Effect of Fe state on electrocatalytic activity of Pd-Fe/C catalyst for oxygen reduction |
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| Authors: | Yawen Tang Shuang Cao Tianhong Lu Lude Lu |
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| Institution: | a Key Laboratory for Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing 210094, PR China
b College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097, PR China |
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| Abstract: | The carbon-supported Pd-Fe catalyst (Pd-Fe/C) is prepared in the H2O/tetrahydrofuran (THF) mixture solvent under the low temperature. The homemade Pd-Fe/C catalyst contains two forms of iron species, alloying and non-alloying Fe. The alloying Fe species is hardly dissolved in 0.5 M H2SO4 solution, while the non-alloying Fe species is easily dissolved in 0.5 M H2SO4 solution. The electrochemical measurements show the electrocatalytic activity of the Pd-Fe/C catalyst with the acid treatment for the oxygen reduction is higher than that of the Pd-Fe/C catalyst without the acid treatment, illustrating that the non-alloying Fe species suppresses the electrocatalytic activity of the Pd-Fe/C catalyst. In contrast, the alloying Fe species promotes the electrocatalytic activity of the Pd-Fe/C catalyst for the oxygen reduction, which is likely attributed to the change of the electron structure of Pd atom and/or bond length of Pd-Pd in the Pd-Fe/C catalyst. |
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| Keywords: | Pd-Fe nanoparticle Catalyst Alloy Electrocatalytic activity Oxygen reduction |
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