阳极
掺杂剂
碳纤维
热解
卤化物
化学工程
无机化学
电化学
蚀刻(微加工)
材料科学
钾
化学
纳米技术
兴奋剂
电极
有机化学
光电子学
复合数
物理化学
图层(电子)
工程类
复合材料
作者
Fei Yuan,Wu Zhang,Sijia Zhang,Zhaojin Li,Qiujun Wang,Huilan Sun,Di Zhang,Wei Wang,Bo Wang
标识
DOI:10.1016/j.jcis.2024.01.021
摘要
Coupling sites of nitrogen-dopants and intrinsic carbon defects (N/DC) are highly attractive to improve potassium-storage capacity and cycling stability, yet it is hard to effectively construct them. Herein, a novel strategy is proposed to establish abundant N/DC sites in N-doped carbon (ZIF8/NaBr-1-900) by pyrolyzing the mixture of metal–organic framework (ZIF8)/sodium bromide (NaBr). Systematic investigations disclose that the introduced NaBr can promote the full conversion of Zn-N4 moieties into zinc oxide (ZnO) via a “bait and switch” mechanism. Such formed endogenous ZnO can etch the carbon matrix of the confined domains around the N dopants during pyrolysis process, and meanwhile the released N-atoms from Zn-N4 moieties can largely form edge-N. As such, these N/DC coupling sites enable the resultant carbon to have a more significant capacitive behavior related to fast K-ion migration and high structural stability, leading to 255.3 mAh/g at 2 A/g with a prolonged cycle lifespan over 2000 cycles. Moreover, the assembled K-full battery presents a high energy density of 171.2 Wh kg−1 and excellent cyclability over 5000 cycles. This NaBr-mediated endogenous ZnO domain-confined etching strategy provides a new insight into the exploration of advanced carbon anode.
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