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CeO2-modified LaNi0.6Fe0.4O3 perovskite and MWCNT nanocomposite for electrocatalytic oxidation and detection of urea

Tran, Thao Quynh Ngan,Yoon, Suk Won,Park, Bang Ju,Yoon, Hyon Hee Elsevier 2018 Journal of Electroanalytical Chemistry Vol.818 No.-
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Abstract A perovskite-type oxide (LaNi0.6Fe0.4O3-CeO2, LNF-C) and multiwalled carbon nanotube (MWCNT) composite was employed as a novel catalyst material for the electrochemical oxidation of urea in an amperometric urea sensor. The structural and morphological properties of the LNF-C/MWCNT nanocomposite were studied by X-ray diffraction and scanning electron microscopy. The Ni-based pervoskite exhibited higher electrocatalytic activity than a single NiO compound, and CeO2 further improved the activity and stability. The reaction of urea electrooxidation on LNF-C occurred via 6-electrons, and was a half-order reaction with respect to urea concentrations in alkaline solution, as observed by cyclic voltammetry studies. The LNF-C/MWCNT modified electrodes exhibited a sensitivity of 195.6 μAmM−1 cm−2 in a linear range from 25 to 670 μM of urea with a low detection limit (1 μM), fast response time (5 s), and good stability. In addition, the urea sensor demonstrated feasibility for urea analysis in real urine samples. The results indicated that the LNF-C/MWCNT composite could be used as an effient catalyst for the electro-oxidation of urea and electrode material for non-enzymatic urea sensors. Highlights <UL> <LI> A perovskite-type oxide (LaNi0.6Fe0.4O3-CeO2) and MWCNT composite was proposed as urea electro-oxidation catalyst. </LI> <LI> The Ni-based pervoskite exhibited higher electrocatalytic activity than a single NiO compound. </LI> <LI> The presence of CeO2 considerably improved the activity and stability. </LI> <LI> The composite electrode exhibited an excellent performance in urea detection. </LI> </UL>
2
Ni Nanoparticles Supported on MIL-101 as a Potential Catalyst for Urea Oxidation in Direct Urea Fuel Cells

Ngan Thao Quynh Tran,Hyo Sun Gil,Gautam Das,Bo Hyun Kim,Hyon Hee Yoon 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.3
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framework, MIL-101, particles. The morphology, structure, and composition of as synthesized Ni@MIL- 101 catalysts were characterized by X-Ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy. The electro-catalytic activity of the Ni@MIL-101catalysts towards urea oxidation was investigated using cyclic voltammetry. It was found that the structure of Ni@MIL-101 retained that of the parent MIL-101, featuring a high BET surface area of 916 m2 g-1, and thus excellent electro-catalytic activity for urea oxidation. A urea/H2O2 fuel cell with Ni@MIL-101 as anode material exhibited an excellent performance with maximum power density of 8.7 mWcm-2 with an open circuit voltage of 0.7 V. Thus, this work shows that the highly porous three-dimensional Ni@MIL-101 catalysts can be used for urea oxidation and as an efficient anode material for urea fuel cells.
3
AgNi@ZnO nanorods grown on graphene as an anodic catalyst for direct glucose fuel cells

Thoa Thi Kim Huynh,Thao Quynh Ngan Tran,윤현희,김우재,김일태 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.7
Nano carbon-semiconductor hybrid materials such as graphene and zinc oxide (ZnO) have been vigorously explored for their direct electron transfer properties and high specific surface areas. We fabricated a three-dimensional anodic electrode catalyst nanostructure for a direct glucose fuel cell (DGFC) utilizing two-dimensional monolayer graphene and one-dimensional ZnO nanorods, which accommodate silver/nickel (Ag/Ni) nanoparticle catalyst. Glucose, as an unlimited and safe natural energy resource, has become the most popular fuel for energy storage. Ag and Ni nanoparticles, having superior catalytic activities and anti-poisoning effect, respectively, demonstrate a 73-times enhanced cell performance (550 W cm2 or 8mW mg1) when deposited on zinc oxide nanorods with a small amount of ~0.069 mg in 0.5M of glucose and 1M of KOH solution at 60 oC. This three-dimensional anodic electrode catalyst nanostructure presents promise to open up a new generation of fuel cells with non-Pt, low mass loading of catalyst, and 3D nanostructure electrodes for high electrochemical performances.