DALTON TRANSACTIONS
·
2016
·Vol. 46
·期 2
·554-563
·
IF 4.177
Erbin Shi,Huiming Lin,Qian Wang,Feng Zhang,Shaoxuan Shi,Tingting Zhang,Xin Li,Hao Niu,Fengyu Qu
A novel ZIF-Ni composite film has been successfully prepared by a facile method involving the in situ deposition of ZIF-8 on a nickel porous film which is fabricated by selectively etching copper from a dense Ni/Cu alloy film. The nanostructures of the resulting ZIF-Ni composite films are carefully examined by a combination of scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, Fourier transform infrared (FT-IR) spectroscopy, energy dispersive X-ray (EDX), and nitrogen adsorption–desorption. Cyclic voltammetric and amperometric studies show the enhanced electrocatalytic properties of the ZIF-Ni composite film electrodes toward hydrazine oxidation relative to the synergistic effect of ZIF-8 and porous Ni films. The application potential of the composite films as amperometric detectors is explored for the determination of hydrazine. A high sensitivity of 805.5 μA mM−1 for hydrazine detection with a low detection limit of 0.021 μM (S/N = 3) and a wide linear range from 2.5 μM to 28 mM are revealed for this new type of composite film as the detecting electrode. Moreover, the composite films exhibit excellent selectivity and remarkable stability for the oxidation of hydrazine. This can offer new opportunities for the fast and selective detection of hydrazine and provide a promising platform for sensor designs for hydrazine detection.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Lu Zhang,Guijiu Xie,Fuyi Liu,Huiming Ji
Hydrogen sensors are very important for real-time detection of hydrogen leakage. In this study, a Pd-Ni film hydrogen sensor with high hydrogen response and selectivity was fabricated. A 1.3 µm-thick organosilica membrane was coated on the surface of Pd-Ni alloy film by sol-gel process and hot-coating method to fabricate a 1,2-bis(triethoxysilyl)methane (BTESM)-coated Pd-Ni film hydrogen sensor, which endows the sensor with superior H 2 selectivity due to the molecular sieve property. And the gas sensing performance was tested at optimum operating temperature. The results show higher response is obtained in both N 2 and air atmosphere by hybrid organosilica membrane modification on the Pd-Ni film sensor. Very importantly, the response of the sensor to hydrogen is greatly improved and well maintained in the presence of oxygen, although the response/recovery time increased. The organosilica membrane has high permeability to hydrogen with the kinetic dimater of 0.289 nm while effectively inhibits the permeation of relatively larger gas molecule such as oxygen (0.34 nm) and methanol (0.38 nm), resulting in excellent selectivity to H 2 . The mechanism of response and selectivity enhancement is explored.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Liping Li,Wanhui Shi,Sheng Zhu,Yunzhen Chang,Wenjing Hou,Ying Zhang,Hongfei Wang,Gaoyi Han
Developing strain sensors with metal film as sensing material is effective route in monitoring human physiological signals. However, most of them exhibits narrow stretchable range, poor detection limit and durability due to the rigidity and low ductility of metal. Here, a wrapping strategy is proposed to fabricate the strain sensor, which employs hydrogel layer to coat conductive Ni film deposited on rubber band to form one-dimensional hierarchical structure. Impressively, the strain sensor achieves a low sensing strain of 0.005 %, high stretchability of 352 % and ultimate strength of 1870 kPa. Fast response time (0.32 s), high gauge factor (GF=33) and low electrical hysteresis are other characteristics of the sensor. It also presents excellent durability and frost-resistance, in which the electrical signals (ΔR/R 0 ) still keep exceedingly steady after 10,000 and 1000 cycles at 25 °C and -30 °C, respectively. As expect, it is sensitive in detecting breathing, pulse wave, facial expression, speech and joint bending signals in real time. This work provides a significant research idea to exploit highly durable and stretchable strain sensors for physiological monitoring.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 41
·12885-12892
·
IF 0
Lian-Kui Wu,Ji-Ming Hu,Jian-Qing Zhang,Chu-Nan Cao
We report a novel silica co-electrodeposition route to prepare highly active nickel films. Firstly, Ni–SiO2 composite film was fabricated on a stainless steel substrate by electrodeposition, and then the SiO2 template was removed in alkaline electrolyte by consecutive cyclic voltammetry scans, leading to the formation of a porous Ni (po-Ni) matrix. The structure and morphology of the obtained films were characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The highly porous property of the po-Ni matrix is believed to be quite favourable for electrochemical applications. The electrochemical properties of the po-Ni film were evaluated by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and steady-state polarization curves. The results showed that the porous Ni derived from the Ni–SiO2 composite film exhibits good electrochemical performance for potential use as a supercapacitor material and catalyst for water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Guoliang Zeng,Danni Ye,Xingfang Zhang,Fengfeng Gao,Xiaogang Hao,Jun Li,Zhong Liu
A nickel hexacyanoferrate (NiHCF) film electrode was prepared with NiHCF, conductive carbon black, and polyvinylidene difluoride, which was coated on graphite plate substrate for selective extraction of Cs + ions by using electrochemically switched ion exchange (ESIX) technology. A potential-responsive ion-pump system for efficient extraction of Cs + ions was designed, and the effect of wet film thicknesses, charging modes, flow rates, and chamber widths on Cs + ions extraction performance was investigated. In the system, the adsorption capacity and removal percentage of Cs + ions on the NiHCF film electrode reached as high as 147.69 mg·g −1 and 92.47%, respectively. Furthermore, the NiHCF film electrode showed high selectivity for Cs + ions and stability. After seven cycles of adsorption/desorption, the desorption percentage could reach about 100%. The excellent Cs + extraction performance should be attributed to the strong driving force produced by the potential-responsive ion-pumping effect in the ESIX process, as well as the low ion transfer resistance of the film electrode which is caused by the special crystal structure of NiHCF. In addition, the NiHCF film electrode was implemented to work together with the bismuth oxybromide (BiOBr) film electrode to accomplish the simultaneous extraction of Cs + and Br – . And the adsorption capacity and removal percentage of Br – ions on the BiOBr film electrode reached 69.53 mg·g −1 and 77.32%, correspondingly. It is expected that such a potential-responsive ion-pump system based on NiHCF and BiOBr film electrodes could be used for the selective extraction and concentration of Cs + and Br – ions from salt lake brine..
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）