APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2021
·Vol. 127
·期 6
·1-10
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IF 2.584
Liu Yurong,Niu Shaoyu,Hu Rong
In this work, the ferric cobalt sulfide/aminated graphene quantum dots (FeCo 2 S 4 /NH 2 -GQDs) nanoflowers grown on Ni foam substrate have been successfully fabricated via a facile two-step hydrothermal method. The as-prepared FeCo 2 S 4 /NH 2 -GQDs nanoflowers can expose plenty of electroactive sites, provide fast charge transfer paths and buffer the drastic volume change during long-term charge–discharge cycles. Therefore, the FeCo 2 S 4 /NH 2 -GQDs nanoflowers exhibit excellent supercapacitive performance, including high specific capacitance, excellent rate capability and cycling stability. The specific capacitance of FeCo 2 S 4 /NH 2 -GQDs composite electrode reaches 2314.8 and 1802.5 F g −1 at the current density of 1 and 10 A g −1 , respectively, while maintaining superior cycling stability with 95.1% capacitance retention after 5000 cycles. This study proves that NH 2 -GQDs are promising materials to enhance the electrochemical performance of bimetallic sulfides, providing a new insight for the design and fabrication of novel electrode materials for high-performance supercapacitors.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Xiu-Ling Li,Wei Zhang,Yong-Qing Huang,Qiang Wang,Ji-Min Yang
Toxic azo dyes pose a significant threat to all living organisms when they are directly discharged into aqueous environments. Therefore, new adsorbents with excellent adsorptive efficiencies are urgently required for the removal of azo dyes. Herein, the adsorption space, surface charge, morphological and structural defects, and mesostructure of MIL-101(Cr) were adjusted by Ni(II) doping to understand the effects of these factors on the adsorptive removal of anionic azo dyes such as Congo red (CR), methyl orange (MO), and acid chrome blue K (AC) from aqueous solution. The adsorption uptakes of Ni(II)-doped MIL-101(Cr) toward CR (1607.4 mg g −1 ) and MO (651.2 mg g −1 ) exceeded those of undoped MIL-101(Cr) by 31.4% and 23.4%, respectively, whereas Ni(II) doping decreased the adsorption uptake toward AC (161.0 mg g −1 ) by 50.2%. Ni(II) doping produced morphological and structural defects, resulting in a new mesoporous structure, which played a more prominent role than electrostatic interactions and adsorption space in increasing the adsorption uptake toward linear anionic azo dyes, such as CR and MO. Despite these effects, for nonlinear azo dyes such as AC the adsorption uptake was decreased by steric hindrance between the Ni(II)-doped MIL-101(Cr) adsorbent and the dye. Thus, the adsorption performance of Ni(II)-doped MIL-101(Cr) was found to be controlled by the synergetic interplay among electrostatic interactions, π–π interactions, steric hindrance, and the morphological and structural defects, pore volume , and mesoporous structure of the adsorbent.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Chi Zhang,Zhuohong Xie,Yi Liang,Dingding Meng,Zheng Wang,Xin He,Weiye Qiu,Mei Chen,Ping Liang,Zhonghua Zhang
Ni(OH) 2 has been long studied as an effective oxygen evolution electrocatalyst . Nevertheless, its catalytic activity can still be further enhanced by microstructural modification and Fe-doping. In this study, with the assistance of adsorbent ferrihydrite (FH), we obtain Fe-doped β-Ni(OH) 2 nanoplates with Fe 2 O 3 nanoparticles decorated on the surface via a facile hydrothermal process. The Fe-doping, decorated Fe 2 O 3 nanoparticles , and special microstructure endow β-Ni(OH) 2 nanoplates with an improved oxygen evolution activity in alkaline solutions. For the sample with optimal FH amount, the overpotential to motivate a current density of 10 mA cm −2 is 280 mV, with a low Tafel slope of ~64.17 mV dec −1 . During the 10 h i-t test at 1.50 V vs. RHE , the current density has an attenuation of only 23.7%. The study opens a facile avenue to modify Ni(OH) 2 -based OER catalyst from perspectives of both microstructures and compositions .
