Electrochemical oxidation of HCOONa on Pt in acidic solutions |
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| Institution: | 1. The University of Tennessee, Knoxville TN 37996, United States;2. Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6226, United States;3. Bredesen Center for Interdisciplinary Research and Education, The University of Tennessee, Knoxville 37996, United States;1. Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa;2. Institut de Recherche en Génie Chimique et Pétrolier (IRGCP), Paris Cedex, France;3. Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada;1. IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM), Universite de Montpellier, Place E. Bataillon, F- 34095, Montpellier, France;2. Van Lang University, 45 Nguyen Khac Nhu, District 1, Ho Chi Minh City, Viet Nam;1. CMPG, Institute of Ecology and Evolution, 3012 Bern, Switzerland;2. Swiss Institute of Bioinformatics, 105 Lausanne, Switzerland |
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| Abstract: | The electrooxidation of HCOONa was carried out over a wide range of pH on Pt. HCOO− and its associated form of HCOOH do not show any difference in electrochemical behaviour. A voltammetric study demonstrates the formation of two kinds of poisoning species in the hydrogen (X1) and double-layer (X2) regions. Their dependences on the potential and pH were examined. Constant polarization measurements give the rate expression, i = k(αH+)−0.43 exp(0.4Fφn/RT), independent of the concentrations of HCOO− and HCOOH. The rate-determining step is concluded to be HCOO− (a) → COO− (a)+H+ + e− or HCOOH(a) → COOH(a)+H+ + e−. The negative reaction order with respect to H+ was explained through the retarding action of X2. The nature of X1 and X2 is discussed. |
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