JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 21
·期 10
·2887-2898
·
IF 2.316
Ouyang Ruizhuo,Zong Tianyu,Su Yongfu,Jia Pengpeng,Zhou Shuang,Yang Yang,Feng Kai,Chang Haizhou,Chen Ying,Zhao Yuefeng,Xiong Fei,Miao Yuqing
A new type of Ni 2+ -loaded MWCNT composite was prepared by mixing carboxylated multiwalled carbon nanotubes (MWCNTs) and Ni 2+ ions and allowing them to interact electrostatically. The resulting composite was subsequently used as an electrocatalyst for glucose (Glu) oxidation. Compared with electrodes modified through the addition of free Ni 2+ ions or MWCNTs, the Ni 2+ /MWCNT composite electrode showed greatly improved properties such as hydrophilicity. Investigations of the Ni 2+ /MWCNT composite electrode via inductively coupled plasma atomic emission spectroscopy and nitrogen adsorption–desorption isotherms verified that Ni 2+ ions had been adsorbed onto the surfaces of the MWCNTs in the composite. As expected, a Ni 2+ /MWCNT composite-based sensor showed extraordinary electrocatalytic performance in Glu oxidation. In the concentration range 0–4.3 mM, a good linear relationship between the Glu added and the current generated was observed, with a correlation coefficient ( R
2 ) of 0.9988. The detection limit and sensitivity were calculated to be 0.081 μM and 2285 μA mM −1 cm −2 , respectively. Finally, the new method was successfully applied to determine the Glu in a human blood sample. Recoveries of >100%, indicative of high reliability, accuracy, and precision, were obtained.
研究领域:
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Silicon
·
2020
·Vol. 14
·期 2
·385-392
·
IF 1.499
Wen Qin,Jiang Chunxia,Liu Wanqiang,Zeng Zhi,Gao Jinwei,Zheng Yuhui
Quantum dots generate unique luminescent and chemical properties due to the ultra-small particle sizes. In this contribution, a novel silicon nanoparticles (Si-NPs)-based platform has been established via (3-aminopropyl) trimethoxysilane (APS) and ascorbic acid (AA) as raw materials within only 30 min. A switched off effect has been achieved for the determination of Ni 2+ ions and the strategy has been simply realized by recording the luminescence changes in the green band of Si-NPs. This developed approach possesses a variety of merits such as label free, low cost, easy post-treatment and convenient operations. The linear equation range is yielded between 0 and 20 μM with the detection limit of 1.73 μM. The nano-sensor provides a versatile route for the monitoring of mercury ions in practical environments.
研究领域:
分析化学
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2022
·Vol. 7
·期 11
·2200320
·
IF 8.856
Shihai Miao,Yanjie Liang,Yan Zhang,Dongxun Chen,Xiao-Jun Wang
Blue light-emitting diode (LED) pumped short-wave infrared (SWIR; 900–1700 nm) emitters are providing new solutions in the design of portable and cost-effective infrared light sources for medical, surveillance, and spectroscopy applications by taking advantage of converter technology. However, desirable blue-light-excitable SWIR-emitting phosphors with a peak wavelength longer than 1000 nm are lacking. Herein, a promising broadband SWIR phosphor is designed and developed by incorporating Cr 3+ -Ni 2+ ion pairs into LiMgPO 4 host. Upon 450 nm blue light excitation, the as-synthesized LiMgPO 4 :Cr 3+ ,Ni 2+ phosphor exhibits a broad and intense SWIR emission spanning from 1100–1600 nm with peak wavelength at 1380 nm and a full width at half maximum of 273 nm due to the efficient energy transfer from Cr 3+ to Ni 2+ . Moreover, phosphor-converted SWIR LED prototype device based on the combination of 450 nm blue LED chip and the optimized phosphor is fabricated as a new type of broadband illuminator covering the SWIR waveband, delivering a maximum radiant power of ≈2.7 mW at 120 mA driving current. Benefiting from the distinct spectral characteristics of SWIR light, the practical relevance of the fabricated SWIR illuminator is demonstrated in covert information identification and night vision lighting.
