ACS Catalysis
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2022
·
IF 13.7
Zinan Huang,Xianping Liao,Wenbiao Zhang,Jialai Hu,Qingsheng Gao
Modulating the dynamic change of catalysts is significant for understanding the mechanism and exploiting better electrocatalysts but remains challenging in oxygen evolution reaction (OER). Herein, ceria-promoted reconstruction of Ni-X (X = S, P, and O) is investigated to unravel the correlation between the reconstructed surface and the OER performance, which further guides the design of prominent electrocatalysts. Interfacial CeO2 promotes the in situ reconfiguration of Ni-X via strengthening hydroxyl adsorption, generating highly active CeO2-NiOOH interfaces. Moreover, rich oxygen vacancies formed after breaking Ni-S/P bonds and leaching S/P anions render Ni3S2 and Ni2P superior to NiO with the same CeO2 modification, highlighting another dependence on pre-catalyst materials chemistry. Theoretical analysis further confirms that the co-presence of CeO2-NiOOH interfaces and oxygen vacancies can harmoniously regulate intermediate chemisorption toward favorable OER kinetics. As a proof of concept, CeO2-modified Ni3S2 exhibits low overpotentials of 251 and 364 mV at the current densities of 10 and 100 mA cm–2 in 1.0 M KOH, respectively, performing among the best of recently reported Ni-based counterparts.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Rongying Zhu,Yaodong Yu,Renqin Yu,Jianping Lai,Joey Chung-Yen Jung,Shiming Zhang,Yufeng Zhao,Jiujun Zhang,Zhonghong Xia
It remains a huge challenge to develop methanol oxidation electrocatalysts with remarkable catalytic activity and anti-CO poisoning capability. Herein, PtIrNi and PtIrCo jagged nanowires are successfully synthesized via a facile wet-chemical approach. Pt and Ir components are concentrated in the exterior and Ni is concentrated in the interior of PtIrNi jagged nanowires, while PtIrCo jagged nanowires feature the homogeneous distribution of constituent metals. The PtIrNi and PtIrCo jagged nanowires exhibit mass activities of 1.88 A/mg Pt and 1.85 A/mg Pt , respectively, 3.24 and 3.19 times higher than that of commercial Pt/C (0.58 A/mg Pt ). In-situ Fourier transform infrared spectroscopy indicates that CO 2 was formed at a very low potential for both nanowires, in line with the high ratio of forward current density to backward current density for PtIrNi jagged nanowires (1.30) and PtIrCo jagged nanowires (1.46) relative to Pt/C (0.76). Also, the CO stripping and X-ray photoelectron spectroscopy results substantiate the remarkable CO tolerance of the jagged nanowires. Besides, the two jagged nanowires possess exceptional activities toward ethanol and ethylene glycol oxidation reactions. This work provides a novel line of thought in terms of rational design of alcohol oxidation electrocatalysts with distinctive nanostructures .
