RSC Advances
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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
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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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Journal of Energy Storage
·
2022
·
IF 8.907
Jiahui Fan,Aiying Chen,Xiaofeng Xie,Lijian Gu
Three-dimensional (3D) hybrids are very valuable in the construction of supercapacitor electrodes. Ni(OH) 2 cellular arrays were in-situ grown on nickel foam using Co 3 O 4 nanosheets (NSs) as nucleating agent. The formation, microstructure and supercapacitance performance of the Co 3 O 4 /Ni(OH) 2 cellular arrays are systematically investigated. The Co 3 O 4 /Ni(OH) 2 arrays present an open cellular nanostructure with ultrathin Ni(OH) 2 walls. The Co 3 O 4 /Ni(OH) 2 prepared by hydrothermal reaction of 12 h delivers a super-high specific capacitance of 4396 F g −1 at 1 A g −1 , above the theoretical capacitances of both the Ni(OH) 2 and Co 3 O 4 . Additionally, the Co 3 O 4 /Ni(OH) 2 electrode shows an excellent cycle performance by retaining 80.1% after 5000 cycles and a stable rate capability by decreasing 21.1% from 1 to 10 A g −1 . The assembled asymmetric supercapacitor reaches a large energy density of 32 Wh kg −1 at 7999 W kg −1 by Co 3 O 4 /Ni(OH) 2 as anode and reduced graphene oxides as cathode. The prominent high-capacity performance can be attributed to the cellular arrays, ultrathin hybrid NSs and synergetic reactions of the Ni(OH) 2 and Co 3 O 4 . The proposed technology is also suitable for producing other multi-component oxide/hydroxide arrays as electroactive materials for energy storage devices.
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Yuxuan Qin,Chen Hang,Liping Huang,Haiyun Cheng,Junqing Hu,Wenyao Li,Jianghong Wu
In this study, Sn@C composite was fabricated from ZnSn(OH) 6 through a green thermal calcination method. For the first time, this composite was used as a modifier on glassy carbon electrode (GCE) to construct an electrochemical biosensor to detect acetaminophen (AC). The Sn@C sensor exhibited distinctly enhanced performance in electrochemical response to AC compared with bare GCE, GCE modified with Sn and GCE modified with graphene. The linear range is 0.2–100 μM and the limit of detection (LOD) is 0.020 μM based on DPV analysis. The excellent electrochemical behavior can be ascribed to the outstanding conductivity of metal Sn and carbon, and the strong adsorption of the carbon layer to AC. Most importantly, the chemical interaction between Sn and C through Sn-C bond facilitated the electron transfer process in the electrooxidation of AC. Finally, the Sn@C sensor was successfully applied in pharmaceutical samples and spiked serum samples to detect AC with satisfactory recoveries.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Jiang Liao,Ao Ju,Wenhao Jiang,Yan Ju,Xueliang Liu,Nianxiang Hu,Ruidong Xu,Junli Wang
Transition metal hydroxides, due to their low cost and high theoretical capacity, are promising candidates for supercapacitors . However, the lower conductivity of hydroxides usually results in devices exhibiting poor specific capacity. Here, Ni(OH) 2 @Ni 12 P 5 electrodes are designed and prepared, showing great potential for applications. This composite electrode, prepared by simple phosphating treatment and electrodeposition . Compared with the Ni(OH) 2 prepared by direct deposition, this rationally designed electrode exhibits more excellent electrochemical properties. The prepared Ni(OH) 2 @Ni 12 P 5 electrode exhibits a good area specific capacitance of 15.89 F•cm −2 at a current density of 10 mA•cm −2 , which is 2.93 times higher than that of the Ni(OH) 2 electrode (5.43 F•cm −2 ). In addition, the assembled Ni(OH) 2 @Ni 12 P 5 //AC asymmetric supercapacitor exhibits an energy density of 0.38 mWh•cm −2 at a power density of 8.00 mW•cm −2 . Therefore, this work provides a new strategy for the synthesis of high-performance supercapacitor electrodes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yuying Jiang,Jing Xie,Zhenjiang Lu,Jindou Hu,Aize Hao,Yali Cao
Surface modification by hydrophilic functional group have a tremendous influence on the catalytic activity of photocatalyst , however, there are few reports on improving piezoelectric catalytic performance through surface functionalization . Herein, OH-modified SrTiO 3 was successfully obtained via a novel low-temperature solid-state precursor method and employed as a catalyst for photocatalytic , piezocatalytic and piezo-photocatalytic hydrogen production . Thanks to the super hydrophilic that is facilitating the contact of catalyst and water molecular and the more oxygen vacancies that can promote electron-hole separation, the photocatalytic, piezocatalytic and piezo-photocatalytic hydrogen generation of OH-modified SrTiO 3 (OH-STO) is about two times higher than pristine SrTiO 3 (STO). It is worth mentioning that the optimal piezo-photocatalytic hydrogen evolution rate of OH-STO (701.2 µmol h −1 g −1 ) is 5.3 times higher than the photocatalytic hydrogen evolution process of STO. This study presents a low-energy approach to the rational design of functional group modification nanomaterials that possess excellent piezo-photocatalytic performance.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Jie Yang,Huan Zhou,Jie Li,Cunbing Xu,Yifan Li,Sifan Wang,Jiangbo Chen
The solid–liquid phase equilibria of the Ba2+//Cl–, S2–, and OH––H2O quaternary system and its three subternary systems at 298.15 K are studied via the isothermal solubility phase equilibrium method. The solubility data, liquid properties of density and pH, and phase diagrams of the ternary and quaternary systems are obtained. Solid species of Ba(OH)2·8H2O, BaCl2·2H2O, Ba(OH)Cl·2H2O, and BaS exist in the quaternary system and corresponding ternary systems at 298.15 K. The four solid species build up two invariant points, one disproportionate and one proportionate, and four phase regions. The largest phase area is covered by Ba(OH)·8H2O, and the lowest water point is the proportionate invariant point saturated by BaCl2·2H2O, Ba(OH)Cl·2H2O, and BaS.
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