Carboxylated carbon quantum dot-induced binary metal–organic framework nanosheet synthesis to boost the electrocatalytic performance

Song, Daqi; Guo, Huazhang; Huang, Kai; Zhang, Huiyi; Chen, Jia; Wang, Liang; Lian, Cheng; Wang, Yong

doi:10.1016/j.mattod.2022.02.011

Cited by 95 publications

(56 citation statements)

References 48 publications

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“…In comparison to the CDs, the pyridinic N atom content of the Co-CDs significantly increases from 4.2 to 11.27 at%, which indicates that the Co element in the precursor is advantageous in forming more pyridinic-N-active sites for boosting the ORR performance [ 46 ]. Among them, the graphite N content of Co-CDs@CB is the highest, which is conducive to the enhancement of the limiting current density of the catalyst towards the ORR and agrees with their XRD results [ 47 , 48 ]. In Figure 2 d, the O spectra can be separated into C=O and C-O at 531 and 532.8 eV.…”

Section: Resultssupporting

confidence: 82%

Construction of Co,N-Coordinated Carbon Dots for Efficient Oxygen Reduction Reaction

et al. 2022

Molecules

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For the sake of the oxygen reduction reaction (ORR) catalytic performance, carbon dots (CDs) doped with metal atoms have accelerated their local electron flow for the past few years. However, the influence of CDs doped with metal atoms on binding sites and formation mechanisms is still uncertain. Herein, Co,N-doped CDs were facilely prepared by the low-temperature polymerization–solvent extraction strategy from EDTA-Co. The influence of Co doping on the catalytic performance of Co-CDs was explored, mainly in the following aspects: first, the pyridinic N atom content of Co-CDs significantly increased from 4.2 to 11.27 at% compared with the CDs, which indicates that the Co element in the precursor is advantageous in forming more pyridinic-N-active sites for boosting the ORR performance. Second, Co-CDs are uniformly distributed on the surface of carbon black (CB) to form Co-CDs@CB by the facile hydrothermal route, which can expose more active sites than the aggregation status. Third, the highest graphite N content of Co-CDs@CB was found, by limiting the current density of the catalyst towards the ORR. Composite nanomaterials formed by Co and CB are also used as air electrodes to manufacture high-performance zinc–air batteries. The battery has good cycle stability and realizes stable charges and discharges under different current densities. The outstanding catalytic activity of Co-CDs@CB is attributed to the Co,N synergistic effect induced by Co doping, which pioneer a new metal doping mechanism for gaining high-performance electrocatalysts.

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Section: Resultssupporting

confidence: 82%

Construction of Co,N-Coordinated Carbon Dots for Efficient Oxygen Reduction Reaction

et al. 2022

Molecules

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“…Recently, platinum-based catalysts are regarded as the preferred and widely used catalysts due to their high activity leading to water as the final product via four electrons transfer. − However, platinum-based catalysts are also confronted with a series of problems, including the low reserves and high cost of platinum, poor stability, and antipoisoning ability, which hamper commercialization of FCs and other related energy storage devices . With regards to this, extensive studies have been dedicated to design substitutes with high performance, outstanding stability, and cheap, such as non-noble metal and nonmetal catalysts. − In particular, those highly active metal–nitrogen-doped carbon (M–N-C) have been seen as potential catalysts to catch up with platinum-based catalysts. − …”

Section: Introductionmentioning

confidence: 99%

Efficient Synthesis of Fe/N-Doped Carbon Nanotube as Highly Active Catalysts for Oxygen Reduction Reaction in Alkaline Media

Zhang

Tang

et al. 2022

Langmuir

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It is of significant implication to fabricate high-performance, durable and low-cost catalysts toward to oxygen reduction reaction (ORR) to drive commercial application of fuel cells. In our work, we synthesize the Fe/N-CNT catalyst via one-pot grinding combined with calcination using a mixture of carbamide, CNTs and iron salts as precursors, the as-synthesized catalysts show the structure that Fe nanoparticles are encapsulated in the tube of intertwined CNTs with abundant active sites. The catalyst is synthesized at 800 °C (Fe/N-CNT-800–20) obtain high graphitization degree and high N doped content, especially the high content and proportion of Fe–N and pyridinic-N, exhibiting outstanding ORR activity. Moreover, too high calcination temperature (850 °C) and high Fe content (25%) lead to the agglomeration of Fe during the calcination, which blocked some catalytic sites, leading to poor ORR activity. This facile synergy route will provide new thoughts for the fabrication and optimization of catalysts.

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Section: Introductionmentioning

confidence: 99%

“…Bi-metal-organic frameworks (MOFs) with large surface areas, tunable pore sizes, and abundant metal and organic linkers in the backbone are ideal candidates for preparing porous carbon templates. 18 Among them, an iron/zinc-based zeolitic imidazolium framework (Fe/Zn-ZIF) has attracted more and more attention. 19–22 The reasons for this attention include: (1) the low Zn boiling point (907 °C) enables evaporation and formation of a porous structure at temperatures above 800 °C; (2) the addition of Zn enlarges the adjacent distance of Fe and acts as a “fence” to avoid aggregation during pyrolysis; (3) N-rich organic ligands in the ZIF precursor act as “coordinators” to protect and stabilize Fe atoms in nitrogen-doped carbon.…”

Section: Introductionmentioning

confidence: 99%

Activating bimetallic ZIF-derived polymers using facile steam-etching for the ORR

et al. 2022

New J. Chem.

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Carboxylated carbon quantum dot-induced binary metal–organic framework nanosheet synthesis to boost the electrocatalytic performance

Cited by 95 publications

References 48 publications

Construction of Co,N-Coordinated Carbon Dots for Efficient Oxygen Reduction Reaction

Construction of Co,N-Coordinated Carbon Dots for Efficient Oxygen Reduction Reaction

Efficient Synthesis of Fe/N-Doped Carbon Nanotube as Highly Active Catalysts for Oxygen Reduction Reaction in Alkaline Media

Activating bimetallic ZIF-derived polymers using facile steam-etching for the ORR

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