Journal of Materials Chemistry C
·
2024
·
IF 5.7
Guanfeng Liu,Yaoyu Liu,Zongshuai Ji,Tianyu Wang,Shuai Zhang,Bing Teng,Shaohua Ji
Organic–inorganic hybrid perovskite materials possess broad application prospects in photodetectors, light-emitting diodes (LEDs), and anti-counterfeiting due to their excellent optoelectronic properties; however, their development is still restricted by stability. In this paper, a new type of (NH4)2MnBr4(H2O)2 perovskite single crystal was synthesized using a simple solvent evaporation method. The thermally induced loss of water molecules in the crystal results in a reversible phase transition, accompanied by a change in photoluminescence (PL) from non-emission to red emission (660 nm), and the red emission originates from the d–d transition of Mn2+ (4T1–6A1). Additionally, the structure and luminescence behavior of the sample remain stable after 30 dark–red–dark cycles. (NH4)2MnBr4(H2O)2 demonstrates excellent environmental stability, as evidenced by the unchanged structure after 180 days and resistance to interference from various solvents. Notably, by exploiting the characteristics of the material and combining it with Cs3Cu2Br5, we demonstrated a multi-dimensional information encryption anti-counterfeiting label based on temperature and time gradients. This material offers a new option for thermochromic materials in anti-counterfeiting applications.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
Nano Research
·
2023
·Vol. 17
·期 4
·2646-2654
·
IF 9.9
Gong Jia’ni,Bai Pengfei,Sun Jingjing,Liu Yanyan,Dong Xueying,Hu Tao,Meng Changgong,Zhang Yifu
Aqueous rechargeable batteries are the promising energy storge technology due to their safety, low cost, and environmental friendliness. Ammonium ion (NH 4 + ) is an ideal charge carrier for such batteries because of its small hydration radius and low molar mass. In this study, VO 2 · x H 2 O with rich oxygen defects (d-HVO) is designed and synthesized, and it exhibits unique nanoarray structure and good electrochemical performances for NH 4 + storge. Experimental and calculation results indicate that oxygen defects in d-HVO can enhance the conductivity and diffusion rate of NH 4 + , leading to improved electrochemical performances. The most significant improvement is observed in d-HVO with 2 mmol thiourea (d-HVO-2) (220 mAh·g −1 at 0.1 A·g −1 ), which has a moderate defect content. A full cell is assembled using d-HVO-2 as the anode and polyaniline (PANI) as the cathode, which shows excellent cycling stability with a capacity retention rate of 80% after 1000 cycles and outstanding power density up to 4540 W·kg −1 . Moreover, the flexible d-HVO-2∥PANI battery, based on quasi-solid electrolyte, shows excellent flexibility under different bending conditions. This study provides a new approach for designing and developing high-performance NH 4 + storage electrode materials.
研究领域:
材料科学
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电化学
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纳米技术
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储能
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DOI
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2025
·Vol. 47
·期 8
·1-20
·
IF 3.8
Hu Zhengchun,Huang Xinrui,Shen Wu,Guo Minghao,Liao Bing
Leakage and migration of landfill leachate are often accompanied by complex biogeochemical processes that form a continuous series of redox zones in the leachate plume. Nitrogen in leachate, especially NH 4 ⁺-N, is one of the most important pollutants contributing to groundwater contamination. While traditional landfill pollution prevention and control measures often have difficulty effectively addressing the complex migration and transformation behaviors of NH 4 ⁺-N in leachate, an in-depth study of the migration and transformation processes of NH 4 ⁺-N in the redox compartment is crucial for the development of accurate and efficient pollution prevention and control strategies. In this study, static transformation experiments, dynamic simulated column experiments and high-throughput sequencing techniques were used to systematically investigate the migration and transformation processes of NH₄⁺-N in the redox bands of a simulated landfill. The results showed that in the NH 4 ⁺-N transformation experiment, the soil in the simulated oxidation zone had the strongest ability to transform NH 4 ⁺-N, with the NH 4 ⁺-N concentration decreasing from 40 to 0.03 mg/L, whereas the sterilization treatment completely suppressed the transformation process of NH 4 ⁺-N in the OZ. The NH 4 ⁺-N in the continuous redox zone completely penetrated the simulated soil column on the 7th day, and the maximum effluent concentration was stable in the range of 1530 ± 30 mg/L. The trends of NH 4 ⁺-N in each independent redox zone were consistent, with the TZ having the richest microbial community abundance and number of species, and some Acidobacteria were able to reduce Fe(III) under anoxic conditions and interact with the organic matter, which effectively contributed to the cycling of Fe within the TZ. These findings indicate that there are significant differences in the biogeochemical cycling process of NH 4 ⁺-N in different redox zone environments, and this study provides a new research perspective for a deeper understanding of the biogeochemical cycling mechanism of the elements in landfills and an important scientific basis for the prevention, control, and remediation of landfill pollution.
