期刊
BIOTECHNOLOGY AND BIOENGINEERING
卷 111, 期 11, 页码 2349-2354出版社
WILEY-BLACKWELL
DOI: 10.1002/bit.25267
关键词
mesoporous; biotemplate; exoelectrogenic; catalytic
资金
- King Abdullah University of Science and Technology (KAUST)
- National Science Foundation (NSF) Graduate Research Fellowship Program
Mesoporous structures can increase catalytic activity by maximizing the ratio of surface area to volume, but current synthesis techniques utilize expensive polymers and toxic chemicals. A Geobacter sulfurreducens biofilm was used as a sustainable template to form mesoporous Pd structures while eliminating the need for synthetic chemicals. The bulk of the biofilm material was removed by thermal treatments after nanoparticle formation, producing a catalytic Pd mesoporous (pore size 9.7 +/- 0.1 nm) structure attached to the graphite electrode with a 1.5-2 mm thick backbone composed of nanoparticles (similar to 200 nm). A control electrode electrochemically plated with Pd in the absence of a biofilm exhibited a variable planar Pd base (similar to 0.5-3 mu m thick) with sporadic Pd extrusions (similar to 2 mu m across, 1-5 mu m tall) from the surface. The biotemplated mesoporous structure produced 15-20% higher stable current densities during H-2 oxidation tests than the electrochemically plated control electrode, even though 30% less Pd was present in the biotemplated catalyst. These results indicate that electroactive biofilms can be used as a sustainable base material to produce nanoporous structures without the need for synthetic polymers. (C) 2014 Wiley Periodicals, Inc.
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