SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yanzhou Bao,Jiabao Yan,Jie Hu,Jing Li
Ion-selective electrodes (ISEs) have significant superiority in monitoring water samples and various functional materials have been explored as solid contacts (SCs) to improve the detection reliability. However, water layer usually destroys the interfaces among electron collector, SCs and ion-selective membranes, especially in monitoring complicated actual wastewater, resulting in instability or loss of function. Here we demonstrate that surface hydrophobization of SCs is a feasible approach to minimize adverse effect of water layer on unstable SCs adhered to electron collector, ensuring long-term reliability of ISEs in actual wastewater monitoring. Though NH 4 + -ISE with MoO x @polyaniline composite SC has low standard deviations (SDs) of the standard potential (E 0 ) measured in NH 4 + standard solutions, Nernstian slopes are dramatically reduced from 58.66 to 27.65 mV/dec after 16-day actual wastewater monitoring. Accordingly, measured NH 4 + concentrations of actual wastewater have a high degree of inaccuracy up to ca. 850%. In contrast, the ISE with a superhydrophobic SC has a slope closer to the ideal Nernstian slope, lower potential drift and E 0 SDs, and higher resistance against external interferences, due to water layer inhibition of the SC. Importantly, superhydrophobic SC-ISE shows a near-Nernstian response in steady state and accurate NH 4 + concentration determination during 30-day actual wastewater monitoring.
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高影响因子
CRYSTAL GROWTH & DESIGN
·
2018
·
IF 3.972
Fangfang He,Qian Wang,Cuifang Hu,Wen He,Xueying Luo,Ling Huang,Daojiang Gao,Jian Bi,Xin Wang,Guohong Zou
Two new antimony sulfate chlorides named (NH4)2SbCl(SO4)2 and (NH4)SbCl2(SO4) were successfully synthesized through solvent-free synthesis method. (NH4)2SbCl(SO4)2 exhibits a three-dimensional framework constructed of [SbCl(SO4)2]2– chains and NH4+ ions. And the NH4+ cations play the role of charge balance and provide the hydrogen bond constructed with oxygen atoms. (NH4)SbCl2(SO4) shows a two-dimensional layer structure that is composed of the regularly stacked [SbCl2(SO4)]− chains via hydrogen-bonding interactions. Both of the titled compounds possess the same chemical composition and the similar Sb–Cl–SO4 chains, while hydrogen-bonding interactions and lone-pair cations play the synergistic effect on the framework structures and macroscopic centricities resulting in that the (NH4)2SbCl(SO4)2 is centrosymmetric and the (NH4)SbCl2(SO4) is non-centrosymmetric (NCS). Powder second harmonic generation (SHG) measurements indicated that the NCS compound (NH4)SbCl2(SO4) is type I phase-matchable and exhibits SHG responses of ∼1.7 times that of KH2PO4.
研究领域:
材料科学
·
晶体学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 18
·14711-14721
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IF 2.779
Feng Dong,Chen Qiduo,Mei Yi,Chen Xinzhi,Zeng Tianbiao
LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) cathode material was usually prepared with Ni 2+ , Co 2+ , Al 3+ co-precipitation method using NaOH/NH 3 ·H 2 O aqueous solution with strictly control of liquid feeding rate and pH value. In this contribution, a facile method was proposed to co-precipitate Ni 2+ , Co 2+ , Al 3+ for synthesizing NCA using (NH 4 ) 2 C 2 O 4 ·2H 2 O as precipitant without control of pH and liquid feeding rate. The impact of reagents (sulfate reagents, nitrate reagents, chloride reagents, acetate reagents) on morphology, micro-structure and final electrochemical performances of NCA were systematically studied. It was suggested that sulfate reagents are suitable for synthesizing NCA. Furthermore, an optimum synthesis route was further selected for mass production. The NCA delivered reversible specific capacity of about 200 mAh g −1 , 191 mAh g −1 , 177 mAh g −1 , 153 mAh g −1 , 132 mAh g −1 , 115 mAh g −1 , 105 mAh g −1 and 94 mAh g −1 at 0.1 C, 0.5 C, 1 C, 2 C, 3 C, 4 C, 5 and 6 C, respectively. Considering the facile and economical synthesis method of precursor, this work can be a footstone for advancing the practical application of NCA cathodes.
