MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 23
·2300381
·
IF 4.6
Zhengwei Hu,Juxuan Xie,Jiangkai Yu,Yi Zhang,Houji Cai,Yuanqing Bai,Kai Zhang,Chunchen Liu,Fei Huang,Yong Cao
The optoelectronic properties and photovoltaic performance of nonfullerene electron acceptors (NFEAs) in organic solar cells (OSCs) are greatly influenced by the rational structure regulation of the central core unit. This study introduces a novel type of six-membered fused electron-donating core containing B─N covalent bonds to construct acceptor–donor–acceptor (A–D–A)-type NFEAs. By modulating the branching alkyl chains on the nitrogen atom, two NFEAs, BN910 and BN1014, are synthesized and characterized. Both molecules exhibit strong near-infrared absorption, narrow bandgaps (≈1.45 eV), appropriate energy levels, and tunable molecular packing behaviors, positioning them as promising candidates for efficient NFEAs in OSCs. The investigation reveals that BN1014, with longer and C2-branched alkyl chains, demonstrates superior intermolecular packing and morphology within active layers, leading to enhanced exciton dissociation, improved charge transfer, and reduced charge recombination in OSCs. As a result, a power conversion efficiency (PCE) of 10.02% is achieved for D18:BN1014-based binary OSCs. Notably, BN1014 can be utilized as the third component in the D18:DT-Y6 binary system to fabricate the ternary OSCs, and a PCE of 17.65% is achieved, outperforming 17.05% of D18:DT-Y6-based binary OSCs. These findings highlight the potential of heteroarenes featuring B─N covalent bonds for constructing high-efficiency NFEAs in OSCs.
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iScience
·
2023
·Vol. 26
·期 4
·106461-106461
·
IF 5.8
Shuaibo Zhai,Jiaqi Gong,Yifei Feng,Zhongbao Que,Weiwei Mao,Xuemin He,Yannan Xie,Xing’ao Li,Liang Chu
Memristors are promising information storage devices for commercial applications because of their long endurance and low power consumption. Particularly, perovskite memristors have revealed excellent resistive switching (RS) properties owing to the fast ion migration and solution fabrication process. Here, an n-i-p type double perovskite memristor with "ITO/SnO 2 /Cs 2 AgBiBr 6 /NiO x /Ag" architecture was developed and demonstrated to reveal three resistance states because of the p-n junction electric field coupled with ion migration. The devices exhibited reliable filamentary with an on/off ratio exceeding 50. The RS characteristics remained unchanged after 1000 s read and 300 switching cycles. The synaptic functions were examined through long-term depression and potentiation measurements. Significantly, the device still worked after one year to reveal long-term stability because of the all-inorganic layers. This work indicates a novel idea for designing a multistate memristor by utilizing the p-n junction unidirectional conductivity during the forward and reverse scanning.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Minzhe Chu,Yingying Zhai,Ningzhao Shang,Peijing Guo,Chun Wang,Yongjun Gao
The monomer of sustainable chitin, N-acetylglucosamine (NAG), is fabricated into a kind of N-doped carbon material (NC-HAP-700), with the template of hydroxyapatite (HAP). NC-HAP-700 exhibits excellent electrochemical capacitance of 346 F/g at the current density of 0.5 A/g and capacitance retention of 92% after 5000 times of charge-discharge cycles, which is superior to most reported functional carbon materials. Experiments and characterizations suggest that HAP is an ideal template to improve the surface area, create microporous structure and carbonyl groups for final carbon product. High percentage of pyridinic N, pyrrolic N and oxygen-containing groups are main contributions to the pseudo capacitance of NC-HAP-700. More important, the supercapacitors exhibit practical application in which solar energy can be stored and release to light up red LED.
