JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 6
·4649-4657
·
IF 2.019
Jiang Si,Wu Jihuai,Ye Beirong,Fan Yueyue,Ge Jinhua,Guo Qiyao,Huang Miaoliang
We present a facile one-step hydrothermal method to in situ grow nickel selenide (Ni 3 Se 2 ) nanosheets on nickel (Ni) foam (Ni 3 Se 2 /Ni) by using SeO 2 as selenide source, Ni foam as nickel source and NaBH 4 as reducing agent. The mole ratio of NaBH 4 /SeO 2 is optimized as 4:1. An asymmetric supercapacitor (ASC) is fabricated by using as synthesized Ni 3 Se 2 /Ni as positive electrode and activated carbon (AC) as negative electrode. The synthesized materials and assembled devices are measured and characterized by a field emission scanning electron microscopy, powder X-ray diffraction, cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The results shows that the as-synthesized Ni 3 Se 2 /Ni electrode possesses a high specific capacitance of 854 F g −1 at 1 A g −1 . The ASC can steadily operate with a high voltage of 1.6 V in 3 M KOH electrolytes, and possesses a superior energy density of 23.3 W h kg −1 at a power density of 398.1 W kg −1 . In addition, the Ni 3 Se 2 //AC ASC shows excellent charge/discharge stability, after 5000 cycles the capacitance retention reaches 91.11%. The excellent performance of Ni 3 Se 2 /Ni electrode is mainly due to the pseudo-capacitive by Ni 3 Se 2 and the 3D structure of Ni foam.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 5
·2953-2962
·
IF 4.186
Zhihao Dong,Peiyao Zhao,Zhenyong Cen,Xiaohui Wang
On the road of lead-free piezoelectric ceramics into practical applications, the study of Ni-internal-electrode (K, Na)NbO 3 -based (KNN-based) multilayer actuators (MLAs) is an important part, possessing the advantages of environmentally friendly and low cost. The Ni-internal-electrode KNN-based MLAs with different layer numbers and layer thicknesses were fabricated via the tape casting method and sintered in the reducing atmosphere. The piezoelectric layers consist of the main KNN-based phase and a trace amount of second phase Mn 4 Nb 2 O 9 . The element diffusion between the Ni electrodes and KNN-based grains is tiny, indicating that Ni is suitable for co-firing with KNN-based ceramics. After sintering, the compressive stress perpendicular to the thickness direction and the “relative tensile stress” parallel to the thickness direction are retained in the MLAs, bringing influences on the piezoelectric and dielectric properties of KNN-based materials. Compared with the bulk ceramics, the prepared MLAs significantly reduce the driving voltages and increase the displacement outputs, which are more applicable to the scenarios of miniaturization and portability. Particularly, the 46-layer actuator shows high displacements of 1580 and 2737 nm under the voltages of 100 and 200 V, respectively. However, the inverse piezoelectric coefficient d 33 * for each layer of MLAs is still lower than that of the bulk ceramics, indicating that the piezoelectric properties of the KNN-based materials are suppressed. To give full play to the piezoelectric properties of KNN-based materials, more attentions should be paid to the design of reasonable electrode structure and the development of internal electrode paste for MLAs.
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Shusheng Wan,Xiaojun Wang,Guiru Zhang,Yongcheng Wang,Jie Chen,Qiaoxia Li,Yixiao Zhang,Liwei Chen,Xiaoming Wang,Guang Meng,Kun Jiang
Utilizing renewable energy to produce green hydrogen from saline water electrolysis is becoming increasingly important yet is largely challenged by the sluggish oxygen evolution reaction kinetics, the competitive anodic chlorine evolution reaction, and the resultant electrode corrosion. Here, we report an electrochemically activated Ni-Fe oxyhydroxide catalyst that delivers an early onset potential of 1.51 V at 100 mA cm–2 within mimic saline water of 0.5 M NaCl + 1 M NaOH. During the electrochemical activation, ex situ X-ray radiation and in situ Raman characterizations reveal the structural reconstruction of amorphous Ni (oxy)hydroxide generation and electronic structure modulation from Fe intercalation. Headspace gas chromatography and iodine titration results confirm the ∼100% Faradaic efficiency toward O2 evolution on activated NiFeOxHy, whereas the long-term stability is assessed by an anion exchange membrane electrolyzer, demonstrating only 350 mV voltage decay during the 100 h continuous electrolysis at 500 mA cm–2.
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FUEL
·
2024
·
IF 6.7
Shigang Li,Xiaohui Liu,Yong Guo,Yanqin Wang
Ammonia is considered as a potential hydrogen carrier as its high hydrogen content. Hydrogen release still presents challenges due to the lack of efficient catalyst. In this work, we report a Ni@SiO 2 catalyst prepared through a sol–gel method, which displays satisfied catalytic activity and remarkable long-term stability. The origination of activity and stability has been investigated carefully by various characterizations. The strong interaction between nickel species and silica species is responsible for the excellent performance via generating small nickel particle and hindering the sintering of nickel during the high temperature reaction condition. This study offers novel insights into the design and preparation of highly efficient catalysts for ammonia decomposition to produce hydrogen.
