DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 13
·4555-4566
·
IF 4.39
Ishaq Muhammad,Maher Jabeen,Peiran Wang,Yu-Shi He,Xiao-Zhen Liao,Zi-Feng Ma
The advancement of novel synthetic approaches for micro/nanostructural manipulation of transition metal phosphide (TMP) materials with precisely controlled engineering is crucial to realize their practical use in batteries. Here, we develop a novel spray-drying strategy to construct three-dimensional (3D) N,P co-doped graphene (G-NP) microspheres embedded with core–shell CoP@C and MoP@C nanoparticles (CoP@C⊂G-NP, MoP@⊂G-NP). This intentional design shows a close correlation between the microstructural G-NP and chemistry of the core–shell CoP@C/MoP@C nanoparticle system that contributes towards their anode performance in lithium-ion batteries (LIBs). The obtained structure features a conformal porous G-NP framework prepared via the co-doping of heteroatoms (N,P) that features a 3D conductive highway that allows rapid ion and electron passage and maintains the overall structural integrity of the material. The interior carbon shell can efficiently restrain volume evolution and prevent CoP/MoP nanoparticle aggregation, providing excellent mechanical stability. As a result, the CoP@C⊂G-NP and MoP@⊂G-NP composites deliver high specific capacities of 823.6 and 602.9 mA h g−1 at a current density of 0.1 A g−1 and exhibit excellent cycling stabilities of 438 and 301 mA h g−1 after 500 and 800 cycles at 1 A g−1. The present work details a novel approach to fabricate core–shell TMPs@C⊂G-NP-based electrode materials for use in next-generation LIBs and can be expanded to other potential energy storage applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Yu Zhang,Ying Huang,Junhong Jiang,Jianbo Chen,Weixing Han,Yuxian Liu,Linjun Kong,Jian Gong,Minhua Su,Diyun Chen
Mg and N co-doped carbon quantum dots (Mg-N-CQDs) were synthesized and applied to alleviate oxygen toxicity by UV-B radiation and enhance antioxidative responses to wheat seedlings. It showed that Mg-N-CQDs pre-treatment attenuated the UV-B stress effects in a dose-dependent manner, as indicated by enhancing the characteristics of seed germination and early seedling growth parameters. Meanwhile, Mg-N-CQDs can be applied in plant nutrient solutions with nitrogen, phosphorus, potassium, and other fertilizers to promote the growth of seedlings. Furthermore, efficient antioxidant systems, chlorophyll content, and stability of fluorescence intensity were activated by Mg-N-CQDs pre-treatment, which effectively increased the activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD), and eliminate the contents of malondialdehyde (MDA) and hydrogen peroxide, and the production rate of superoxide anion radical in the roots and germs, thereby preventing oxidative damage from UV-B stress. Notably, Mg-N-CQDs pre-treatment significantly increased the expression of related genes to improve the antioxidant capacity of roots and germs, resulting in an increased level of ATPS, CS, and GS. The mechanism study indicated that amino and hydroxyl groups and Mg, N modified CQDs could broaden the light absorption range of CQDs and improve the ability to convert blue light and ultraviolet rays to visible light, which was the main reason why Mg-N-CQDs could relieve wheat seedlings from ultraviolet stress. Therefore, Mg-N-CQDs could serve as a regulator to reduce the damage of UV-B, laying the foundation for their application in environmental protection and agricultural production.