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CARBON
·
2018
·
IF 7.082
Xiujun Qi,Kangsheng Huang,Xuan Wu,Wei Zhao,Hong Wang,Quanchao Zhuang,Zhicheng Ju
Potassium-ion batteries (PIBs) are an emerging energy storage technology for low cost and large scale applications. However, due to the larger K ions it suffers insufficient cycle life and poor rate capability. In this paper, these problems are surmounted by using N-doped porous carbon (NPC) anodes. Excellent electrochemical performance was demonstrated with a high reversible capacity of 296.8 mA h g −1 after 100 cycles at a current density of 50 mA g −1 . The superior performance is mainly ascribed to well-defined pore structure and high nitrogen content. The unique porous structure can effectively alleviate the volume expansion induced by the insertion of large K ions. Moreover, nitrogen doping can generate different types of defects and vacancies, thereby providing more electroactive sites. Given the abundance and universal distribution of potassium in the Earth's crust, the encouraging results make NPC a promising candidate for KIBs anodes.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 8
·4088-4101
·
IF 11.9
Tian Yu,Suiting Ning,Tingting Zhang,Xiangbin Chen,Qian Liu,Ning Qi,Zhiquan Chen,Xianli Su,Xinfeng Tang
As one kind of superionic conductor, CuAgSe is a promising thermoelectric material due to its extremely low thermal conductivity and high electron mobility. In this study, the electrical and thermal properties of CuAgSe were collaboratively optimized by changing the chemical composition. Seebeck coefficient measurements reveal that stoichiometric and CuAg-deficient CuAgSe materials show n–p transition with the increase of temperature. In contrast, the Se-deficient CuAgSe still shows n-type conduction in the α-phase at high temperatures. Positron annihilation measurements indicate that there are large amounts of cation vacancies such as Ag and Cu vacancies in the stoichiometric and CuAg-deficient samples, which provide a high concentration of hole carriers and are responsible for the n–p transition at high temperatures. The number of vacancies decreases gradually with increasing CuAg content, and in the Se-deficient CuAgSe, VAg–Se divacancies are formed, which further results in a sufficient decrease of hole carriers. As a result, the Se-deficient samples still show n-type conduction in the α phase. Our results indicate that vacancy defects are the key factors that determine the conduction type in CuAgSe, which can be tuned by the chemical composition. In addition, superb thermoelectric performance was achieved in both p-type and n-type CuAgSe, with maximum ZT of 0.96 at 573 K in (CuAg)0.96Se (p-type) and 0.55 at 630 K in (CuAg)1.02Se and (CuAg)1.04Se (n-type).
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yingkang Chen,Hang Zhang,Hongmei Li,Junhua Hu,Yan Long,Min Liu
The N-alkylation of amines with tetrahydrofuran (THF) to synthesize pyrrolidine compounds is an economic and environmental benign route. However, current catalytic system often suffered from harsh reaction condition and hazardous reagents. In this work, we developed an alumina nanosheet catalyst with a large amount of medium acid sites for synthesis of N-arylpyrrolidines. Nearly 100% target product yield could be obtained at 190 °C, and this catalyst could be reused at least 5 times without obvious deactivation. NH 3 -temperature programmed desorption (TPD) and pyridine-infrared (py-IR) revealed that the catalytic performance is positively correlated with the content of medium acid sites. In-situ IR spectrum proved that the reaction follows the carbocation mechanism. This work affords a competitive system for green sustainable chemistry.
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ChemSusChem
·
2023
·Vol. 16
·期 8
·e202202128
·
IF 8.4
Shuang Wang,Zhengrong Li,Tao Shen,Deli Wang
Graphical Electrocatalytic HERo in the making : Synthesis of Ru 7 Ni 3 nanoalloys encapsulated within N-doped carbon shells (Ru 7 Ni 3 @NC/C) is achieved for the alkaline HER. It exhibits a current density of 10 mA cm −2 at 16 mV with a Tafel slope of 29.9 mV dec −1 , and robust durability over 10 000 cycles in 1 m KOH. The high HER activity of Ru 7 Ni 3 @NC/C can be attributed to the strong synergistic interaction, N-doped carbon shells structure with high surface area and electrical conductivity. The alkaline hydrogen evolution reaction (HER) is of great significance for the large-scale green H 2 production. Currently, pressing challenges in the fabrication of cost-effective HER electrocatalysts are related to their sluggish water dissociation kinetics. Herein, a facile strategy to accelerate the desorption of HER intermediates and water dissociation is proposed. RuNi nanoalloy confined within N-doped carbon shells (Ru 7 Ni 3 @NC/C) with optimized Ru/Ni ratio and the dicyandiamide dosage was prepared. It displays an overpotential ( η 10 ) of 16 mV, Tafel slope of 29.9 mV dec −1 , and long-term stability over 10 000 cycles. The decent HER performance on Ru 7 Ni 3 @NC/C stems from the core-shell structure that is favoring the exposure of dispersed active sites, and the synergistic effect to promote water capture and dissociation. This work provides insight into the relationship between the HER performance and the electrochemical behavior of the intermediate adsorbed state, and paves an avenue toward rational design efficient electrocatalysts for HER.
