ELECTROCHIMICA ACTA
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2018
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IF 5.116
Danfeng Jiang,Zhenyu Chu,Jingmeng Peng,Jingyi Luo,Yangyang Mao,Pengqi Yang,Wanqin Jin
Currently, most metal oxides- or hydroxides-based and non-enzymatic sensors require a high alkali concentration in the working environment. Here, we designed a novel non-enzymatic sensor based on a 3D nanostructured Co(OH) 2 /rGO film to address this issue. The architecture of the hybrid film was in-situ constructed by the dense assembly of 200 nm flower-like Co(OH) 2 crystals bridged by rGO nanosheets . This structure possessed an extremely large specific surface area and an excellent conductivity which were beneficial for adsorbing OH to produce oxidative CoOOH or CoO 2 , even in a low alkaline condition. This material was able to mimic the functionality of glucose oxidase to oxidize glucose to gluconolactone and exhibited a good sensitivity at a wide alkaline range from 5 × 10 −3 to 1 mol L −1 NaOH solution. Moreover, this sensor showed a wide linear range, excellent selectivity, reproducibility and stability for real blood analysis.
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POWDER TECHNOLOGY
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2018
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IF 3.23
Weiwei Chu,Zhenzhen Lu,Ruiqin Tan,Shihui Tang,Wei Xu,Weijie Song,Junhua Zhao
In this work, β-SrHPO 4 , Sr 3 (PO 4 ) 2 , and Sr 5 (PO 4 ) 3 (OH) (SrHAp) powders were successfully prepared by a controllable hydrothermal method and were utilized in removal of lead ion (Pb 2+ ). The effects of pH value, contact time and initial ion concentration on the immobilization of Pb 2+ were investigated systematically. Results showed that β-SrHPO 4 exhibited a capacity of 1438 ± 45 mg/g for Pb 2+ , while Sr 3 (PO 4 ) 2 and SrHAp showed values of 1223 ± 45 mg/g and 543 ± 45 mg/g respectively under the optimum conditions. The XRD , SEM and EDX results revealed that the mechanism of Pb 2+ immobilization by β-SrHPO 4 , Sr 3 (PO 4 ) 2 and SrHAp was mainly due to a process of dissolution and precipitation in the acidic solution. Comparing the immobilization behavior and capacities of β-SrHPO 4 , Sr 3 (PO 4 ) 2 and SrHAp for Pb 2+ removal, it is shown that β-SrHPO 4 is an effective and eco-friendly material for the removal of Pb 2+ from acidic aqueous solutions among strontium phosphates materials.
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DALTON TRANSACTIONS
·
2024
·Vol. 54
·期 1
·144-151
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IF 3.5
Yuan Rui,Zong Li,Miaohui Wang,Yunxia Liu,Haiping Lin,Peipei Huang,Qing Li
Developing electrocatalysts with fast reaction kinetics for the urea oxidation reaction (UOR) in the field of sustainable hydrogen production through urea-assisted water splitting remains challenging. Here, Ni1−xO/Ni(OH)2 supported on nickel foam (Ni1−xO/Ni(OH)2/NF) is prepared via a defect engineering strategy by combining Zn doping and acid etching. The doped Zn species are partially removed, facilitating the formation of NiOOH during acid etching. Residual Zn species modulate the electronic structure of nickel sites, which intrinsically accelerate the reaction kinetics of Ni1−xO/Ni(OH)2/NF. Ni1−xO/Ni(OH)2/NF exhibits excellent performance for the UOR with a low potential of 1.346 V versus the reversible hydrogen electrode to attain 100 mA cm−2, fast reaction kinetics (18.7 mV dec−1), and excellent stability in an alkaline electrolyte. The enhanced reaction kinetics of Ni1−xO/Ni(OH)2/NF are clearly elucidated by operando electrochemical impedance spectroscopy and in situ Raman spectroscopy. Our study offers an effective approach for designing promising Ni-based UOR catalysts for the practical application of urea-assisted water splitting.