研究领域:
植物学
·
环境科学
·
农业科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Danke Chen,Jiapeng Ji,Zhongqing Jiang,Min Ling,Zhongjie Jiang,Xinsheng Peng
Transition metal-nitrogen-carbon (M/N/C) catalysts, Fe/N/C in particular, with low cost, good tolerance to methanol and promising activity has great potential to replace Pt-based catalysts in oxygen reduction reaction (ORR). However, for metal atoms are easy to migrate and agglomerate during pyrolysis , it still remains a challenge to rationally design precursors to synthesize highly active M/N/C without significant agglomeration of metal sites. In this work, we propose a molecular-confinement strategy to synthesize sub-nano Fe/N/C catalysts by confinement [Fe(CN) 6 ] 3- in zeolitic imidazolate framework-8 (ZIF-8) crystals to minimize the agglomeration of Fe atoms during pyrolysis . The half-wave potential of the prepared sub-nano Fe/N/C is 40 mV superior to that of commercial 20% Pt/C in alkaline medium . Besides, it has electron transfer number close to 4.00, with below 0.5% H 2 O 2 yield, excellent long-term stability with only −5 mV shifts after 10000 cycles, and superb methanol tolerance. When utilized in Zn-air batteries as the cathode, it exhibits better activity, stability, and higher specific capacity than that of Pt–RuO 2 /C, showing a good potential for air cathode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2019
·Vol. 11
·期 3
·418-424
·
IF 1.158
Lv Yao,Huang Shifei,Zhao Yufeng
The N-B-F tridoping 3D hierarchical porous graphitized carbon network is produced by a one-step synthesis using chitosan as a precursor. The N-B-F tridoping 3D hierarchical porous graphitized carbon network is rich of nitrogen, boron and fluorine hetero atoms and exhibited relatively
high specific capacitance value of 316 F g–1 in 6 M KOH at a current density of 20.0 A g–1. As well as good cycling stability with capacitance retention of 100% over 10000 cycles, and good rate performance (90.3% capacity retention from 0.5 A g–1
to 20.0 A g–1). When used as supercapacitor electrode, the all carbon symmetric supercapacitor based on N-B-F tridoping 3D hierarchical porous graphitized carbon network delivers a high energy density of 23.87 Wh kg–1, outperforming the state-of-the-art carbon
material.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 34
·4718-4731
·
IF 4.76
Xian Yang,Junyi Ruan,Chen Ma,Bingjie Hao,Xiaoyu Huang,Guolin Lu,Chun Feng
Self-seeding of living crystallization-driven self-assembly (CDSA) has been considered to be one of the most attractive strategies to fabricate well-defined fiber-like nanostructures with excellent control over their length and composition. To extend the scope of self-seeding of oligo(p-phenylene vinylene) (OPV)-based copolymers, the poly(N-(2-hydroxypropyl) methacrylamide) (PHPMA) segment with proven biocompatibility, synthetic flexibility and well-developed conjugation chemistry, which was synthesized by reversible addition–fragmentation chain transfer (RAFT) polymerization using an azide-containing chain transfer agent, was coupled with the alkyne-terminated OPV block by a copper-catalyzed alkyne–azide cycloaddition reaction. All OPV5-b-PHPMA (OPV5-b-PHPMA36, OPV5-b-PHPMA71 and OPV5-b-PHPMA100, the subscripts represent the number of repeat units of each block) with the same crystallizable core-forming OPV segment but different corona-forming PHPMA blocks of various chain lengths can self-assemble in ethanol to form fiber-like micelles with a length of several micrometers by a direct heating and cooling process. Uniform fiber-like micelles with a length up to ∼1 μm can be easily prepared by temperature-induced self-seeding of OPV5-b-PHPMA71. However, for self-seeding of OPV5-b-PHPMA36, ribbon-like nanostructures with a uniform and controllable length were formed, whereas relatively short fiber-like micelles with broad length distributions were formed under similar conditions for OPV5-b-PHPMA100. These results indicated that the length of the PHPMA segment played an important role in determining the self-seeding behavior of OPV5-b-PHPMA.
研究领域:
高分子化学
·
纳米材料科学
·
自组装
·
生物相容性材料
·
药物递送系统
✓ 已验证
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 12
·1550
·
IF 4.146
Hongzhou Dong,Yingjie Chen,Chong Gong,Lina Sui,Qiong Sun,Kangle Lv,Lifeng Dong
Due to slow kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) during discharging and charging processes, it is essential to rationally design and synthesize non-precious metal bifunctional electrocatalysts with good performance for metal-air batteries. Herein, Ag-MnFe2O4heterojunction nanoparticles supported on N, S, P-codoped graphene (NSPG) are developed with enhanced ORR and OER bifunctional electrocatalytic activities and stability. In contrast, S, P-doped graphene (SPG) and N, P-doped graphene (NPG) show less stabilization for the heterojunction particles. For example, under alkaline conditions, the ORR half-wave potential of Ag-MnFe2O4/NSPG can reach 0.831 V, and the over potential for OER is 0.56 V at the current density 10 mA·cm−2. Furthermore, Ag-MnFe2O4/NSPG shows better methanol resistance and durability than Pt/C catalysts.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Weicheng Li,Jiangyi Wu,Xiaojia Huang