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RSC Advances
·
2016
·Vol. 6
·期 52
·46270-46277
·
IF 3.289
Wei Shao,Jimin Wu,Hui Liu,Guanghui Dong,Shuxia Wang,Huihua Min,Min Huang
Bacterial adhesion on the surfaces of medical devices, food processing equipment, heat exchangers and ship hulls has been recognized as a widespread problem. Bacterial adhesion on a surface is influenced by surface physical and chemical properties of the surface. In this paper, polyethyleneimine (PEI) grafted graphene oxide (GO) nanosheets were incorporated into Ni–P coatings by an electroless plating technique to modify the surface energy, and therefore to influence the interactions between the prepared surfaces and the tested bacteria. Ni–P–GO coatings were investigated by SEM, AFM, Raman spectrum and XPS. Contact angles of Ni–P–GO coatings with different GO loadings were tested and the surface free energies and their dispersive and polar components were calculated using the van Oss acid–base approach. The results showed that the surface free energies of the coatings had a significant influence on S. aureus adhesion. The Ni–P–GO coatings showed excellent antibacterial adhesion activity. Extended DLVO theory is used to explain the antibacterial adhesion behavior. The novel coatings reported here can be used in controlling bacterial adhesion and biofilm formation for various applications.
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Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Hao Zhou,Yikai Wang,Hua Wang,Heye Fu,Ranran Li,Yuekai Zhang,Hong Zhao,Cuishuang Jiang,Tingting Yu,Xia Sun,Maoshuai He,Wenxian Wei,Tao Yang
Hydrogen has garnered attention as a promising carbon-free energy carrier capable of addressing escalating energy demands and environmental concerns. However, hydrogen production via alkaline water electrolysis is hindered by the sluggish kinetics of oxygen evolution reaction (OER). Although Ni₃Se₂ has attracted interest as a non-precious metal-based OER catalyst, its performance remains suboptimal. In this work, we present a trimetallic-doped electrocatalyst, CoWCe-Ni₃Se₂, which exhibits outstanding OER performance in alkaline media. The catalyst demonstrates only 204 mV to achieve a current density of 100 mA cm⁻², along with a notably small Tafel slope of 33.59 mV dec⁻¹. Furthermore, it shows exceptional operational durability, maintaining 95% of its initial activity over 90 hours of continuous electrolysis. Mechanistic insights derived from density functional theory (DFT) calculations reveal that the co-doping of W and Ce facilitates the adsorption of critical *OOH intermediates and significantly lowers the energy barrier of the rate-determining step (RDS). The enhanced catalytic performance is attributed to the improved electrical conductivity, increased active surface area, and optimized adsorption/desorption behavior of reaction intermediates. Beyond introducing a highly active and stable OER electrocatalyst, this study provides a fundamental understanding of the synergistic effects of multi-element doping for the rational design of high-performance catalysts.
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INTERNATIONAL JOURNAL OF MODERN PHYSICS B
·
2022
·
IF 1.404
Dongdong Zhang,Pan Zhang,Jiahuan Chen,Zhen He,Mingfang Wu
This study develops the Ni–Fe–P–TiO 2 nanocomposite coatings via an electroless deposition process. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to determine the coating structures. Hardness and wear tests were conducted to measure the coating’s mechanical performance, and polarization curves were recorded to evaluate the corrosion behavior. The results show that the TiO 2 nanoparticles are incorporated into the coatings. The proper addition of TiO 2 refines the coating surface morphology without changing the coating phase constituents. The best mechanical and corrosion performance is obtained for the 0.5-g/L modified Ni–Fe–P–TiO 2 sample, owing to its compact surface feature and well-dispersed TiO 2 nanoparticles.
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ACS Nano
·
2025
·
IF 16
Zhaowen Bai,Subash Kandasamy,Wei Wang,Rui Zhou,Zhenjie Zhang,Xuefeng Wang,Jiatu Liu,Zhenbin Wang,Guohua Chen,Qingyu Kong,Tianyi Li,Yang Ren
High-nickel layered oxides are promising cathode materials for next-generation lithium-ion batteries due to their high energy density, but their structural instability at high voltages remains a critical challenge. This study investigates how Ni migration influences phase segregation, Li/Ni antisite defect accumulation, and mechanical degradation in LiNiO2 (LNO) through a combination of synchrotron X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), transmission electron microscopy (TEM), and density functional theory (DFT) calculations. The results reveal that at high voltages, Ni migrates into tetrahedral sites, leading to the formation of coexisting R3̅m phases with distinct lattice behaviors. This phase segregation induces inhomogeneous lithium distribution, internal stress, and strain accumulation, ultimately promoting microcrack formation and accelerating structural degradation. While Ni migration is partially reversible upon discharge, continuous cycling leads to the progressive accumulation of Li/Ni antisite defects, which disrupt Li-ion transport and further destabilize the structure. The findings describe the role of bulk Ni migration in phase segregation, linking atomic-scale lattice distortions to long-term performance limitations in high-Ni cathodes. These insights suggest strategies such as selective doping to mitigate Ni migration and improve the structural stability.