研究领域:
材料科学
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电化学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yi Yang Xu,Lei Meng,Miao Miao Zhao,Chu Xin Peng,Fei Yen
While all of the polymorphs of pure NH 4 I and KI are non-polar, we identify that (NH 4 ) 0.95 K 0.05 I is ferroelectric and (NH 4 ) 0.87 K 0.13 I and (NH 4 ) 0.83 K 0.17 I are pyroelectric through measurements of their pyroelectric current and complex dielectric constant. The order to disorder phase transitions occur near 245 K. Magnetic susceptibility measurements indicate that the proton orbitals of the NH 4 + continue to become ordered in the ground state in the (NH 4 ) 1–x K x I system up to x ≤ 0.17. The polar phases are proposed to stem from K + ions disrupting the symmetry of proton-orbital-lattice interactions between the NH 4 + and I – ions. Our work introduces a new pathway for the ordered phases of ammonium-based compounds to potentially become ferroelectric.
研究领域:
材料科学
·
凝聚态物理
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2019
·
IF 4.978
Chenhong Tong,Jin Hou,Chunpeng Yang
The preparation of NH 4 + -loaded merlinoite (N-zeolite) for extracting potassium was studied systematically in seawater . N-zeolite was gained from K + -loaded merlinoite (K-zeolite), in which potassium ions were exchanged by ammonium ions. The amount of reagents, hydrothermal reaction temperature and reaction time were detailedly researched in order to obtain the optimized preparation conditions of N-zeolite. The experiment showed that the ion exchange between ammonium ions and potassium ions could be instantly completed at room temperature. The ion exchange equilibrium and property of N-zeolite for potassium extraction were studied in seawater at room temperature. The results indicated the ion exchange capacity for potassium reached equilibrium in about 50 min. Since then, the maximum value of ion exchange capacity was 35.5 mg/g. The ion exchange separation factors for K K + /N a + , K K + /C a 2 + , K K + /M g 2 + were 21, 91 and 247, respectively. N-zeolite had good properties of reproducibility and reutilization through six times of repeated modified experiments. K-zeolite and N-zeolite revealed a reversible type-III isotherm characteristic by N 2 adsorption–desorption experiments. The separation mechanism of N-zeolite for extracting potassium selectively was dominated by the memory function for a specific ion (K + ) as well as the similar ion size.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Jian Zhao,Shangbiao Fang,Weixiao Qi,Huijuan Liu,Jiuhui Qu
Biodegradation is regarding as the most important organic micro-pollutants (OMPs) removal mechanism during riverbank filtration (RBF), but the OMPs co-metabolism mechanism and the role of NH 4 + -N during this process are not well understood. Here, we selected atenolol as a typical OMP to explore the effect of NH 4 + -N concentration on atenolol removal and the role of ammonia oxidizing bacteria (AOB) in atenolol biodegradation. The results showed that RBF is an effective barrier for atenolol mainly by biodegradation and adsorption. The ratio of biodegradation and adsorption to atenolol removal was dependent on atenolol concentration. Specifically, atenolol with low concentration (500 ng/L) is almost completely removed by adsorption, while atenolol with higher concentration (100 μg/L) is removed by biodegradation (51.7%) and adsorption (30.8%). Long-term difference in influent NH 4 + -N concentrations did not show significant impact on atenolol (500 ng/L) removal, which was mainly dominated by adsorption. Besides, AOB enhanced the removal of atenolol (100 μg/L) as biodegradation played a more crucial role in removing atenolol under this concentration. Both AOB and heterotrophic bacteria can degrade atenolol during RBF, but the degree of AOB's contribution may be related to the concentration of atenolol exposure. The main reactions occurred during atenolol biodegradation possibly includes primary amide hydrolysis, hydroxylation and secondary amine depropylation. About 90% of the bio-transformed atenolol was produced as atenolol acid. AOB could transform atenolol to atenolol acid by inducing primary amide hydrolysis but failed to degrade atenolol acid further under the conditions of this paper. This study provides novel insights regarding the roles played by AOB in OMPs biotransformation during RBF.
研究领域:
环境科学
·
微生物学
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yujian Rao,Zhenliang Li,Tuo Zhang,Zhehan Wang,Weisheng Li,Xinran Wang,Litao Sun,Yuan Ren,Li Tao
Endowing transition metal dichalcogenides (TMDs) with mesoporous structure can greatly enhance their porosity, accessible specific surface area, and exposed active sites, leading to better performances in applications based on interfacial reactions. Current methods including hard-template (nanocasting) method or thermal-assisted conversion (TAC) still suffer from drawbacks such as cumbersome and environmentally unfriendly process, humidity sensitivity, or ill-defined mesostructures. Herein, the study reports a facile synthesis of ordered mesoporous TMDs/carbon composites by direct organic–inorganic co-assembly in dual solvent (DMF/H 2 O). The amphiphilic block copolymer polyethylene oxide- b -polystyrene (PEO- b -PS) is used as the organic template, and (NH 4 ) 2 MoS 4 or (NH 4 ) 2 WS 4 as the inorganic precursor. After solvent evaporation-induced aggregation assembly and thermal treatments, it results in highly ordered mesoporous MoS 2 , WS 2 , and MoS 2 /WS 2 with highly crystalline framework, high specific surface area (44-91 m 2 g −1 ) and large pore sizes (15–21 nm). Semiconductor gas sensors based on mesoporous TMDs exhibit extraordinary sensing performances toward NO 2 at room temperature, including high sensitivity and ultrahigh selectivity, benefiting from its abundant adsorption sites for gas molecules, fast diffusion rate in well-connected mesopores, and rich edge active sites. This work paves a facile way to develop novel ordered mesoporous TMDs-based semiconductor materials for various applications.