研究领域:
环境科学
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微生物学
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水文学
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土壤化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Junyan Li,Wei Zhang,Xin Ge,Ming Lu,Xiangxin Xue,Zizhun Wang,Nailin Yue,Junkai Zhang,Xingyou Lang,Qing Jiang,Weitao Zheng
Inspired by a well-known architecture notion that load-bearing walls enable maintaining a highly-stable multiple-floored building, superior advantages are afforded via fabricating the NH 4 + ions pre-intercalated Mo 2 CT x MXene (Mo 2 CT x -N) in a mixed solution of NH 4 F and HCl via a simple one-step hydrothermal method. As a result of the synergistic effects of pillared structure, immobilizing -F groups and unlocking Mo-based redox, the Mo 2 CT x -N remarkably delivered a reversible capacity of 384.6 mAh g −1 at 200 mA g −1 after 100 cycles. Our work lays a foundation for fully packaging its optimal performance via carding and architecting the chemistry of the MXene layers and between them.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Yuexia Wang,Jiaqi Xu,Xuan Lin,Chaosi Liu,Xinqing Lu,Yijing Gao,Francesco Pepe,Domenico Caputo,Weidong Zhu
Ti-MWW zeotypes, characterized by their unique dual pore architecture consisting of intralayer 10-membered ring (MR) pore channels and additional interlayer 10-MR pore channels that are interconnected to intracrystalline 12-MR supercages, exhibit a remarkably catalytic superiority in the selective oxidation of small and/or linear alkenes with hydrogen peroxide (H 2 O 2 ), surpassing other titanosilicate zeotypes in performance. However, a further improvement on their catalytic performance is still needed for the industrialization of alkene epoxidation over Ti-MWW. In the present work, the introduction of NH 4 + species into Ti-MWW was conducted via a facile but effective treatment of the as-synthesized zeotypes with NH 4 Cl, named N-Ti-MWW. The comprehensive characterization of N-Ti-MWW, derived from NH 4 + -exchanged Ti-MWW, coupled with Density Functional Theory (DFT) calculations, conclusively demonstrates that the integration of NH 4 + into Ti-MWW promotes the generation of -Ti-OOH hydroperoxo intermediates, resulting in a higher catalytic activity in alkene epoxidation in comparison to the parent one. Moreover, the solvolysis of epoxides is significantly suppressed on N-Ti-MWW, enabling the catalyst to display a superior selectivity towards the targeted epoxide, thereby improving its overall catalytic performance. Additionally, N-Ti-MWW is reusable, after the regeneration of the deactivated catalyst simply treated with NH 4 Cl. As a result, it is anticipated that N-Ti-MWW would be applicable in the industrial epoxidation of alkenes with H 2 O 2 .
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Congcong Piao,Yitong Lin,Zhiyu Liu,Liang Chen,Jianhe Tang,Dawei Fang,Jun Wang
ABSTRACT Several novel Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalysts are prepared via chemical reduction and calcination methods to degrade organic dyes containing N and S and convert NO 2 - , NO 3 - and SO 3 2- into (NH 4 ) 2 SO 4 . Sodium borohydride (NaBH 4 ), ascorbic acid (C 6 H 8 O 6 ) and hydrazine hydrate (N 2 H 4 ·H 2 O) are selected as reductants to deposit CuPd alloy nanoparticles on corresponding photocatalyst. The influence of solar light irradiation time on photocatalytic degradation of organic dye and conversion of the generated inorganic ions is studied. The reusability and stability of the prepared photocatalysts are assessed. The results indicate that the Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalyst prepared by using NaBH 4 has best photocatalytic activity, reusability and stability. The capture experiment of active species proves that holes play crucial roles in photocatalytic degradation of organic dyes and conversion of SO 3 2- and electrons are momentous for the conversions of NO 2 - and NO 3 - . A possible mechanism on photocatalytic degradation of organic dyes containing N and S and conversions of NO 2 - , NO 3 - and SO 3 2- into (NH 4 ) 2 SO 4 caused by Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalyst is proposed.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 32
·19130-19139
·
IF 10.733
Xiao Wang,Baojuan Xi,Zhenyu Feng,Weihua Chen,Haibo Li,Yuxi Jia,Jinkui Feng,Yitai Qian,Shenglin Xiong
Rechargeable aqueous zinc-ion batteries have shown great potential for grid-scale applications owing to their high safety, low cost and sustainability. However, they are still limited by the lack of suitable cathode materials with high energy density and satisfactory cycling stability. Herein, a highly reversible zinc-ion battery system with (NH4)2V6O16·1.5H2O nanobelts as the cathode materials and aqueous ZnSO4 solution as the electrolyte has been developed. The (NH4)2V6O16·1.5H2O nanobelts deliver a superior reversible specific capacity of 479 mA h g−1 at 0.1 A g−1 with a desirable energy density of 371.5 W h kg−1 and exhibit an impressive cycling stability, i.e. 152 mA h g−1 retained after 3000 cycles at 5 A g−1. The high energy density and long-term cycling stability make (NH4)2V6O16·1.5H2O a promising candidate for grid-scale energy storage. This work could be extended to choose and construct other ideal high-performance cathode materials for ZIBs and other multivalent metal ion storage systems.
