NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 3
·1551-1561
·
IF 3.069
Long Meng,Yunan Wu,Kai Pan,Ye Zhu,Xiaojie Li,Wei Wei,Xiaoya Liu
Nickel-titanium alloy (NiTi alloy) has recently received an increasing amount of attention. However, the release of toxic nickel ions and the threat of implant infections has limited its clinical applications. Thus, we report a promising copolymer coating with excellent nickel ion (Ni2+) inhibition release, cytocompatibility, and antimicrobial properties to solve these safety issues involving NiTi alloy implantation. Quaternized copolymers poly (7-hydroxy-4-methylcoumarin methacrylate-co-2-hydroxyethyl methacrylate-co-2-(dimethylamino)ethyl methacrylate) (PCHD-Q) with many hydroxyl and tertiary amine groups were first synthesized, self-assembled into nanoparticles, and then deposited on NiTi substrate through electrodeposition. After UV irradiation, scanning electron microscopy (SEM) images revealed that homogeneous, continuous, and dense coatings were obtained. The coatings showed good improvement of protective behavior for the NiTi alloy in an in vitro environment and could significantly decrease the release of Ni2+ through physical barriers and physical adsorption, which could obviously reduce cytotoxicity inducing by Ni2+. According to in vitro cell viability and antibacterial tests, the quaternized coating materials not only provided a relatively stable biointerface for cell adhesion, spreading and growth, but also obtained excellent antimicrobial activity for the bare NiTi alloy against S. aureus and E. coli. These results suggested that our coatings materials have the potential for improving the safety and success rate of NiTi-based implantations.
研究领域:
材料科学
·
生物医学工程
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表面涂层技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Qinglin Han,Yuhong Luo,Guihua Liu,Yanji Wang,Jingde Li,Zhongwei Chen
Transition metal phosphides (TMPs) and sulfides (TMSs) are widely-reported electrocatalysts for hydrogen evolution reaction (HER) in alkaline media. However, the origin of their high HER catalytic activity remains unclear. Herein, the transition of Ni x Fe 1-x P and Ni x Fe 1-x S in catalyzing HER reaction is systematically investigated by X-ray photoelectron spectroscopy and in-situ Raman technique. It was found that, during HER reaction, dissolution of S and P occurs and is accompanied with dynamic evolution of the catalyst surface. The dissolution of P in Ni x Fe 1-x P leads to in-situ generation of α-FeOOH species, whereas Ni x Fe 1-x S is found partially transformed into γ-FeOOH phase. Density functional calculations reveal that the α-FeOOH (1 1 1) surface exhibits more delocalized electrons offering promoted HER reaction kinetics over γ-FeOOH (0 1 0), and thus contributes the improved activity of Ni x Fe 1-x P pre-catalyst. This study unveils the distinct origin of HER activity of TMPs and TMSs, providing potential guidance for the rational design of active HER electrocatalysts.
研究领域:
电化学
·
材料科学
·
催化作用
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Xinyue Luo,Hongqin Ma,Junyu Gao,Luqi Yu,Xingpeng Gu,Jiahao Liu
The development of an effective and inexpensive electrocatalyst for the oxygen evolution reaction (OER) is the key to achieve high hydrogen production since water splitting has sluggish OER kinetics. Herein, a composite of nickel-rich nickel nitride (NR-Ni3N) with graphitic carbon nitrides (GCNs) was prepared for the electrocatalytic OER, showing a low overpotential of ∼290 mV, a small Tafel slope of ∼70 mV dec–1 at 10 mA cm–2 current density, and low loss of activity after 36 h of test in an alkaline electrolyte, outperforming the pure Ni3N and even the noble catalyst RuO2. The characterization results revealed that the defective GCNs can promote the generation of a Ni-rich region in Ni3N in the nitridation process, and the high conductivity of the formed robust Ni–Ni3N heterojunction and its strong synergistic effect with GCNs explain the excellent OER electrocatalytic performances of NR-Ni3N/GCNs. This work provides a novel feasible strategy for the development of highly active OER electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 7
·070539
·
IF 4.316
Runyue Qin,Yunpeng Pan,Zeang Duan,Huanhuan Su,Kailiang Ren,Wenfeng Wang,Yuan Li,Ning Xi,Yu Wang,Lu Zhang,Shumin Han
Nickel layered double hydroxide, Ni(OH)2, has been widely used as the cathode for nickel based battery systems. However, the currently commercialized β-Ni(OH)2 is limited by its low capacity. In contrast, α-Ni(OH)2 can give higher capacity, but it is challenging to stabilize in alkaline solution due to the conversion to β-Ni(OH)2. Herein, we use zinc doped Ni(OH)2 and control its spherical morphology to strengthen the stability of α-Ni(OH)2 in a nickel metal hydride battery system. With an optimal zinc doping content of 3 mol% for the spherical α-Ni(OH)2 (Ni-Zn3), the cathode shows the highest discharge capacity of 351.3 mAh g–1 at a current density of 70 mA g–1 (0.2 C) and superior rate performance, which even delivers 271.5 mAh g–1 at 5 C. More importantly, the durability of the Ni-Zn3 cathode is significantly enhanced, which maintains 81.7% after cycling 360 times, almost twice as long as that of pure α-Ni(OH)2. Studies show that the stabilized Ni–O bond and suitable aperture structure are mainly responsible for the advanced electrochemical properties of the Ni-Zn3. The results show that proper zinc doping spherical α-Ni(OH)2 with low-cost and high performance is an promising cathode material for nickel-based battery systems.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2022
