Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Solution Plasma Synthesis of BNC Nanocarbon for Oxygen Reduction Reaction

  • Lee, Seung-Hyo (Graduate School of Materials Engineering, Nagoya University)
  • Received : 2018.10.16
  • Accepted : 2018.10.29
  • Published : 2018.10.31
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Abstract

Alkaline oxygen electrocatalysis, targeting anion exchange membrane alkaline-based metal-air batteries has become a subject of intensive investigation because of its advantages compared to its acidic counterparts in reaction kinetics and materials stability. However, significant breakthroughs in the design and synthesis of efficient oxygen reduction catalysts from earth-abundant elements instead of precious metals in alkaline media still remain in high demand. One of the most inexpensive alternatives is carbonaceous materials, which have attracted extensive attention either as catalyst supports or as metal-free cathode catalysts for oxygen reduction. Also, carbon composite materials have been recognized as the most promising because of their reasonable balance between catalytic activity, durability, and cost. In particular, heteroatom (e.g., N, B, S or P) doping on carbon materials can tune the electronic and geometric properties of carbon, providing more active sites and enhancing the interaction between carbon structure and active sites. Here, we focused on boron and nitrogen doped nanocarbon composit (BNC nanocarbon) catalysts synthesized by a solution plasma process using the simple precursor of pyridine and boric acid without further annealing process. Additionally, guidance for rational design and synthesis of alkaline ORR catalysts with improved activity is also presented.

Keywords

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Fig. 1. Schematic illustration of the experimental setup for solution plasma synthesis

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Fig. 2 (a) Wide-field TEM images of BNNC-20 (b) High-resolution TEM image of BNNC-20 (c) STEM image of BNNC-20 and the distribution maps for B, C and N elements.

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Fig. 5. CV curves of BNNC-20 in N2 (red dashed line) and O2-saturated (black solid line) 0.1 M KOH solution at a scan rate of 50 mVs-1.

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Fig. 6. CV curves of NNNC and BNNC-20 in O2- saturated 0.1 M KOH solution at a scan rate of 50 mVs-1.

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Fig. 7. LSV curves of NNC, BNNC-20 and 20% Pt/C in 0.1 M KOH solution at a rotation speed of 1600 rpm and a scan rate of 10 mVs-1.

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Fig. 3 XPS spectra of BNNC-20 and NNC.

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Fig. 4 FT-IR spectra of BNNC-20 and NNC.

Table 1. The mass concentration of different atomes in NNC and BNNC-20

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