研究领域:
材料科学
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能源存储与转换
✓ 已验证
DOI
高影响因子
Environmental Technology & Innovation
·
2021
·
IF 5.263
Yansong Zhang,Zehai Yu,Yunshuang Hu,Caifeng Song,Fuwei Li,Wen He,Xiaofeng Wang,Zhixia Li,Hongfei Lin
Magnetic polyvinyl alcohol–sodium alginate–diatomite (PVA–SA-diatomite) composite carriers for immobilized microorganisms were prepared for removal of NH 4 + -N from effluents. The mass transfer efficiency, chemical stability, and NH 4 + -N removal efficiency of the carriers were investigated. The amount of each ingredient added significantly affected the performance of the carriers. The optimal concentrations of PVA, SA, diatomite , and Fe 3 O 4 were 10%, 1%, 1%, and 2%, respectively. The obtained carrier achieved a NH 4 + -N removal efficiency of 72.5% after reaction for 12 h, which was 31.8% higher than that with the non-magnetic carrier. The removal of NH 4 + -N was attributed to the cooperative action among non-magnetic ingredients, magnetic ingredients, and microorganisms. The adsorptions of NH 4 + -N by non-magnetic ingredients and Fe 3 O 4 contributed 21.2% and 25.5%, respectively, and microorganism metabolism contributed 53.2% to NH 4 + -N removal. The novel texture structure of the carrier leads to improved mass transfer of nutrients and stable activity of microorganisms. Nitrification followed the first-order reaction for low concentration of effluents and zero-order reaction for high concentration of effluents. The reaction rate increased with increasing initial NH 4 + -N concentration. The magnetic carrier was applicable for a long time. These results show the great potential of the developed carrier for industrial applications.
研究领域:
环境工程
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水处理
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Changyuan Xu,Fengjiao Zhao,Yan Ding,Haizhen Song,Qun Wang,Hongming Yin
In this study, we propose a novel strategy to reduce Eu 2 O 3 to Eu 2+ in the 34.88P 2 O 5 -13.57B 2 O 3 -34.88ZnO-16.67KBr (PBZB) glass system by introducing (NH 4 ) 2 HPO 4 as a reducing phosphorus source. Photoluminescence (PL), photoluminescence excitation (PLE) spectral and UV–Vis absorption spectral analyses revealed that the emission peak at 325 nm excitation originates from the 4f 6 5d 1 → 4f 7 transition of Eu 2+ , confirming the reduction efficacy of (NH 4 ) 2 HPO 4 . Furthermore, incorporating 7.14 % Mn 2+ into PBZB glass and adjusting the concentration of Eu 2 O 3 demonstrated that Eu 2+ doping significantly enhances the red emission of Mn 2+ at 630 nm. Specifically, when the Eu 2 O 3 concentration is 0.12 mol%, the Mn 2+ emission intensity reaches its peak, with a 32.6 % increase in photoluminescence quantum yield (PLQY). However, further increasing the Eu 2 O 3 concentration leads to a decrease in Mn 2+ emission intensity and the appearance of Eu 3+ emission peaks, indicating a limited reduction capacity. Emission spectrum analysis showed a Eu 3+ reduction rate of 76.09 %. The effective energy transfer mechanism from Eu 2+ to Mn 2+ was verified through spectral overlap and decay curve analysis, with calculated energy transfer efficiency being similar to the PLQY increment. This study simplifies the Eu 3+ reduction process and provides a new method for optimizing Mn 2+ red emission in glass.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Xuesong Ye,Zhencheng Ge,Qiliang Xiao,Bohan Liu,Meng Chen,Fangmin Wu,Jun Nan
