INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Kanagaraj Rajalakshmi,Selvaraj Muthusamy,Palanisamy Kannan,Kang-Bong Lee,Jimin Xie,Yuanguo Xu
In this study, we develop selenium (Se)-iron hydroxide (NiF–Se@Fe(OH) 2 ) hetero-nanostructured catalyst system for fuel cell, and environmental-relevant urea-electro-oxidation reaction. For the rational engineering, the Se layers are initially deposited on the Ni foam substrate; then we grow Fe(OH) 2 hetero-nanostructures with various morphologies by introducing different ratios of Fe precursor sample. The Fe(OH) 2 ball-like nanorods to rock-like nanosheets are synthesized on the Se layered Ni foam surface by a simple hydrothermal process. The microscopic characterizations, and spectral analysis reveal the formation of Se integrated Fe(OH) 2 hetero-nanostructures such as ball-like nanorods, sprouts-like nanowire network, nanoflowers and rock-like nanosheets through effective Ni–O bond and Fe–Se bond for its typical synergism. The Se induces an interesting morphology transformation from crystalline nanorods to rock-like nanosheets structures that lead to the potential constituents for catalyst electrode that effectively merge the qualities such as high conductivity, large specific surface area, and larger catalytic active sites for electro-oxidation reaction of urea. Among them, NiF–Se@Fe(OH) 2 (8 mmol Fe(NO 3 ) 2 ) sprouts-like hetero-nanostructured network displays higher catalytic activity toward oxidation of urea (146.7 mA) with onset potential of 0.11 V vs. Ag/AgCl in 1 M NaOH + 0.1 M urea. Furthermore, the sprouts-like NiF–Se@Fe(OH) 2 nanowired network shows superior activity than the other aspect ratio's, excellent long-term stability, and reproducibility.
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CHEMOSPHERE
·
2022
·
IF 8.943
Junsuo Li,Xinying Li,Shoucheng Ma,Wei Zhao,Wenming Xie,Jianqing Ma,Yijun Yao,Wei Wei
Microplastics (MPs) can act as vectors for various contaminants in the aquatic environment. Although some research has investigated the adsorption characteristics and influencing factors of metals/organic molecules on MPs, the effects of dissolved organic matter (DOM) (which are ubiquitous active species in ecosystems) on metal oxyanions such as Cr(VI) capture by MPs are largely unknown. This study explored the adsorption behaviors and mechanisms of Cr(VI) oxyanions onto polystyrene (PS) MPs using batch adsorption experiments and multiple spectroscopic methods. The effects of representative DOM components (i.e., humic acid (HA), fulvic acid (FA) and tannic acid (TA)) on Cr(VI) capture by PS were particularly studied. Results revealed a significantly enhanced adsorption of Cr(VI) on PS in the presence of TA. The Cr(VI) adsorption capacity was increased from 2876 μg g −1 to 4259 μg g −1 and 5135 μg g −1 when the TA concentrations raised from 0 to 10 and 20 mg L −1 , respectively. Combined microscopic and spectroscopic investigations revealed that Cr(VI) was reduced to Cr(III) by TA and formed stable Cr(OH) 3 colloids on PS surfaces. Contrarily, HA and FA inhibited Cr(VI) adsorption onto PS, especially at pH > 2.0 and higher DOM concentrations, due to site competition and electrostatic repulsion. Increase in pH was found to reduce zeta potentials of MPs, resulting in inhibited Cr(VI) adsorption. The adsorbed Cr(VI) declined with increasing ionic strength, implying that outer-sphere surface complexation affected the adsorption process in the presence of DOM. These new findings improved our fundamental understanding of the fate of Cr(VI) and MPs in DOM-rich environmental matrices.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Shen-Gen Gong,Yan-Hong Shi,Yang Su,Yan-Fei Li,Lei Ding,Jian Lin,Guo-Duo Yang,Bing Li,Xing-Long Wu,Jing-Ping Zhang,Hai-Ming Xie,Hai-Zhu Sun
Flexible asymmetric supercapacitor (FASC) systems are expected to exhibit not only excellent energy storage properties and safety but also satisfactory flexibility and robust integration. However, tremendous issues such as low capacitance, narrow voltage window, and poor mechanical properties still exist. In this paper, a novel kind of 3D lamellar Mn(OH)2 nanosheets on Cu-plated carbon cloth with a core-shell integrated framework (CPCC@CuO@Mn(OH)2) is fabricated to obtain the flexible material in the FASC. In this unique CPCC@CuO@Mn(OH)2 electrode material, the high theoretical specific capacity of CuO and Mn(OH)2 brings superior energy storage properties. Meanwhile, as the shell part, the deposited Mn(OH)2 layer and coated CuO layer work as both capacity contributors and substrate protectors, simultaneously maintaining the high capacitance and satisfactory flexibility of the electrodes. Therefore, the capacitance successfully achieves around 8140 mF cm–2 under 0.5 mA cm–2. Significantly, the assembled FASC (named as CPCC@CuO@Mn(OH)2//CC@AC) achieves a working voltage of up to 2.4 V. In the case of a high-power density close to 34.31 mW cm–3, its energy density reaches around 6.29 mW h cm–3. Moreover, the capacity holds 88.9% even after 10,000 cycles, showing its great application potential in the field of wearable electronics.