Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 23
·7654-7661
·
IF 6.4
Jinchan He,Xiao Zhang,Cong Xie,Hsueh Shih Chen,Ping Yang
Because of their inherent ionic properties, inorganic cesium halide lead perovskite nanocrystals (NCs) are normally unstable in light and heat environments as well as polar solvents, which seriously limit their practical application. In this paper, AlO(OH) nanosheets were assembled into hollow mesoporous spheres to encapsulate CsPbX3 NCs for increasing stability according to the powerful adsorption of AlO(OH) on Pb ions. The hollow AlO(OH) assemblies were created via hydrothermal synthesis. The in situ growth of CsPbX3 NCs in AlO(OH) assemblies was then finished in dimethylformamide solutions. After encapsulation, the stability of the NCs was greatly improved and the exchange reaction of halogen ions was effectively prevented. The NCs in the assemblies exhibited high PL quantum yields (PLQYs). Namely, blue-, green-, and red-emitting CsPbX3 (X = Cl, Br, and I)@AlO(OH) composites were fabricated. The composites were further mixed with polystyrene (PS) to prepare a flexible photoluminescent (PL) film with excellent bendable and foldable properties. The initial PLQYs of blue-, green-, and red-emitting CsPbX3@AlO(OH) composites were found to be 48.2, 96.4, and 43.7%, respectively. The films revealed high stability against water because of the excellent hydrophobic properties of PS. These emitting films were made into bands of various shapes, in which their well-flexible nature endowed the films with important applications.
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ChemistrySelect
·
2023
·Vol. 8
·期 23
·e202203483
·
IF 2.1
Wenyao Peng,Shanshan Wang,Junjian An,Chenyang Hu,Jian Zhang,Peng Wang
Graphical GO-Cu 2 (OH) 3 NO 3 composite is prepared by using thermal calcination method. The composite exhibits larger specific surface area and stronger heterogeneous catalysis activity than those of Cu 2 (OH) 3 NO 3 . Under optimal conditions, ferulic acid could be degraded efficiently by heterogeneous process catalyzed by the composite. The environmental-friendly composite exhibits stable chemical properties, which could be reused and recycled successfully. Graphene oxide (GO)-Cu 2 (OH) 3 NO 3 composite was prepared by a thermal calcination process and evaluated as an effective heterogeneous catalytic material. The composite displayed prominent activated performance to persulfate, which was influenced by preparation condition and the reaction parameters in catalytic system. Under optimal reactive conditions, the GO-Cu 2 (OH) 3 NO 3 composite yielded rapid degradation of ferulic acid, which the corresponding apparent rate constant was 1.12×10 −1 min −1 . Catalytic mechanism analysis showed that the main oxygen species were ⋅SO 4 − and ⋅OH. Among them, ⋅OH made the main contribution in the catalytic system. The analysis of degradation intermediates of ferulic acid showed that the compound could be mineralized to small molecules. The remarkable enhanced heterogeneous catalytic performance of GO-Cu 2 (OH) 3 NO 3 was due to a larger specific surface area, high adsorption capacity and a high mass transfer efficiency of oxidizing radicals in the reactive system.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Li Zheng,Chao-Rui Zhang,Dan Zhao,Xuan Wanga,Ting-Ting Du
A β-Ni(OH) 2 flakes modified carbon paste electrode [Ni(OH) 2 /CPE] has fabricated for hydrazine sensing. The β-Ni(OH) 2 flakes derived from nickel hexacyanoferrate (NiHCF) through a facile in situ electrochemical method and characterized by Fourier transform infrared spectrometry, X-ray diffraction, and scanning electron microscopy. Meanwhile, the electrochemical performances of the modified electrode studied by electrochemical impedance spectroscopy, chronocoulometry, cyclic voltammetry, and linear sweep voltammetry. Owing to the large active surface area and enhanced electron transfer efficiency of β-Ni(OH) 2 flakes, the Ni(OH) 2 /CPE showed enhanced catalytic activity toward the oxidation of hydrazine compared with NiHCF/CPE and unmodified CPE. Under the optimized conditions, the amperometric current presented linear dependence on the concentration of hydrazine in the ranges of 0.1 ~ 600 μM with the detection limit of 0.04 μM. Furthermore, the sensor has applied for the determination of hydrazine in water samples.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Zhenzhen Feng,Xiaomeng She,Jian Peng,Yujie Qiang,Song Zhang