In remote areas, low-pressure ultrafiltration membrane (LPM) systems can be applied in decentralized water supplies for the treatment of groundwater containing Fe 2+ , Mn 2+ , and NH 4 + . However, improving the performance of the LPM systems, such as the stable flux and removal capacity, presents a challenge. In this study, a novel opposite-flow low-pressure ultrafiltration membrane (O-LPM) system was applied, and its performance was evaluated. Experimental results showed that after 46 days of operation, the steady flux of the O-LPM systems were 1.87-fold and 1.74-fold higher than that of the conventional D-LPM systems under Mn 2+ concentration of 0.3 mg L −1 and 1.5 mg L −1 , respectively. With a mixed pollutant system containing Fe 2+ (0.5 mg L −1 ), Mn 2+ (0.3 mg L −1 ), and NH 4 + (1.0 mg L −1 ), the O-LPM-ripening period for Mn 2+ removal was shortened from 16 days to 8 days, and the NH 4 + removal efficiency was increased from 61.46% to 80.97%. The bio-cake layer in the O-LPM systems was thinner and had a higher uniformity than in the D-LPM systems, resulting in a larger stable flux range. The relative abundance of functional bacteria (MnOB, IOB, and NOB) was generally higher in O-LPM systems than in the D-LPM systems. Overall, these results are of high relevance for groundwater treatment in remote areas, providing guidance for the widespread application of the O-LPM system in decentralized water supplies.
研究领域:
环境工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Yue-Ling Sun,Gang-Xiang Liu,Yi-Lei Lv,Liang Ma,Wen-Dong Yao,Ru-Ling Tang
Phosphate crystals are valuable materials according to their diverse structures and physical and chemistry properties. A zinc orthophosphate, (NH 4 ) 3 (H 3 O)Zn 4 (PO 4 ) 4 , has been obtained via hydrothermal route. It was crystallized in hexagonal space group P 6 3 , featuring a three-dimensional (3D) [Zn(PO 4 )] – anion network built by corner-sharing connected ZnO 4 and PO 4 tetrahedra. The NH 4 + and H 3 O + units are located in the six-member cavities of the framework as the balanced cations. (NH 4 ) 3 (H 3 O)Zn 4 (PO 4 ) 4 exhibits a moderate and phase matchable second harmonic generation effect (SHG) about 1.4 times of KH 2 PO 4 (KDP), which is the strongest in zinc orthophosphates. Besides structural features, optical properties measurements and theoretical analyses of (NH 4 ) 3 (H 3 O)Zn 4 (PO 4 ) 4 were performed.
研究领域:
材料科学
·
光学
·
晶体学
·
化学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Yanchen Jiang,Chao Wang,Jiangfeng Huang,Yin Huang,Ao Sun,Xia Li,Jiayi Lu,Zuoliang Wen,Liang Xue,Junwu Zhu
Graphical We propose a one–step hydrothermal synthesis method to regulate the lattice NH 4 + ion content in vanadium oxide materials and discover varied lattice NH 4 + content could affect the structural evolution and electrochemical performance of the material, and our work will provide a new route for designing high performance vanadium oxide cathode materials in aqueous zinc ion batteries. Aqueous zinc ion batteries have been extensively researched due to their distinctive advantages such as low cost and high safety. Vanadium oxides are important cathode materials, however, poor cycle life caused by vanadium dissolution limits their application. Recent studies show that the lattice NH 4 + in vanadium oxides can act as a pillar to enhance structural stability and play a crucial role in improving its cycling stability. Nevertheless, there is still a lack of research on the effect of the lattice NH 4 + content on structural evolution and electrochemical performance. Herein, we synthesize vanadium oxides with different contents of lattice NH 4 + by a one-step hydrothermal reaction. The vanadium oxides with lattice NH 4 + exhibit high initial capacity, as well as good cycling stability and rate performance compared to bare vanadium oxide. Combined with electrochemical analyses, ex-situ structural characterizations, and in-situ X-ray diffraction tests, we reveal that the lattice NH 4 + content plays a positive role in vanadium oxides′ structural stability and cation diffusion kinetics. This work presents a direction for designing high–performance vanadium cathodes for aqueous zinc ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）