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Journal of Energy Storage
·
2025
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IF 9.8
Shakeel Ahmad,Muhammad Tariq,Umar Farooq,Henmei Ni,Afaq Ullah Khan,Zainab M. Almarhoon,Abdulaziz A. Alanazi,Talal M. Althagafi,Kamran Tahir,Sameerah I. Al-Saeedi
The integration of Cobalt hydroxide fluoride Co( OH )F-based materials is expected to significantly enhance the electrochemical performance of supercapacitor electrodes. In this work, Co( OH )F with various morphologies was synthesized using a simple hydrothermal method and evaluated as an electrode material for supercapacitors. The porous nano square-like morphology exhibited excellent durability in electrochemical reactions, providing abundant active sites. Furthermore, the highly electronegative fluorine atom contributes to fast ion diffusion to electrode surface and reduces intrinsic resistance during the reaction, leading to remarkable electrochemical performance. Remarkably, the optimized Co( OH )F 450 exhibited an ultrahigh specific capacitance of 558 F g −1 at a current density of 1 A g −1 , which is greater than that of Co( OH )F 300 , and Co( OH )F 150 electrodes. Furthermore, the device delivered outstanding cyclic performance, maintaining 80 % capacitance retention after 10,000 charge-discharge cycles. Finally, the Co( OH )F 450 electrode demonstrates a promising energy density of 27 Wh kg −1 at a power density of 2571 W kg −1 . Above results suggest that Co( OH )F 450 electrode could pave way for the development of high-performance electrodes in the field of energy storage.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jiazhuo Song,Fang Li,Xinying Zou,Hamed Alshawwa,Minghan Chi,Guinong Qiao,Ruijing Shang-Guan,Wenjun Tang,Lihua Hong,Zhimin Zhang
Limited by local H 2 O 2 concentration and GSH hindrance, chemodynamic therapy (CDT) has poor antibacterial efficiency, and the pro-inflammatory response caused by CDT is often ignored. Here, a hybrid nanozyme (Fe 3 O 4 -CaO 2 -PDA) was synthesized, which has dual regulatory functions of ·OH and GSH, there are two stages in clearing the infection: treatment and repair. In the treatment stage, stimulated by the photothermal generated by near-infrared light (NIR), it rapidly releases a large amount of ·OH and further enhances CDT by decreasing the local GSH concentration to achieve a rapid antimicrobial effect. In the repair stage, the PDA removes the local residual ·OH, prevents over-aggregation of inflammatory cells, and regulates pro-inflammatory responses. In vitro antibacterial experiments showed that the killing rates of the hybrid nanozyme against S. aureus and E. coli were 90% and 92% respectively. At the same time, the DCFH-DA fluorescence experiment showed that the ·OH concentration was significantly controlled. in vivo, due to the function of control ·OH, nanozymes show the ability to promote collagen regeneration and regulate inflammation. In summary, this study proposed a synergistic multiple antibacterial strategy and successfully constructed a PTT-enhanced multifunctional hybrid nanozyme for efficient CDT anti-infective treatment.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Liying Sheng,Zhenjiang Li,Alan Meng,Qinhai Xu
The novel nanocomposite of Ni(OH) 2 nanoparticles over reduced graphene oxide and poly (3,4-ethylenedioxythiophene) hybrid film (Ni(OH) 2 @PEDOT-rGO) have been successfully fabricated via a facile, scalable and easy-to-control electrodeposition method. The characterization results of scanning electron microscope (SEM) and electrochemical techniques show that Ni(OH) 2 nanoparticles with an average particle size about 10 nm are uniformly deposited on PEDOT-rGO hybrid film with rough surface and reveal outstanding performance for detecting glucose. The enzyme-free glucose sensor exhibits an ultrafast response time (< 1 s), a wide linear range (0.002–7.1 mM), a low detection limit (0.6 μM) and a high sensitivity (346 μA mM −1 cm −2 ). Moreover, the sensor also displays superb selectivity, excellent reproducibility and good stability. The outstanding properties of the sensor may be attributed to the synergistic effect of Ni(OH) 2 nanoparticles possessing high electro-catalysis activity and PEDOT-rGO having well conductivity. More importantly, the sensor was successfully used to determine glucose in the real samples. In addition, the mechanism of electrodeposited PEDOT-rGO and glucose oxidase was investigated.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
·
IF 4.7
Mengyao Hua,Siyi Wang,Meng Cheng,Guangming Liang,Lei Xu,Yafen Zhou
Photocatalysts TiO 2 @UiO-66-(OH) 2 was successfully synthesized via an impregnation method for removal of formaldehyde under high pressure mercury lamp irradiation, and the photocatalysts were characterized by using a variety of analytical techniques. The characterized results indicated that TiO 2 was attached to the surface of UiO-66-(OH) 2 , and there was a strong electronic interaction between the elements of TiO 2 and UiO-66-(OH) 2 in the composite. The synergistic combination of high adsorption capacity of UiO-66-(OH) 2 , high dispersion of TiO 2 and efficient interfacial charge transfer between UiO-66-(OH) 2 and TiO 2 have a significant impact on the enhanced photocatalytic performance for formaldehyde removal. And the hydroxyl radicals (⋅OH) and superoxide radicals (⋅O 2 − ) also play a major role in removal of formaldehyde. The formaldehyde removal rate of 20TiO 2 @UO (1 g 0.15 m 3 ) is 83.01 % within 5.5 h, if the removal time is extended to 24 h, the formaldehyde removal rate can reach 91.49 %, and the continuous photocatalytic reaction showed that the composite is a highly stable catalyst. This could provide a useful method for highly efficient formaldehyde in indoor air purification.
