Superior Oxygen Evolution Electrocatalyst based on Ni‐Ellagic Acid Coordination Polymer DOI
Rui‐Lin Chai, Qian Zhao, Jie Li

и другие.

Advanced Energy Materials, Год журнала: 2024, Номер 14(27)

Опубликована: Май 11, 2024

Abstract The oxygen evolution reaction (OER) is central to energy conversion technologies, but the high cost and scarcity of commercial noble metal catalysts limit their widespread application. Natural products exhibit great potential in preparing high‐performance electrocatalysts due cost‐effectiveness sustainability. Here, a kind 1D polymers [M‐EA (M═Co, Cu, Ni)] for via complexation ellagic acid (EA) with ions are reported. It found that Ni‐EA displays low overpotential (190 mV at 10 mA cm −2 ) an ultralow Tafel slope (28 dec −1 ), production only 3.6 × % IrO 2 . Density functional theory investigations reveal electrocatalytic mechanism OER. A rechargeable Zn‐Air battery using Ni‐EA+Pt/C as air electrode shows lower charging better cycling stability than +Pt/C‐based battery. This work provides train development state‐of‐the‐art OER catalysts.

Язык: Английский

Isomeric Oligo(Phenylenevinylene)‐Based Covalent Organic Frameworks with Different Orientation of Imine Bonds and Distinct Photocatalytic Activities DOI Open Access
Wenbo Dong,

Zhiying Qin,

Kuixing Wang

и другие.

Angewandte Chemie International Edition, Год журнала: 2022, Номер 62(5)

Опубликована: Дек. 1, 2022

Imine-linked covalent organic frameworks (COFs) have been extensively studied in photocatalysis because of their easy synthesis and excellent crystallinity. The effect imine-bond orientation on the photocatalytic properties COFs, however, is still rarely studied. Herein, we report two novel COFs with different orientations imine bonds using oligo(phenylenevinylene) moieties. showed similar structures but great differences photoelectric properties. COF-932 demonstrated a superior hydrogen evolution performance compared to COF-923 when triethanolamine was used as sacrificial agent. Interestingly, use ascorbic acid led protonation further altering direction electron transfer. performances were increased 23.4 0.73 mmol g-1 h-1 for protonated COF-932, respectively. This study provides clear strategy design imine-linked COF-based photocatalysts advances development COFs.

Язык: Английский

Процитировано

89
Photocatalytic systems: reactions, mechanism, and applications DOI Creative Commons
Farzaneh Mohamadpour, Ali Mohammad Amani

RSC Advances, Год журнала: 2024, Номер 14(29), С. 20609 - 20645

Опубликована: Янв. 1, 2024

The photocatalytic field revolves around the utilization of photon energy to initiate various chemical reactions using non-adsorbing substrates, through processes such as single electron transfer, or atom transfer.

Язык: Английский

Процитировано

85
Covalent organic frameworks for CO2 capture: from laboratory curiosity to industry implementation DOI
He Li,

Akhil Dilipkumar,

Saifudin Abubakar

и другие.

Chemical Society Reviews, Год журнала: 2023, Номер 52(18), С. 6294 - 6329

Опубликована: Янв. 1, 2023

Synergistic developments of covalent organic frameworks and engineering processes can expedite the qualitative leap for net-zero carbon emissions.

Язык: Английский

Процитировано

77
Kilogram-Scale Fabrication of a Robust Olefin-Linked Covalent Organic Framework for Separating Ethylene from a Ternary C2 Hydrocarbon Mixture DOI
Zhifang Wang, Yushu Zhang, En Lin

и другие.

Journal of the American Chemical Society, Год журнала: 2023, Номер 145(39), С. 21483 - 21490

Опубликована: Сен. 22, 2023

One-step adsorptive purification of ethylene (C2H4) from a ternary mixture acetylene (C2H2), C2H4, and ethane (C2H6) by single material is great importance but challenging in the petrochemical industry. Herein, chemically robust olefin-linked covalent organic framework (COF), NKCOF-62, designed synthesized melt polymerization method employing tetramethylpyrazine terephthalaldehyde as cheap monomers. This avoids most disadvantages classical solvothermal methods, which enable cost-effective kilogram fabrication COFs one pot. Furthermore, NKCOF-62 shows remarkably selective adsorption C2H2 C2H6 over C2H4 thanks to its unique pore environments suitable size. Breakthrough experiments demonstrate that polymer-grade can be directly obtained C2H2/C2H6/C2H4 (1/1/1) mixtures through separation process. Notably, first demonstration potential use for separation, provides blueprint design construction industrial gas separations.

Язык: Английский

Процитировано

67
Crystallization of Dimensional Isomers in Covalent Organic Frameworks DOI
Bo Gui, Junjie Xin, Yuanpeng Cheng

и другие.

Journal of the American Chemical Society, Год журнала: 2023, Номер 145(20), С. 11276 - 11281

Опубликована: Май 11, 2023

Dimensional isomers, defined in reticular chemistry as frameworks consisting of identical molecular building blocks but extended two or three dimensions (2D 3D), are an important type framework isomers that have never been isolated. Herein, we report the crystallization dimensional covalent organic (COFs) for first time. By polymerization same at different temperatures, both 2D and 3D COFs were successfully constructed due to temperature-induced conformational changes precursors from planar tetrahedral. In addition, non-fluorescent COF can be gradually converted into fluorescent by increasing temperature under solvothermal conditions. Therefore, it is reasonable crystallize materials controlling conformation blocks, more examples expected. Since obtained show properties functions, this work will definitely motivate us design target applications future.