Extraction strategy is designed for the pretreatment of low contents of aromatic N- and S-containing compounds (ANSCs) in environmental waters prior to chromatographic analysis . To enrich studied ANSCs effectively, poly (9-vinylanthracene/4-vinylphenylboronic acid- co -ethylene dimethacrylate/divinylbenzene) polymeric monolithic sorbent were facilely fabricated using the one-step free radical polymerization . Various technologies were employed to investigate the structure and morphology of the resultant monolith. Combining with solid-phase microextraction format, the sorbent exhibited satisfying concentrated performance for ANSCs through multiply interactions under the optimized conditions. After desorption with eluent , the retained analytes were analyzed by HPLC. Results showed that the extraction efficiencies ranged from 51.6 to 93.2%. The linear ranges and limits of detection were 0.01–150 μg/L and 0.63–2.64 ng/L, respectively. Furthermore, the precisions were all below 10%. The introduced approach was productively practiced on three real water samples for simultaneous quantification of studied ANSCs, and the fortified recoveries ranged from 81.5 to 118%. All the results well evidenced that prepared sorbent can enrich ANSCs effectively and the introduced method is reliable alternative for routine analysis of ANSCs in environmental waters.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Jingren Yang,Deqian Zeng,Qinggang Zhang,Ruofan Cui,Muhammad Hassan,Lingqian Dong,Jun Li,Yiliang He
Fenton-like technology is a green pathway for removing recalcitrant organic pollutants from the environment. However, low catalytic efficiency and poor stability hinder the development of Fenton-like technology as a result of the lack of effective catalysts. Here, we report a highly efficient and stable Fenton-like catalyst based on isolated single Mn atom anchored on N-doped porous carbon. The catalyst exhibits high activity and stability in the heterogeneous activation of peroxymonosulfate (PMS) for organic pollutant degradation, showing an outstanding turnover frequency of greater than 5.69 min −1 in bisphenol A (BPA) degradation. A variety of analytical techniques as well as density functional theory (DFT) calculations suggest that the unique N-coordinated single Mn atom (MnN 4 ) serves as a highly catalytically active site for PMS activation, while the adjacent pyrrolic N site acts as an adsorption site for the target organic molecules. The ultra-high catalytic activity of single Mn atom catalyst can be attributed to its fantastic dual reaction sites, which remarkably shorten the migration distance from the radical to the adsorbed organic molecules.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 19
·6754
·
IF 4.927
Kai Cai,Yechun Lin,Yunfei Ma,Zhixiao Yang,Lei Yu,Jie Zhang,Dongqing Xu,Rong Zeng,Weichang Gao
Diisocyanates are highly reactive compounds with two functional isocyanate groups. The exposure of diisocyanates is associated with severely adverse health effects, such as asthma, inflammation in the respiratory tract, and cancer. The hydrolysis product from diisocyanates to related diamines is also a potential carcinogen. Here, we developed an effective, accurate, and precise method for simultaneous determination of residual diisocyanates and related diamines in biodegradable mulch films, based onN-ethoxycarbonylation derivatization and gas chromatography-mass spectrometry. The method development included the optimization of ultrasonic hydrolysis and extraction, screening ofN-ethoxycarbonylation conditions with ethyl chloroformate, evaluation of the diamines degradation, and analysis of the fragmentation mechanisms. Under the optimum experimental conditions, good linearity was observed withR2> 0.999. The extraction recoveries were found in the range of 93.9–101.2% with repeatabilities and reproducibilities in 0.89–8.12% and 2.12–10.56%, respectively. The limits of detection ranged from 0.0025 to 0.057 µg/mL. The developed method was applied to commercial polybutylene adipate co-terephthalate (PBAT) biodegradable mulch film samples for analysis of the diverse residual diisocyanates and related diamine additives. The components varied greatly among the sample from different origin. Overall, this study provides a reliable method for assessing safety in biodegradable mulch films.Keywords:diisocyanates and related diamines;ultrasonic hydrolysis and extraction;N-ethoxycarbonylation;GC-MS;biodegradable mulch film
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2025
·Vol. 19
·期 12
·1-17
·
IF 6.4
Wei Biao,Liu Daoqing,Peng Ran,Zhou Yi,Li Qianwei,Zhao Huazhang
The remediation of nitroaromatic-contaminated water systems remains a critical environmental challenge, creating the urgent need for cost-effective, non-precious metal catalysts to increase wastewater biodegradability. In this study, we present an Fe/N-functionalized three-dimensional porous carbon (Fe–N–C) catalyst synthesized via a straightforward pyrolysis approach that enables efficient nitrobenzene (NB) degradation via electrochemical and chemical reduction pathways. The high-temperature pyrolysis process facilitates the iron-catalyzed reconstruction of the carbon matrix, resulting in a hierarchically porous structure with increased graphitization and uniformly distributed macrocyclic Fe–N 4 coordination sites. These structural features give the Fe–N–C catalyst exceptional electron transfer kinetics, catalytic activity, and pH adaptability, surpassing conventional graphite (GR) and nitrogen-doped carbons (NPCs) in NB reduction. Systematic evaluation of the electrochemical reduction performance revealed that the Fe–N–C electrode achieved the highest NB removal efficiency. To further assess the versatility of the catalyst, a functionalized Fe–N–C/zero-valent iron (ZVI) composite was engineered by integrating Fe–N–C as a catalytic layer onto the reductant ZVI. Compared with ZVI alone, this composite markedly increased the NB reduction efficiency. These findings provide valuable insights into the electrochemical reduction process of Fe–N–C and new directions for the rational design of efficient nitrobenzene reduction systems.
