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Gelatin biotemplated platinum aerogels

Published online by Cambridge University Press:  08 June 2018

Fred J. Burpo
Affiliation:
Department of Chemistry and Life Science, United States Military Academy, West Point, NY10996, USA
Alexander N. Mitropoulos
Affiliation:
Department of Chemistry and Life Science, United States Military Academy, West Point, NY10996, USA Department of Mathematical Sciences, United States Military Academy, West Point, NY10996, USA
Enoch A. Nagelli
Affiliation:
Department of Chemistry and Life Science, United States Military Academy, West Point, NY10996, USA
Madeline Y. Ryu
Affiliation:
Department of Chemistry and Life Science, United States Military Academy, West Point, NY10996, USA
Jesse L. Palmer
Affiliation:
Department of Chemistry and Life Science, United States Military Academy, West Point, NY10996, USA
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Abstract

Here gelatin biotemplated platinum aerogels were prepared from gelatin hydrogels equilibrated in K2PtCl4 solutions ranging from 1-250 mM and reduced with sodium borohydride before supercritical drying in liquid CO2. Scanning electron microscopy revealed an average ligament diameter of 40.6 ± 9.7 nm and a pore size range of ∼10 – 200 nm. Thermogravimetric analysis correlated the ratio of metal content to biotemplate mass as a function of equilibrated platinum ion solution, and X-ray diffractometry indicated platinum metal with no detectable oxide phases. Electrochemical impedance spectroscopy indicated a specific capacitance of 1.92 F/g, with a corresponding specific electrochemical accessible surface area of 6.39 m2/g. Cyclic voltammetry performed in H2SO4 demonstrated biotemplated platinum aerogel potential for catalytic and energy storage applications.

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Copyright © Materials Research Society 2018 

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