. Small, 2011, 7(22), 3163.
13 Zhang L L, Zhou R, Zhao X S. Journal Materials Chemistry, 2010, 20(29), 5983.
14 Chen D, Feng H, Li J. Chemical Reviews, 2012, 112(11), 6027.
15 Lee J, Kim J, Hyeon T. Advanced Materials, 2006, 18(16), 2073.
16 Wu D C, Xu F, Sun B, et al. Chemical Reviews, 2012, 112(7), 3959.
17 Li W C, Nong G Z, Lu A H, et al. Journal of Porous Materials, 2011, 18(1), 23.
18 Liang C D, Hong K L, Guiochon G A, et al. Angewandte Chemie International Edition, 2004, 43(43), 5785.
19 Xu J, Wang A, Zhang T. Carbon, 2012, 50(5), 1807.
20 Zhao J, Lai H, Lyu Z, et al. Advanced Materials, 2015, 27(23), 3541.
21 Wang D W, Li F, Liu M, et al. Angewandte Chemie International Edition, 2008, 47, 373.
22 Zhao J, Jiang Y, Fan H, et al. Advanced Materials, 2017, 29(11), 1604.
23 Yan K, Kong L B, Dai Y H, et al. Journal of Materials Chemistry A, 2015, 3(45), 22781.
24 Hao G P, Zhang Q, Sin M, et al. Chemistry of Materials, 2016, 28, 8715.
25 Wang Z, Zhang W, Tan Y, et al. ACS Applied Materials & Interfaces, 2019, 11(17), 16087.
26 Deng Y F, Xie Y, Zou K X, et al. Journal Materials Chemistry A, 2016, 4, 1144.
27 Lang J W, Yan X B, Liu W M, et al. Journal of Power Sources, 2012, 204, 220.
28 Jang I Y, Muramatsu H, Park K C, et al. Electrochemistry Communications, 2009, 11(4), 719.
29 Tan Y T, Ran F, Kong L B, et al. Synthetic Metals, 2012, 162(1-2), 114.
30 Lang J W, Kong L B, Liu M, et al. Journal of the Electrochemical Society, 2010, 157(12), A1341.
31 Tan Y T, Kong L B, Kang L, et al. Materials Reports A: Review Paper, 2018, 32(1), 47(in Chinese).
谭永涛, 孔令斌, 康龙, 等.材料导报:综述篇,2018, 32(1), 47.
32 Zhang J, Yi X B, Ju W, et al. Electrochemistry Communications, 2017, 74, 19.
33 Zhao B, Hu H, Yu A P, et al. Journal of the American Chemical Society, 2005, 127, 8197.
34 Lin T Q, Chen I W, Liu F X, et al. Science, 2015, 350(6267), 1508.
35 Fleischmann S, Mitchell J B, Wang R, et al. Chemical Reviews, 2020, 120(14), 6738.
36 Simon P, Gogotsi Y, Dunn B. Science, 2014, 343(6176), 1210.