Two-dimensional polymer nanosheets for efficient energy storage and conversion

Ren, Yumei; Yu, Chengbing; Chen, Zhonghui; Xu, Yuxi

doi:10.1007/s12274-020-2976-5

Cited by 28 publications

(30 citation statements)

References 105 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fourier transform infrared (FT-IR) spectra were recorded on Bruker Vertex 70. 13 C (125 MHz) cross-polarization magic-angle spinning (CP-MAS) NMR experiments were recorded on a Bruker Advance 500 spectrometer equipped with a magic-angle spin probe in a 4-mm ZrO2 rotor. Surface chemistry and composition analysis of the samples were examined with a model 250XI XPS spectrometer equipped with a mono Al Kα X-ray source (1,361 eV).…”

Section: Characterizationsmentioning

confidence: 99%

“…Conjugated microporous polymers (CMPs) are a series of macromolecules with π-conjugated three-dimensional (3D) networks consisting of building blocks via covalent bonds [1,2]. Since the first synthesis of CMPs by Sonogashira-Hagihara coupling [3] of halogen and alkyne monomers in 2007 [4], CMPs have emerged as one of the most promising materials applied in many fields [5,6], including luminescent materials [7,8], heterogeneous catalysis [9,10], energy storage [11][12][13], environmental remediation [14][15][16] and, particularly, removal of heavy metal ions [17,18]. CMPs generally show advantages in terms of task-specific designability [19], benign synthesis, and controlled porosity [20].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

De novo synthesis of bifunctional conjugated microporous polymers for synergistic coordination mediated uranium entrapment

Zhang

et al. 2020

Nano Res.

View full text Add to dashboard Cite

This work reports a de novo synthesis of novel bifunctional conjugated microporous polymers (CMPs) exhibiting a synergistic-effect involved coordination behavior to uranium. It is highlighted that the synthetic strategy enables the engineering of the coordination environment within amidoxime functionalized CMP frameworks by specifically introducing ortho-substituted amino functionalities, enhancing the affinity to uranyl ions via forming synergistic complexes. The CMPs exhibit high Brunauer-Emmett-Teller (BET) surface area, well-developed three-dimensional (3D) networks with hierarchical porosity, and favorable chemical and thermal stability because of the covalently cross-linked structure. Compared with the amino-free counterparts, the adsorption capacity of bifunctional CMPs was increased by almost 70%, from 105 to 174 mg/g, indicating evidently enhanced binding ability to uranium. Moreover, new insights into coordination mechanism were obtained by in-depth X-ray photoelectron spectroscopy (XPS) analysis and density functional theory (DFT) calculation, suggesting a dominant role of the oxime ligands forming a 1:1 metal ions/ligands (M/L) coordination model with uranyl ions while demonstrating the synergistic engagement of the amino functionalities via direct binding to uranium center and hydrogen-bonding involved secondary-sphere interaction. This work sheds light on the underlying principles of ortho-substituted functionalities directed synergistic effect to promote the coordination of amidoxime with uranyl ions. And the synthetic strategy established here would enable the task-specific development of more novel CMP-based functional materials for broadened applications.

show abstract

Section: Characterizationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

De novo synthesis of bifunctional conjugated microporous polymers for synergistic coordination mediated uranium entrapment

Zhang

et al. 2020

Nano Res.

View full text Add to dashboard Cite

show abstract

“…[1] In the light of promoting efficient, safe, and low-polluting electrochemical energy storage systems, [2] electroactive organic materials (EOMs) have sparked considerable attention in recent compounds, [53] and the most recently reported N-substituted salts of viologen derivatives. [52] Since 2008 (a year witnessed as the modern area revival of EOMs), dozens of review articles have been published from different perspectives (e.g., molecular design, [20,22,23,27,41,42,49,50,[54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69] sustainability, [70,71] opportunity, [3,[72][73][74] practicability, [75][76][77][78] and technology [79][80][81][82] ). It is worth noting that most reviews are focused on OPEMs with less consideration to ONEMs, except two reviews dedicated to ONEMs for Na/K-ion batteries, [37,83] yet presenting only a summary of advances and no critical discussion or suggested solutions for remai...…”

Section: Introductionmentioning

confidence: 99%

Organic Negative Electrode Materials for Metal‐Ion and Molecular‐Ion Batteries: Progress and Challenges from a Molecular Engineering Perspective

