Arabian Journal of Chemistry
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2022
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IF 6.212
Jiaxin Li,Chen Zhou,Huan Zhang,Yue Hou,Qingqing Pan,Jing Sun,Xiao Li
In this work, a new highly selective and sensitive fluorescent sensor for detecting Cu 2+ was developed based on rhodamine fluorophore. It displayed strong fluorescence “turn-on” effect upon addition of Cu 2+ , and possessed the function of naked eye recognition. The fluorescence enhancement also enabled the sensor to quantitatively analyze Cu 2+ due to the formation of a stable 1:1 metal–ligand complex in a short time, and the complex possesses relatively good pH stability. In addition, the density functional theory calculations were adopted to investigate the molecular orbitals as well as the spatial structure. Simultaneously, the cell imaging and zebra fish experiments provided a broader application prospect in biological system.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Hang Yu,Dewang Li,Huayu Bao,Zhenhu Zhang,Hongli Liu,Fei Zhang,Shirong Wang
The efficiency and long-term stability of perovskite solar cells are severely limited by the challenges of the surface defects and the perovskite degradation caused by moisture and Li+ diffusions. To overcome these disadvantages, a multifunctional cross-linked interfacial layer of poly(V-TPAFDPA-co-PETMP) by copolymerization of V-TPAFDPA and PETMP is introduced between the Cs0.05(FA0.83MA0.17)0.95Pb(Br0.17I0.83)3 perovskite and the hole transport layer (HTL). The unique cross-linked structure incorporates the highly conjugated units from V-TPAFDPA benefiting hole extraction and moisture prevention, as well as the −S– and C═O groups from PETMP for surface defect passivation. Moreover, the cross-linked network shows improved stability against the subsequent solvent treatment for HTL preparation and Li+ penetration. An ameliorated power conversion efficiency from 20.18 to 21.19% is achieved with the cross-linked interlayer, and the long-term stability under moisture, illumination, or elevated temperature is also improved, which highlights our effective design on the multirole cross-linked interfacial materials.
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高影响因子
Nano Energy
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2022
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IF 19.069
Zhaojing Han,Gang Wang,Jie Zhang,Zhiyong Tang
It is of great significance to develop cost-effective electrocatalysts for efficient and durable hydrogen evolution reaction (HER) in alkaline media to meet the increasing demand of hydrogen. Here, we report a photo-curing 3D printing method for manufacturing directly the structured nickel-based electrocatalysts with unique gluten-like cubic structure and strong catalyst-substrate interaction. With incorporation of amorphous titanium, the tailored Ti-Ni NS electrode exhibits excellent durability, a Tafel slop of 74 mV dec −1 of the HER, and a remarkable low overpotential of 34 mV at a current density of 10 mA cm −2 , surpassing the commercial Pt/C catalyst and most of the state-of-the-art electrocatalysts. Density functional theory calculations further confirm that the Ti doping decreases significantly the energy barriers in the Volmer and Heyrovsky steps, thus favoring the HER. This work opens a new window of precisely preparing the structured noble-metal-free catalysts with enhanced activity in alkaline water electrolysis (AWE).
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高影响因子
RSC Advances
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2022
·Vol. 12
·期 36
·23215-23220
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IF 4.036
Mingxin Luo,Bo Sun,Chen Zhou,Qingqing Pan,Yue Hou,Huan Zhang,Jing Sun,Chenyang Zou
In this research, a novel selective and sensitive fluorescent sensor for detecting Fe3+ was designed and synthesized; it revealed an obvious fluorescence quenching effect upon addition of Fe3+, and possessed the quantitative analysis ability on account of the formation of a 1 : 1 metal–ligand complex. Furthermore, the density functional theory calculations were utilized to study the molecular orbitals as well as the spatial structure. Simultaneously, the cell experiments and zebra fish experiments verified the application value of the sensor in the biological field.
