Electrochemically Shape-Controlled Synthesis of Pd Concave-Disdyakis Triacontahedra in Deep Eutectic Solvent

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• 作者：Lu Wei ; Chang-Deng Xu ; Long Huang ; Zhi-You Zhou ; Sheng-Pei Chen ; Shi-Gang Sun
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：July 28, 2016
• 年：2016
• 卷：120
• 期：29
• 页码：15569-15577
• 全文大小：594K
• 年卷期：0
• ISSN：1932-7455

文摘

Concave-disdyakis triacontahedral palladium nanocrystals (C-DTH Pd NCs) bound with 120 {631} high-index facets were prepared by electrochemically shape-controlled method in deep eutectic solvent (DES). It has found that both the adsorption of urea derived from EDS and the upper (E_U) and lower (E_L) limit potentials of the square-wave potential applied in the synthesis are contributed synergetically in controlling the shape of Pd NCs. The formation of C-DTH Pd NCs with well-defined shape was achieved by the dynamic interaction between urea adsorption at E_U and growth at E_L. In situ FTIR spectroscopic studies revealed that the urea adsorbates at E_U play a crucial role in shape evolution, especially in the formation of C-DTH Pd NCs. It has demonstrated that the as-synthesized C-DTH Pd NCs enclosed by {631} high-index facets exhibit higher electrocatalytic activity than Pd NCs with other shapes bound by {111} low-index facets (octahedral (OH) and icosahedral (IH)) toward ethanol electrooxidation in alkaline medium.