DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Shuanghui Zeng,Xue Wang,Yunqian Zhang,Jiaojing Shao,Zhao Ding,Jie Zhao
A free-standing 3D core/shell composite material CNTs@Co 9 S 8 on nickel mesh has been prepared by a simple two-step method. Carbon nanotubes (CNTs) grown vertically on the surface of nickel mesh by chemical vapor deposition (CVD) method act as conductive skeleton. Then Co 9 S 8 nanosheets uniformly aligned on the surface of the CNTs by solvothermal method are interconnected to form a honeycomb structure . Owing to the close contact of the CNTs@Co 9 S 8 hybrid with the nickel mesh and the hierarchical 3D porous structure , the prepared Ni@CNTs@Co 9 S 8 electrodes exhibit low resistance and excellent charge storage capability with a specific capacitance of 1305.4 F g −1 at 1 A g −1 . The composite delivers an excellent rate capability with 84.3 % capacitance retention at 10 A g −1 . An asymmetric supercapacitor composed of Ni@CNTs@Co 9 S 8 and nitrogen-doped carbon nanotubes (NCNTs) shows an energy density of 23.8 Wh kg −1 and a high power density of 8007.4 W kg −1 . The specific capacitance of the ASC device remained 87.31 % after 10,000 charge-discharge cycles and two tandem ASCs can power two red LED diodes for at least 7 min, suggesting the potential application of the obtained free-standing electrode for supercapacitors .
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 48
·18342-18353
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IF 4
Minghao Dou,Mengjie Yao,Kai Ding,Yuye Cheng,Hongyu Shao,Shenjie Li,Yanyan Chen
Heterostructures formed by combining semiconductor materials with different band structures can provide work functions, d-band positions and electronic properties different from bulk materials and are considered as an effective strategy to improve the catalytic activity through electronic modification. In this study, an efficient MoS2/Fe-Ni3S2/NF heterojunction material was prepared by a two-step hydrothermal method. With the help of flake Ni(OH)2 synthesized in the first step, growth sites were provided for flake Ni3S2. The electronic structure of Ni3S2 was optimized by Fe doping, while the construction of the MoS2/Fe-Ni3S2 heterostructure allowed the catalyst to expose more active sites. MoS2/Fe-Ni3S2/NF exhibited a small charge transfer resistance and excellent electrocatalytic performance. At a current density of 10 mA cm−2, only low overpotentials of 148 mV and 118 mV were required for the oxygen precipitation reaction (OER) and hydrogen precipitation reaction (HER), respectively. Notably, when MoS2/Fe-Ni3S2/NF is used as the anode and cathode for overall hydrolysis, only 1.51 V is required to reach a current density of 10 mA cm−2, demonstrating its great potential for application in hydrolysis. This work provides a feasible idea for the rational construction of non-precious metal bifunctional electrocatalysts with excellent performance.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 48
·22269-22275
·
IF 3.3
Zilin Fan,Qimeng Ran,Xiaoling Xu,Yin Tang,Xiaobo Liu,Kun Jia
The design of organic precursors with optimized molecular structures is of great importance for improving the fluorescent properties and sensing applications of heteroatom-doped carbon nanodots (CDs). Herein, we designed and synthesized a phthalonitrile derivative containing both melamine and benzoxazine moieties, which has been, for the first time, employed as a cross-linkable precursor to prepare nitrogen-doped carbon nanodots (N-CDs), showing fluorescence emission with a large Stokes shift. As a result of the good affinity between the surface functional groups of N-CD and Ni ions proven by XPS and FTIR techniques, the fluorescence emission of optimized N-CDs can be selectively quenched by Ni ions among other metal ions. Furthermore, the synthesized N-CDs are employed as fluorescent probes for the quantitative detection of Ni ions with a wide concentration range and a high sensitivity (the limit of detection approaching 1.58 nM). Overall, the current work reveals a new possibility for expanding the synthesis route and metal ion sensing of nitrogen-doped CDs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yanlin Xu,Yacong Deng,Bin Liu,Zhuoyi Liu,Wenhong Wang,Yuan Pan,Bin Dong,Yichuan Li,Changlong Yin,Hailing Guo,Yongming Chai,Chenguang Liu