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Nano Materials Science
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2021
·
IF 0
Ning You,Shuai Cao,Mengqiu Huang,Xiaoming Fan,Kun Shi,Haijian Huang,Zhangxian Chen,Zeheng Yang,Weixin Zhang
Improving catalytic activity and durabilty through the structural and compositional development of bifunctional electrocatalysts with low cost, high activity and stability is a challenging issue in electrochemical water splitting. Herein, we report the fabrication of heterostructured P-CoMoO 4 @NiCoP on a Ni foam substrate through interface engineering, by adjusting its composition and architecture. Benefitting from the tailored electronic structure and exposed active sites, the heterostructured P-CoMoO 4 @NiCoP/NF arrays can be coordinated to boost the overall water splitting. In addition, the superhydrophilic and superaerophobic properties of P-CoMoO 4 @NiCoP/NF make it conducive to water dissociation and bubble separation in the electrocatalytic process. The heterostructured P-CoMoO 4 @NiCoP/NF exhibits excellent bifunctional electrocatalysis activity with a low overpotential of 66 mV at 10 mA cm −2 for HER and 252 mV at 100 mA cm −2 for OER. Only 1.62 V potential is required to deliver 20 mA cm −2 in a two-electrode electrolysis system, providing a decent overall water splitting performance. The rational construction of the heterostructure makes it possible to regulate the electronic structures and active sites of the electrocatalysts to promote their catalytic activity.
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ELECTROCHIMICA ACTA
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2021
·
IF 6.901
Kun Song,Wenting Li,Rui Yang,Yongjie Zheng,Xiaoshuang Chen,Xin Wang,Guoli Chen,Weichao Lv
As a battery-type electrode material , Ni(OH) 2 has been widely concerned for its ultra-high theoretical specific capacity, however, its poor conductivity and lack of effective active sites hinder its application. It is a great challenge to develop Ni(OH) 2 based supercapacitors . It is critical to improve the electrical conductivity and effective active sites to make full use of the energy storage of Ni(OH) 2 -based materials. Therefore, Ni(OH) 2 /NiS composites are designed and prepared by controllable low temperature chemical deposition and ion exchange method. Ni(OH) 2 nanosheets with various morphology are controllably prepared by low temperature chemical deposition, and then Ni(OH) 2 /NiS composites are controllably prepared on Ni(OH) 2 substrate by ion exchange. Due to the doping of NiS into Ni(OH) 2 nanosheets, the conductive network structure is formed, which makes the composite exhibit excellent electrochemical properties, such as high specific capacity, large specific surface area and good electrical conductivity. The as-fabricated Ni(OH) 2 /NiS indicates an outstanding specific capacity of 240.5 mAh g −1 at 1 A g −1 . This paper detailed studies the practical application of hybrid supercapacitors , which may inspire future researchers to design Ni(OH) 2 -based materials with desired applications.
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Journal of Cleaner Production
·
2021
·
IF 9.297
Xiuling Guo,Yang Ruan,Zenghui Diao,Kaimin Shih,Minhua Su,Gang Song,Diyun Chen,Shuao Wang,Lingjun Kong
With the wide application of nuclear energy and the rapid development of mining, a great quantity of uranium (U(VI)) containing wastewater is inevitably generated. In this work, a facile environmental-friendly coprecipitation method was proposed for the green synthesis of binary layered double hydroxides (Ni–Co LDH W -7), which could be used to efficiently adsorb U(VI) from wastewater. Pseudo-second-order kinetic model and Dubinin-Radushkevich model fitted well with the adsorption of U(VI) on Ni–Co LDH W -7, the maximum adsorption capacity of U(VI) on Ni–Co LDH W -7 was 201.09 mg/g calculated by the Langmuir model. Adsorption equilibrium reached after 30 min, which is a spontaneous and endothermic process . Fourier Transform Infrared Spectrometer (FTIR) and X-ray Photoelectron Spectroscopy (XPS) measurements manifested that the favorable U(VI) extraction on Ni–Co LDH W -7 is mainly ascribed to inner-layer surface electrostatic interaction and complexation, which is dominated by abundant oxygen-containing M-OH and interlayer OH − ions. Briefly, this work provides a facial and environmental-friendly Ni–Co LDH W -7 for removing U(VI) in actual uranium-containing wastewater.