·Vol. 156
·期 1
·
IF 4.304
Lei Xueyan,Fu Zhengping,Xiang Bin,Lu Yalin
The low stability and poor activities of transition metal selenides (TMSs) in alkaline electrolyte limit their application in supercapacitors. Metal doping and hybridization of various electroactive materials with different properties are utilized to enhance the electrochemical performance of TMSs by optimizing their electronic structure and providing rich electrochemical active sites. Herein, we report a simple two-step hydrothermal method for the growth of Zn-doped NiSe 2 and Ni(OH) 2 nanocomposites on Ni foam [Zn–NiSe 2 /Ni(OH) 2 ]. The resulting material delivers high specific capacity (1525.8 C g −1 /564.7 mA h g −1 at 6 A g −1 and 1220 C g −1 at 10 A g −1 ) in a three-electrode system. A Zn–NiSe 2 /Ni(OH) 2 //porous carbon (PC) aqueous asymmetric supercapacitor (ASC) was built by utilizing Zn–NiSe 2 /Ni(OH) 2 as the positive electrode and PC as the negative electrode. This Zn–NiSe 2 /Ni(OH) 2 //PC ASC shows an energy density of 75.8 W h kg −1 at a power density of 916.1 W kg −1 and achieves a specific capacity retention of 100% after 25 000 cycles at 10 A g −1 . These results reveal that the Zn doping and the hybridization of NiSe 2 with Ni(OH) 2 can obtain impressive electrochemical properties in ASCs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 35
·16810-16817
·
IF 9.931
Dazhong Zhong,Lei Zhang,Chengcheng Li,Dandan Li,Congcong Wei,Qiang Zhao,Jinping Li,Jinlong Gong
Electrochemical water splitting into hydrogen and oxygen is one of the most promising strategies for the utilization and storage of solar energy. However, the sluggish kinetics of the oxygen evolution reaction (OER) hinder its larger-scale application. NiFe-based catalysts are some of the most efficient oxygen evolution catalysts (OECs). High-valence Ni is considered as an active site or conductive framework in NiFe-based OECs. However, the oxidation of Ni is usually hindered in the presence of Fe. This paper describes an effective strategy to produce NiFe (oxy)hydroxide with easily oxidized Ni and a hierarchical nanosheet structure as the most efficient OEC. High valence Ni may provide frameworks with good conductivity and facilitate OERs in Fe active sites. In addition, the hierarchical structure can increase the electrochemical surface area, resulting in more active sites for the OER. The as-prepared Fe–O–Ni(OH)2 supported on nickel foam needs overpotentials of 185, 220 and 261 mV to drive current densities of 10, 100 and 500 mA cm−2, respectively. The catalyst also shows excellent stability at the current densities of 100 and 500 mA cm−2 for 50 hours.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Yanwei Sui
Herein, we design and construct the hierarchical NiCo 2 O 4 @Ni 0.85 Se core-shell architecture directly growing on Ni foam as advanced materials for supercapacitor . The composite materials deliver excellent electrochemical performance with a high specific capacitance of 1454 F/g and superior cycle life with 88.5% retention after 10000 cycles, which ascribed to the synergistic effect of pure NiCo 2 O 4 and Ni 0.85 Se. Furthermore, the NiCo 2 O 4 @Ni 0.85 Se//AC asymmetric supercapacitor were fabricated with a highest energy density of 29.3 W h kg −1 at power density of 799 W kg −1 . It is expected that the NiCo 2 O 4 @Ni 0.85 Se will be a kind of promising electrode materials for supercapacitor.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 14
·146509
·
IF 3.721
Yijun Liu,Suyu He,Fengping Zhan,Feng Gao,Wei Sun,Qingxiang Wang
Developing robust and low-cost electrocatalysts for efficient hydrogen evolution reaction (HER) through facile methods is of great significance to the energy and environment sustainability. Herein, a simple one-pot solvothermal method has been developed to synthesize a hybrid material of nickel@nickel carbide (Ni@Ni3C) nanochain embedded in a network of single-walled carbon nanotubes (SWCNTs). The electrochemical experiments indicate that the composite of Ni@Ni3C-SWCNTs has the HER electrocatalytic performance comparable to that of Pt/C in an acidic medium (0.5 M H2SO4). The overpotential to reach a current density of 10 mA cm−2 in 0.5 M H2SO4 is only −74 mV with a Tafel slope of 46.9 mV dec−1. Compared to Ni@Ni3C in the absence of SWCNTs, the enhanced HER performance of Ni@Ni3C-SWCNTs can be attributed to the increased intrinsic activity, improved electronic conductivity, and the electron coupling effect between Ni@Ni3C and SWCNTs. The Ni@Ni3C-SWCNTs composites also show high stability at the overpotential of −0.2 V for 24 h. This work provides guidance for the synthesis of high-performance non-precious metal electrocatalysts for HER.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Shengnan Hu,Shiquan Wang,Chuanqi Feng,Huimin Wu,Jiujun Zhang,He Mei
