THESIS
2016
xvi, 65 pages : illustrations (some color) ; 30 cm
Abstract
In this project, the specific adsorption of different ions (ClO
4-, F
-, Cl
-, CO
32-, SO
42-, citrate and
Nafion) and their impacts on oxygen reduction reaction on Pt and Pd surfaces were investigated.
SO
4-, CO
3- and citrate anions were found to strongly adsorb on Pt/C catalyst and lead to a
significant loss of oxygen reduction reaction activity in alkaline solutions. In acidic solutions, the effect of ClO
4- was found to be negligible. In alkaline solutions, citrate anions can strongly
adsorb on Pd/C catalyst and significantly lower the oxygen reduction reaction activity. Cation
effect (Li
+, Na
+, K
+) was evaluated on both Pt/C and Pd/C, which showed no impact on oxygen
reduction reaction on Pd/C but huge influence on Pt/C. In the synthesis of Pd-Pt core-shell
nanocatalysts, citric ac...[
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In this project, the specific adsorption of different ions (ClO
4-, F
-, Cl
-, CO
32-, SO
42-, citrate and
Nafion) and their impacts on oxygen reduction reaction on Pt and Pd surfaces were investigated.
SO
4-, CO
3- and citrate anions were found to strongly adsorb on Pt/C catalyst and lead to a
significant loss of oxygen reduction reaction activity in alkaline solutions. In acidic solutions, the effect of ClO
4- was found to be negligible. In alkaline solutions, citrate anions can strongly
adsorb on Pd/C catalyst and significantly lower the oxygen reduction reaction activity. Cation
effect (Li
+, Na
+, K
+) was evaluated on both Pt/C and Pd/C, which showed no impact on oxygen
reduction reaction on Pd/C but huge influence on Pt/C. In the synthesis of Pd-Pt core-shell
nanocatalysts, citric acid was used to help improve the coverage of Pt shell due to its specific adsorption on Pt surfaces. It was also used to synthesize size-controlled Pd nanoparticles by
varying the citrate concentration and synthesis temperature.
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