NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 26
·11336-11341
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IF 3.288
Dongying Shi,Chao-Jie Cui,Chun-Xiao Sun,Jun-Ping Du,Chun-Sen Liu
A new [Co21(H2O)4(OH)12]30+ unit-incorporating polyoxotungstate, Na18[Co(H2O)6]2{[Na(H2O)4]2[Na(H2O)2]2[Co(H2O)3]2[Co21(H2O)4(OH)12](SiW10O37)6}·24H2O (denoted as Co25Si6W60), has been hydrothermally synthesized and fully characterized via elemental analyses, thermogravimetric analysis, bond valence sum (BVS) calculations, IR spectrum, UV-vis spectrum, diffuse reflectance spectrum, powder X-ray diffraction and single-crystal structural analysis. The most remarkable feature is that the gigantic [Co21(H2O)4(OH)12(SiW10O37)6]30− core in Co25Si6W60 is composed of a square-like [Co21(H2O)4(OH)12]30+ nanosheet encapsulated by six dilacunary Keggin [α-SiW10O37]10− moieties in a staggered fashion, resulting in a remarkable sandwich-type assembly. Furthermore, the unique Co25Si6W60-based biosensing system, as a simple, rapid, and highly sensitive electrochemical platform, offers an environmentally friendly route for detecting dichlorvos in the field of both food safety and environmental pollution.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 6
·066515
·
IF 3.721
Wenjing Liu,Zhiyuan Wu,Pei Dong,Feifei Lin,Meng Zang,Shuai Qiao,Yingying Gu,Jinqiang Zhang,Shuaijun Wang,Chaocheng Zhao
Developing effective and economical materials for emerging electrochemical remediation of persistent organic pollutants has attracted significant research interest. In this study, a heteromorphic self-standing nickel foam@Ni(OH)2/MnO2 (NF@Ni(OH)2/MnO2) electrode was synthesized by a simple solvothermal method and employed for the remediation of persistent organic pollutants. The prepared NF@Ni(OH)2/MnO2 electrode exhibited better performance for the electro-catalytic degradation of tetracycline (TC) than that of the NF and NF@Ni(OH)2. In optimized conditions, the NF@Ni(OH)2/MnO2 electrode exhibited the highest TC degradation efficiency (90%) and total organic carbon(TOC) removal (59.02%) among the prepared electrodes. In addition, a higher mineralization current efficiency (MCE) and lower energy consumption (EC) for the NF@Ni(OH)2/MnO2 electrode was achieved. The enhancement occurs primarily because the active MnO2 anchored to the porous and highly conductive Ni foam substrate surface boosts the electron transfer and the generation of hydroxyl radicals, as proved by a free radical trapping experiment and fluorescence spectrum analysis. This study suggests the possibility of a new paradigm in designing effective and practical electro-Fenton electrodes for environmental remediation.
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Small
·
2021
·Vol. 17
·期 33
·2102097
·
IF 13.281
Chunqiao Jin,Pengbo Zhai,Yi Wei,Qian Chen,Xingguo Wang,Weiwei Yang,Jing Xiao,Qianqian He,Qingyun Liu,Yongji Gong
Ultrathin nickel (Ni)-based sulfide nanosheets have been reported as excellent electrocatalysts for overall water splitting; however, the uncontrollability over thickness due to the nonlayered structure still hampers its practical application. Herein, a simple topochemical conversion strategy is employed to synthesize cobalt-doped Ni 3 S 2 (Co-Ni 3 S 2 ) ultrathin nanosheets on Ni foam. The Co-Ni 3 S 2 nanosheets are controlled synthesized by using Co-Ni(OH) 2 ultrathin nanosheets as templates with anneal and sulfurization treatment, showing exceptional electrocatalytic activity. This template-assisted method can also be applied to obtain Ni, NiO, and NiP x nanosheets, providing a universal strategy to synthesize ultrathin nanosheets of nonlayered materials. The overall water splitting of this Co-Ni 3 S 2 ultrathin nanosheets achieves a low voltage of 1.54 V at a current density of 10 mA cm −2 and high durability in 1 m KOH, comparable to the best performance of electrochemical water splitting ever reported. The detailed structural transformation of Ni-based sulfides in the catalytic process and its mechanism are further explored both experimentally and theoretically.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Wenhao Zhang,Yuanhao Tang,Liangmin Yu,Xin-Yao Yu
Nickel-based metal oxides/hydroxides are promising electrocatalysts for oxygen evolution reaction. However, their electrocatalytic activity for hydrogen evolution reaction (HER) is very poor. Herein, taking Mo-incorporated nickel hydroxide (Mo-Ni(OH) 2 ) as an example, a facile, time-efficient, and low-temperature H 2 /N 2 plasma activation strategy is developed to activate the HER performance by constructing heterostructure. This kind of heterostructure is composed of metal, metal alloy, metal nitride , and oxygen vacancy-riched metal hydroxide with more exposed catalytically active sites, enhanced mass activity, and accelerated electron transport. The optimized plasma-activated Mo-Ni(OH) 2 (P-Mo-Ni(OH) 2 ) manifests superior HER performance to pristine Mo-Ni(OH) 2 and even comparable to the benchmark Pt/C catalyst in alkaline solution. Moreover, when assembling a two-electrode urea-assisted water electrolysis system by using P-Mo-Ni(OH) 2 as both cathode and anode, the assembled cell only need a small voltage of 1.36 V to achieve a current density of 10 mA cm −2 and exhibits extremely stable catalytic performance up to 1000 h.
