Wednesday, 1 June 2016: 15:20
Sapphire Ballroom M (Hilton San Diego Bayfront)
Pure metallic aerogels are potentially invaluable electrocatalyst materials due to their combination of the unique properties of both metals and aerogels.[1] For instance, their large specific surface area provides sufficient reactive sites, which is of great importance for the heterogeneous catalysis. Their high porosity and metallic backbones accelerates the mass and electron transfer during the electrocatalysis process. More important, the stability issues from carbon support corrosion are largely overcome based on their self-supportability.
This contribution focuses on our recent progress on the electrocatalytic investigations at a series of pure metallic aerogels. The electrocatalytic ethanol oxidation activities are doubled on the pure Pd aerogels as compared to Pd/C.[2] With the loading of enzyme, the Pd aerogel shows a 3-fold increased bio-electrocatalytic activity for glucose oxidation.[3] The kinetics of the oxygen reduction reaction is improved by a factor of 5 on the bimetallic PdPt aerogels, which also shows a significantly increased stability as compared to Pt/C.[4] Additionally, we employed an alloyed PdNi hollow nanosphere aerogel to further investigate the effects of morphology and alloying on electrocatalysis.[5] The mass and specific activities for alcohol oxidation are improved by a factor of 5.6 and 4.2, respectively, as compared to Pd/C.
This contribution focuses on our recent progress on the electrocatalytic investigations at a series of pure metallic aerogels. The electrocatalytic ethanol oxidation activities are doubled on the pure Pd aerogels as compared to Pd/C.[2] With the loading of enzyme, the Pd aerogel shows a 3-fold increased bio-electrocatalytic activity for glucose oxidation.[3] The kinetics of the oxygen reduction reaction is improved by a factor of 5 on the bimetallic PdPt aerogels, which also shows a significantly increased stability as compared to Pt/C.[4] Additionally, we employed an alloyed PdNi hollow nanosphere aerogel to further investigate the effects of morphology and alloying on electrocatalysis.[5] The mass and specific activities for alcohol oxidation are improved by a factor of 5.6 and 4.2, respectively, as compared to Pd/C.
References
[1] W. Liu, A. K. Herrmann, N. C. Bigall, P. Rodriguez, D. Wen, M. Oezaslan, T. J. Schmidt, N. Gaponik, A. Eychmüller, Acc. Chem. Res. 2015, 48, 154-162.
[2] W. Liu, A. K. Herrmann, D. Geiger, L. Borchardt, F. Simon, S. Kaskel, N. Gaponik, A. Eychmüller, Angew. Chem. Int. Ed. 2012, 51, 5743-5747.
[3] D. Wen, A. K. Herrmann, L. Borchardt, F. Simon, W. Liu, S. Kaskel, A. Eychmüller, J. Am. Chem. Soc. 2014, 136, 2727-2730.
[4] W. Liu, P. Rodriguez, L. Borchardt, A. Foelske, J. Yuan, A. K. Herrmann, D. Geiger, Z. Zheng, S. Kaskel, N. Gaponik, R. Kotz, T. J. Schmidt, A. Eychmüller, Angew. Chem. Int. Ed. 2013, 52, 9849-9852.
[5] B. Cai, D. Wen, W. Liu, A-K Herrmann, A. Benad and A. Eychmüller, Angew. Chem. Int. Ed. 2015, 54, 13101-13105.