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PubMed
高影响因子
Coatings
·
2022
·Vol. 12
·期 8
·1223
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IF 3.236
Yutao Yan,Lifeng Lu,Yuqiu Huo,Yong Zhao
Among the preparation methods of functional coatings, the electrodeposition technique has attracted much attention due to its advantages of economy, high efficiency and good structural adaptability. The application of aluminum alloy materials is greatly limited due to their poor friction reduction and wear resistance. Therefore, to enhance the tribological behaviors of aluminum alloy materials, the Ni-MoS2, Ni-SiC and Ni-MoS2/SiC composite coatings were prepared on the 2218 aluminum alloy by an electrodeposition technique. The prepared composite coating samples exhibited a compact and dense microstructure, which was consistent with the result of their high microhardness. No obvious microcracks and defects appeared at the interfaces, indicating that the composite coating samples had good adhesion to the substrates and can effectively improve the frictional shear resistance. The results of wear experiment showed that the wear rate, friction coefficient and friction response time of all composite coating samples were lower than that of the substrate sample. However, the friction reduction and wear resistance of the same composite coating sample were not consistent. The friction coefficient of the Ni-MoS2composite coating sample was the lowest, and the wear rate of the Ni-SiC composite coating sample was the lowest. According to the worn surface observations, the wear mechanism of composite coating samples was mainly characterized by the mild abrasive wear, flake spalling, tearing and pits caused by particle shedding, and the substrate sample showed a severe adhesive wear and abrasive wear.Keywords:electrodeposition;composite coating;microstructure;friction;wear mechanism
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高影响因子
CARBON
·
2022
·
IF 11.307
Dawei Liu,Lei Yang,Fengyuan Wang,Hao Zhang,Jia Liu,Tong Lv,Hongjie Zhao,Yunchen Du
The construction of special three-dimensional microstructure is becoming an extremely fascinating approach to upgrade the electromagnetic properties of carbon-based microwave absorption materials (MAMs) recently. Herein, we have demonstrated the successful fabrication of a series of carbon nanotubes (CNTs)@Ni/C foams (CNCFs) through two-step pyrolysis processes . It is found that the loading amount of CNTs has an obvious influence on modulating the electromagnetic diameters of CNCFs, and thus effectively tuning their microwave absorption properties . With the relative carbon content of 66.3 wt%, CNCFs-2 exhibits admirable microwave absorption performance , including the effective absorption bandwidth of 5.8 GHz with the absorber thickness of 1.8 mm and the maximum reflection loss intensity of −47.0 dB therein. Electromagnetic analysis reveals that the intrinsic attenuation ability, well-matched characteristic impedance , and multiple reflection effect synergistically work for the excellent reflection loss characteristics of CNCFs-2, which indicates rational microstructure design and appropriate chemical composition regulation are vitally important for the enhancement of microwave absorption performance. We believe these desirable microwave absorption properties can make CNCFs-2 eligible to be a very promising candidate for high-performance MAMs, and this research will provide some inspirations more or less for the development of more advanced carbon-based MAMs in the future.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 2
·505-514
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IF 2.606
Zou Chang,Guo Xingzhong,Wang Fan,Tian Rui,Hou Yang,Liu Fu,Yang Hui
Three-dimensional macroporous heterostructural Ni-Fe hydroxides with different mole ratio (Ni x Fe (1−x) -PH) were prepared via a sol-gel process combined with phase separation, and the overall water splitting electrocatalytic activity of the resultant macroporous Ni-Fe hydroxides were investigated in detail. The as-prepared Ni-Fe hydroxide has cocontinuous skeletons and interconnected macropores with a narrow pore size distribution (~150 nm), and possesses outstanding electrocatalytic activity with an overpotential of 263 mV for oxygen evolution reaction (OER) and 175 mV for hydrogen evolution reaction (HER) at 10 mA·cm −2 in 1 M KOH, respectively. The Ni 0.6 Fe 0.4 -PH | | Ni 0.6 Fe 0.4 -PH has efficient overall water splitting performance with a cell voltage of 1.61 V at 10 mA·cm −2 and great stability. The fantastic macropore structure and strong synergistic effect between Ni-Fe hydroxides significantly reinforce the contact area between the electrocatalyst and electrolyte, and endow high electrocatalytic performance of bifunctional electrocatalysts.
The epoxide-induced sol-gel process accompanied by phase separation allows the synthesis of macroporous heterostructural Ni-Fe hydroxide bifunctional catalyst with a mass of active sites, displaying excellent electrocatalytic activity and low overpotential at several current densities for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).