Although magnesium alloys have been effectively used in industry, they have weak corrosion resistance. Herein, robust Ni-thiolate coordination polymer Mg(OH) 2 coatings were prepared by an oxidation-hydrolysis-coordination (OHC) strategy to make AZ31 magnesium alloy highly resistant to corrosion in 3.5 wt% NaCl solution. The OHC process includes three steps: I) oxidation of AZ31 to produce AZ31@MgO; II) hydrolysis of MgO to produce Mg(OH) 2 , cation exchange between Mg(OH) 2 and Ni(II) to produce Mg–Ni LDH; III) coordination of Ni(OH) 2 from Mg–Ni LDH by the 1,4-Benzenedithiol (BDT) ligand to produce LDH-BDT coatings. Potentiodynamic polarization, EIS, and in situ SRET in 3.5 wt% NaCl solution were used to assess the hybrid coating's anti-corrosion performance. Surprisingly, LDH-BDT coating achieves excellent corrosion inhibition performance (99.9999%) with the i corr of 1.926 × 10 −10 A cm −2 , which is six orders of magnitude lower than that of AZ31 substrate, this is due to the cooperative effect, such as the physical protection provided by thick LDH-BDT coatings and the hydrophobic properties of Ni(II)-BDT coordination polymers. This study provides fresh insight into the fabrication of Mg(OH) 2 -based coatings modified with Ni-thiolate complex to significantly improve Mg alloys' resistance to corrosion.
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FUEL
·
2023
·
IF 7.4
Wenqi Zhao,Xiaowei Bai,Xiangrui Lin,Yalkunjan Tur sun,Mei Zhong,Zhenghua Dai,Jian Li
Biomass-derived furfural and its derivatives are promising feedstocks for producing valuable C 5 diols by catalytic hydrolysis. However, this process requires selective ring opening of tetrahydrofurfuryl alcohol (THFA) to 1,5-pentanediol, which is challenging. Here we report efficient route for this conversion using Ni-La(OH) 3 catalysts prepared by a green co-precipitation-hydrothermal method. We show that these catalysts can achieve up to 91.7% yield and 94.6% selectivity of 1,5-pentanediol from THFA under mild conditions. We elucidate the key role of the La(OH) 3 phase, the basic sites and the Ni n+ -O-La 3+ structure of the catalysts in promoting the selective hydrogenolysis and ring opening of THFA. We also demonstrate that the co-dehydrogenation of secondary alcohols enables lower reaction pressure and longer catalyst lifetime. Our work provides a sustainable and environmentally benign approach for producing 1,5-pentanediol from biomass-based furfural and its derivatives, which has potential applications in polymer synthesis and green chemistry.
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RSC Advances
·
2022
·Vol. 12
·期 51
·33056-33063
·
IF 4.036
Bo Huang,Zhihua Zhao,Pu Chen,Baocang Zhou,Zhuo Chen,Yu Fu,Hongyu Zhu,Chen Chen,Shuaiwen Zhang,Anbiao Wang,Pu Shi,Xiaoqing Shen
Ammonia (NH3) is a common air pollutant and is a biomarker for kidney disease. Therefore, the preparation of ammonia gas sensors with high sensitivity, good selectivity and low operating temperature is of great importance for health protection. Using the in situ electrostatic self-assembly approach, a chemoresistive gas sensor based on Co(OH)2/Ti3C2Tx hybrid material was created in this study. The prepared samples were characterized by XRD, XPS, TEM, BET and other testing methods for structure, surface topography and elements. These samples were fabricated into sensors, and the gas sensing properties of the materials were investigated under different test conditions. The results show that the gas response value of the C/M-2 sensor is up to about 14.7%/100 ppm, which is three times the response value of the sensor made of pure MXene to NH3. In addition, the Co(OH)2/Ti3C2Tx hybrid sensors exhibit excellent repeatability, high sensitivity under low concentration (less than 5 ppm), fast response/recovery time (29 s/49 s) and long-time stability, which indicates their promising utility in the IoT field.