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PubMed
高影响因子
INTERMETALLICS
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2022
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IF 4.075
Chengyi Xu,Xiaoping Cai,Xinyang Jiao,Yang Yu,Xiaohong Wang,Jianzhong Wang,Lu Zhu,Peizhong Feng
Porous CoAl 3 is a candidate material in the field of catalytic due to its high porosity, good thermostability and quasicrystal structure. However, its rapid preparation are still a challenge, and the oxidation resistance need to be further investigated. In this work, we have rapidly prepared porous CoAl 3 by thermal explosion (TE) reaction and studied its oxidation process . The results show that two exothermic peaks at 616 °C and 646 °C, corresponding to the solid-phase diffusion and TE reaction, respectively. The heat released from the two reactions led to the expansion of the compact, which reached a maximum of 104% at 800 °C, and the corresponding open porosity reached at 53%. The pore sources include the original pores during the green compact pressing process, the Kirkendall pores generated by the solid-phase diffusion process and the in-situ pores generated by the Al consumption after the TE occurs. The cyclic oxidation of porous CoAl 3 at 700 °C for 130 h only increased the weight by 1.52%, forming a continuous protective oxide film on the surface of the skeleton. It has been found that porous CoAl 3 can combine the oxidation resistance of Co–Al monoliths alloys and the high porosity of porous materials, which have potential applications in the field of catalysis such as methanation at 600–700 °C.
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INTERNATIONAL JOURNAL OF COAL GEOLOGY
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2022
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IF 6.3
Yanan Yang,Ningning Zhong,Jia Wu,Yueyang Pan
Under hot, deep-basin conditions, hydrogen-to-carbon ratios of residual kerogen are low. Whether ubiquitous water in sedimentary environments contributes hydrogen directly to hydrocarbon gas formation through organic-inorganic interactions is, therefore, critical for natural gas generation. Accordingly, we conducted laboratory experiments on immature to overmature kerogens at 300–600°C and 700 bar to examine the chemical interactions between kerogens and fluid under varying redox states and hydrothermal conditions. Mineral buffers, comprised of magnetite-hematite, nickel‑nickel oxide, cobalt‑cobalt oxide, and molybdenum‑molybdenum trioxide, were added to the experiments to control the redox state of the fluid from geologically reasonable to generally excessive values. The kerogens and mineral buffers were spatially isolated using double-capsule techniques to prevent contact catalysis. Our results indicated that chemical interactions between kerogens and water depended strongly on the kerogen thermal maturity and fluid redox state. The chemical interactions of overmature kerogens with reducing water were stronger than those of immature kerogens, which could be ascribed to the weaker competitive transfer of hydrogen from organics to organics than from water to organics. Unexpectedly high amounts of hydrocarbon gas were generated by incorporating water-derived hydrogen in the pyrolysis of overmature kerogens, and the yields increased under low to high reducing fluid conditions for a given temperature. Along with the increasing thermal maturity, residual kerogen eventually became ineffective for hydrocarbon gas generation through reduction reactions. Demethylation, bridge bond cleavage reaction, aromatic structure ring opening reactions in residual kerogen and subsequent redox reaction of intermediate products with reducing fluids is evidenced as the possible reaction mechanisms. The produced hydrocarbon gas under f H 2 level of oilfield water is characterized by high dryness (99 mol%) and more-enriched 13 C in CH 4 compared with precursors. Natural gas deep within the Sichuan and Appalachian basins with similar characteristics suggests that our simulated organic–inorganic interactions could occur widely under natural conditions. Consequently, a potentially prolific source of natural gas may be formed by the overmature source rocks in the deep basin and fluid redox should be considered for gas potential evaluation of overmature source rocks.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yujiao Wen,Meng Liu,Shikai Li,Lezhu Su,Yifan Wang,Zhi Zhou,Nan Zhou,Ruilian Li
Antibiotics accumulated in ecosystem can easily enter the agricultural cycle with irrigation water, which brings a huge potential threat to food security. Transition metals are widely utilized in advanced oxidation processes to degrade pollutants, but the poor stability has significantly impeded their application in irrigation water. To solve these problems, the harmless tetrasodium iminodisuccinate is selected to pyrolysis with ferrite and cobalt resources to obtain a composite heterogeneous catalyst composed of porous carbon and Co 3 Fe 7 , CoFe 2 O 4 (IDC@Co 3 Fe 7 /CFO). The catalyst exhibits excellent catalytic performance in peroxydisulfate (PDS) activation and shows a high removal efficiency of sulfamethazine up to 100%. The ESR analysis proves SO 4 • − , •OH and •O 2 – are the main active substances, and sulfamethazine can be gradually degraded until mineralization. More importantly, with the formation of Metal-Metal/Metal-Oxygen bonds and the protection of the IDS derived carbon, the dispersion and stability of the metal can be greatly promoted. The composite can maintain the rate of degrading sulfamethazine above 93.44% after 10 times catalytic reactions , with extremely low detection of Fe or Co leaching. This study not only give a super-stable material for the removal of antibiotics in irrigation water, but also provides a novel stratagem for obtaining stable catalytic structures.
