In situ growth CNT@MOFs core—shell structures enabling high specific supercapacitances in neutral aqueous electrolyte

Lu, Mingxia; Wang, Gang; Yang, Xiuhai; Hou, Bo

doi:10.1007/s12274-022-4184-y

Cited by 14 publications

(5 citation statements)

References 46 publications

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“…To further investigate the electronic structure and chemical composition of the Ni 3 (HITP) 2 , X‐ray photoelectron spectroscopy (XPS) is performed, and the result is similar to previous reports. [ 34,35 ] As shown in Figure 2e, the peaks corresponding to Ni 2p 3/2 , Ni 2p 3/2 satellites, Ni 2p 1/2 , and Ni 2p 1/2 satellites appear at the binding energies of 855.6, 861.4, 873.1, and 879.1 eV, respectively, indicating that Ni in Ni 3 (HITP) 2 is Ni 2+ . In addition, the fitted N 1s spectrum is mainly divided into three peaks with binding energies of 398.3, 399.6, and 401.0 eV, corresponding to Ni–N, graphitic‐N, and N–H, respectively (Figure 2f).…”

Section: Resultsmentioning

confidence: 97%

“…To further investigate the electronic structure and chemical composition of the Ni 3 (HITP) 2 , X-ray photoelectron spectroscopy (XPS) is performed, and the result is similar to previous reports. [34,35] As shown in Figure 2e To asssess the mechanical properties of Ni 3 (HITP) 2 -paper, tensile stress-strain tests are conducted, as shown in Figure S7a, Supporting Information. Pristine paper exhibits a tensile strength of 15.2 MPa and a breaking strain of 5.4%.…”

Section: Resultsmentioning

confidence: 99%

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Conductive Metal–Organic Framework Nanosheets Constructed Hierarchical Water Transport Biological Channel for High‐Performance Interfacial Seawater Evaporation

Qian,

Xue,

Chen

et al. 2023

Advanced Materials

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Solar interfacial water evaporation shows great potential to address the global freshwater scarcity. Water evaporation being inherently energy intensive, Joule‐heating assisted solar evaporation for addressing insufficient vapor under natural conditions is an ideal strategy. However, the simultaneous optimization of low evaporation enthalpy, high photothermal conversion, and excellent Joule‐heating steam generation within a single material remain a rare achievement. Herein, inspired by the biological channel structures, a large‐area film with hierarchical macro/microporous structures is elaborately designed by stacking the nanosheet of a conductive metal–organic framework (MOF), Ni3(HITP)2, on a paper substrate. By combining the above three features in one material, the water evaporation enthalpy reduces from 2455 J g−1 to 1676 J g−1, and the photothermal conversion efficiency increases from 13.75% to 96.25%. Benefiting from the synergistic photothermal and Joule‐heating effects, the evaporation rate achieves 2.60 kg m−2 h−1 under one sun plus input electrical power of 4 W, surpassing the thermodynamic limit and marking the highest reported value in MOF‐based evaporators. Moreover, Ni3(HITP)2‐paper exhibits excellent long‐term stability in simulated seawater, where no salt crystallization and evaporation rate degradation are observed. This design strategy for nanosheet films with hierarchical macro/microporous channels provides inspiration for electronics, biological devices, and energy applications.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Conductive Metal–Organic Framework Nanosheets Constructed Hierarchical Water Transport Biological Channel for High‐Performance Interfacial Seawater Evaporation

Qian,

Xue,

Chen

et al. 2023

Advanced Materials

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“…In the present work, a constant reaction time and flow rate of Ar/C 2 H 2 gas were adopted, and we mainly investigated the performance difference of electrode materials with or without the generation of CNT and did not further control the yield of CNT and their influence on the electrode performances. As suggested by previous reports, an optimal content of CNT may exist since the too-low content of CNT cannot provide sufficient conductive support to the electrode, while a too-high content of CNT inevitably reduces the energy storage capacity per weight [ 27 , 28 , 29 , 30 ].…”

