Noble Metal Aerogel Design for Bio-/Fuel Cell Applications
Our recent efforts have been focused on the design of noble metal aerogels with controllable morphologies or composition and their exploration in bio-/fuel cell applications. Via a cation-induced or a spontaneously running route, we realized the controlled growth of Pd aerogels with different porosities and surface areas and obtained aerogels composed of Pd-Ferrocene. They provided a three-dimensional matrix with high electrical conductivity and high surface area for enzyme loading, showing a promoted bioelectrocatalysis and biofuel cell application.[3,4] On the other hand, a series of highly efficient AuxPty bimetallic aerogel electrocatalysts derived via a host-guest interaction-induced method exhibited high activity, low overpotential, and high CO tolerance toward the direct oxidation of methanol, ethanol and glucose. Additionally, PdxNiy aerogels from kinetically controlled synthesis displayed excellent performance toward the methanol oxidation. Here the non-precious metal component was introduced to lower the cost of the fuel cell electrocatalyst and to increase its activity due to the bimetallic synergistic effect.
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 D. Wen, W. Liu, D. Haubold, A. Eychmüller, 2014, submitted.