研究领域:
材料科学
·
光学工程
·
光电子技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Ying Liu,Pu Liu,Wei Qin,Xiaoju Wu,Guowei Yang
To explore the surface state of electrocatalysts , herein we developed a surface laser modification (pulsed laser ablation , PLA) approach for the fabrication of NiCo 2 O 4-δ with substantial inner oxygen vacancies (Vo ·· ) and higher exterior Ni 3+ /Ni 2+ ratio. The separated NiCo 2 O 4 nanoplates were transformed to cross-linked NiCo 2 O 4-δ nanostructure through PLA strategy. As compare with the primordial NiCo 2 O 4 produce, the laser-modificated NiCo 2 O 4-δ exhibits higher capacitance, lower overpotential and better electrocatalytic performance. The first-principles calculation proves that the additional energy level is introduced between the valence band and conduction band of L-NiCo 2 O 4-δ . The additional energy level not only benefits the hopping of electrons, but also inhibits the recombination of electron-hole pairs. The X-ray photoelectron spectrum (XPS) confirms that the active sites of the electrocatalytic reaction are Vo ·· , suggesting that the electron structure of catalyst could be adjusted by PLA. The high electrocatalytic activity of laser-modificated NiCo 2 O 4-δ could be ascribed to the synergistic effect of increased number of inner Vo ·· , higher electrochemically active surface area , and dominated Ni oct . Our findings might inspire new thoughts on the tuning the surface state and electronic structure of electrocatalyst.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
BIOORGANIC CHEMISTRY
·
2021
·
IF 5.275
Yingying Zhang,Yanliang Zhao,Bo Song,Kunming Liu,Jiamin Gu,Yiying Yue,Ranhua Xiong,Chaobo Huang
Fluorescence probe combines with fluorescence imaging technology has become the most powerful analytical method with their great advantages of high sensitivity and selectivity and real-time monitoring. Ni 2+ is widely distributed in food, environment and living animals, thereof, it is of great significance for detection Ni 2+ with high selectivity. Herein, a simple strategy is proposed to design and synthesiz a small molecule fluorescent probe Y1 by using “one-pot” method. The spectroscopic behaviors including UV–Vis absorption and fluorescence emission spectrum have been used to verify the feasibility of probe towards Ni 2+ in water/EtOH ( v / v = 2:8) mixtures under neutral condition. As expected, Y1 offers high selectivity and sensitivity for detection Ni 2+ in aqueous solution with a good linear relationship and low detection limit within Ni 2+ concentration variation from 0 to 13 μM ( DOL = 0.0038 μM, R 2 = 0.9983). It is remarkable that Y1 can be applied for real-time visualization Ni 2+ change in sprouted potato and zebrafish with great photo-stability, highlighting that the practicability and feasibility of Y1 to detect and monitor Ni 2+ in the field of food industry and biomedical field.
