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Growth of Au and ZnS nanostructures <i>via</i> engineered peptide and M13 bacteriophage templates
Chung, Sungwook,Chung, Woo-Jae,Wang, Debin,Lee, Seung-Wuk,De Yoreo, James J. The Royal Society of Chemistry 2018 SOFT MATTER Vol.14 No.16
<P>We demonstrate directed nucleation of Au and ZnS patterns on templates comprised of functional peptides and an M13 bacteriophage. We discuss the control over nucleation in terms of the interplay between enhanced ion binding and reduced interfacial energy resulting from the presence of the templates.</P>
Kim, Seok-Jin,Mahmood, Javeed,Kim, Changmin,Han, Gao-Feng,Kim, Seong-Wook,Jung, Sun-Min,Zhu, Guomin,De Yoreo, James J.,Kim, Guntae,Baek, Jong-Beom American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.5
<P>Because they provide lower cost but comparable activity to precious platinum (Pt)-based catalysts, nonprecious iron (Fe)-based materials, such as Fe/Fe<SUB>3</SUB>C and Fe–N–C, have gained considerable attention as electrocatalysts for the oxygen reduction reaction (ORR). However, their practical application is hindered by their poor stability, which is attributed to the defective protection of extremely unstable Fe nanoparticles. Here, we introduce a synthesis strategy for a stable Fe-based electrocatalyst, which was realized by defect-free encapsulation of Fe nanoparticles using a two-dimensional (2D) phenazine-based fused aromatic porous organic network (Aza-PON). The resulting Fe@Aza-PON catalyst showed electrocatalytic activity (half-wave potential, 0.839 V; Tafel slope, 60 mV decade<SUP>–1</SUP>) comparable to commercial Pt on activated carbon (Pt/C, 0.826 V and 90 mV decade<SUP>–1</SUP>). More importantly, the Fe@Aza-PON displayed outstanding stability (zero current loss even after 100 000 cycles) and tolerance against contamination (methanol and CO poisoning). In a hybrid Li–air battery test, the Fe@Aza-PON demonstrated performance superior to Pt/C.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2018/jacsat.2018.140.issue-5/jacs.7b10663/production/images/medium/ja-2017-10663c_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja7b10663'>ACS Electronic Supporting Info</A></P>