Язык: Английский

Процитировано

66
Structural Motifs in Covalent Organic Frameworks for Photocatalysis DOI

Liyang Qin,

Chengdi Ma,

Jian Zhang

и другие.

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Март 10, 2024

Abstract Covalent organic frameworks (COFs) attract significant attention due to their ordered, crystalline, porous, metal‐free, and predictable structures. These unique characteristics offer great opportunities for the diffusion transmission of photogenerated charges during photocatalysis. Currently, a considerable number COFs are used as metal‐free semiconductor photocatalysts. This review aims understand relationships between structure photocatalysis performance provides in‐depth insight into synthetic strategy improve performance. Subsequently, focuses on structural motif in sustainable photocatalytic hydrogen evolution, carbon dioxide reduction, peroxide generation, compound transformations. Last, conjunction with progress achieved challenges yet be overcome, candid discussion is undertaken regarding field COF photocatalysis, accompanied by presentation potential research avenues future directions. seeks provide readers comprehensive understanding pivotal role robust guidance innovative utilization

Язык: Английский

Процитировано

66
Dual Microenvironment Modulation of Pd Nanoparticles in Covalent Organic Frameworks for Semihydrogenation of Alkynes DOI Open Access

Mingchun Guo,

Qiangqiang Meng, Wenyao Chen

и другие.

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(26)

Опубликована: Май 2, 2023

The chemical microenvironment modulation of metal nanoparticles (NPs) holds promise for tackling the long-lasting challenge trade-off effect between activity and selectivity in catalysis. Herein, ultrafine PdCu2 NPs incorporated into covalent organic frameworks (COFs) with diverse groups on their pore walls have been fabricated semihydrogenation alkynes. Cu species, as primary Pd active sites, greatly improves selectivity. functional secondary around effectively regulate activity, which encapsulated COF bearing -CH3 exhibit highest >99 % conversion 97 Both experimental calculation results suggest that group affects electron-donating ability COFs, successively impacts charge transfer COFs giving rise to a modulated electronic state excellent catalytic performance.

Язык: Английский

Процитировано

64
Modulating the Interlayer Stacking of Covalent Organic Frameworks for Efficient Acetylene Separation DOI
Zhifang Wang, Yushu Zhang, Ting Wang

и другие.

Small, Год журнала: 2023, Номер 19(32)

Опубликована: Май 16, 2023

Controllable modulation of the stacking modes 2D (two-dimensional) materials can significantly influence their properties and functionalities but remains a formidable synthetic challenge. Here, an effective strategy is proposed to control layer imide-linked covalent organic frameworks (COFs) by altering methods. Specifically, modulator-assisted method afford COF with rare ABC without need for any additives, while solvothermal synthesis leads AA stacking. The variation interlayer influences chemical physical properties, including morphology, porosity, gas adsorption performance. resultant shows much higher C2 H2 capacity selectivity over CO2 H4 than stacking, which not demonstrated in field yet. Furthermore, outstanding practical separation ability confirmed breakthrough experiments /CO2 (50/50, v/v) /C2 (1/99, v/v), selectively remove good recyclability. This work provides new direction produce COFs controllable modes.

Язык: Английский

Процитировано

44
Efficient Photocatalytic CO2 Reduction in Ellagic Acid–Based Covalent Organic Frameworks DOI

Wan Lin,

Fu‐Wen Lin,

Jing Lin

и другие.

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(23), С. 16229 - 16236

Опубликована: Май 30, 2024

Employing covalent organic frameworks (COFs) for the photocatalytic CO2 reduction reaction (CDRR) to generate high-value chemical fuels and mitigate greenhouse gas emissions represents a sustainable catalytic conversion approach. However, achieving superior CDRR performance is hindered by challenges of low charge separation efficiency, poor stability, high preparation costs associated with COFs. Herein, in this work, we utilized perfluorinated metallophthalocyanine (MPcF16) biomolecule compound ellagic acid (EA) as building blocks actualize functional named EPM-COF (M = Co, Ni, Cu). The designed EPCo-COF, featuring cobalt metal active sites, demonstrated an impressive CO production rate selectivity (CDRR). Moreover, following alkaline treatment (EPCo-COF-AT), COF exposed carboxylic anion (COO–) hydroxyl group (OH), thereby enhancing electron-donating capability EA. This modification achieved heightened 17.7 mmol g–1 h–1 outstanding 97.8% efficient CDRR. Theoretical calculations further illustrated that EPCo-COF-AT functionalized COO– OH can effectively alleviate energy barriers involved process, which facilitates proton-coupled electron transfer processes enhances on sites within EPCo-COF-AT.

Язык: Английский

Процитировано

40
Three-dimensional covalent organic frameworks with nia nets for efficient separation of benzene/cyclohexane mixtures DOI Creative Commons

Jianhong Chang,

Fengqian Chen, Hui Li

и другие.

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Янв. 27, 2024

Abstract The synthesis of three-dimensional covalent organic frameworks with highly connected building blocks presents a significant challenge. In this study, we report two 3D COFs the nia topology, named JUC-641 and JUC-642, by introducing planar hexagonal triangular prism nodes. Notably, our adsorption studies breakthrough experiments reveal that both exhibit exceptional separation capabilities, surpassing previously reported most porous polymers, factor up to 2.02 for benzene cyclohexane. Additionally, dispersion-corrected density functional theory analysis suggests good performance these can be attributed incorporation aromatic presence extensive pore structures. Consequently, research not only expands diversity but also highlights potential COF materials as promising candidates environmentally-friendly applications.

Язык: Английский

Процитировано

28