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Materials
·
2022
·Vol. 15
·期 14
·4909
·
IF 3.748
Yunquan Liu,Huimei Shan,Chunya Zeng,Hongbin Zhan,Yanyue Pang
Graphene oxide and chitosan microspheres modified with α–FeO(OH) (α–FeO(OH)/GOCS) are prepared and utilized to investigate the performance and mechanism for Cr(VI) removal from aqueous solutions and the possibility of Fe secondary pollution. Batch experiments were carried out to identify the effects of pH, mass, and volume ratio (m/v), coexisting ions, time (t), temperature (T), and Cr(VI) initial concentration (C0) on Cr(VI) removal, and to evaluate adsorption kinetics, equilibrium isotherm, and thermodynamics, as well as the possibility of Fe secondary pollution. The results showed that Cr(VI) adsorption increased withC0,t, andTbut decreased with increasing pH andm/v. Coexisting ions inhibited Cr(VI) adsorption, and this inhibition increased with increasing concentration. The influence degrees of anions and cations on the Cr(VI) adsorption in descending order were SO42−> PO42−> NO3−> Cl−and Ca2+> Mg2+> Mn2+, respectively. The equilibrium adsorption capacity of Cr(VI) was the highest at 24.16 mg/g, and the removal rate was 97.69% under pH = 3,m/v= 1.0 g/L,T= 298.15 K, andC0= 25 mg/L. Cr(VI) adsorption was well fitted to a pseudo-second-order kinetic model and was spontaneous and endothermic. The best fit of Cr(VI) adsorption with the Langmuir and Sips models indicated that it was a monolayer and heterogeneous adsorption. The fitted maximum adsorption capacity was 63.19 mg/g using the Sips model under 308.15 K. Cr(VI) removal mainly included electrostatic attraction between Cr(VI) oxyanions with surface Fe–OH2+, and the adsorbed Cr(VI) was partially reduced to Cr(III) and then precipitated on the surface. In addition, there was no Fe secondary pollution during Cr(VI) adsorption.Keywords:hydroxyl iron oxide;graphene oxide;chitosan;Cr(VI) adsorption
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JOURNAL OF CHEMICAL SCIENCES
·
2022
·Vol. 134
·期 3
·1-9
·
IF 2.15
Bao Wanting,You Junhua,Zhao Yao,Wang Lu,Yao Ruyue
Electrochemical water splitting has excellent application prospects in clean energy technology. However, due to the large overpotential required for the OER reaction during the water-splitting reaction, the modification of electrocatalysts is a vital strategy to address the slow kinetics of the OER reaction. In this paper, a simple and rapid two-step hydrothermal sulfidation method was used to prepare S-modified Ni(OH) 2 nanosheets electrocatalysts at 120 °C. At the same time, the well-designed nanostructured catalyst on the nickel foam substrate exposes a large number of active sites, and the simultaneously generated oxygen vacancies are beneficial to the penetration of the electrolyte and release of O 2 , thus significantly improving the OER performance. In 1.0 M KOH electrolyte, Ni 9 S 8 /Ni(OH) 2 /NF exhibits excellent catalytic activity for OER. The catalyst requires only 430 mV overpotential at a current density of 100 mA cm -2 . In addition, Ni 9 S 8 /Ni(OH) 2 /NF also has excellent long-term stability. Graphical abstract This work reports the formation of Ni 9 S 8 /Ni(OH) 2 /NF heterojunctions by sulfiding Ni(OH) 2 on porous nickel foam. Surprisingly, these Ni 9 S 8 /Ni(OH) 2 /NF heterojunctions exhibit excellent oxygen evolution reaction performance and long-term stability. This is superior to most reported electrocatalysts for oxygen evolution reactions.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Pei Shen,Tiansheng Yang,Qichang Li,Zhi Chen,Yonglong Wang,Yunlei Fu,Jun Wan,Zexing Wu,Lei Wang
Developing efficient and stable catalysts for electrocatalytic hydrogen evolution reaction (HER) with low overpotential is the key point to realizing large-scale hydrogen commercialization. Herein, Ru doped amorphous hollow copper hydroxide nanowires on copper foam (Ru-Cu(OH) x /CF) is prepared by surface chemical oxidization and following solvothermal process. The hollow 3D nanowire structure can provide abundant accessibility active sites, promote electrolyte in filtration and facilitate gas diffusion in the process of the electrochemical reaction. Then, the as-synthesized Ru-Cu(OH) x /CF electrocatalyst exhibits impressive electrocatalytic performance for HER with 45, 80 and 50 mV to drive 10 mA cm −2 in 1.0 M KOH, 1.0 M phosphate-buffered saline (PBS) and 0.5 M H 2 SO 4 , respectively, with remarkable long-term stability. Moreover, sustainable energies can power the two-electrode setup with amounts of hydrogen generation. The strategy may be particularly beneficial to explore simple synthesis and high-performance catalysts for HER.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Yuanyuan Li,Hongzheng Pu,Ying Zhou,Fengling Yin,Siwei Chen,Yurou Tang,Pengfei Jiang,Ya Wu,Zhenhua Zhang,Dingfeng Yang