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ACS Nano
·
2025
·
IF 16
Qu Jiang,Sihong Wang,Ziyang Sheng,Chaoran Zhang,Haoyue Zhang,Haofei Wu,Pan Liu,Peng Fan,Fang Song
Traditional electrochemical redox assessments offer insights into material properties for charge storage and catalytic kinetics but often fail to link these to specific surfaces, obscuring the structure–performance relationship. Here, we reveal the facet-dependent electrochemical redox behaviors and their connection to oxygen evolution reaction (OER) catalysis using Co(OH)2 nanosheets and nanorods as models. By correlating redox charge storage capacity and kinetics with distinct exposed surfaces, we uncover diffusion-controlled redox processes on the basal surface and non-diffusion-controlled behavior on the lateral surface and further utilize the distinct redox charging kinetics to differentiate the two. Integrated microscopic, spectroscopic, and electrochemical analyses reveal redox-active regions with a thickness of ∼12 Co atoms on the lateral surface and 85% Co atom equivalent extension on the basal surface, yielding benchmark redox charge capabilities of 3.04 mC cm–2 for the lateral surface and 0.35 mC cm–2 for the basal surface. By linking the surface-specific redox charges to catalytic performances, we find that the catalytic activity correlates with the lateral surface exclusively, corresponding well with previous demonstration of the catalytic reactivity of the lateral surface and the inertness of the basal surface. This work clarifies dynamic, heterogeneous, and anisotropic redox behaviors and offers a fast, reliable, and simplified method to probe the facet-specific redox and catalytically active surfaces electrochemically.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2025
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IF 3.7
Jun Shen,Changhui Liang,Yuxin Zhang,Xiaoqiang Zhang,Huixiang Li,Yongxin Li,Songhai Xie,Z. Conrad Zhang
Bioethanol and furanics are currently prevailing additives to fossil-based transportation fuels. With the objective to lift the longstanding limitations of these biofuel additives, this work reports for the first time the synthesis of 2-ethoxy-2-methyltetrahydrofuran (2-EO-2-MTHF) as a co-upgraded fuel by reacting ethanol with 2-methylfuran (2-MF). The formation of 2-EO-2-MTHF is achieved through ethanol ethoxylation of 2-MF, enabled by a reverse Ni(OH) x /Ni catalyst under hydrogen pressure. Nickel hydroxide species over the Ni nanoparticles play a crucial role in activating ethanol and polarizing the partially hydrogenated dihydrofuran intermediates, favorably steering the reaction selectively toward the ethoxylation product. The reaction conditions, including pressure and temperature, are systematically optimized to enhance the yield of 2-EO-2-MTHF, and provide a means to beneficially tune the fuel compositions consisting mainly of 2-EO-2-MTHF and 2-MTHF, both are high energy density molecules. Importantly, the reverse Ni(OH) x -Ni catalyst allows a one-pot process to accomplish consecutive partial hydrogenation of 2-MF and ethanol ethoxylation. This work provides a practical strategy for upgrading biomass-derived polar primary fuel molecules into more versatile fuels and chemicals.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Zufeng Qiu,Kexin Yang,Zijian Huang,Hongsheng Zhao,Zhiwei Lin,Qin Kuang,Zhaoxiong Xie
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has emerged as a superior technique for detecting small molecules, owing to the strategic utilization of inorganic nanomaterial matrices. Despite the impressive capabilities of various novel matrices, the underlying interaction mechanisms between inorganic matrices and analytes remain largely unexplored. In this study, we synthesized Co 3 O 4 nanocubes, Co(OH) 2 nanosheets, Co 3 O 4 /Co(OH) 2 heterojunctions, and Co 3 O 4 +Co(OH) 2 composites via a facile one-pot method. Amino acids were selected as model analytes for performance evaluation. Notably, the Co 3 O 4 /Co(OH) 