Due to the mass manufacturing of global papermaking black liquor, lignin remained in strong-alkaline black liquor is a promising raw material for bulk hydrocarbons production with huge carbon–neutral value. In this work, the alkaline in reactant is proved to inhibit the hydrodeoxygenation reaction of guaiacol severely due to the formation of phenates and cyclohexadienones. A hydroxyl interventional Ni/AC catalyst, on which an “acid-switch” is built with combination of hydroxyl groups and Ni nanoparticles, achieves 4-fold bio-hydrocarbons yield in alkaline condition compared to conventional Ni/AC catalyst. It is implied that hydroxy groups promote the C (sp2) -O reaction route with the aid of activated hydrogen on Ni nanoparticles, while acidic groups on catalyst reduce the size of Ni nanoparticles, thus further enhances the HDO efficiency. It is the first time we propose a reaction mechanism of HDO of guaiacol on Ni-based catalyst in alkaline condition to give insight into HDO reaction of lignin compounds in black liquor. This work gives insights into the relationship between catalyst surface properties and HDO efficiency, and provides a promising approach for green utilization of lignin in alkaline black liquor.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Qinglin Sheng,Duo Liu,Jianbin Zheng
In this paper, a sensitive novel non-enzymatic nitrite electrochemical sensor based on Pt nanoparticles loaded Ni(OH) 2 /Multi-Walled Carbon Nanotubes nanocomposites (Pt/Ni(OH) 2 /MWCNTs) was described. The composition and morphology of the Pt/Ni(OH) 2 /MWCNTs were characterized by transmission electron microscope and investigated energy dispersive X-ray spectra respectively. Results showed that the Pt nanoparticles could be anchored on the surface of the Ni(OH) 2 /MWCNTs uniformly through a simple reduction process. The electrochemical investigation of the sensor revealed that the Pt/Ni(OH) 2 /MWCNTs exhibited remarkable electrocatalytic performance toward nitrite oxidation , with a sensitivity of 145 μA mM − 1 cm − 2 and a low detection limit of 0.13 mM. Moreover, the obtained Pt/Ni(OH) 2 /MWCNTs modified GCE with excellent reproducibility and selectivity also allows for practical application. It is expected that the combination of noble metal with Ni(OH) 2 /MWCNTs could be expanded to enhance the catalytic performances of nanocomposites and used for the construction of high-sensitive electrochemical sensors.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Kefan Shi,Zemin Sun,Mengwei Yuan,Yuelin Zhao,Genban Sun
Because of their special features, NiFe-LDHs (nickel iron layered double hydroxides) are prospective OER (oxygen evolution reaction) catalysts that might be utilized to catalyse the electrolysis of water and produce hydrogen to address the energy crisis. In this work, the electronic structure and electrocatalytic performance of the NiFe-LDH were accurately regulated by optimizing the Ni sites, which was enabled by adjacent metal sites coordinated with the “polyoxometalate electron sponge”. With extension of the modification time, the Ni 2p binding energy, the Ni 3+ /Ni 2+ ratio and the OER properties were gradually tuned, which indicated accurate regulation of active Ni sites by the “polyoxometalate electron sponge” on a temporal scale. Additionally, NiFe-LDH-PW 12 -12 h (NiFe-LDH modified by polyoxometalate anions for 12 h) showed the highest OER performance along with fast electron transfer, superior reaction kinetics and electrochemical durability, with an overpotential ∼68 mV lower than that of NiFe-LDH. This work provides an accurate strategy for regulating the electronic structures of active metal sites for the OER.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zequn Zhang,Yuan Shu,Qian Liu,Shuxian Bi,Pengfei Zhang