Cation disorder in hydroxide-based perovskites remains relatively under-researched. In this work, novel hydroxide-based perovskite Sn1/3Na2/3Sn(OH)6 was first fabricated by a direct hydrothermal method, and its ability to photodegrade 2,4-dichlorophenol was evaluated. The synthesized photocatalyst is isostructural with MSn(OH)6 (M = Mg, Ca, Sr, Mn, Fe, Co, Ni, or Zn), where the M site is occupied by disordered Sn4+/Na+. Sn1/3Na2/3Sn(OH)6 exhibits outstanding photocatalytic activity under ultraviolet light. Specifically, 99% of 2,4-DCP is photodegraded in 40 min, with approximately 94% of its total chlorine content converted to Cl– anions. Radical trapping experiments indicated that superoxide radical anions (·O2–) play a critical role during the photocatalytic process. Finally, liquid chromatography–tandem mass spectrometry was conducted to monitor the photocatalytic intermediates. Overall, our findings demonstrate that hydroxide-based perovskites with cation disorder show promise for application in photocatalysis.
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CRYSTENGCOMM
·
2022
·Vol. 24
·期 26
·4764-4771
·
IF 3.756
Tingting Fan,Yan Ke,Lijun Zhang,Li Cai,Zhongbo Li
Large-area three-dimensional (3D) well-ordered Co(OH)2 nanoflower array films decorated with Ag nanoparticles (Ag NPs) with a novel structure were designed as sensitive SERS substrates for trace detection of pesticides. Co(OH)2 nanoflowers were electrodeposited on the surface of molded polyacrylonitrile (PAN) films with ordered nanopillar arrays and then Ag NPs were sputtered onto of the surface of each Co(OH)2 nanoflower. The SERS performance of the as-prepared films can be optimized by tuning the Ag-sputtering duration and the morphology of the Co(OH)2 nanoflower arrays. Owing to the formation of high-density SERS “hotspots” created in the nanogaps between the adjacent Ag NPs located on the same and neighbouring Co(OH)2 nanosheets, the optimized substrates show SERS activity for probe molecules. As a result, 10−11 M rhodamine 6G and 10−9 M 4-aminothiophenol can be SERS recognized, respectively. To verify their practical application, the optimized SERS substrates were employed for trace detection of thiram (a type of pesticide), and 10−9 M thiram can be recognized, showing great potential in pesticide detection.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Linchen Xie,Anqi He,Da Li,Tianyi Li,Limin Yang,Kun Huang,Yizhuang Xu,Guozhong Zhao,Jingyu Liu,Kexin Liu,Jia’er Chen,Yukihiro Ozaki,Isao Noda
Single-crystal structures of myo-inositol complexes with erbium ([Er2(C6H11O6)2(H2O)5Cl2]Cl2(H2O)4, denoted ErI hereafter) and strontium (Sr(C6H12O6)2(H2O)2Cl2, denoted SrI hereafter) are described. In ErI, deprotonation occurs on an OH of myo-inositol, although the complex is synthesized in an acidic solution, and the pKa values of all of the OHs in myo-inositol are larger than 12. The deprotonated OH is involved in a μ2-bridge. The polarization from two Er3+ ions activates the chemically relatively inert OH and promotes deprotonation. In the stable conformation of myo-inositol, there are five equatorial OHs and one axial OH. The deprotonation occurs on the only axial OH, suggesting that the deprotonation possesses characteristics of regioselectivity/chiral selectivity. Two Er3+ ions in the μ2-bridge are stabilized by five-membered rings formed by chelating Er3+ with an O–C–C–O moiety. As revealed by the X-ray crystallography study, the absolute values of the O–C–C–O torsion angles decrease from ∼60 to ∼45° upon chelating. Since the O–C–C–O moiety is within a six-membered ring, the variation of the torsion angle may exert distortion of the chair conformation. Quantum chemistry calculation results indicate that an axial OH flanked by two equatorial OHs (double ax–eq motif) is favorable for the formation of a μ2-bridge, accounting for the selectivity. The double ax–eq motif may be used in a rational design of high-performance catalysts where deprotonation with high regioselectivity/chiral selectivity is carried out.
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