研究领域:
分析化学
·
生物医学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 2
·1395-1403
·
IF 2.599
Yi Mengji,Liu Yuefeng,Gao Huiping,Huang Zhangyu,Liang Jiwei,Mao Yanli
In this manuscript, Ni 2+ ions-doped NaYF 4 :Yb 3+ /Er 3+ nanoparticles have been synthesized via a modified hydrothermal method. The upconversion luminescence intensities of the green (G) and red (R) emission of NaYF 4 :Yb 3+ /Er 3+ co-doped with 20 mol% Ni 2+ ions are the strongest which increase 32.84 and 20.99 times than that without doping Ni 2+ , respectively. In addition, the R/G ratio decreases with the concentration of Ni 2+ increasing from 0 to 40 mol%. The underlying reason for luminescence enhanced and the R/G ratio decreased by Ni 2+ doping is explored by a series of controlled experiments, and the mechanism based on the crystal field asymmetry, different substitution by Ni 2+ , the energy transition of Er 3+ is studied in detail. The study indicates that the misshapen crystal field plays an important role in enhancement fluorescence emission, and several factors affect the R/G ratio including the crystal field, the substitution site and the energy transition. Our result may play a certain function for study and design of high-performance upconversion materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Energy Materials
·
2024
·Vol. 4
·期 6
·N
·
IF 11.8
Jingyao Cai,Yanbing Zhu,Zhiguo Zhang,Jiandong Zhang,Liyuan Tian,Pengkun Gao,Yali Zhang,Mingkui Wang,Yan Shen
The feature of high theoretical capacity, long thermal stability, and low-cost fabrication offers the layered transition metal oxide NaCrO2 as an excellent candidate for sodium-ion batteries. Here, we show an effective method for electronic modulation of NaCrO2 by partial substitution of Cr3+ with low-valent Ni2+ to produce NaCr0.95Ni0.05O2 as an efficient cathode for these batteries. We found that Ni2+ substitution plays a critical role in the ionic character of transition metal-oxygen bonds, which increases the interlayer separation and thus improves sodium-ion diffusion kinetics. Furthermore, Ni2+ substitution reduces the deterioration of NaCrO2 throughout charge-discharge processes and thus boosts the cycle performance of the materials. The resultant NaCr0.95Ni0.05O2 cathode displays a remarkable rate performance with specific capacities of 91.2 mAh g-1 at 50 C and a high retention (~80%) of the initial capacity after cycling for 1,000 cycles at 10 C.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 15
·4711-4720
·
IF 6.1
Zhexuan Gao,Yi Zhang,Yinyan Li,Shilong Zhao,Peng Zhang,Xiaolong Dong,Degang Deng,Shiqing Xu
The second near-infrared window (NIR-II, 1000–1700 nm) emitting phosphor is a key component for the phosphor-converted light-emitting diode (pc-LED), which has garnered significant attention. However, it remains a major challenge to discover efficient NIR-II broadband phosphors that can be excited by blue LEDs. Herein, Cr3+ and Ni2+ ions were co-doped into the Li2ZnSn3O8 (LZSO) host. LZSO:Cr3+,Ni2+ phosphor achieves a broadband NIR-II emission peak at 1465 nm with a large full width at half maximum (FWHM) of 300 nm and internal quantum efficiency (IQE) of 43.31% under excitation at 426 nm because of the efficient energy transfer (ET) from Cr3+ to Ni2+. In addition, a dual-emissive doped phosphor across the NIR-I (700–1000 nm) and NIR-II regions with a higher sensitivity at physiological temperatures was obtained. The relative sensitivity value (Sr) reaches 1.44% K−1 at 293 K, indicating that the LZSO:Cr3+,Ni2+ phosphor is a potential candidate for NIR optical thermometers in biotechnological applications. The manufactured NIR-II pc LED provides a radiative flux of 8.26 mW with a photoelectric conversion efficiency of 2.71% at a drive current of 100 mA and has promising potential in night vision, medical imaging, and spectral analysis applications.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 13
·134003
·
IF 3.551
Yuantao Pei,Liqiong Wang,Liang Huang,Yuetong Hu,Quanli Jia,Haijun Zhang,Shaowei Zhang
ISOBAM-104-stabilized Ni2+ colloidal catalysts were synthesized through a facile method and used for hydrogen generation from hydrolysis of potassium borohydride (KBH4). Ni nanoparticles (NPs) were formed as the active phase during the catalytic process. Ultraviolet–visible spectrophotometry (UV–vis) and transmission electron microscopy were employed to characterize the structure and particle size of the as-formed Ni NPs. The results suggested that the catalytic activity of Ni2+ colloidal catalyst increased with the decreased size of as-formed Ni NPs, which is consistent with the results of density functional theory calculation. The highest catalytic activity of the catalyst can be 12400 ml-H2 min−1 g-Ni−1, which was even higher than that of noble Pt or Pd colloidal catalysts prepared using identical methods and catalytic conditions. According to the Arrhenius method, the ISOBAM-104-stabilized Ni2+ colloidal catalysts showed low activation energies of about 41.3 kJ mol−1 for the hydrogen generation from hydrolysis basic KBH4 solution.
