Solvent mediated morphology control of zinc MOFs as carbon templates for application in supercapacitors

Hwang, Jongkook; Yan, Runyu; Oschatz, Martin; Schmidt, Bernhard V. K. J.

doi:10.1039/c8ta07700b

Cited by 72 publications

(65 citation statements)

References 64 publications

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“…The Zn 2 GeO 4 -EG and Zn 2 GeO 4 -TEA possessed a uniform rodlike morphology ( Figure 2B,C), and it is obviously that the length of Zn 2 GeO 4 -EG is greatly longer than that of Zn 2 GeO 4 -TEA. The different morphologies of Zn 2 GeO 4 are probably resulted from the various polarity and solubility of different solvents, which greatly influence the nucleation and growth process, as also have been reported in the previous reference 26,35 . The different morphologies of Zn 2 GeO 4 are probably resulted from the various polarity and solubility of different solvents, which greatly influence the nucleation and growth process, as also have been reported in the previous reference 26,35 .…”

Section: Phase and Microstructure Characterizationssupporting

confidence: 56%

“…The different morphologies of Zn 2 GeO 4 are probably resulted from the various polarity and solubility of different solvents, which greatly influence the nucleation and growth process, as also have been reported in the previous reference 26,35 . 26 Typical morphologies of pure g-C 3 N 4 and g-C 3 N 4 / Zn 2 GeO 4 photocatalysts are further investigated and provided in Figure 3. The similar crystallization behavior of metal-organic framework (MOF) depending on various polarities of solvents has been observed, 26 in which process the polarity solvent is helpful to obtain hexagonal phase, whereas the low solvent polarity is tend to obtain tetragonal phase during the synthesis.…”

Section: Phase and Microstructure Characterizationssupporting

confidence: 56%

“…As shown in Figure 2D, when using triethanolamine as solvent, the resultant Zn 2 GeO 4 -TEOA product showed a cluster-like morphology assembled from rod-like Zn 2 GeO 4 structure with a diameter of approximately 200-300 nm and a length of about 1 μm. The similar crystallization behavior of metal-organic framework (MOF) depending on various polarities of solvents has been observed, 26 in which process the polarity solvent is helpful to obtain hexagonal phase, whereas the low solvent polarity is tend to obtain tetragonal phase during the synthesis. Thus, considering the fact that the TEOA, DETA, and TEA are more basic than EG, the sample prepared in EG has greater length-diameter ratio.…”

Section: Phase and Microstructure Characterizationsmentioning

confidence: 75%

“…Moreover, g-C 3 N 4 has been demonstrated to be an excellent substrate material for fabricating heterojunction photocatalysts, and many g-C 3 N 4 -based photocatalysts, composites including ZnO-C 3 N 4 , 17 BiVO 4 -C 3 N 4 , 18 TiO 2 -C 3 N 4 , 19 and BiOX-C 3 N 4 (X = Br, or I) 20,21 have been developed and used to degrade organic pollutants. [25][26][27][28] We demonstrated here the morphology evolution of Zn 2 GeO 4 particles under different solvothermal conditions, as well as the mass ratio of the components toward the optimization of the photocatalytic activity of g-C 3 N 4 /Zn 2 GeO 4 hybrids. Meanwhile, morphologycontrolled synthesis of semiconductor has been demonstrated to be another effective strategy in promoting photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…[22][23][24] The reaction medium of solvents with different polarity and solubility greatly influence the growth behaviors of crystalline materials. [25][26][27][28] We demonstrated here the morphology evolution of Zn 2 GeO 4 particles under different solvothermal conditions, as well as the mass ratio of the components toward the optimization of the photocatalytic activity of g-C 3 N 4 /Zn 2 GeO 4 hybrids. Methylene blue (MB) was selected as the typical contaminant to evaluate the photocatalytic performance of composites.…”

Section: Introductionmentioning

confidence: 99%

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Effects of solvent‐induced morphology evolution of Zn₂GeO₄ on photocatalytic activities of g‐C₃N₄/Zn₂GeO₄ composites

