Study of Direct Synthesis of Hydrogen Peroxide Acid Solutions at a Heat-Treated MnCl–Porphyrin/Activated Carbon Cathode from H2 and O2
Heat-treated MnCl–porphyrin supported on activated carbon (AC) catalyzed electrochemical reduction of O2 to H2O2 using an H2/O2 fuel cell reactor. Suitable preparation conditions for an Mn–porphyrin electrocatalyst were studied for the H2O2 formation, such as types of porphyrin rings, heat-treatment...
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Published in | Journal of physical chemistry. C Vol. 116; no. 7; pp. 4572 - 4583 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Columbus, OH
American Chemical Society
01.04.2012
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Subjects | |
Online Access | Get full text |
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Summary: | Heat-treated MnCl–porphyrin supported on activated carbon (AC) catalyzed electrochemical reduction of O2 to H2O2 using an H2/O2 fuel cell reactor. Suitable preparation conditions for an Mn–porphyrin electrocatalyst were studied for the H2O2 formation, such as types of porphyrin rings, heat-treatment temperatures in He, and Mn loadings. The effects of reaction conditions, H2SO4 concentration, P(O2), P(H2), and electrolyte flow on the H2O2 formation were studied. Then, 0.5 wt % MnCl–TPP/AC heat treated at 823 K and 0.3 wt % MnCl–OEP/AC heat treated at 723 K showed good electrocatalytic activities for the H2O2 formation (TPP: 5,10,15,20-tetrakis(phenyl)-21H,23H-porphyrin, OEP: 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin). A maximum H2O2 concentration of 1.0 mol dm–3 with 47% current efficiency (CE) was obtained under suitable conditions. The heat-treated MnCl–TPP/AC and MnCl–OEP/AC electrocatalysts were characterized using temperature-programmed desorption, X-ray absorption near-edge structure spectroscopy, elemental analysis, cyclic voltammetry, and rotating ring-disk electrode voltammetry. Elimination of Cl from MnCl–TPP and MnCl–OEP supported on AC was essential to generate an active site for the H2O2 formation. A model of the Mn active site was proposed. |
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ISSN: | 1932-7447 1932-7455 |
DOI: | 10.1021/jp207679e |