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高影响因子
MATERIALS CHARACTERIZATION
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2022
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IF 4.537
Z. Sun,X.X. Zhu,H.Z. Chen,L.X. Zhang
To address the excessive formation of brittle compounds when brazing TiAl alloys, a TiZrHfCoNiCu high-entropy brazed filler was developed to realize the brazing of TiAl/Ti 2 AlNb couples. The TiAl/Ti 2 AlNb brazed joints can be divided into 4 zones, i.e., 2 diffusion zones at the TiAl/braze filler, Ti 2 AlNb/braze filler interfaces and 2 zones divided inside the brazed seam. α 2 + γ-TiAl were the main reaction products formed at the TiAl/braze filler interface and α 2 + Ti 0.5 Al 0.12 Nb 0.38 were the main reaction products at the Ti 2 AlNb/braze filler interface. Effects of brazing temperatures on the interfacial microstructure and mechanical properties of the TiAl/Ti 2 AlNb brazed joints were investigated. When brazing at 1100°C/15 min, the highest shear strength can reach 157 MPa (room temperature), and 123 MPa (650°C) respectively. The relationship between the microstructure and the corresponding mechanical response were discussed in detail. This research can offer new insights on developing desirable brazing filler when joining TiAl and TiAl based alloys.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Xin Fan,Yaqi Chen,Qi Chen,Yao Wang,Dayi Zhou,Lijie Chang,Xinjian Li,Yuewen Zhang,Hongan Ma,Xiaopeng Jia
A series of graphene-S 0.05 Co 4 Sb 11.6 Te 0.4 (C x -S 0.05 Co 4 Sb 11.6 Te 0.4 ) composite polycrystalline skutterudite materials with graphene stoichiometric ratio of x = 0, 0.05, 0.10, 0.20 have been successfully prepared by high pressure and high temperature (HPHT) technology. Graphene is a two-dimensional material with large carrier mobility and large specific surface area. Through microscopic observation, it is found that graphene is attached to the grains in the sample. At the same time, with the increase of graphene content, grain growth is inhibited. Graphene addition reduces the thermal conductivity of skutterudite by increasing grain boundaries and achieves the purpose of optimizing its thermoelectric properties. At the same time, there are numerous lattice defects and distortions introduced in skutterudite synthesized by HPHT technology. Finally, the samples were synthesized under the conditions of 1.5 GPa and 900 K. The lattice thermal conductivity of the graphene composite sample C x -S 0.05 Co 4 Sb 11.6 Te 0.4 with x = 0.10 reaches a minimum of 0.99 at 773 K, and the zT value of this sample is 1.25 at 773 K, which is greater than pure S 0. 05 Co 4 Sb 11.6 Te 0.4 , its zT value is 1.00 at 773 K. Compared with the method of synthesizing skutterudite under normal pressure, the HPHT technology can dramatically reduce the reaction time from several days to less than 30 min, while forming a high-pressure airtight reaction environment, which can effectively prevent the volatilization and oxidation of samples during the reaction process, thus providing a convenient method for synthesizing thermoelectric materials quickly and efficiently.