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lifen Wang,Yonggang Liu,Yinjun Lin,Yonghao Yu,Xueying Zhang,Ruiqin Zhang,Yunpu Zhai
In this study, an effective Ni-doped Cu 2 (OH) 3 F was synthesized by a simple one-step hydrothermal method to activate H 2 O 2 for degrading organic pollutants in water. The prepared (Cu 2−x Ni x ) 2 (OH) 3 F showed significant degradation performance for the degradation of RhB and TC. The characterization methods of XRD, XPS , TEM , SEM, FT-IR proved that Ni successfully replaced part of the Cu in Cu 2 (OH) 3 F site and provided more active sites for decomposition of H 2 O 2 through the synergistic effect of the bimetal . Besides, the photochemical properties of the prepared catalysts were analyzed by UV–vis, electrochemical impedance spectroscopy and transient photocurrent, which confirmed that the introduction of Ni narrowed the band gap of (Cu 2−x Ni x ) 2 (OH) 3 F and accelerated the separation of photogenerated electrons and hole pairs. Free radical capture experiments showed that •OH, h + , and •O 2 - all contributed to the reaction, and •OH was the main active substance. This research provides a photo-Fenton-like catalyst with simple synthesis, high performance and stable properties for future sewage treatment.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 34
·11775-11782
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IF 4.39
Lei Ye,Yeqing Zhang,Meilin Zhang,Yaqiong Gong
To overcome the problem of the sluggish kinetics of the oxygen evolution reaction (OER), it is of great significance to develop an efficient and stable non-noble metal-based OER catalyst for electrocatalytic energy conversion and storage. Herein, a complex of a metal–organic framework and hydroxide is synthesized by performing a ligand etching strategy on FeMn co-doped Ni(OH)2 nanosheets in situ grown on nickel foam (FeMn-Ni(OH)2@MOF/NF). Benefiting from the unique sheet-on-sheet hierarchical structure, multi-metal active nodes and two active materials grown in situ, the resulting FeMn-Ni(OH)2@MOF/NF demonstrated brilliant OER activity with an overpotential of 199 mV to achieve a current density of 10 mA cm−2 and long-term stability. This research will provide a new strategy for the design of high-performance OER electrocatalysts.
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高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Zhiguo Lin,Jing Chen
In order to facilitate recovery and enhance phosphate adsorption capacity of lanthanum (La)-based materials, magnetic Fe 3 O 4 @MgAl-LDH@La(OH) 3 (MMAL) composites with a hierarchical core-shell structure were synthesized. In the preparation process, citric acid played a vital role in the morphology control of La(OH) 3 , deciding the La content and phosphate adsorption capacity of materials. MMAL composites with a citric acid-to-La molar ratio of 0.375 (MMAL-0.375) exhibited a high adsorption capacity of 66.5 mg P/g, fast adsorption kinetics of 30 min, widely applicable pH range of 4.0–10.0, outstanding selective adsorption performance, and superior reusability in batch adsorption experiments. Moreover, the phosphate in the desorption solution could be concentrated by repeated use of desorption solution and recovered by using CaCl 2 . When the obtained composites were used for the sedimentary phosphorus sequestration and recovery, the results showed that the addition of MMAL-0.375 effectively reduced the concentration of soluble reactive phosphorus (SRP) in the overlying water. Accompanied by an evident increase in HCl-extractable phosphorus (HCl–P), mobile phosphorus (P mob ) in sediments was effectively reduced. This work indicates that the MMAL-0.375 composites can serve as an effective tool for the removal of phosphate from wastewater and the control of sedimentary phosphorus.
