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Rational synthesis of a ZIF-67@Co-Ni LDH heterostructure and derived heterogeneous carbon-based framework as a highly efficient multifunctional sulfur host.
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-08-13 , DOI: 10.1039/d0dt02442b Hongtai Li 1 , Quan Jin 2 , Jie Zhao 3 , Bao Wang 3 , Xiaodong Guo 4
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-08-13 , DOI: 10.1039/d0dt02442b Hongtai Li 1 , Quan Jin 2 , Jie Zhao 3 , Bao Wang 3 , Xiaodong Guo 4
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A facile one-pot surfactant-free solvothermal method was developed to synthesize ZIF-67@Co–Ni layered double hydroxide (LDH) heterostructures. By rationally controlling the sequential growth of ZIF-67 and re-precipitation process of 2-MeIM-inserted Co–Ni LDHs, a series of heterogeneous ZIF-67@Co–Ni LDH polyhedra with controllable void space and final hollow Co–Ni LDH polyhedra were obtained through in situ transformation. Typical core-shelled ZIF-67@Co–Ni LDHs, yolk-shelled ZIF-67@Co–Ni LDHs, hollow Co–Ni LDHs, and conventional ZIF-67 were calcined to obtain the derivatives that inherit the morphological characteristics of their corresponding precursors. Due to structural and compositional advantages, the derived core-shelled heterogeneous carbon-based framework composed of a cobalt particle anchored graphitic mesoporous N-doped carbon core and partially reduced Co–Ni layered double oxide (LDO) embedded shell of edge-to-face stacking defective carbon nanosheets exhibited outstanding physical and chemical properties required for high-performance sulfur carrier materials. When employed as a sulfur host, this multifunctional core-shelled carbonaceous derivative smoothly promoted the “immobilization–diffusion–conversion–deposition” process of polysulfides. The as-fabricated sulfur cathode exhibited a remarkably improved electrochemical performance with a high initial discharge specific capacity of 1140 mA h gs−1 at 0.2C and a high retention of 769 mA h gs−1 after 400 cycles at 1C, demonstrating its high utilization of sulfur and effective suppression of the “shuttle effect”.
中文翻译：
ZIF-67 @ Co-Ni LDH异质结构的合理合成和衍生的基于异质碳的骨架，作为高效的多功能硫主体。
开发了一种简便的单锅无表面活性剂溶剂热方法，以合成ZIF-67 @ Co-Ni层状双氢氧化物（LDH）异质结构。通过合理控制ZIF-67的顺序生长和2-MeIM插入的Co-Ni LDH的再沉淀过程，可以制得一系列具有可控空隙空间和最终空心Co-Ni LDH的异质ZIF-67 @ Co-Ni LDH多面体多面体是通过原位获得的转型。对典型的核壳ZIF-67 @ Co-Ni LDH，蛋黄壳ZIF-67 @ Co-Ni LDH，空心Co-Ni LDH和常规ZIF-67进行煅烧，以获得继承其相应形态特征的衍生物。前体。由于结构和组成上的优势，衍生的核壳异质碳基骨架由钴颗粒锚定的石墨介孔氮掺杂碳核和部分还原的Co-Ni层状双面对面氧化镍嵌入壳组成堆叠有缺陷的碳纳米片表现出高性能硫载体材料所需的出色物理和化学性能。当用作硫磺主体时，这种多功能的带壳壳碳质衍生物平稳地促进了多硫化物的“固定化-扩散-转化-沉积”过程。所制得的硫阴极显示出显着改善的电化学性能，并具有1140 mA hg的高初始放电比容量在0.2C下s -1和在1C下进行400次循环后s -1的高保留率769 mA hg s -1，表明其对硫的利用率高，并有效地抑制了“穿梭效应”。
更新日期：2020-09-22
中文翻译：
ZIF-67 @ Co-Ni LDH异质结构的合理合成和衍生的基于异质碳的骨架，作为高效的多功能硫主体。
开发了一种简便的单锅无表面活性剂溶剂热方法，以合成ZIF-67 @ Co-Ni层状双氢氧化物（LDH）异质结构。通过合理控制ZIF-67的顺序生长和2-MeIM插入的Co-Ni LDH的再沉淀过程，可以制得一系列具有可控空隙空间和最终空心Co-Ni LDH的异质ZIF-67 @ Co-Ni LDH多面体多面体是通过原位获得的转型。对典型的核壳ZIF-67 @ Co-Ni LDH，蛋黄壳ZIF-67 @ Co-Ni LDH，空心Co-Ni LDH和常规ZIF-67进行煅烧，以获得继承其相应形态特征的衍生物。前体。由于结构和组成上的优势，衍生的核壳异质碳基骨架由钴颗粒锚定的石墨介孔氮掺杂碳核和部分还原的Co-Ni层状双面对面氧化镍嵌入壳组成堆叠有缺陷的碳纳米片表现出高性能硫载体材料所需的出色物理和化学性能。当用作硫磺主体时，这种多功能的带壳壳碳质衍生物平稳地促进了多硫化物的“固定化-扩散-转化-沉积”过程。所制得的硫阴极显示出显着改善的电化学性能，并具有1140 mA hg的高初始放电比容量在0.2C下s -1和在1C下进行400次循环后s -1的高保留率769 mA hg s -1，表明其对硫的利用率高，并有效地抑制了“穿梭效应”。
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