Liu

et al. 2019

J Am Ceram Soc

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Morphology modulation of photocatalyst has been demonstrated to be a crucial strategy for improving the catalytic performance in solar energy conversion system. Here we systematically investigated the influence of the solvent-dependent morphology evolution of Zn 2 GeO 4 phase on the photocatalytic efficiency of the as-prepared g-C 3 N 4 /Zn 2 GeO 4 composites. The morphologies of Zn 2 GeO 4 were rationally tuned from flower-like nanosheets to length-controllable nanorods, and microclusters assembled from microrods through regulating the solution polarity of different organic solvents. Accordingly, the Zn 2 GeO 4 sample prepared in ethylene glycol (EG) with long rod-like morphology and integrated with g-C 3 N 4 , abbreviated as g-C 3 N 4 / Zn 2 GeO 4 (1:1)-EG, exhibited the best visible-light absorption ability and the highest efficiency. The synergetic effect of the long rod-like Zn 2 GeO 4 phase with many exposed (110) crystalline facets and g-C 3 N 4 accelerates the separation and interface transportation of photoexcited charge carriers, as confirmed by photocurrent measurements. The MB degradation mechanism was also proposed to clarify the chargetransfer process and the improved photodegradation activity. This study offers an experimental basis for understanding the significance of morphology control on rational design of photocatalysts with improved performance. K E Y W O R D Sdegradation, photocatalysis, photoreaction, Zn 2 GeO 4 6518 | PEI Et al.

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Section: Phase and Microstructure Characterizationssupporting

confidence: 56%

Section: Phase and Microstructure Characterizationssupporting

confidence: 56%

Section: Phase and Microstructure Characterizationsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of solvent‐induced morphology evolution of Zn₂GeO₄ on photocatalytic activities of g‐C₃N₄/Zn₂GeO₄ composites

Liu

et al. 2019

J Am Ceram Soc

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From Molecular Precursors to Nanoparticles—Tailoring the Adsorption Properties of Porous Carbon Materials by Controlled Chemical Functionalization

Perovic

Qin

Oschatz

2020

Adv Funct Materials

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Nanoporous carbon materials (NCMs) provide the "function" of high specific surface area and thus have large interface area for interactions with surrounding species, which is of particular importance in applications related to adsorption processes. The strength and mechanism of adsorption depend on the pore architecture of the NCMs. In addition, chemical functionalization can be used to induce changes of electron density and/or electron density distribution in the pore walls, thus further modifying the interactions between carbons and guest species. Typical approaches for functionalization of nanoporous materials with regular atomic construction like porous silica, metal-organic frameworks, or zeolites, cannot be applied to NCMs due to their less defined local atomic construction and abundant defects. Therefore, synthetic strategies that offer a higher degree of control over the process of functionalization are needed. Synthetic approaches for covalent functionalization of NCMs, that is, for the incorporation of heteroatoms into the carbon backbone, are critically reviewed with a special focus on strategies following the concept "from molecules to materials." Approaches for coordinative functionalization with metallic species, and the functionalization by nanocomposite formation between pristine carbon materials and heteroatom-containing carbons, are introduced as well. Particular focus is given to the influences of these functionalizations in adsorption-related applications.

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2D Metal–Organic Framework Cu₃(HHTT)₂ Films for Broadband Photodetectors from Ultraviolet to Mid‐Infrared