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Materials Advances
·
2021
·Vol. 2
·期 12
·3927-3939
·
IF 0
Ya-Fang Zhang,Ben Dai,Dan Zhao,Di-Hui Zhang,Meng-Xing Xu,Xiang-Hua He,Chao Chen
To span the inherent application limitation of state-of-the-art catalysts for the chemical transformation of biomass derivatives, here, we formulate a series of Pr–Ni–P catalysts for the hydrogenation transformation of biomass-derived levulinic-acid, furfural and maleic anhydride. With comprehensive characterizations, Pr–Ni–P samples are verified as (PrPO4)m/Ni2P nanocomposites with a molar ratio (m) in the range of 0.24–11.0. In comparison with the poor catalytic performance of Ni2P, a ten-fold enhancement in TOF up to 0.45 s−1 and at least five-time promotion on the yield of objective products up to 91–98% are achieved by introducing proper amounts of PrPO4 to form reusable (PrPO4)m/Ni2P nanocomposites. Surface chemistry and kinetic mechanism studies further disclose that the cooperative catalytic function of two components, in particular the exclusive capability of PrPO4 to activate hydrogen, is responsible for the promoted hydrogenation transformation of biomass derivatives via a quick Langmuir–Hinshelwood process over (PrPO4)m/Ni2P. These findings imply that an easily obtainable, cost-affordable and robust rare earth phosphate like present PrPO4 could be a potential replacement catalytic component for the traditional metal catalyst in the hydrogenation transformation reactions of biomass derivatives, which was also worth noting as a new kind of basic material for other green mass-transformation techniques involving hydrogen activation processes such as corresponding optical and electrical transformations.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Tao Zhang,Xiaoying Jin,Gary Owens,Zuliang Chen
Dye-contaminated wastewater resulting from rapid industrialization and urbanization is a global problem. In this study, a ZIF-8@Fe/Ni sample was synthesized for the removal of malachite green (MG), removing more than 99% of an initial MG concentration of 50 mg L −1 within 120 min with a 318 K adsorption capacity of 151.520 mg g −1 . To understand the dye removal mechanism based on adsorption and reduction, ZIF-8@Fe/Ni was characterized by various techniques. XRD showed that the ZIF-8@Fe/Ni composite had a characteristic peak attributable to Fe/Ni around 44.8°, where the presence of Fe/Ni did not affect the structure of ZIF-8. SEM confirmed that ZIF-8@Fe/Ni was successfully prepared, while XRD and FTIR revealed that the structure of ZIF-8@Fe/Ni remained stable following the introduction of Fe/Ni. XPS showed that while Fe/Ni nanoparticles existed in ZIF-8-Fe/Ni, partial oxidation also occurred. GC–MS demonstrated the creation of two major MG degradation products, (4-aminophenyl) (phenyl) methanone and 4-aminophenol. While the overall adsorption process of MG to ZIF-8@Fe/Ni conformed to pseudo-second-order kinetics, degradation followed pseudo-first-order reduction kinetics. When applied to the remediation of wastewater, ZIF-8@Fe/Ni removed 92% of MG. Overall, this study demonstrated that ZIF-8@Fe/Ni could be a promising material for the treatment of wastewater.
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PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 18
·10996-11003
·
IF 3.361
Mingxing Duan,Qingyan Cheng,Mingming Wang,Yanji Wang
A new noble metal-free Ni–Co–P/HAP (hydroxyapatite) amorphous alloy catalyst was synthesized by an impregnation-chemical reduction method; the structure and properties of the catalysts were characterized by XRD, SEM, BET, XPS and DSC. Based on the model of the hydrodeoxygenation (HDO) of vanillin to 2-methoxy-4-methylphenol (MMP) with formic acid as a hydrogen source, the catalytic performance of the catalyst was studied. The results found that the Ni–Co–P/HAP catalyst exhibited excellent catalytic activity for the in situ HDO reaction of vanillin compared with Ni–P and Ni–Co–P. The conversion of vanillin could be high to 97.86% with MMP selectivity of 93.97% under optimized reaction conditions. In addition, mechanism studies have shown that the side reaction of carbocation and vanillyl alcohol (HMP) condensation can be effectively reduced with increasing the hydrogenation rate, thereby the selectivity of MMP was effectively increased.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Changhai Liu,Lei Sun,Linlin Luo,Wenchang Wang,Huilong Dong,Zhidong Chen
Although nonprecious metal catalysts based on earth-abundant 3d transition metals (TMs) are regarded as promising substitutes for a noble metal electrocatalytic hydrogen evolution reaction (HER), their large-scale application is still inhibited by their inadequate activity and durability. Here, a facile method for nonprecious metal catalysts has been developed to prepare molybdenum carbide on nitrogen-doped carbon. By optimizing the Ni doping ratio, the Ni0.5@MoCx/NC exhibits the lowest overpotential for 10 mA cm–2 and superior stability in both acidic and alkaline media for HER application, outperforming most of the reported HER electrocatalysts. In addition, a theoretical simulation has also confirmed the possible mechanism for the synergistic effect with the regulative adsorption energy of hydrogen species with Ni doping and formation of a Mo2C/MoC heterojunction in the Ni0.5@MoCx/NC electrocatalyst. Therefore, this work provides a new avenue for designing two-dimensional nanostructures with an optimized electronic structure for promising TM HER electrocatalysts in a wide pH range.