Section: Resultsmentioning

confidence: 99%

Carbon-Encased Mixed-Metal Selenide Rooted with Carbon Nanotubes for High-Performance Hybrid Supercapacitors

et al. 2022

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Transition metal-based compounds with high theoretical capacitance and low cost represent one class of promising electrode materials for high-performance supercapacitors. However, their low intrinsic electrical conductivity impedes their capacitive effect and further limits their practical application. Rational regulation of their composition and structure is, therefore, necessary to achieve a high electrode performance. Herein, a well-designed carbon-encased mixed-metal selenide rooted with carbon nanotubes (Ni-Co-Se@C-CNT) was derived from nickel–cobalt bimetallic organic frameworks. Due to the unique porous structure, the synergistic effect of bimetal selenides and the in situ growth of carbon nanotubes, the composite exhibits good electrical conductivity, high structural stability and abundant redox active sites. Benefitting from these merits, the Ni-Co-Se@C-CNT exhibited a high specific capacity of 554.1 C g−1 (1108.2 F g−1) at 1 A g−1 and a superior cycling performance, i.e., 96.4% of the initial capacity was retained after 5000 cycles at 10 A g−1. Furthermore, a hybrid supercapacitor assembled with Ni-Co-Se@C-CNT cathode and activated carbon (AC) anode shows a superior energy density of 38.2 Wh kg−1 at 1602.1 W kg−1.

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“…For less conductive MOFs, usually supported by multi‐dentate carboxylic acid or imidazole organic linkers, it is a traditional way to prepare MOF hybrids/composites to enhance conductivity so as to improve capacitance performances of supercapacitors. Conducting polymers constantly appeared in Co MOFs, [ 136,142,197 ] Zr MOFs, [ 170,198–200 ] and Zn MOFs [ 201,202 ] besides POM hybridized Cu MOFs [ 203 ] and Co MOFs, [ 204 ] COFs hybridized Zr MOFs, [ 205 ] rGO hybridized Al MOFs [ 206 ] and Cu MOFs, [ 207,208 ] carbon nanofibers hybridized Ni MOFs, [ 209 ] CNTs hybridized Ni MOFs, [ 210 ] and sulfur‐doped graphene bimetallic CuFe MOFs. [ 211 ]…”

Section: Mof‐based Supercapasitorsmentioning

confidence: 99%

Advances of Electroactive Metal–Organic Frameworks

Cong

2023

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The preparation of electroactive metal–organic frameworks (MOFs) for applications of supercapacitors and batteries has received much attention and remarkable progress during the past few years. MOF‐based materials including pristine MOFs, hybrid MOFs or MOF composites, and MOF derivatives are well designed by a combination of organic linkers (e.g., carboxylic acids, conjugated aromatic phenols/thiols, conjugated aromatic amines, and N‐heterocyclic donors) and metal salts to construct predictable structures with appropriate properties. This review will focus on construction strategies of pristine MOFs and hybrid MOFs as anodes, cathodes, separators, and electrolytes in supercapacitors and batteries. Descriptions and discussions follow categories of electrochemical double‐layer capacitors (EDLCs), pseudocapacitors (PSCs), and hybrid supercapacitors (HSCs) for supercapacitors. In contrast, Li‐ion batteries (LIBs), Lithium‐sulfur batteries (LSBs), Lithium‐oxygen batteries (LOBs), Sodium‐ion batteries (SIBs), Sodium‐sulfur batteries (SSBs), Zinc‐ion batteries (ZIBs), Zinc–air batteries (ZABs), Aluminum‐sulfur batteries (ASBs), and others (e.g., LiSe, NiZn, H+, alkaline, organic, and redox flow batteries) are categorized for batteries.

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In situ growth CNT@MOFs core—shell structures enabling high specific supercapacitances in neutral aqueous electrolyte

Abstract: Cit a tio n fo r fin al p u blis h e d ve r sio n:Lu, Mi n gxi a, Wa n g, G a n g, Yan g, Xipi n g a n d H o u, Bo ORCID: h t t p s://o r ci d.

Cited by 14 publications

References 46 publications

Conductive Metal–Organic Framework Nanosheets Constructed Hierarchical Water Transport Biological Channel for High‐Performance Interfacial Seawater Evaporation

Conductive Metal–Organic Framework Nanosheets Constructed Hierarchical Water Transport Biological Channel for High‐Performance Interfacial Seawater Evaporation

Carbon-Encased Mixed-Metal Selenide Rooted with Carbon Nanotubes for High-Performance Hybrid Supercapacitors

Advances of Electroactive Metal–Organic Frameworks

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