Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Performance of BDD Electrodes Prepared on Various Substrates for Wastewater Treatment

다양한 기판에 형성된 BDD 전극의 폐수처리 특성

  • Kwon, Jong-Ik (School of Materials Science and Engineering, Pusan National University) ;
  • You, Mi-Young (Department of Materials Science and Engineering, Pusan National University) ;
  • Kim, Seo-Han (Department of Materials Science and Engineering, Pusan National University) ;
  • Song, Pung-Keun (Department of Materials Science and Engineering, Pusan National University)
  • Received : 2019.01.30
  • Accepted : 2019.03.21
  • Published : 2019.04.30
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Abstract

Stability and activity of boron doped diamond (BDD) electrode are key factors for water treatment. In this study, BDD electrodes were prepared on various substrates such as Nb, Si, Ti, and $TiN_x/Ti$ by hot filament chemical vapor deposition (HFCVD) method. BDD/Ti film showed the delamination between BDD and Ti substrate due to the formation of TiC layer caused by diffusion of carbon. On the other hand, $BDD/TiN_x/Ti$ showed remarkably improved stability, compared to BDD/Ti. It was confirmed that $TiN_x$ intermediate layer act as barrier layer for diffusion of carbon. High potential window of 2.8 eV was maintained on the $BDD/TiN_x/Ti$ electrode and, better wastewater treatment capability and longer electrode working life than BDD/Nb, BDD/Si and BDD/Ti were obtained.

Keywords

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Fig. 1. FE-SEM images of BDD deposited on different substrates with and without TiNx interlayer: (a) BDD/Nb, (b) BDD/Si, (c) BDD/TiNx/Ti, (d) BDD/Ti.

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Fig. 2. XRD patterns of BDD films deposited on different substrates with and without TiNx interlayer: (a) BDD/Nb, (b) BDD/Si, (c) BDD/TiNx/Ti, (d) BDD/Ti.

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Fig. 3. FE-SEM images of the surface (a) and cross section (b) of TiNx deposited on Ti substrate.

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Fig. 4. Cyclic voltammograms of BDD films deposited on different substrates with and without TiNx interlayer: (a) BDD/Nb, (b) BDD/Si, (c) BDD/TiNx/Ti, (d) BDD/Ti.

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Fig. 5. COD (a) and colon bacillus (b) with sterilization time using BDD electrodes prepared on various substrates of Nb, Si, TiNx/Ti and Ti.

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Fig. 6. Cyclic voltammograms of BDD/Nb and BDD/TiNx/Ti electrodes up to 1000cycles.

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