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高影响因子
POWDER METALLURGY
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2022
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IF 2.228
Ying Zhang,Meng Xiao,Yi-min Zhou,Yi-fu Shen
The eutectic FeNiCoCrTi0.6Nb0.4 high-entropy alloy coating (HEAC) is annealed in Argon at 450°C, 850°C and 1050°C to investigate the thermal stability. The results show that annealed coatings are all composed of BCC solid solution and Laves phase with no production of new phases. The fine eutectic cells can be maintained at a higher temperature in that continuous intracellular coarsening does not occur until annealing at 1050°C. With the increase of annealing temperature, the microhardness and wear resistance of FeNiCoCrTi0.6Nb0.4 coating increase first and then decrease slightly. Especially, the microhardness of FeNiCoCrTi0.6Nb0.4 annealed at 1050°C is only 6.03% lower than that of unannealed one, and the wear rate is only 10.70% higher than that of unannealed one, which strongly indicates that eutectic FeNiCoCrTi0.6Nb0.4 HEAC has excellent thermal stability and can be well applied in high-temperature environments.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wensen Liu,Hui Su,Jian Zhang,Lina Wang,Yahui Liu,Jie Liang,Zhaowu Zhu
The hydrometallurgical process for the recovery of nickel and cobalt requires a complex and expensive impurity removal process. Solvent extraction is widely used in industry for the separation, purification, and concentration of metals. However, current commercial extractants encounter some difficulties when cobalt and nickel are extracted from solutions containing a large amount of impurities such as manganese and calcium. There is an urgent need to develop new reagents for the selective extraction of Ni and Co. In this study, N-(2-ethylhexyl)-pyridine-4-carboxamide (NEHPCA) was synthesized, and the metal extraction capacity of its synergistic solvent extraction (SSX) system with dinonylnaphthalene sulfonic acid (DNNSA) and tributyl phosphate (TBP) modifier was examined. The experimental results show that the selectivity of the new SSX system has the order Cu > Ni > Co > Zn > Mn > Ca > Al ≈ Cr (III) ≈ Mg ≈ Fe (III), with excellent selectivity for nickel and cobalt. Using an organic phase composed of 0.7 M NEHPCA, 0.35 M DNNSA, and 0.2 M TBP under 1:1O/A operation, after three-stage theoretical extraction, more than 99% of nickel and cobalt can be recovered from a synthetic leaching solution of nickel laterite ore. Mechanistic studies showed that NEHPCA and water molecules participate in the internal coordination of metals, and DNNSA provided coordination anions to achieve charge balance, forming the Ni complex in this SSX system which existed most likely in the form of [Ni(NEHPCA) 2 (H 2 O) 4 ](DNNS) 2 in the organic phase.
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高影响因子
AICHE JOURNAL
·
2022
·Vol. 68
·期 4
·e17564
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IF 4.167
Yongjin Cui,Jing Song,Chencan Du,Jian Deng,Guangsheng Luo
The nitration of chlorobenzene with concentrated mixed acids is a fast and highly exothermic process, which suffers from considerable mass transfer resistance and poor heat transfer rates. The reaction kinetics has not been thoroughly reported before. In this work, a continuous-flow microreactor system and a homogeneous reaction condition were proposed to obtain accurate chlorobenzene nitration kinetics parameters at high mixed acid concentrations. A general model for predicting the observed reaction rate constants was established. With a new method for estimating the equilibria associated with HNO 3 in aqueous sulfuric acid, the rate constants based on nitronium ion and activation energies were obtained. Compared with batch reactors, the continuous-flow microreactor system allows for a sufficient heat transfer efficiency and accurate residence time control, making it possible to study the reaction performance more quickly and sensitively. This work may provide a reliable reference for the kinetic study of similar processes.
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高影响因子
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