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RSC Advances
·
2020
·Vol. 10
·期 11
·6405-6413
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IF 3.119
Leitao Zhang,Lilan Huang,Lei Zhang,Binzhong Lu,Junbo Li,Yingfang Xie,Qiang Ma,Qingping Xin,Hui Ye,Lizhi Zhao,Yuzhong Zhang,Hong Li
Delicate design of hierarchical nanoarchitectures has become a highly effective strategy to develop novel adsorbents with improved adsorption capacity. Herein, hectogram-scale green fabrication of hierarchical 4A zeolite@CuOx(OH)(2−2x) (0 ≤ x < 1) nanosheet assemblies core–shell nanoarchitectures (4A-Cu-T, T was the calcination temperature) with terrific Congo red (CR) dye adsorption performance was achieved through a simple, template-free and surfactant-free hydrothermal approach. A series of characterization techniques, including scanning electron microscopy, transmission electron microscopy, X-ray diffraction and photoelectron spectroscopy demonstrated that all resultant adsorbents featured a core–shell structure with 4A zeolite as core ingredients and CuOx(OH)(2−2x) (0 ≤ x < 1) nanosheet assemblies as shell components. The adsorption experimental results pointed out that 4A-Cu-300 with a maximum adsorption capacity of 512.987 mg g−1 showed the best adsorption performance amongst all as-prepared adsorbents, and the adsorption capacity of shell component-CuOxCu(OH)(2−2x) (0 ≤ x < 1) nanosheet assemblies was calculated up to 3685.500 mg g−1. The shell thickness and phase ratio of CuO and Cu(OH)2 in CuOx(OH)(2−2x) (0 ≤ x < 1) nanosheet assemblies played key roles in improving the adsorption capacity. The successive tests suggested that the “carbon deposition” resulted in the decreased adsorption capacity of first-regenerated adsorbents, but little variance in adsorption performance among regenerated samples demonstrated the good stability of such adsorbents. This work unlocks a method for the rational design of high-performance adsorbents via delicate decoration of poor-performance materials with nanosheet assemblies, which will endow the non-active materials with enhanced adsorption properties.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ren Xie,Shucheng Liu,Yongchao Rao,Abdou Karim,Xiaosi Qi,Haifu Huang,Haicheng Xuan
The requirements of the morphology and material properties in common make it possible to integrate the two functional electrodes, hydrogen electrocatalyst and supercapacitor , into one material system. The order of electrochemical performance of core materials was ranked as NiCoP > NiCo 2 S 4 > NiCo 2 O 4 . By constructing core/shell heterostructure, Ni-Co-X/Co(OH) 2 composites achieved the boost of electrochemical performance than individual Ni-Co-X. Particularly, the NiCoP/Co(OH) 2 composite synthesized under optimal conditions presented both excellent catalytic activity and charge storage capability. The NiCoP/Co(OH) 2 composite needed small overpotential of 73 mV to drive current density of 10 mA cm −2 in 1 M KOH, displayed Tafel slope of 75 mV dec −1 and long-term stability over 15 h without obvious fluctuation. Moreover, the NiCoP/Co(OH) 2 composite showed high specific capacitance of 1604 F g −1 at 1 A g −1 , delivered remarkable rate capability of 81.8 % at 20 A g −1 and cyclic stability with 91.8 % capacity retention over 5000 cycles. The impressive electrochemical properties of NiCoP/Co(OH) 2 composite is attributed to the enriched active sites, enhanced electronic conductivity and strong synergistic effect. Our research provides insights and effective strategies for the design and synthesis of integrated electrodes for hydrogen electrocatalysts and supercapacitors.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Chao Gao,Guijuan Wei,Chunyang Wang,Xiaofei Zhou,Xixia Zhao,Qian Zhao,Shoujuan Wang,Fangong Kong
To simultaneously accelerate both sluggish hydrogen evolution reaction (HER) and urea oxidation reaction (UOR) kinetics, strongly coupling of transition metal hydroxides of high UOR activity with the transition metals of low hydrogen adsorption barrier for highly active HER is a promising strategy. Herein, a tractable hydrothermal protocol and a partial in-situ topological reduction strategy are developed to synthesize hcp Ni/r-Ni(OH) 2 nanosheets containing abundant oxygen defects with an ultrathin carbon layer, which are utilized as the new bifunctional catalysts for both HER and UOR. As for HER, the surface electronic structure of Ni is optimized by introducing the oxygen defects coupling with hcp Ni with excellent electronic structure, which greatly enhances the dissociation ability of H 2 O and reduces the Ni-H bond strength , thus acquiring the optimized H* Gibbs free energy (∆G H *). As for UOR, abundant interfaces and the electron transfer between transition metal hydroxides/transition metal are favorable to regulate the urea adsorption. As expected, the hcp Ni/r-Ni(OH) 2 /C electrocatalyst shows good activity for HER (70.7 mV @ 10 mA cm −2 ), UOR (1.36 V @ 10 mA cm −2 ), and urea electrolysis (1.45 V @ 10 mA cm −2 ). This facile strategy provides a novel way to design high-performance electrocatalysts towards urea splitting, which can utilize to generate hydrogen as well as eliminate urea in water.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Tao-Long Wu,Xiu-Niang Tan,Tian-Tian Nong,Yu-Jie Pan,Peng-Fei Qiu,Jia-Qi He,Yan Zhou,Xue-Cai Tan,Zai-Yin Huang,Lei Han