研究领域:
材料科学
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纳米技术
·
化学工程
·
环境科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ao Zhou,Dan Zhang,Zhihong Liu,Zhiyong Liu
With the retirement of rechargeable lithium-ion batteries (LIBs) entering peak period, the recycling of LiCoO 2 has become a hot topic. The spent LiCoO 2 batteries are rich in carcinogenic metal Co and high-value metal Li, so they are needed to be recovered in time before causing serious environmental pollution and resource waste. Thus, a clean and efficient process is proposed for the comprehensive recovery of Li, Co, and Mn from the spent LiCoO 2 cathode material. It is an integrated pyro-hydrometallurgical process, mainly consisting of sulfation roasting with NH 4 HSO 4 and selective sulfurizing leaching with (NH 4 ) 2 S solution. Using low melting point ammonium salt as roasting auxiliary, 99.7 %, 99.1 %, and 99.8 % of Li, Co, and Mn in the spent LiCoO 2 powder can be converted into sulfate when roasting under 400 ℃ for 75 min. Then 99.5 % of Li in the sulfation roasting product can be selectively leached with an aqueous (NH 4 ) 2 S solution, which is also a precipitator for Co, Mn, and impurity Al. In addition, 96.4 % of Co and 96.0 % of Mn in the sulfurized precipitate can be separated with impurity elements Al and C via oxidation roasting–water leaching process. Compared to traditional recycling, this method can achieve a higher Li leaching rate at a low roasting temperature, and the recovery of Co and Mn can be realized without adding any acid/base reagents or impurity cations. More importantly, the circulation of NH 3 /NH 4 + and S element in the recycling system has been taken into account, making it an environmental-friendly and economical process. In this study, the sulfation reduction roasting and selective sulfurizing leaching mechanisms were both revealed in details, and the behavior of the valuable elements was also elucidated.
研究领域:
环境科学
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冶金工程
·
材料科学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yuanjing Wang,Yayun Zhou,Enhai Song
Mn 4+ -activated fluoride red phosphors have a bright prospect for improving the warm white light-emitting diodes (W-LEDs) performances, whereas there remains some challenges in synthesis, such as reducing the consumption of toxic HF and improving Mn 4+ doping efficiency. Herein, a new phosphor (NH 4 ) 2 NaScF 6 :Mn 4+ (NNSFM) was synthesized by an ammonium salt conversion method, which can effectively reduce HF consuming, enhance reaction rate and doping efficiency. The synthesis mechanism, luminescence properties and W-LEDs performances of the as-synthesized NNSFM have been investigated. Moreover, the lattice structure and doping position have been investigated in detail by the density functional calculations (DFT), which show that Mn 4+ could occupy the Sc 3+ crystallographic site in this structure and simultaneously produce a Na vacancy ( V Na ' ) for charge compensation. Using the NNSFM as red-light component, a warm W-LED device with a high color rendering index (CRI, Ra = 80.6) and low correlated color temperature (CCT = 3006 K) has been achieved. This work presents a new Mn 4+ doped fluoride red phosphor and also develops an environmentally friendly strategy for synthesizing Mn 4+ doped fluoride phosphors.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Yuqian Ai,Weiqing Liu,Chunhui Shou,Jin Yan,Nan Li,Zhenhai Yang,Wei Song,Baojie Yan,Jiang Sheng,Jichun Ye
Tin oxide (SnO 2 ) is widely adopted as an electron transport layer (ETL) in perovskite solar cells (PSCs). However, the oxygen vacancies of the SnO 2 not only are the trap states of the nonradiative recombination of photogenerated carriers, but also build the potential barrier of carrier transport. To solve this issue, ammonium sulfide [(NH 4 ) 2 S] is introduced to the SnO 2 precursor for passivating the surface defects by terminating the Sn dangling bonds (S–Sn bonds). After reducing the surface traps, the electron mobility and conductivity of SnO 2 film are enhanced significantly while the carrier recombination is decreased. Additionally, the energy level of S-SnO 2 is also slightly modified. Therefore, this sulfide-passivated mothed remarkably improves the electron collection efficiency of the ETL. Furthermore, the linkage of Sn–S–Pb anchors the perovskite crystals at the perovskite/SnO 2 interface, which increases the electron extraction efficiency and the stability of PSC. Based on this S-SnO 2 ETL, the power conversion efficiency of the PSC is greatly promoted from 18.67% to 20.03%, compared with the reference one. In this study, it is proven that the surface defect passivation of SnO 2 is an efficient and simple method to improve the photovoltaic performance, as a promising ETL for high-efficiency device.