Lakraychi

Dolhem

Vlad

et al. 2021

Advanced Energy Materials

View full text Add to dashboard Cite

Thanks to their versatility and flexibility, EOMs have shown broad applicability as bulky solid [3] or dissolved [4,5] active material, in aqueous [6][7][8] or non-aqueous electrolyte, [9][10][11] for portable and stationary batteries, respectively. In practice, OEMs are explored as main active materials in LIBs, [12] beyond Li systems (e.g., hydrogen, [13,14] Na-ion, [15][16][17][18][19] K-ion, [20][21][22][23][24] and multivalent batteries like magnesium, [25,26] zinc, [27] or aluminum [28,29] ) and also redox flow batteries; [30] or as supporting active materials such as redox mediators for Li-O 2 batteries, [31] Li-source sacrificial materials for Li-ion capacitor [32] and redox electrolytes for high-energy supercapacitors. [33] In contrast to the state-of-the-art inorganic materials, whose reactivity is based on redox of transition metal center and consequently Li + de/insertion, [34,35] the redox reaction of EOMs is based on the charge state change of the redox moiety, [12] for which the charge compensation during redox can be either made by cations, referring to n-type systems, or by anions, belonging then to p-type system, according to the proposed Hünig's classification. [36,37] The richness of organic chemistry coupled with molecular modifications have provided thus far a plethora of molecules and architectures operating within a large potential window with high specific capacities, extended cycling stability and high cycling rate. This has enabled building a broad database of electroactive compounds for both positive and negative electrode applications. Organic positive electrode materials (OPEMs) certainly benefit from larger attention since there are more possibilities to explore, for example, conducting polymers, [38,39] nitroxides, and other stable organic radicals, [40][41][42][43] sulfur compounds, [11] as well as conjugated amines, [44][45][46] conjugated sulfonamides, [47] nitro-aromatics, [48] and carbonyls. [49,50] The latter being certainly the most explored category owing to major advances attained so far but also to opportunities for further improvements to attain simultaneously high energy and power densities combined with good cycling stability. [12] On the opposite side, the chemical library is less rich for organic negative electrode materials (ONEMs), primarily due to much focus on positive electrode chemistries, for which many issues and strategies are to be addressed and explored, respectively. Today, the ONEMs database counts fewer redox families as OPEMs one, with also less specific chemistries within each class. To cite some: the most studied conjugated dicarboxylates, [51] Hückel-stabilized Schiff base, [52] nitrogen-redox azo

show abstract

“…[2] Over the past few years, metal-free 2D nanosheets have rapidly developed as promis-ing candidates for visible-light driving water splitting due to their nontoxicity,s tructural designability and high chemical stability. [3] Nevertheless,one critical problem associated with these nanosheets,particularly for the monolayer or few-layer nanosheets is their obviously enlarged band gap and narrowed visible-light responsive range because of the quantum confinement effect, thus greatly limiting further improvement of photocatalytic water splitting efficiency. [2a, 4] In order to surmount this challenge,o nly very limited approaches have been proposed to extend the visible-light responsive range for ultrathin nanosheets.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Crystalline Covalent‐Triazine‐Framework Nanosheets with Electron Donor Groups for Synergistically Enhanced Photocatalytic Water Splitting

et al. 2021

Self Cite

View full text Add to dashboard Cite

Ultrathin nanosheets have great potential for photocatalytic applications,however,suffer from enlarged band gap and narrowed visible-light-responsive range due to the quantum confinement effect. Herein, we report an ovel redox strategy for efficient preparation of ultrathin crystalline amidefunctionalizedc ovalent-triazine-framework nanosheets (CTF NSs) with enhanced visible light absorption. The CTF NSs exhibited photocatalytic hydrogen (512.3 mmol h À1 )a nd oxygen (12.37 mmol h À1 )e volution rates much higher than that of pristine bulk CTF.Photocatalytic overall water splitting could be achieved with efficient stoichiometric H 2 (5.13 mmol h À1 ) and O 2 (2.53 mmol h À1 )e volution rates under visible light irradiation. Experimental and theoretical analysis revealed that introduction of amide groups as electron donor optimized the band structure and improve its visible-light absorption, hydrophilicity and carrier separation efficiency,thus resulting in the enhanced photocatalytic performance.The well-dispersed CTF NSs could be easily cast onto asupport as athin film device and demonstrate excellent photocatalytic activity (25.7 mmol h À1 m À2 for hydrogen evolution).

show abstract

Two-dimensional polymer nanosheets for efficient energy storage and conversion

Cited by 28 publications

References 105 publications

De novo synthesis of bifunctional conjugated microporous polymers for synergistic coordination mediated uranium entrapment

De novo synthesis of bifunctional conjugated microporous polymers for synergistic coordination mediated uranium entrapment

Organic Negative Electrode Materials for Metal‐Ion and Molecular‐Ion Batteries: Progress and Challenges from a Molecular Engineering Perspective

Ultrathin Crystalline Covalent‐Triazine‐Framework Nanosheets with Electron Donor Groups for Synergistically Enhanced Photocatalytic Water Splitting

Contact Info

Product

Resources

About