Colloidal nanoparticles with uniform particle size distribution, tailored exposed facets, and controllable compositions appealed to broad interests in heterogeneous catalysis. Nevertheless, due to the strong attachment of capping agents to the nanoparticles, cleaning the nanoparticle surface without changing the size of nanoparticles remains a significant challenge. Herein, based on the double confinement of the strong metal-support interaction (SMSI) effect and carbon encapsulation, the well-stabilized Ni-ZnO-S3 catalyst was successfully synthesized. The size of Ni nanoparticles after calcination in the sequence of H 2 -N 2 mixture, air, and H 2 -N 2 mixture remained below 5 nm. Due to no significant size change in Ni nanoparticles, the prepared Ni-ZnO-S3 catalyst served well as model catalysts in the RWGS reaction, where the CO 2 conversion and CO yield increased proportionally to the Ni loading weight. According to the result of in-situ FTIR, an associative mechanism of RWGS reaction over Ni-ZnO-S3 was also identified. Therefore, this dual protect strategy provides a potential solution for building highly anti-sintering catalysts based on the colloidal synthesis route.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Xinyu Liu,Qianqian Fu,Zhichao Li,Hui Wang,Jianwei Ren
To address the growing demand for efficient and stable energy storage in the context of green energy, in this study, an acid etching method was employed to in-situ grow Ni(OH) 2 nanosheet arrays on a nickel foam (NF) substrate. Subsequently, negatively charged Ti 3 C 2 T x MXene nanosheets were electrophoretically deposited onto the Ni(OH) 2 /NF surface to result in a MXene/Ni(OH) 2 /NF composite electrode material. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations revealed the homogeneous dispersion distribution of nanosheets on the material surface. The composite material exhibited high electrical conductivity and good hydrophilicity by rapid water infiltration within 150 ms. Furthermore, the Motte-Schottky effect establishes a distinctive pathway for electron transfer , which leads to the creation of electron vacancies or ‘holes’ on the MXene surface. This phenomenon significantly boosts MXene's electrochemical activity and enhances its affinity for OH − ions in the electrolyte, which consequently improves the performance of electrochemical capacitors . Electrochemical tests verified that the prepared MXene/Ni(OH) 2 /NF electrode displayed an areal specific capacitance of 0.223 mAh cm −2 at a current density of 1 mA cm −2 . The electrode displayed excellent rate performance with a capacity retention rate of 71 % when the current density was increased by five times. In addition, the assembled asymmetric capacitor with MXene/Ni(OH) 2 /NF electrode demonstrated an excellent cycling stability with only a 16.38 % capacity loss after 5000 cycles. It also exhibited the remarkable specific capacitance and long-term stability by achieving a high energy density of 43.68 Wh kg −1 and a power density of 424.96 W kg −1 . These results highlight the electrode's exceptional performance in terms of energy storage and power delivery.
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高影响因子
Small
·
2023
·Vol. 20
·期 7
·2303300
·
IF 13.3
Chaoming Rao,Haijian Wang,Kai Chen,Haiyan Chen,Suqin Ci,Qiuhua Xu,Zhenhai Wen
Combining the methanol oxidation reaction (MOR) and hydrogen evolution reaction (HER) within an integrated electrolytic system may offer the advantages of enhanced kinetics of the anode, reduced energy consumption, and the production of high-purity hydrogen. Herein, it is reported the construction of Ni─MoN nanorod arrays supported on a nickel foam substrate (Ni─MoN/NF) as a bifunctional electrocatalyst for electrocatalytic hydrogen production and selective methanol oxidation to formate. Remarkably, The optimal Ni─MoN/NF catalyst displays exceptional HER performance with an overpotential of only 49 mV to attain 10 mA cm −2 in acid, and exhibits a high activity for MOR to achieve 100 mA cm −2 at 1.48 V in alkali. A hybrid acid/base electrolytic cell with Ni─MoN/NF electrode as anode and cathode is further developed for an integrated HER–MOR cell, which only requires a voltage of 0.56 V at 10 mA cm −2 , significantly lower than that of the HER–OER system (0.70 V). The density functional theory studies reveal that the incorporation of Ni effectively modulates the electronic structure of MoN, thereby resulting in enhanced catalytic activity. The unique combination of high electrocatalytic activity and excellent stability make the Ni─MoN/NF catalyst a promising candidate for practical applications in electrocatalytic hydrogen production and methanol oxidation.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Yougan Xiao,Jiahui Lu,Shunjian Cheng,Zilong Wang,Antong Shi,Jyunhong Shen,Zhuwu Jiang