研究领域:
材料科学
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能源科学
·
光伏技术
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Qiya Gao,Zetao Chen,Yongchang Bai,Jie Fu,Ziyue Qin,Shuang Li
With the rapid development of integrated electronic circuit technology, biological fluid-electricity integrated detection systems have gradually become a research hotspot. Researchers have integrated biological fluid electrical detection methods into circuits and developed small, low-power, portable detection devices equipped with sensing electrodes, which can achieve continuous monitoring of human health parameters. In recent years, the integration of reverse iontophoresis technology that can be used to extract body fluids with electrochemical sensors has opened up the possibility of flexible, portable biochemical sensing with excellent detection sensitivity. Herein, we present a method for extracting biofluids based on reverse iontophoresis technology, coupled with electrochemical sensing techniques for the simultaneous detection of various biomarkers in body fluids. The multi-channel sensing electrode was modified layer by layer using nitrogen-doped graphene ( N -Gr), ion-selective membrane, or lactate oxidase for rapid and sensitive detection of pH (3–8), ammonium ion (NH 4 + ) (0.1 mM–50 mM), and lactic acid (1 mM–50 mM). Subsequently, an integrated system for electrical stimulation extraction and sensing analysis based on reverse iontophoresis was established and experimentally tested. Experimental results demonstrated that the multi-channel joint detection sensing electrode has excellent sensing linearity, specificity, repeatability, and long-term stability. Finally, a smartphone-based WeChat applet was developed, which can realize parameter setting, function selection, and result display of sensor detection. In this study, reverse iontophoresis technology was used to collect body fluids, and the important biomarkers pH, NH 4 + , and lactic acid in the body fluids were detected. Overall, this research presents an integrated detection system and a multi-channel sensing scheme for the detection of important biochemical markers in bodily fluids, thereby providing potential value for health monitoring applications.
研究领域:
生物医学工程
·
电化学传感器
·
健康监测
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jiayan Liang,Hongyu Zhang,Jian Zhang,Xuwen Wang,Yangming Wang,Hao Bai,Yi Rong,Kaifeng Lin,Debin Xia,Yulin Yang
Pomegranate-like B@(NH 4 ) 2 SiF 6 @LiClO 4 enables ordered boron combustion. • Sequential fluorination–oxidation suppresses oxide re-passivation. • The optimized composite shows faster ignition and stronger flames. Boron suffers from severely limited combustion efficiency due to the kinetic barrier imposed by its native oxide layer. In this work, a pomegranate-inspired B@(NH 4 ) 2 SiF 6 @LiClO 4 composite was fabricated via a two-step solvent evaporation-induced self-assembly strategy, enabling highly dispersed reactive domains and intimate interfacial contact. The distinctive pomegranate-inspired architecture establishes particle-level spatial organization of the reactive components, while their distinct thermal activation windows provide the temporal basis for a proposed spatiotemporally coordinated reaction pathway. TG-DSC and TG-FTIR analyses reveal that fluorine-containing species derived from (NH 4 ) 2 SiF 6 evolve prior to LiClO 4 melting and major oxidizer release, supporting a proposed sequential fluorination-oxidation pathway involving early fluorine-mediated interfacial modification followed by oxidizer-driven boron oxidation. At an optimal (NH 4 ) 2 SiF 6 content of 10 wt%, the ignition delay and combustion duration are reduced by 15.47% and 68.22%, respectively, compared with B@LiClO 4 , demonstrating substantially improved ignition and combustion kinetics. Combined structural, thermal, and combustion analyses support the proposed spatiotemporally coordinated fluorination-oxidation pathway arising from the coupling of particle-level organization and temporally separated thermal events. This work provides a particle-level interfacial engineering strategy for coordinating fluorination and oxidation in high-performance boron-based energetic systems. A pomegranate-inspired B@(NH₄)₂SiF₆@LiClO₄ enables spatiotemporally ordered boron combustion by coupling fluorination and oxidation reactions within confined nanoscale domains. Sequential interfacial activation and molten-salt-mediated oxygen transport promote continuous reaction propagation and suppress oxide re-passivation, resulting in faster ignition, intensified flame propagation, and more efficient energy release compared with conventional physically mixed systems. Download: Download high-res image (176KB) Download: Download full-size image
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