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BIOORGANIC CHEMISTRY
·
2021
·
IF 5.275
Jianan Guo,Yujia Zhang,Changjun Zhang,Chuansheng Yao,Jingqi Zhang,Xiaoying Jiang,Zhichao Zhong,Jiamin Ge,Tao Zhou,Renren Bai,Yuanyuan Xie
AD is a progressive brain disorder. Because of the lack of remarkable single-target drugs against neurodegenerative disorders, the multitarget-directed ligand strategy has received attention as a promising therapeutic approach. Herein, we rationally designed twenty-nine hybrids of N -propargylamine-hydroxypyridinone. The designed hybrids possessed excellent iron-chelating activity (pFe 3+ = 17.09–22.02) and potent monoamine oxidase B inhibitory effects. Various biological evaluations of the optimal compound 6b were performed step by step, including inhibition screening of monoamine oxidase ( h MAO-B IC 50 = 0.083 ± 0.001 µM, h MAO-A IC 50 = 6.11 ± 0.08 µM; SI = 73.5), prediction of blood–brain barrier permeability and mouse behavioral research. All of these favorable results proved that the N -propargylamine-hydroxypyridinone scaffold is a promising structure for the discovery of multitargeted ligands for AD therapy.
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ChemPlusChem
·
2024
·
IF 3
Yong Wang,Xueying Lin,Xianyu Ying,Shan Hu,Hongjun Zhu
A facile C–H amination of quinazoline employing N-fluorobenzenesulfonimide (NFSI) as the amination source has been disclosed in the absence of any metal, oxidant or additive. The methodology shows a board range of quinazolines with different functional groups in moderate to good yields up to 87%. Furthermore, gram-scale reaction, desulfonylation to amine and synthesis of pharmaceutical intermediate were also investigated, which demonstrates potential applications in medicinal chemistry. A plausible amination mechanism is proposed via F+ transfer accompanied by the removal of one molecule of PhSO2F. DFT studies with experimental work suggest that the mechanism via F+ transfer is more favorable than the free radical one.
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PubMed
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Lulu Zheng,Siyu Gao,Shuaikang Yao,Yingjie Huang,Shangru Zhai,Jingai Hao,Xuemei Fu,Qingda An,Zuoyi Xiao
The development of novel materials for electrodes with high energy densities is essential to the advancement of energy storage technologies. In this study, N -doped layered porous carbon with ZIF-67-derived binary CoFe 2 O 4 -Fe particles was successfully fabricated by the pyrolysis of an Fe-based chitosan (CS) hydrogel mixed with ZIF-67 particles. Various characterization techniques were employed to assess the performance of the prepared porous CoFe 2 O 4 -Fe@NC composite. This composite exhibits excellent performance owing to the effective combination of multivalent CoFe 2 O 4 -Fe particles derived from ZIF-67 with N -doped porous carbon substances with a high surface area, which helps to accelerate ion and charge transfer. The specific capacitance of the CoFe 2 O 4 -Fe@NC composite carbonized at 700 °C reached 3960.9F/g at 1 A/g. When this composite is combined with activated carbon (AC) to construct an asymmetric supercapacitor (ASC), a density of energy of up to 84.9 W h kg −1 is attained at a power capacity of 291.6 W kg −1 . Moreover, this composite maintained a capacitance retention of up to 94.9 % after 10,000 cycles. This work offers new perspectives on high-performance supercapacitors and their applications.
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BIOMACROMOLECULES
·
2024
·
IF 5.5
Xiao Sun,Aoting Li,Ning Li,Guonan Ji,Ziyuan Song
Heteropolypeptides bearing two or more functional side chains are promising polymeric materials for various biomedical applications. However, conventional preparation of heteropolypeptides relies on the synthesis and purification of each N-carboxyanhydride (NCA) monomer in a separate manner, which substantially increases the time and cost. Herein, we report the facile preparation of heteropolypeptides with up to 86% yield within several hours, which are obtained from a mixture of crude NCA monomers. The combination of n-hexane precipitation and biphasic segregation effectively removed >90% impurities from crude NCA mixtures, allowing for the successful polymerization process. Various heteropolypeptides with monomodal distribution and narrow dispersity were efficiently prepared, whose compositions were predetermined by the feeding ratios of amino acids. We believe that this work significantly simplifies the preparation of various heteropolypeptides, boosting the downstream studies of these promising materials.
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Functional Materials Letters
·
2024
·
IF 1.2
Fengyang Zhao,Runmeng Yu,Yongjian Jiang
Herein, a nitrogen, carbon co-doped anatase and rutile double-phase waxberry-shaped TiO 2 composite photocatalyst is prepared with the one-step simple hydrothermal synthesis process, in which P25 was used as the precursor, and urea as the source of nitrogen and carbon. A suitable valence band position (2.52 eV) is provided by N–C–TiO 2 , with more active species (e.g. h + , e − , • OH and • O 2 ) being formed on the active catalysis surface, which is helpful to the redox reaction. Further comparison of experimental results ( E g = 3.01 eV) proved that the novel N–TiO 2 has preferable photocatalytic activity. In this study, an ingenious nitrogen- carbon co-doping structure was designed for the improvement of TiO 2 photocatalytic performance, which is much for reference of this method to other photocatalyst designs.
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