研究领域:
环境科学
·
材料科学
·
电化学
·
催化
·
水处理
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 3
·964-977
·
IF 3.5
Zhu Q.,Wei S.,Wang C.,Yang X. B.,Zhou B.,Xie Z. X.,Duan Z. Q.,Hu Y. M.
Unique wool-ball shaped nanocrystalline CoS was synthesized using solvothermal method in which dopamine (DA) was added as carbon source to combine with the CoS. The DA in situ polymerized and coated on the CoS particle surfaces during the solvothermal process. N, S co-doped carbon-encapsulated CoS(Co 9 S 8 ) were achieved after a post carbonization. In the composites, CoS(Co 9 S 8 ) nanocrystals and carbon are tightly bound and embedded into the amorphous carbon layer to form a spherical core–shell structure. Hybrid counter electrodes (CEs) fabricated with the product have good conductivity, dispersion and stability due to the synergetic effect between carbon and nanocrystalline CoS(Co 9 S 8 ). Charge transfer through the CE/electrolyte interfaces is improved by dopamine-carbon combination. In the optimal case, PCE of 8.82% of the dye-sensitized solar cells (DSSCs) with the hybrid CEs was achieved, which is close to that of the cell with Pt (8.86%) CE, and is a 41.12% increase compared with that of CoS CE cell with the structure of photoanode/N719/electrolyte (I − /I 3 − )/CE. Moreover, stability of the cells with the composite CEs was greatly improved. The results demonstrate that the as-prepared composites are promising alternatives to Pt-CEs for high-performance DSSCs. The reported preparation method will guide further developments in highly efficient carbon-based catalysts for electrochemistry and energy related applications.
研究领域:
材料科学
·
能源技术
·
电化学
·
纳米技术
·
太阳能电池
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Zichun Xiao,Ya-Nan Zhou,Xiaowei Wang,Jiawu Cui,Mingyu Yang,Chengyong Shu,Duzhao Han,Jiangqi Zhou,Chengxin Peng,Wei Tang,Yuping Wu
Lithium metal is considered as the ultimate anode for next-generation high energy-density batteries. However, its practical application is still severely hindered by Li dendrite growth as well as infinite volume variation along plating and stripping. Herein, we report a dual-layered, spatially ordered composite skeleton for bottom-up lithium growth by uniformly incorporating Li6.06La3Zr2Al0.2O12 (LLZO) in the upper layer and ZnO in the bottom layer, respectively, in the matrix of carbon fibers (CFs). The well-dispersed ZnO nanoparticles on CFs in the bottom layer function as lithiophilic nucleation sites to homogenize Li nucleation, while LLZO nanoparticles on CFs in the upper layer facilitate Li ion diffusion and distribution for stable lithium growth owing to the high ion conductivity of LLZO. Benefiting from this synergetic effect, the CFs@LLZO//CFs@ZnO composite skeleton can effectively induce Li plating/stripping in a controllable spatially ordered manner, suppressing the volume variation and inhibiting the formation of dendritic lithium. As a result, the symmetric cell using Li|CFs@LLZO//CFs@ZnO||CFs@LLZO//CFs@ZnO|Li presents good cycling stability over 2500 h with a small overpotential of 12 mV at 1 mA cm–2. Notably, under a harsh negative-to-positive N/P ratio of 1, the Li|CFs@LLZO//CFs@ZnO||NCM811 full cell delivers a lifespan of 100 cycles with a capacity fading of only 0.175% per cycle and an average CE of 99.3%.
研究领域:
材料科学
·
电化学
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）