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Direct Synthesis of Pure H2O2 Aqueous Solution by CoTPP/Ketjen-Black Electrocatalyst and the Fuel Cell Reactor

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Abstract

Hydrogen peroxide as an important and green oxidant for chemical process is manufactured by the anthraquinone (AQ) process, which is an indirect synthesis method and consumes a large quantity of energy. We have reported the direct and efficient synthesis of pure H2O2 aqueous solutions by O2 and H2 fuel-cell reactions using the Co-N-C compound cathode. Catalysis of Co-N-C-compound was improved in this work. Precursors of Co-N-C compounds were prepared by impregnation of 5,10,15,20-tetrakis(phenyl)-21H, 23H-porphyrin cobalt (II) (CoTPP) on various carbon materials. Effects of carbon materials, heat-treatment temperatures, Co loadings of the precursors on the electrocatalysis for H2O2 synthesis were studied from a current density (j), a H2O2 formation rate (R(H2O2)), a H2O2 concentration (C(H2O2)) and a faradic efficiency for H2O2 formation (FE(H2O2)). The most active and effective Co-N-C electrocatalyst is Ketjen-Black supported CoTPP (0.05 Co-wt%) activated at 1023 K in He stream as denoted 0.05 wt%/CoTPP/KB(1023 K) and shows a highest C(H2O2) and FE(H2O2) of 5.5 mol dm−3 (18.7 wt%) and 55%, respectively, with a high Co turnover-frequency of 26 s−1. Effects of amounts of the 0.05 wt%/CoTPP/KB(1023 K) electrocatalyst coated on the VGCF-base cathode were studied on the H2O2 synthesis and distributions of open-circuit voltages as electromotive forces to cathode and anode over-potentials and an IR-drop (VGCF: vapor-growing carbon fiber).

The 0.05wt%/CoTPP/KB(1023K) electrocatalyst was active for reduction of O2 to pure H2O2 aqueous solutions 5.5 mol dm–3 and 55 % faradic efficiency (CoTPP: 5, 10, 15, 20-tetrakis(phenyl)-21H, 23H-porphyrin cobalt (II), KB: Ketjen-Black)

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Authors and Affiliations

  1. Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan

    Tatsuya Iwasaki, Yukako Masuda, Hitoshoi Ogihara & Ichiro Yamanaka

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  1. Tatsuya Iwasaki
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  2. Yukako Masuda
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  3. Hitoshoi Ogihara
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  4. Ichiro Yamanaka
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Correspondence to Ichiro Yamanaka.

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Iwasaki, T., Masuda, Y., Ogihara, H. et al. Direct Synthesis of Pure H2O2 Aqueous Solution by CoTPP/Ketjen-Black Electrocatalyst and the Fuel Cell Reactor. Electrocatalysis 9, 236–242 (2018). https://doi.org/10.1007/s12678-017-0444-0

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  • DOI: https://doi.org/10.1007/s12678-017-0444-0

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