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高影响因子
COMPOSITE INTERFACES
·
2022
·
IF 2.839
Han He,Yehua Jiang,Juanjian Ru,Rong Zhou,Yixin Hua
The surface metallization of zirconia-toughened alumina (ZTA) particles with Ni–Cu bimetallic coatings is performed by electroless plating assisted with choline chloride–ethylene glycol (ChCl-EG) ionic liquid. The possible reactions and deposition sequences of the plating process have been analyzed based on the micro-morphologies of the Ni–Cu coated ZTA (ZTA@Ni–Cu) particles obtained at different reaction stages. The roles of ChCl-EG additive, reaction temperature, and ZTA concentration on the surface morphology, coating thickness, and element content of the ZTA@Ni–Cu particles are also investigated. Results show that uniform cauliflower-characteristic Ni–Cu coatings are formed on ZTA surfaces with 35 g·L−1 ChCl-EG at 65°C. The coating thickness is about 26.9 μm, and the element contents of Cu and Ni are 38.1 at% and 61.9 at%, respectively. Besides, a schematic illustration about the fabrication of ZTA@Ni–Cu particles is proposed to elaborate the formation process of Ni–Cu coatings and the function mechanism of ChCl-EG additive.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Lei Fan,Yuchao Lyu,Jianye Fu,Yupeng Tian,Furang Li,Wenjing Zhang,Xinmei Liu
The prominent size effects of metal nanoparticles (NPs) are mainly reflected in the change of electronic and geometric properties, which may induce distinct catalytic performance of the catalyst. Herein, Ni/SAPO-11 bifunctional catalysts with controllable sizes of Ni NPs were synthesized to investigate the particle size effects in n-hexane hydroisomerization. The results show that decreasing Ni particle size from 11.7 to 5.3 nm increases the concentration of surface Ni atoms and the proportion of low-coordinated Ni sites (corner, step sites) by 1.7 and 1.5 times, respectively. The low-coordinated surface Ni atoms have rich dangling bonds and high surface energy, resulting in greatly improved H 2 adsorption and activation abilities. Moreover, an increased proportion of low-coordinated Ni sites within the Ni cluster shifts the d-band center upward, further enhancing the adsorption and activation of reactants. The intrinsic catalytic activity (turnover frequency) of 5.3 nm Ni NPs is ca. 2 times as much as that of the 11.7 nm ones. Besides, the smaller Ni NPs enhanced the metal–acid synergy, leading to a higher selectivity to isomers. This work provides deep insights into the metal particle size effects over the bifunctional Ni/SAPO-11 hydroisomerization catalysts and can be extended to various metal supported catalysts.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Yuxin Wang,Gaofeng Zhang,Zhen He,Jiahuan Chen,Wei Gao,Peng Cao
This study investigated the electrodeposition of a three-dimensional nanocone-shaped surface structure on SUS304 stainless steel substrates. Different electrodeposition parameters were adopted to generate nanocone-shaped Ni coatings. A detailed description of the coating microstructure and composition is proposed to understand how Ni nanocones develop throughout electrodeposition. A series of wetting tests compared the superhydrophobicity of the Ni nanocone coating. Wear tests were used to verify their mechanical stability. The best superhydrophobic and mechanical performance is achieved after 25 min electrodeposition, where the newly formed Ni nanocones grow to provide additional air cushion to support surface water droplets and promote wear resistance. The superhydrophobic Ni coating also has good anti-icing properties. Water droplets begin to freeze from the contact points between the water and the sample surface. Surface damage, such as scratches and holes, reduces superhydrophobic samples' anti-icing properties.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 44
·20279-20285
·
IF 3.3
Xiaoqian Peng,Jing Zhang,Xu Zhang,Xiaochan Liu,Zhiqiang Huang,Haibo Li,Xibin Yi