Owing to the high specific surface area, rich active sites, well-controlled morphology and structural stability with tunable compositional components, the rational combination of hybrid nanostructured materials from metal-organic frameworks templates has become highly attractive and still of great challenge for supercapacitors. In this work, three bimetallic metal–organic frameworks Co 1-x Fe x -MOF-74/NF ( x = 0.25, 0.5 and 0.75 ) nanoarrays with different proportional Co/Fe ratios on nickel foam have been successfully designed and fabricated via in-situ interfacial growth method, which were further controllable converted to α-Co(OH) 2 /CoFe 2 O 4 nanoarrays with different proportional Co/Fe ratios CF-x/NF ( x = 0.25, 0.5 and 0.75 ) without structure collapse through alkaline etching process. Among them, the transformation of the bamboo-shoot-like CF-0.75/NF electrode displays excellent electrochemical properties with high area capacitance (3941.14 mF/cm 2 at 2 mA/cm 2 ), good rate capability, low resistances and remarkable cycling stability. The CF-0.75//AC ASC device delivers a high energy density of 0.16 mWh/cm 2 at a power density of 0.756.1 mW/cm 2 . And this CF-0.75//AC ASC device exhibits a good cycling stability and practical application in energy storage field. This strategy could be extend to form other unique bimetallic hybrids nanoarrays architectures with enhanced electrochemical activity for high-performance energy storage devices.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Cui Li,Zhaotian Ba,Bingchen Wu,Xinxin Shi,Hui Liu,Lili Ma,Xin Wen,Pingan Song
The design of environmentally friendly flame retardants to achieve the balanced flame retardancy and mechanical properties of poly(L-lactic acid) (PLA) is a critical challenge. Herein, inspired by the micropapillae adorned with hydrophobic wax crystals structure of lotus leaf, Mg(OH) 2 /Co-MOF/DOPO hybrids (MH@MOF- g -DOPO) were successfully constructed through in-situ growth of Co-MOF and chemical grafting of DOPO. Thermogravimetric analysis (TGA) revealed that the Co-MOF content in MH@MOF was approximately 27.3 wt%, while the grafted DOPO in MH@MOF- g -DOPO was about 19.5 wt%. Owing to the unique microstructure, the water contact angle of MH@MOF- g -DOPO reached to 113.7°, implying its hydrophobic surface. Subsequently, the as-synthesized MH@MOF- g -DOPO was used to prepare PLA composites, which exhibited significantly improved flame retardancy, as indicated by the LOI value of 30.2 %, UL-94 V0 rating, and the reduction on PHRR by 70.1 %. The flame retardant mechanism was attributed to the synergistic effects of multiple flame retardant units (MH, Co-MOF and P) in MH@MOF- g -DOPO hybrids. Furthermore, the flame retarded PLA/20MH@MOF- g -DOPO achieved the brittle-tough transformation via uniaxial pre-stretch process, thus displayed outstanding mechanical properties (good stiffness and excellent toughness). Notably, compared to the pristine undraw PLA, the Youngꞌs modulus, tensile strength and the elongation at break PLA/20MH@MOF- g -DOPO increased by 35 %, 38 % and 1957 %, respectively. This work proposes an innovative and efficient method to achieve the excellent balance on flame retardancy and mechanical properties of PLA composites, benefiting to promoting their real-world applications as functional polymer materials.
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JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 9
·3764-3769
·
IF 5.968
Xiao-lei Huang,Xue Zhao,Zhong-li Wang,Li-min Wang,Xin-bo Zhang
Hybrids of Co(OH)2 nanosheets (NSs) and Co3O4 nanoparticles (NPs) are synthesized by a facile hydrothermal strategy, wherein the Co(OH)2 NSs form a flower-like structure and the Co3O4 NPs are embedded on the interlayer surfaces of the Co(OH)2 NSs. The morphology, microstructure and composition of the hybrid can be tuned by the reaction time. When tested as anode materials for lithium-ion batteries, these ordered hybrid nanostructures of Co(OH)2 NSs/Co3O4 NPs manifest significantly enhanced Li storage properties, including a high reversible capacity, long cycle life, and superior rate performance. The obtained promising performance could be attributed to the unique microstructure and the synergistic effect of the corresponding chemical composition in the nanocomposite.
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危险品化学品经营许可证（带存储）