A simple electrodeposition technique was used to prepare Ni-CeOnanorods composite coating(Ni-CeONRs) using Watt’s nickel plating bath containing CeOnanorods(NRs) as the reinforcement phase under optimized process con...A simple electrodeposition technique was used to prepare Ni-CeOnanorods composite coating(Ni-CeONRs) using Watt’s nickel plating bath containing CeOnanorods(NRs) as the reinforcement phase under optimized process conditions. The X-ray diffraction analysis(XRD) was used for the structural analysis of Ni-CeONRs composite coatings and their average crystalline size is ～22 nm for pure Ni and ～18 nm,respectively. The crystalline structure is fcc for the Ni-CeOnanocomposite coatings. The surface morphology of the electrodeposited Ni-CeONRs composite coatings was analyzed by scanning electron microscopy(SEM). Microhardness of pure Ni and Ni-CeONRs composite coatings are found to be 253 HV and 824 HV, respectively. The inclusion of CeONRs increases the microhardness of Ni-CeONRs composite coatings. The corrosion resistance behavior of Ni-CeONRs composite coating was evaluated by Tafel polarization and AC impedance methods. It is revealed that CeONRs reinforced Ni matrix shows higher microhardness and corrosion resistance than existing reported electrodeposited pure Ni and CeOnanoparticles reinforced Ni coatings.展开更多
Redox activity of copper species immobilized poly(o-aminophenol)/multi-walled carbon nanotube(Cu@MWCNT-POAP)composite is reported for direct electrocatalysis towards detection of H_(2)O_(2).The Cu@MWCNT-POAP composite...Redox activity of copper species immobilized poly(o-aminophenol)/multi-walled carbon nanotube(Cu@MWCNT-POAP)composite is reported for direct electrocatalysis towards detection of H_(2)O_(2).The Cu@MWCNT-POAP composite was prepared by a single step in situ electrochemical method.The as-prepared Cu@MWCNT-POAP composites were characterized by field emission scanning electron microscopy,Fourier transform infrared spectroscopy,Raman spectroscopy,X-ray diffraction,and electrochemical impedance spectroscopy.Cyclic voltammetry(CV)studies highlighted the good redox behavior of the Cu@MWCNT-POAP composite resulting from direct electron transfer behavior of the copper redox couple(Cu^(2+)/Cu^(+)).The Cu@MWCNT-POAP composite displayed superior electrocatalytic activity and high performance towards detection of H_(2)O_(2)because of its large surface area and homogenous immobilization of Cu species on the MWCNT-POAP composite.The analytical sensitivity and detection limit of the sensor were 831μA mM^(-1)cm^(-2)and 30 nM,respectively.In addition,bio-catalytic activity of the sensor was evaluated using the Michaelis-Menten constant.The Cu@MWCNT-POAP composite showed excellent stability and reproducibility,and good recoveries for determination of H_(2)O_(2)in milk,bleach cream,and contact lens solutions.展开更多
基金Project supported by UGC-DAE Consortium for Scientific Research,Indore-452 017,India(CSR-KN/CRS-47/2013-14/647)
文摘A simple electrodeposition technique was used to prepare Ni-CeOnanorods composite coating(Ni-CeONRs) using Watt’s nickel plating bath containing CeOnanorods(NRs) as the reinforcement phase under optimized process conditions. The X-ray diffraction analysis(XRD) was used for the structural analysis of Ni-CeONRs composite coatings and their average crystalline size is ～22 nm for pure Ni and ～18 nm,respectively. The crystalline structure is fcc for the Ni-CeOnanocomposite coatings. The surface morphology of the electrodeposited Ni-CeONRs composite coatings was analyzed by scanning electron microscopy(SEM). Microhardness of pure Ni and Ni-CeONRs composite coatings are found to be 253 HV and 824 HV, respectively. The inclusion of CeONRs increases the microhardness of Ni-CeONRs composite coatings. The corrosion resistance behavior of Ni-CeONRs composite coating was evaluated by Tafel polarization and AC impedance methods. It is revealed that CeONRs reinforced Ni matrix shows higher microhardness and corrosion resistance than existing reported electrodeposited pure Ni and CeOnanoparticles reinforced Ni coatings.
基金supported by the National Science Council and the Ministry of Education of Taiwan(Republic of China).
文摘Redox activity of copper species immobilized poly(o-aminophenol)/multi-walled carbon nanotube(Cu@MWCNT-POAP)composite is reported for direct electrocatalysis towards detection of H_(2)O_(2).The Cu@MWCNT-POAP composite was prepared by a single step in situ electrochemical method.The as-prepared Cu@MWCNT-POAP composites were characterized by field emission scanning electron microscopy,Fourier transform infrared spectroscopy,Raman spectroscopy,X-ray diffraction,and electrochemical impedance spectroscopy.Cyclic voltammetry(CV)studies highlighted the good redox behavior of the Cu@MWCNT-POAP composite resulting from direct electron transfer behavior of the copper redox couple(Cu^(2+)/Cu^(+)).The Cu@MWCNT-POAP composite displayed superior electrocatalytic activity and high performance towards detection of H_(2)O_(2)because of its large surface area and homogenous immobilization of Cu species on the MWCNT-POAP composite.The analytical sensitivity and detection limit of the sensor were 831μA mM^(-1)cm^(-2)and 30 nM,respectively.In addition,bio-catalytic activity of the sensor was evaluated using the Michaelis-Menten constant.The Cu@MWCNT-POAP composite showed excellent stability and reproducibility,and good recoveries for determination of H_(2)O_(2)in milk,bleach cream,and contact lens solutions.
