Local protonation of polyaniline induced by nitrogen-doped carbon skeleton towards ultra-stable Zn-organic batteries with a dual-ion insertion/extraction mechanism
Jiawei Gu , Ze Yuan , Haiyan Wang , Junling Shen , Jiqiang Ning , Yijun Zhong , Yong Hu
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引用次数: 14
Abstract
Organic compounds are promising cathode materials for efficient aqueous Zn-ion batteries due to their structural diversity and tunability, but their limited capacity and inadequate cycle life plague the practical applications. In this study, a two-step MOF-derived pyrolysis and oxidative polymerization strategy has been developed to prepare locally protonated nitrogen-doped carbon dodecahedron@polyaniline (NCD@PANI) nanohybrids as an efficient cathode for ultra-stable Zn-ion storage. The N-doped carbon skeleton with rich pyrrolic-N groups can serve as the coordinator to regulate the local protonation environment of PANI through strong hydrogen bond interactions, thus promoting the redox reactions. As expected, the as-assembled NCD@PANI//Zn battery exhibits excellent electrochemical performances, including a high capacity of 325 mAh g−1 at 0.2 A g−1 and a long cycle life of 5000 cycles. The governing Zn2+/H+ dual-ion insertion/extraction mechanism is further unveiled using a series of ex situ measurements. This work provides a new strategy to develop high-performance organic compound electrodes for efficient energy storage devices through the technique of local protonation.
有机化合物由于其结构的多样性和可调性,是高效水性锌离子电池极具发展前景的正极材料,但其容量和循环寿命有限,制约了其实际应用。在这项研究中,开发了一种由mof衍生的两步热解和氧化聚合策略,以制备局部质子化的氮掺杂碳dodecahedron@polyaniline (NCD@PANI)纳米杂化物,作为超稳定zn离子存储的高效阴极。含有丰富吡咯- n基团的n掺杂碳骨架可以作为配合物,通过强氢键相互作用调节聚苯胺的局部质子化环境,从而促进氧化还原反应。正如预期的那样,组装后的NCD@PANI//Zn电池表现出优异的电化学性能,包括在0.2 a g−1下的325 mAh g−1的高容量和5000次循环的长循环寿命。通过一系列的非原位测量,进一步揭示了Zn2+/H+双离子的插入/萃取机理。本研究为利用局域质子化技术开发高效储能器件的高性能有机化合物电极提供了新的思路。
期刊介绍:
The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.