2 heterojunctions significantly enhanced signal intensity and lowered detection limits to the parts-per-billion (ppb) level, outperforming Co 3 O 4 nanocubes, Co(OH) 2 nanosheets, and Co 3 O 4 +Co(OH) 2 composites. The detection results for environmental pollutants, especially in solutions containing real samples, highlight the outstanding performance of the heterojunction material as a matrix. Further characterization indicates that the formation of the heterojunction enhances nanoparticle dispersion and promotes the separation of photogenerated electron-hole pairs. Consequently, more photogenerated charge carriers can be transferred to the target analytes, facilitating their charging ability and ultimately enhancing signal intensity in MALDI-TOF MS. These results clearly demonstrate that the enhanced photocatalytic performance directly drives the improvement of MALDI-TOF MS performance, excluding interference from other factors. Thus, this study successfully combines photocatalytic mechanisms with MALDI-TOF MS mechanisms, providing new insights into the enhancement of MALDI-TOF MS performance. Additionally, it offers a new detection method for environmental pollutants.
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ACS Omega
·
2020
·
IF 2.87
Chunmei Xiao,Jianming Lin
The contamination of water systems by heavy metals greatly threatens human health and ecological safety. An efficient adsorbent is critical for the removal of these contaminants. In this work, magnetic Ni3Si2O5(OH)4 nanotubes (NTs) have been synthesized via in situ hydrothermal reduction and further functionalized by grafting poly(4-vinyl pyridine) (P4VP) brushes on its surface via atom transfer radical polymerization. Characterizations by Fourier transform infrared, X-ray diffraction, thermogravimetric analysis, transmission electron microscopy, and X-ray photoelectron spectroscopy proved that P4VP was successfully grafted on the surface of magnetic Ni3Si2O5(OH)4 NTs. The resultant Ni3Si2O5(OH)4-g-P4VP NTs are efficient nanosorbents for removing Cr(VI) anions from water. The Cr(VI) adsorption capacity of Ni3Si2O5(OH)4-g-P4VP NTs reaches 1.49 mmol/g at a pH of 3. The pseudo-second-order kinetic model and the Freundlich isothermal model are suitable to describe the adsorption process. The analysis using Weber–Morris and Boyd models indicates that both intraparticle diffusion and external film diffusion affect the Cr(VI) adsorption process. The adsorption enthalpy is estimated to be 18.37 kJ/mol. More than 90% of the Cr(VI) adsorption capacity of the Ni3Si2O5(OH)4-g-P4VP NTs remains after eight adsorption and desorption cycles.
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Small
·
2024
·
IF 13
Hongbo Zhang,Yiting Zhao,Zhenfeng Cheng,Jingyun Jiang,Jianwei Fu,Qun Xu
To meet the industrial demand for overall water splitting, oxygen evolution reaction (OER) electrocatalysts with low-cost, highly effective, and durable properties are urgently required. Herein, a facile confined strategy is utilized to construct 2D NiFe 2 O 4 /Ni(OH) 2 heterostructures-based self-supporting electrode with surface-interfacial coengineering, in which abundant and ultrastable interfaces are developed. Under the high molar ratio of Ni/Fe, both spinel oxide and hydroxides phases are formed simultaneously to obtain 2D NiFe 2 O 4 /Ni(OH) 2 heterostructure. The in-depth analysis indicates that the NiFe 2 O 4 /Ni(OH) 2 interface displays strong electronic interactions and triggers the formation of crystalline-amorphous coexisting catalytic active NiOOH. Meanwhile, the stable catalyst-collector interface favors the electron transfer and oxygen molecules transport. The resultant 2D NiFe 2 O 4 /Ni(OH) 2 @CP electrode exhibits superior OER performance, including a low overpotential of 389 mV and a long operating time of 12 h at 1 A cm −2 . This work paves a novel method for fabricating efficient and low-cost electrocatalysts for electrochemical conversation devices.
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