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Frontiers in Chemistry
·
2020
·
IF 3.693
Zhou Xinfeng,Qi Weihong,Yin Kai,Zhang Ning,Gong Shen,Li Zhou,Li Yejun
Highly efficient and low-cost non-noble metal based electrocatalysts for oxygen evolution reaction (OER) have attracted more and more attention in recent years. However, the current research has been focused on the construction of novel OER electrocatalysts themselves, little attention has been paid to the modification of the substrates. In this work, a different strategy is proposed via laser ablation to fabricate the Cu foams with rich micro/nano-structures as OER substrates. Later, the precipitation conversion method was utilized to grow cobalt hydroxide on the laser fabricated Cu foams. The as-produced Cu/Cu oxides/Co(OH)2 electrocatalysts exhibit high OER activity in 1 M KOH, requiring an overpotential of only 259 mV at a current density of 50 mA cm−2 with excellent mild-term durability. The improved catalytic performance of the prepared samples can be attributed to the increased surface area, rich active sites, and the superhydrophilicity of the laser produced micro/nano-structures.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 31
·期 2
·338-349
·
IF 2.162
Lei Yang,He-qing Fu
Based on the strong adsorption of the diphosphate group to Fe and Al ions, first, the Fe 3 O 4 and Al (OH) 3 nanoparticles were modified by alendronate sodium (ALN), and organic phosphorus coated nanoparticles (Fe 3 O 4 -ALN and Al (OH) 3 -ALN) with the active group ─NH 2 were prepared. Novel [ x Fe 3 O 4 –2 x Al(OH) 3 ]/waterborne polyurethane nanocomposite with superparamagnetism and excellent flame retardancy were prepared by in situ polymerization. The experimental results showed that when the content of Fe 3 O 4 -ALN increased, the M s increased. And the saturation magnetization reached 14.35 emu/g when the Fe 3 O 4 -ALN content was 10 wt%. The nanoparticle network formed by Fe 3 O 4 and Al (OH) 3 can prevent the melting deformation of waterborne polyurethane (WPU) composite film and reduce the burning area. And the dual physical protective layer formed by nanoparticle network and char layer can prevent the combustible gas contacting with oxygen and giving off combustion heat, which effectively reduced the heat and smoke gas release. When the content of x Fe 3 O 4 –2 x Al(OH) 3 was 20 wt%, the oxygen index of the composite was 28.4%, and the flame retardancy of nanocomposite was classified as V-0 rating in the UL-94 test.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wenxiu He,Hengrui Qiu,Jing Meng,Bin Liu,Jinlong Cui,Yongqiang Zhang
A nanoscale petal-like α-Ni(OH) 2 /reduced graphene oxide (α-Ni(OH) 2 /RGO) composite was synthesized with the one-step microwave method. α-Ni(OH) 2 particles with sizes of approximately 200 nm are uniformly distributed on the reduced graphene oxide sheet in the sample. When used as an electrode for alkaline rechargeable batteries, the discharge capacity of the α-Ni(OH) 2 /RGO composite reaches 333.5 mAh/g at 0.2C and 247.1 mAh/g at 10 C, respectively, with an excellent rate capability. After 2000 cycles, the capacity of the electrode is insignificantly attenuated, indicating a high capacity retention and cycling stability. The outstanding electrochemical properties are attributed to the nanoscale petal-like structure α-Ni(OH) 2 anchoring on the RGO sheets, which facilitates ion diffusion and increases the active surface, which is effectively reacting with the electrolyte. The nanoscale petal-like electrode material fabricated in this study provides clues to address the problem of energy applications of high-performance alkaline rechargeable batteries.
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WATER ENVIRONMENT RESEARCH
·
2019
·Vol. 91
·期 8
·770-779
·
IF 1.24
Jinhong Fan,Hehe Qin,Yunfei Zhang,Simin Jiang
In this study, Fe/Cu bimetal composite was prepared by high-energy ball milling (BM) method for the removal of refractory organics. The BM Fe/Cu bimetal was characterized by SEM-EDS, XRD, and XPS. Evenly distributed Fe and Cu was observed in the EDS mapping. In contrasting experiments, the removal rate of 4-chlorophenol (4-CP) by BM Fe/Cu materials was about 10-fold faster than that by chemical substitution deposition (CSD) of Fe/Cu material. Complete 4-CP removal and 66.7% of total organic carbon (TOC) mineralization in the BM Fe/Cu–O 2 system were achieved. Dissolved oxygen plays a crucial role for 4-CP degradation through the in situ generation of reactive oxygen species (ROS) such as H 2 O 2 , ·OH, and via oxygen activation reactions. The predominant reactive radicals were identified to be and ·OH through ESR technique and inhibition experiments. The coexistence of oxidation and reduction of 4-CP in the BM Fe/Cu-O 2 system was proposed. Practitioner points 4-CP removal rate by BM Fe/Cu is 10-fold faster than that by CSD Fe/Cu at the same conditions. Complete 4-CP removal and 66.7% of TOC reduction were achieved. All three ROS including ·OH, , and H 2 O 2 coexisted in the BM Fe/Cu-O 2 system. A harmonious coexistence of oxidation and reduction mechanism was proposed.
