Introduction
Electrocatalysis of formic acid (FA) oxidation reactions has been intensively studied for two main reasons: (1) FA is an attractive chemical fuel for fuel cell applications due to its high energy density (1,740 Wh/kg, 2,086 Wh/L) and easy storage [1], and (2) FA is the smallest molecule that has four most common chemical bonds in organic compounds (C−H, C=O, C−O, O−H), making FA an ideal model molecule for studying electrooxidation reactions.
Three possible reaction pathways of FA oxidation have been proposed [2–4]:
- (i)
\( \mathrm{ HCOOH}^*\ \to\ \mathrm{ C}\mathrm{ OOH}^* +\ {{\mathrm{ H}}^{+}}+{e^{-}}\ \to\ \mathrm{ C}{{\mathrm{ O}}_2} +\ 2{{\mathrm{ H}}^{+}} + 2{e^{-}} \)
- (ii)
\( \mathrm{ HCOOH}^*\ \to\ \mathrm{ HCOO}^* + {{\mathrm{ H}}^{+}}+{e^{-}}\ \to\ \mathrm{ C}{{\mathrm{ O}}_2} +\ 2{{\mathrm{ H}}^{+}} + 2{e^{-}} \)
- (iii)
\( \mathrm{ HCOOH}^*\ \to\ \mathrm{ C}\mathrm{ O}^* +\ {{\mathrm{ H}}_2}\mathrm{ O}\ \to\ \mathrm{ C}{{\mathrm{ O}}_2} + 2{{\mathrm{ H}}^{+}} +\...
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Kang, Y., Murray, C.B. (2014). Formic Acid Oxidation. In: Kreysa, G., Ota, Ki., Savinell, R.F. (eds) Encyclopedia of Applied Electrochemistry. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6996-5_402
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