Tailored glycol-functionalized mixed-conductive polythiophene coatings enable stable zinc anodes

IF 32.4 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Energy & Environmental Science Pub Date : 2025-04-23 DOI:10.1039/d5ee00584a

Hui Zhang, Tianyu Qiu, Jinlin Yang, Yifei Ma, Chenfeng Ding, Luis K. Ono, Jinfeng Zeng, Wanli Liu, Shu-Nan Zhao, Chao Zou, Qing Jiang, Yabing Qi, Xinlong Tian, Hu Chen

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Abstract

Polymer protective layers possessing high flexibility and compatibility with substrates show potentials to stabilize zinc anodes. However, inferior electronic or ionic conductivity, as well as limited structural tunability restrain electrochemical reaction kinetics and targeted optimization of polymers. Here we present a mixed-conductive polythiophene coating, namely pgBTTT with tailored glycol side chains. Compared with its alkyl chain counterpart of pBTTT, pgBTTT exhibits superior electronic and ionic conductivity, and zincophilicity to guide uniform zinc deposition. Moreover, the strong coordination of thiophene main chains of pgBTTT with zinc ions accelerate ion transport and diffusion through building exclusive channels. Correspondingly, the cyclic stability of zinc-zinc symmetric cells is improved with a small polarization voltage of 30 mV at 2 mA cm-2. The full battery with NH4VO4 cathode delivers a high specific capacity of 528 mAh g-1 at 0.2 A g-1 with a low capacity-fading rate of 0.0183% per cycle after 1000 cycles.

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定制的乙二醇功能化混合导电聚噻吩涂层使锌阳极稳定

聚合物保护层具有较高的柔韧性和与基体的相容性，具有稳定锌阳极的潜力。然而，较差的电子或离子电导率以及有限的结构可调性限制了聚合物的电化学反应动力学和靶向优化。在这里，我们提出了一种混合导电聚噻吩涂层，即具有定制乙二醇侧链的pgBTTT。与烷基链pBTTT相比，pgBTTT具有优异的电子和离子导电性，并具有亲锌性，可指导均匀的锌沉积。此外，pgBTTT的噻吩主链与锌离子的强配位促进了离子的传递和扩散，并建立了排他性通道。当极化电压为30 mV，电压为2 mA cm-2时，锌-锌对称电池的循环稳定性得到改善。采用NH4VO4阴极的全电池在0.2 a g-1时具有528 mAh g-1的高比容量，经过1000次循环后，每循环的容量衰减率低至0.0183%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Energy & Environmental Science 化学-工程：化工

CiteScore

50.50

自引率

2.20%

发文量

349

审稿时长

2.2 months

期刊介绍： Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences." Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).