Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Ni Nanoparticles Supported on MIL-101 as a Potential Catalyst for Urea Oxidation in Direct Urea Fuel Cells

  • Tran, Ngan Thao Quynh (Department of machine and Equipment, Industrial University of Ho Chi Minh City) ;
  • Gil, Hyo Sun (Department of Chemical and Bio Engineering, Gachon University) ;
  • Das, Gautam (Department of Chemical and Bio Engineering, Gachon University) ;
  • Kim, Bo Hyun (Department of Chemical and Bio Engineering, Gachon University) ;
  • Yoon, Hyon Hee (Department of Chemical and Bio Engineering, Gachon University)
  • Received : 2019.01.21
  • Accepted : 2019.03.28
  • Published : 2019.06.01
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Abstract

A highly porous Ni@MIL-101catalyst for urea oxidation was synthesized by anchoring Ni into a Cr-based metal-organic 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 $916m^2g^{-1}$, and thus excellent electro-catalytic activity for urea oxidation. A $urea/H_2O_2$ fuel cell with Ni@MIL-101 as anode material exhibited an excellent performance with maximum power density of $8.7mWcm^{-2}$ 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.

Keywords

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Fig. 1. XRD patterns (a) and Raman spectra (b) of MIL-101 and Ni@MIL-101.

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Fig. 2. SEM (a), cross-sectional FIB-SEM (b), TEM (c) images, and (d) EDX spectrum of as synthesized Ni@MIL-101 particles.

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Fig. 3. N2 sorption isotherm (a), and pore size distribution (b) of MIL-101 and Ni@MIL-101.

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Fig. 4. (a) CV curves of Ni@MIL-101 recorded in the absence (black) and presence of 0.1 M urea (red) in 0.1 M KOH at scan rate of 10 mV s-1, and (b) chronoamperometric responses of MIL-101, and Ni@MIL-101 in 0.1 M urea in 0.1 M KOH at 0.6 V.

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Fig. 5. I-V and power density curves of a urea/H2O2 cell with Ni@ MIL-101 as anode at 0.3 M urea in 1 M KOH at 70 ℃.

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