研究领域:
化学
·
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Dazhong Zhong,Dong Wang,Tan Li,Lu Hao,Zizai Ma,Tao Zhao,Genyan Hao,Xiaoguang Wang,Guang Liu,Jinping Li,Qiang Zhao
NiFe-layered double hydroxide (NiFe–OH) is one of the most promising candidate materials for the oxygen evolution reaction (OER) in an alkaline electrolyte . However, it is difficult to be oxidized into Ni 3+ FeOOH active species with high valence Ni under mild conditions; thus, the activity under mild conditions is inferior. We report here that NiFe–OH is converted to amorphous NiFeO x H y (a3-NiFe-OH) with easily oxidized electron-deficient Ni 2+ after pre-oxidation in an alkaline solution boosts the OER performance under mild conditions. The amorphous structure of a3-NiFe-OH also enlarges the electrochemically active area to expose more active sites. It merely needs an overpotential of 350 mV at 10 mA cm −2 in 0.1 M KHCO 3 electrolyte. The corresponding Tafel slope is as low as 89 mV dec −1 . This work affords a strategy for developing (near) neutral OER catalysts.
研究领域:
电化学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Guanliang Yu,Weirong Wang,Chun Jiang
Adjusted crystal fields can lead to new hybrid materials with promising optical performance. Transition metal ions (TMIs) with d-d electron transitions are sensitive to their surroundings and can be ideal candidates for crystal field research. Herein, we have selected single Ni 2+ -doped spinel oxide nanocrystals as a model system to systematically explore luminescence mechanisms in different crystal fields. Ni 2+ -doped ZnAl 2 O 4 , ZnGa 2 O 4 , and ZnCr 2 O 4 nanospinels with broad near-infrared (NIR) emission bands fully cover the second biological window (1100–1400 nm). We have developed a ZnX 2 O 4 (X = Al, Ga or Cr) (ZXO) spinel framework system using a melting-evaporation procedure, and the whole fabrication period only required 20 min. By changing X ions in the ZXO matrix framework, linear tunable photoluminescence was successfully realized. A sample with a mixed phase of ZnAl 2 O 4 and ZnCr 2 O 4 (ZACO) was also prepared using the same method, and ultrabroadband emissions ranging from 1050-1550 nm were detected. It is valuable to further explore the combinations based on these frameworks to realize tunable emission spectra. Fundamental research on the physical processes will open a new gateway for further research of TMI-doped nanocrystals with promising luminescence properties and broaden the applications to a variety of areas, especially in the biomedical field.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 48
·18234-18240
·
IF 8.067
Chuan-Jun Tang,Bo-Mei Liu,Lin Huang,Jing Wang,Qiang Tang
The rapid development of minimized near-infrared (NIR) phosphor-converted LEDs (pc-LEDs) has evoked a large demand for broadband NIR phosphors and will enable breakthrough NIR spectroscopy applications. Consequently, the search for NIR pc-LEDs which can emit in the NIR-II window (1000–1700 nm) has become increasingly urgent. Herein, an unprecedented long-wavelength NIR MgTi2O5:Ni2+ phosphor that exhibits broadband NIR emission covering 1200 to 1700 nm with a full width at half maximum (FWHM) of 245 nm is successfully synthesized. By combining the MgTi2O5:Ni2+ phosphor with an ultraviolet LED chip, a high-performance NIR pc-LED is fabricated, which has a NIR output power of 3.6 mW at 300 mA driving current. These results indicate that the fabricated NIR-II pc-LED device is a promising candidate as a broadband light source for NIR spectroscopy applications including night vision, high-penetrating imaging, and information restoration. For instance, the secret information covered by ink can be recovered with the aid of an NIR-II pc-LED. This work not only provides a new material that has great potential as a NIR light source, but also demonstrates a set of approaches to expand the application of NIR spectroscopy and imaging technology.
研究领域:
材料科学
·
光学工程
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）