From a preliminary performance comparison of several layered double hydroxides (LDHs), magnetically separable Ni-M LDHs (M = Fe, Al) were synthesized and applied as efficient ozonation catalysts for degrading dye Rhodamine B (RhB). As proved by various characterizations, the micromorphology, nanostructure size, and porous feature of the synthesized Ni-M LDHs significantly varied with different metal components. Among them, Ni 3 -Fe LDH and Ni 2 -Al LDH possessed a relatively larger specific surface area to react with O 3 interfacially, thereby exhibiting excellent catalytic ozonation performance. The RhB was almost completely degraded within 60 min, and the removal efficiencies of COD and TOC reached above 70% and 50%, respectively. The effects of catalyst dosage, initial dye concentration, solution pH, and coexisting inorganic anions on RhB degradation were studied systematically. ESR measurements and radical quenching experiments indicated that OH , O 2 − , and 1 O 2 are primary reactive oxygen species (ROS), while 1 O 2 induced the most dominant degradation contribution. According to the variations of ROS formation and material properties during the catalytic ozonation process, the possible reaction mechanisms were proposed. Moreover, the differences involved in the redox of multivalent metals and the transformation of surface hydroxyls over Ni-Fe and Ni-Al LDHs were further revealed.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Zhi Shen,Qi-yang Li,Shu-kui Shi,Guo Zang,Wen-jun Lv,Qiang Zhao
In order to further enrich the research on the synthesis of complexes with multi carboxyl ligands and transition metals. In this study, [1,1′-biphenyl]-2,4′-dicarboxylic acid ligand (H 2 bpda), 2,2′-dipyridyl (2,2′-dipy) and 4,4′-dipyridyl (4,4′-dipy) were used to construct metal complexes with Zn 2+ , Mn 2+ , Co 2+ and Ni 2+ by solvothermal reaction, and seven complexes were constructed, namely, [Zn(Hbpda) 2 (4,4′-dipy) 2 ] ( 1 ), [Mn(Hbpda) 2 (4,4′-dipy) 2 •(4,4′-dipy)] n ( 2 ), [Co(Hbpda) 2 (4,4′-dipy) 2 ] ( 3 ), [Ni(bpda)(4,4′-dipy) 1.5 •4H 2 O] n ( 4 ), [Mn(bpda)(2,2′-dipy)] n ( 5 ), [Co(bpda)(2,2′-dipy) •2H 2 O] n ( 6 ) and [Ni(bpda)(2,2′-dipy) •2H 2 O] n ( 7 ); Single crystal x-ray diffraction analyses reveal that complexes 1 and 3 have zero-dimensional mononuclear structure, 2, 4 and 5 have one-dimensional chain structure, 6 and 7 have two-dimensional network structure. Furthermore, solid state fluorescence properties of complexes 1–7 and magnetic properties of complexes 2, 3, 4, 5, 6 and 7 were investigated. The fluorescent test results show that complex 1 has excellent fluorescence performance and the fluorescence intensity is higher than that of ligand; The magnetic results indicate that complexes 2, 4 and 7 have ferromagentic property and complexes 3, 5 and 6 have antiferromagentic property.
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高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Jun Tang,Jinzhao Huang,Sixuan Zhang,Zehui Liu,Xiaolong Deng
Metal-phase MoS2 (1T-MoS2) is considered a promising candidate as a catalyst for the hydrogen evolution reaction (HER). However, the instability of 1T-MoS2 limits its electrocatalytic activity. Herein, we first synthesized 1T-MoS2 with excellent HER catalytic performance by a simple one-pot hydrothermal strategy of introducing the d-electron-rich transition metal atom Ni into MoS2. A bimetallic monatomic catalyst (Pt@1T-MoS2–Ni) was also prepared by modifying 1T-MoS2–Ni with Pt single atoms (Pt SAs). Experiments show that the electron transfer caused by Ni doping leads to the 1T phase transition, and the modification of Pt SAs further improves the electrical conductivity. These two factors synergistically modulate the electronic composition of MoS2 and increase the number of reactive sites. In consequence, the Pt@1T-MoS2–Ni catalyst exhibits significantly enhanced HER activity, achieving an overpotential as low as 76 mV at 10 mA/cm2 with the corresponding Tafel slope of only 46 mV/dec. Moreover, the current attenuation is negligible within 12 h, surpassing the performance of MoS2. This study offers ideas for improving the efficiency and stability of 1T-MoS2 catalyst designs.
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高影响因子
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