Developing bifunctional catalysts toward urea oxidation and hydrogen evolution is a huge challenge. In this study, novel MOF-derived nickel nitride on nickel foam catalysts were successfully synthesized at different temperatures (300, 350, 400 °C) (denoted as C-T, T = 300, 350, 400). C-350 was demonstrated to be a highly active and durable 3D catalyst toward urea oxidation reaction (UOR), with a required potential of 1.337 V at 10 mA/cm2. At the same time, C-350 has higher catalytic performance toward hydrogen evolution reaction (HER) than other materials with a low overpotential of 47 mV at 10 mA/cm2. Furthermore, its two-electrode alkaline electrolyzer only needs a voltage of 1.503 V to obtain 100 mA/cm2, which is 0.160 V lower than that of pure water splitting. Also, the current density can be maintained for at least 24 h, showing its potential for practical applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Electrocatalysis
·
2022
·Vol. 14
·期 2
·247-258
·
IF 2.933
Zhao Zhipeng,Liu Yinmeng,Yi Wenjing,Wang Haiyang,Liu Zhongyi,Yang Jing-he,Zhang Meng
Binder-free nickel–cobalt phosphate (NiCoPO) micro flakes are evenly grown on the nickel foam (NF) by a simple hydrothermal method, which can act as a highly efficient bifunctional electrocatalyst (NiCoPO/NF) for both oxygen evolution reaction (OER) and urea oxidation reaction (UOR). NiCoPO/NF presents the relatively prominent OER and UOR activities with ultralow potentials of 1.51 V and 1.34 V (vs. reversible hydrogen electrode) to reach the current density of 100 mA cm −2 , respectively. The outstanding UOR and OER performance of NiCoPO/NF might be attributed to the fact that the successful incorporation of oxygen atoms into Ni/Co phosphate is beneficial for the oxidation of metal atoms at high overpotential. In addition, NF can improve the electrical conductivity to accelerate the electron transfer from the electrode to the catalyst. Additionally, in the alkaline solution (1 M KOH), NiCoPO/NF shows excellent durability and stability after the consecutive OER and UOR tests for 48 h. The design of NiCoPO/NF would pave the way to construct more efficient bifunctional electrodes for electrocatalytic water splitting with or without urea in alkaline solution, which provides a novel technological platform for the conversion of human waste into the sustainable energy. Graphical Abstract
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
POLYHEDRON
·
2018
·
IF 2.067
Yuxiang Zhang,Liyong Du,Xinfang Liu,Yuqiang Ding
In this study, a nickel(II) compound with guanidinate ligand of the general form [((Me) 2 NC( i PrN) 2 ) 2 Ni] has been synthesized and isolated from the reaction of NiCl 2 with the corresponding lithium salt of guanidinate ligand [(Me) 2 NC( i PrN) 2 Li] at 70 °C. Its structure was determined by 1 H NMR, elemental analysis, and single crystal X-ray diffraction. Thermogravimetric analysis (TGA) was employed to study the thermal properties (including thermal stability, volatility, vapor pressure and transport behavior) of compound. Furthermore, a deposition experiment was made to examine the compound’s potential as CVD precursor, and a Ni metal film was successfully deposited. These preliminary results illustrate the potential of this compound to act as CVD precursor.
研究领域:
材料化学
·
表面科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yaoyao Li,Jianwen Huang,Gaofeng Rao,Chunyang Wu,Xinchuan Du,Yinghui Sun,Xianfu Wang,Chengtao Yang
Considering the expensive and rare property of noble-metal based materials, great efforts are made to synthesize high-activity, economical and electrochemically stable catalyst for oxygen evolution reaction (OER) in harsh alkaline. Heterogeneous materials coupled by transition metal and carbon exhibit high capability for OER in recent years. Here, three-dimensional (3D) porous carbon coupled with Ni and NiO hybrid nanoparticles (Ni-C x-y , x and y are annealing temperature and time, respectively) is synthesized via high temperature pyrolysis and air annealing treatment. Redox reaction between carbon atoms and nickel ions during synthesis could achieve a high-level graphitization, which greatly enhances the corrosion resistance of catalyst in alkaline solution. The overpotential at 10 mA cm −2 and Tafel slope of Ni-C 500-20 achieve 353 mV and 97 mV dec –1 , respectively. Increased defects and intrinsic activity induced by air annealing process and synergistic effect between carbon, Ni and NiO give rise to the enhanced OER performance of as-prepared catalyst, as confirmed by in-situ Raman spectra. The catalyst conforms to sustainable and economic development concept, being a potential material for OER.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）