et al. 2022

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conventional MOFs precludes them from optoelectronic applications. [12] Recently, a new type of MOFs, namely 2D conjugated MOFs (2D c-MOFs), exhibit not only unique properties of conventional MOFs like high porosity and tailorability of crystal structure but also outstanding electrical transport properties due to high in-plane-π-conjugation and compact interlayer π-π stacking in their crystals. [2,13] Recently, various electronic devices based on 2D c-MOF thin films have been developed, such as field-effect transistors, [14][15][16] supercapacitors, [17] chemiresistors, [8,18] and batteries. [10,19] Various 2D c-MOFs thin films can be grown based on different bottom-up schemes, such as layer-by-layer assembly, liquid-air interface, liquidliquid interface, and face-to-face confined growth. [14,20,21] 2D c-MOF Cu 3 (HHTT) 2 (HHTT: 2,3,7,8,12,13-hexahydroxy tetraazanaphthotetraphene) has been reported to be an efficient electrocatalyst for CO 2 reduction and electrode materials for Li storage, [2,6,22] which features excellent in-plane and out-of-plane crystallinity due to the large ligand core with heteroatoms. The 2D c-MOF is expected to have high conductivity because of efficient in-plane d-π conjugations and strong interlayer π-π interactions. [2] However, the preparation of Cu 3 (HHTT) 2 thin films has never been reported until now, which prohibits the study of its transport mechanisms and applications in thin-film electronic devices.Traditional photodetectors based on Si and typical III-V semiconductors suffer from high fabrication cost, narrow detection range, and fragility. [23] Therefore, photodetectors with broadband detectable range, mechanical flexibility, and convenient fabrication are highly desirable for many emerging applications like wearable electronics and medical imaging. On the other hand, optical synapse, which can receive external optical stimuli and transform the signal to postsynaptic current, is an essential building block of highly efficient neuromorphic computing, which cannot be realized based on conventional semiconductor photodetectors. [24] Considering the high tunability of their optoelectronic properties, 2D c-MOFs must have tremendous potential for these applications, which have been rarely reported until now. [21,25] In this work, wafer-scale Cu 3 (HHTT) 2 thin films are prepared by a convenient layer-by-layer solution growth technique for the first time. By optimizing the growth conditions such Cu 3 (HHTT) 2 (HHTT: 2,3,7,8,12,13-hexahydroxytetraazanaphthotetraphene) is a novel 2D conjugated metal-organic framework (2D c-MOF) with efficient in-plane d-π conjugations and strong interlayer π-π interactions while the growth of Cu 3 (HHTT) 2 thin films has never been reported until now. Here, the successful fabrication of highly oriented wafer-scale Cu 3 (HHTT) 2 thin films with a layer-by-layer growth method on various substrates is presented. Its semiconducting behavior and carrier transport mechanisms are clarified through temperature and frequency-dependent conductivity measureme...

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Solvent mediated morphology control of zinc MOFs as carbon templates for application in supercapacitors

Abstract: A simple yet effective solvent mediated synthesis of nano-MOF with controlled polymorphism, size and morphology under ambient conditions is presented.

Cited by 72 publications

References 64 publications

Effects of solvent‐induced morphology evolution of Zn₂GeO₄ on photocatalytic activities of g‐C₃N₄/Zn₂GeO₄ composites

Effects of solvent‐induced morphology evolution of Zn₂GeO₄ on photocatalytic activities of g‐C₃N₄/Zn₂GeO₄ composites

From Molecular Precursors to Nanoparticles—Tailoring the Adsorption Properties of Porous Carbon Materials by Controlled Chemical Functionalization

2D Metal–Organic Framework Cu₃(HHTT)₂ Films for Broadband Photodetectors from Ultraviolet to Mid‐Infrared

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Solvent mediated morphology control of zinc MOFs as carbon templates for application in supercapacitors

Abstract: A simple yet effective solvent mediated synthesis of nano-MOF with controlled polymorphism, size and morphology under ambient conditions is presented.

Cited by 72 publications

References 64 publications

Effects of solvent‐induced morphology evolution of Zn2GeO4 on photocatalytic activities of g‐C3N4/Zn2GeO4 composites

Effects of solvent‐induced morphology evolution of Zn2GeO4 on photocatalytic activities of g‐C3N4/Zn2GeO4 composites

From Molecular Precursors to Nanoparticles—Tailoring the Adsorption Properties of Porous Carbon Materials by Controlled Chemical Functionalization

2D Metal–Organic Framework Cu3(HHTT)2 Films for Broadband Photodetectors from Ultraviolet to Mid‐Infrared

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Effects of solvent‐induced morphology evolution of Zn₂GeO₄ on photocatalytic activities of g‐C₃N₄/Zn₂GeO₄ composites

Effects of solvent‐induced morphology evolution of Zn₂GeO₄ on photocatalytic activities of g‐C₃N₄/Zn₂GeO₄ composites

2D Metal–Organic Framework Cu₃(HHTT)₂ Films for Broadband Photodetectors from Ultraviolet to Mid‐Infrared