Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Synergistic Effect of the MnO Catalyst and Porous Carbon Matrix for High Energy Density Vanadium Redox Flow Battery

고에너지 밀도 바나듐 레독스 흐름 전지를 위한 망간산화물 촉매와 다공성 탄소 기재의 시너지 효과

  • Kim, Minsung (Department of Metallurgical Engineering, Pukyong National University) ;
  • Ko, Minseong (Department of Metallurgical Engineering, Pukyong National University)
  • 김민성 (부경대학교 금속공학과) ;
  • 고민성 (부경대학교 금속공학과)
  • Received : 2019.06.07
  • Accepted : 2019.06.25
  • Published : 2019.06.30
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Abstract

The carbon electrode was modified through manganese-catalyzed hydrogenation method for high energy density vanadium redox flow battery (VRFB). During the catalytic hydrogenation, the manganese oxide deposited at the surface of the carbon electrode stimulated the conversion reaction from carbon to methane gas. This reaction causes the penetration of the manganese and excavates a number of cavities at electrode surface, which increases the electrochemical activity by inducing additional electrochemically active site. The formation of the porous surface was confirmed by the scanning electron microscopy (SEM) images. Finally, the electrochemical performance test of the electrode with the porous surface showed lower polarization and high reversibility in the cathodic reaction compared to the conventional electrode.

Keywords

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Fig. 1. Schematic of process for forming porous surface of carbon electrode

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Fig. 3. Electrode image by EDS(Energy Dispersive Spectrometer) SEM after hydrogenation

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Fig. 6. CV curves at different scan rates: a) Porous Electrode. b) The ratio of the positive and negative peak current density values with different scan rates. Plots of the redox peak current density versus the square root of scan rate for c) Bare & Porous Electrode

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Fig. 2. a) Bare electrode b) Electrodes deposited with a metal precursor through a hydrothermal method c) After the heat treatment of oxygen atmosphere, the electrode deposited with Mn-oxide d) The porous surface electrode formed after hydrogenation

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Fig. 4. a) XRD patterns of each electrode. The each XRD peaks are well coincident with b) The reference data of Mn-σ(ICSD : 98-016-4349), Mn2O3(ICSD : 98-004-3464), MnO(ICSD : 98-016-2039)

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Fig. 5. a) Cyclic voltammetry curves of the carbon felt improved by each process. b) CV curves of the porous electrode with different temperature. c) CV curves of the porous electrode with different time

Table 1. The results of cyclic voltammetry curves of the carbon felt improved by each process

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