Hydrogen is regarded as one of the most promising energy sources of the future, due to its low-cost, zero-pollution, and high-heat value. Nevertheless, traditional methods of storing hydrogen are commonly accompanied by the risk of leaks and explosions, so how to store and transport hydrogen safely and efficiently is a critical issue that needs to be addressed. Solid-state hydrogen storage is the most attractive way to store hydrogen in nanomaterials by chemical or physical adsorption, which has the advantages of high energy density and good safety. Here, a rational Ni–Zn bimetallic MOF has been constructed by a straightforward synthetic technique, in which the Zn atom was partially replaced by the Ni atom. The micropore rate of the Ni–Zn bimetallic MOFs is higher than that of ZIF-8. In addition, the presence of Ni provides more unsaturated metal sites and strengthens the bonding between hydrogen molecules and Ni, effectively improving the hydrogen storage capacity of Ni–Zn bimetallic MOFs. The experimental results show that the hydrogen adsorption capacity of Ni–Zn bimetallic MOFs can reach 1.35 wt% at 77 K and 1 bar.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lingxin Kong,Jing Qiao,Yunfei Yang,Xue Zhang,Fenglong Wang,Zhou Wang,Lili Wu,Jiurong Liu
Electromagnetic (EM) wave absorption materials with excellent absorption performances are highly desirable because of military applications and EM radiation pollution protection. In this work, we have synthesized and demonstrated the flakes-assembled porous ZnO/Ni hybrid nanotubes by combining electrospinning and hydrothermal reaction , coupled with following calcination and reduction process. The rational-designed ZnO/Ni nanocomposites exhibited extremely superb EM wave absorption property with a minimum reflection loss (RL) of −71.2 dB at 15.3 GHz, corresponding to a thickness of 3.4 mm and the maximum effective absorption bandwidth (RL≤–10 dB) is up to 9.4 GHz (8.6–18.0 GHz) with the thickness of 4.2 mm. The significant performance improvement originated from that the unique three-dimensional architecture optimized impedance matching characteristics and magnetic-dielectric synergetic effect contributed to a strong attenuation capacity. This work provided a feasible strategy to synthesize flakes-assembled nanotube microstructure and the ZnO/Ni composites promised great potential in the EM wave absorption fields.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Liang Shi,Xueying Wang,Rui Peng,Gang Wang,Cheng Liu,Xiaolei Shi,Dainan Zhang,Huaiwu Zhang
Ni 2+ modified MgTa 2 O 6 ceramics with a trirutile phase and space group P4 2 /mnm were obtained. The correlations between crystallographic characteristics and microwave dielectric performance of MgTa 2 O 6 ceramics were systematically studied based on the chemistry bond theory (PVL theory) for the first time. The results indicate that the introduction of Ni 2+ causes a change in polarizability and the Mg–O bond ionicity, which contributes to the variation of dielectric constant. Moreover, the lattice energy, and packing fraction, full width at half maximum of the Raman peak of Ta–O bond, as the quantitative characterization of crystallographic parameters, regulate the dielectric loss of MgTa 2 O 6 ceramics in GHz frequency band. In addition, the study of sintering behavior shows that the densification and micromorphology are the crucial factors affecting the microwave dielectric performance. Typically, Ni 2+ doping on the A-site of MgTa 2 O 6 can effectively promote the Q × f values to 173,000 GHz (at 7.43 GHz), which ensures its applicability in 5G communication technology.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Guixian Deng,Guifang Zhang,Xing Zhu,Qingjie Guo,Xiangbiao Liao,Xi Chen,Kongzhai Li
Reduction of CO 2 in presence of oxidative impurity ( e.g. , O 2 ) is more promising than utilization of pure CO 2 due to skyrocketing cost for purification of captured CO 2 from air or industrial exhaust gas. In this work, Ni-based catalysts are modified by CeO 2 and ZrO 2 to suppress negative effect of O 2 on reforming of CO 2 with methane, which show high CH 4 conversion (97 %) and CO 2 conversion (95 %) at 750 °C and can maintain high CO 2 conversion even with high O 2 content. The physicochemical characterizations on fresh and spent catalysts show that the interaction among Ni, CeO 2 and ZrO 2 results in well dispersion of smaller Ni particles, even after long-term testing. In situ DRIFTS results show that Ni/CeO 2 -ZrO 2 -SiO 2 catalyst shows advantage to activate CH 4 to generate active CH 3 *, promoting the formation of CO, and the CeO 2 -ZrO 2 solid solution improves the CO 2 adsorption, thereby reducing the competitive effect of CO 2 and O 2 .
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