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PubMed
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Huawei Zhu,Haifeng Yu,Zhaofeng Yang,Hao Jiang,Chunzhong Li
The Ni-ultrahigh cathode material is one of the best choices for further increasing energy–density of lithium-ion batteries (LIBs), but they generally suffer from the poor structure stability and rapid capacity fade. Herein, the tungsten and phosphate polyanion co-doped LiNi 0.9 Co 0.1 O 2 cathode materials are successfully fabricated in terms of Li(Ni 0.9 Co 0.1 ) 1– x W x O 2–4 y (PO 4 ) y by the precursor modification and subsequent annealing. The higher bonding energy of W O (672 kJ∙mol −1 ) can extremely stabilize the lattice oxygen of Ni-rich oxides compared with Ni O (391.6 kJ∙mol −1 ) and Co O (368 kJ∙mol −1 ). Meanwhile, the stronger bonding of Ni (PO 4 3– ) vs. Ni O could fix Ni cations in the transition metal layer, and hence suppressing the Li/Ni disorder during the charge/discharge process. Therefore, the optimized Li(Ni 0.9 Co 0.1 ) 0.99 W 0.01 O 1.96 (PO 4 ) 0.01 delivers a remarkably extended cycling life with 95.1% retention of its initial capacity of 207.4 mA∙h∙g −1 at 0.2 C after 200 cycles. Meantime, the heteroatoms doping does not sacrifice the specific capacity even at different rates.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Xianwen Zhang,Ping Li,Bin Xu,Jingxia Wang,Guangyin Fan,Xiaobin Zhang,Xiaoqiang Liu,Kaiming Zhang,Weidong Jiang
Selective hydrogenation of halogenated nitrobenzenes (XNBs) to halogenated amines (XANs) is of great importance for practical applications. Non-noble metal-based catalysts have shown prominent advantages in price and reserves accompanying low activity and selectivity toward the hydrogenation of halogenated nitrobenzenes (XNBs) even under harsh conditions. In this work, inexpensive Ni–Co-based composites (NxCC) were prepared for in situ tandem hydrogenation of XNBs to XANs by using hydrogen released from ammonia borane (AB) hydrolysis under ambient pressure. The results show these NxCC samples exhibited superior catalytic performance against Co3O4 or NiO samples. A selected N0.2CC catalyst as the mainly screened one can quantitatively convert XNBs to XANs with unprecedented activity with 100% XAN conversion. This catalyst can completely convert m-chloronitrobenzene (m-CNB) to m-chloroaniline (m-CAN), suggesting N0.2CC efficiently suppresses the further dichlorination of m-CAN. Recycling test shows the N0.2CC possesses higher stability and recyclability. The N0.2CC catalyst was found to be a dual catalyst that synergistically catalyzes both the AB dehydrogenation (about 1735 mL min–1 g–1 of hydrogen generation rate) and the subsequent hydrogenation (almost 100% conversion) of XNBs. Notably, it is the first time that the rapid in situ hydrogen activation (IHA) which facilely arouses the efficient hydrogenation of adsorbed substrate on the surface of catalyst has been elaborated. From a unique perspective, distinctive and simple control experiments were innovatively designed for testifying the advantage of tandem hydrogenation in contrast with traditional hydrogenation. This work presents an efficient and environmental strategy to selectively produce XANs from XNBs using high-performance non-noble metal composites.
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