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MATERIALS TECHNOLOGY
·
2019
·
IF 1.82
Xinyu Jiang,Wenbo Cheng,Huijie Hu,Yiming Hu,Yunpeng Cao,Shengnan Yan,Ruixin Di,Xiaoze Wang,Li Hou
As an excellent electrode material for supercapacitors, it should have high capacitance like transition metal oxides and good stability like carbon materials. In this work, we reported a novel composite electrode material, Co-Ni(OH)2/carbon sphere, obtained by a solvothermal method. At first, the activated carbon spheres with an uniform size of about 4µm were synthesized, and then the sheet-like Co-Ni(OH)2 adsorbed on the cracks and outer surface of the carbon spheres to form the Co-Ni(OH)2/carbon sphere composite. The influence of mass ratio of Co-Ni(OH)2 to carbon spheres on capacitance performance was investigated. Benefitting from the unique composite structure, the synthesized Co-Ni(OH)2/carbon sphere presents a high specific capacitance up to 959.7 F/g in 6 M KOH at current density of 1 A/g. Meanwhile, the capacitance retention maintains its 75% after 3000 cycles, which is about 2.8 times higher than that of the pure Co-Ni(OH)2, indicating a good stability.
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Micro & Nano Letters
·
2019
·Vol. 14
·期 7
·749-752
·
IF 0.975
Li Hong Qian,Xiao Cai Liang,Hua lan Zhou
The Ni(OH) 2 /NiOOH nanoparticles (NPs) electrodeposited on a glassy carbon electrode (GCE) in Ni(NO 3 ) 2 and NH 3 ·H 2 O aqueous solution for the electrode materials. Then the nickel hydroxide/oxyhydroxide acetate was formed in acetate solution. The effects of deposition conditions such as the concentration of Ni(NO 3 ) 2 solution, the number of sedimentary cycles, the concentration of acetate in the soaking liquid and the soaking time are discussed in detail. The electrochemical properties of the material have been investigated by cyclic voltammetry, Tafel curve, EIS and amperometric i–t curve techniques. The result displays excellent electrocatalytic activity towards the electrocatalytic oxidation of urea in alkaline solution. Furthermore, the modified electrode for oxidation reaction has the advantages of simple preparation, good electrochemical properties and stabilisation.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yan Xu,Linjie Xie,Di Li,Rong Yang,Deli Jiang,Min Chen
The exploration of earth-abundant and high-efficiency electrocatalysts for water oxidation is of great significance for sustainable energy conversion. Co–Mo-based bimetallic oxides are considered as promising candidates for the oxygen evolution reaction (OER) due to their high intrinsic activity and low cost. In this work, we reported an interfacial engineering design of CoMoO4 nanoplate arrays wrapped with Ni(OH)2 nanosheets supported on Ni foam for high-performance OER. Remarkably, benefiting from the hierarchical heterostructure arrays with strong interfacial interaction, enlarged surface areas, and more active sites, the optimized CoMoO4-Ni(OH)2 electrocatalyst manifests the excellent OER catalytic performance with a low overpotential of 349 mV at the current density of 100 mA cm–2, a long-term stability, and high (nearly 100%) Faradaic efficiency, which is superior to those of most previously reported Co–Mo-based bimetallic oxides electrocatalysts. Therefore, this interfacial engineering demonstrates an effective strategy for designing and fabricating high-performance electrocatalysts for OER reaction.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jing Li,Huilian Hao,Jianjun Wang,Wenyao Li,Wenzhong Shen
Nitrogen-enriched graphene coupled with nickel hydroxide nanosheets (Ni(OH) 2 /NG) hydrogel is successfully synthesized through a facile one-pot hydrothermal method . Comprehensive investigations reveal that the nitrogen atoms are successfully inserted into graphene and that the nickel hydroxide nanosheets (∼30–50 nm) are anchored on NG homogeneously. With the enhanced electroactivity caused by nitrogen doping and the synergy effect from Ni(OH) 2 nanosheets and NG, the Ni(OH) 2 /NG hydrogel electrode displays much better electrochemical properties than two individual electrodes. It features a specific capacitance as high as 896 F g −1 at 0.5 A g −1 and even 504 F g −1 at 12 A g −1 showing a high rate capability (56.3% retention with 24 times higher current density). An asymmetric supercapacitor device on the basic of Ni(OH) 2 /NG hydrogel and activated carbon (AC) was assembled and delivered a high energy density of 28.7 W h kg −1 at the power energy density of 0.36 kW kg −1 . Such results indicate that the Ni(OH) 2 /NG hydrogel could be considered as a promising candidate for electrochemical supercapacitors .
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