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DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2012
·
IF 1.867
Y.H. You,C.D. Gu,X.L. Wang,J.P. Tu
Pure Ni and three Ni–Co alloys films, i.e. Ni–4 wt.%Co, Ni–18 wt.%Co, and Ni–40 wt.%Co, are electrodeposited at room temperature from the choline chloride/ethylene glycol deep eutectic solvent dissolved by nickel or/and cobalt chlorides. Electrodeposition mechanism, microstructure, and corrosion properties of the films are investigated. Surface morphology and chemical composite of the films are significantly dependent on the Ni 2+ and Co 2+ concentrations in the electrolytes. Interestingly, it is found that the amount of cobalt in the Ni–Co alloy films is significantly lower than that present in the electrolytes, which indicates an absence of anomalous codeposition process for the non-aqueous electrolytes. However, anomalous codeposition of Ni–Co deposits is frequently observed for the aqueous electrolytes. The Ni–Co alloy films possess face-centered cubic structures and refined grains revealed by X-ray diffractometer and scanning electron microscope . Potentiodynamic polarization measurements show that the Ni film exhibits the noblest corrosion potential and the lowest corrosion current compared with the Ni–Co alloys films. Moreover, the more Co content the Ni–Co films have, the more negative corrosion potential and the higher corrosion current the films exhibit.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Baosong Li,Weiwei Zhang,Yingjie Liu,Zhenghong Xu,Yanjie Wang,Bo Chen
Ni–W/WS 2 and Ni–W/CrN–WS 2 composite coatings were fabricated via continuous electrodeposition from a dilute citrate-based electrolyte containing varying concentrations of WS 2 nanoparticles. The influences of WS 2 content on the surface morphology, elemental composition, phase structure, surface roughness, chemical valence states and corrosion behavior were systematically explored. The results demonstrate that the incorporation of WS 2 nanoparticles refines the grain structure, reduces surface roughness, suppresses particle agglomeration, and promotes the formation of a denser and more homogeneous microstructure. When the concentration of WS 2 exceeds 8 g L −1 , WS 2 particles induce agglomeration and increase internal defects within the coating, thereby impairing its structural compactness and corrosion resistance. XRD and XPS analyses confirm that CrN and WS 2 are successfully co-deposited into Ni–W coating without changing the primary chemical states of Ni, W, Cr, N and S. AFM measurements reveal that 6 g L −1 WS 2 effectively reduces the surface roughness, which is beneficial to the improvement of tribological properties. EIS results demonstrate that 1 g·L −1 WS 2 significantly enhances the anti-corrosion property of Ni–W/WS 2 deposit with the highest R p 123.78 kΩ·cm 2 ( R c 64.47 plus R ct 59.21 kΩ·cm 2 ), forming a reliable physical barrier against corrosive media. In contrast, for the dual-particle synergistic strengthening phase of CrN–WS 2 , the anti-corrosion property of Ni–W/CrN–WS 2 coating is gradually improved as the addition amount of WS 2 increases, reaching the optimal performance at 8 g·L −1 . The corrosion resistance of the Ni–W/CrN–WS 2 coating improves as the WS₂ concentration rises, peaking when the WS₂ concentration is 8 g·L⁻¹ . The synergistic effect of CrN ceramic particles and WS 2 solid lubricant optimizes the microstructure and anti-corrosion performance of Ni–W composite coatings. These composite coatings demonstrate significant potential as corrosion-protective coatings in aggressive service environments, including marine environment and oil–gas pipeline systems.
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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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JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Yanan Liu,Jiaying Zhao,Junting Feng,Yufei He,Yiyun Du,Dianqing Li
Environmental benign non-noble NiCu catalysts with well-distributed homogeneous nanoalloy structure was fabricated from layered double hydroxide for semi-hydrogenation of acetylene. Compared with monometallic Ni catalyst, the introduction of Cu enhanced ethene selectivity and decreased the deactivation rate in long-term reaction. Furthermore, to give a thorough understanding on structure dependent performance, conventional impregnation was also used to obtain bimetallic NiCu catalyst for comparison. Interestingly, imp-NiCu/MMO presented the mixture of monometallic Ni, Cu and bimetallic NiCu. Catalytic results indicated that 100% conversion was achieved at 160 °C with improved selectivity (>70%) over NiCu nanoalloy catalyst, while bimetallic NiCu catalyst with mixed structure showed both poor conversion (50%) and selectivity (65%). Enhanced activity was attributed to small particle size (3.2 nm) and high metal dispersion (31.4%). Improved selectivity and anti-coking ability were related to the alloying of Ni with Cu, which was conducive to isolate Ni atoms from one another confirmed by STEM-EDX and transfer electron from Cu to Ni certified by XPS. Additionally, superior performance was also found in semi-hydrogenations of hexyne, phenylacetylene, 1,2-diphenylethyne and ethyl phenylpropiolate over NiCu nanoalloy.
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