000213481 001__ 213481
000213481 005__ 20180317094727.0
000213481 0247_ $$2doi$$a10.1016/j.electacta.2015.10.104
000213481 022__ $$a0013-4686
000213481 02470 $$2ISI$$a000373054200042
000213481 037__ $$aARTICLE
000213481 245__ $$aGold Nanofilm Redox Catalysis for Oxygen Reduction at Soft Interfaces
000213481 269__ $$a2016
000213481 260__ $$aOxford$$bElsevier$$c2016
000213481 300__ $$a12
000213481 336__ $$aJournal Articles
000213481 520__ $$aFunctionalization of a soft or liquid-liquid interface by a one gold nanoparticle thick “nanofilm” provides a conductive pathway to facilitate interfacial electron transfer from a lipophilic electron donor to a hydrophilic electron acceptor in a process known as interfacial redox catalysis. The gold nanoparticles in the nanofilm are charged by Fermi level equilibration with the lipophilic electron donor and act as an interfacial reservoir of electrons. Additional thermodynamic driving force can be provided by electrochemically polarising the interface. Using these principles, the biphasic reduction of oxygen by a lipophilic electron donor, decamethylferrocene, dissolved inα,α, α -trifluorotoluene was catalysed at a gold nanoparticle nanofilm modified water-oil interface. A recently developed microinjection technique was utilised to modify the interface reproducibly with the mirror-like gold nanoparticle nanofilm, while the oxidised electron donor species and the reduction product, hydrogen peroxide, were detected by ion transfer voltammetry and UV/vis spectroscopy, respectively. Metallization of the soft interface allowed the biphasic oxygen reduction reaction to proceed viaan alternative mechanism with enhanced kinetics and at a significantly lower overpotential in comparison to a bare soft interface. Weaker lipophilic reductants, such as ferrocene, were capable of charging the interfacial gold nanoparticle nanofilm but did not have sufficient thermodynamic driving force to significantly elicit biphasic oxygen reduction.
000213481 6531_ $$agold nanoparticles
000213481 6531_ $$asoft interfaces
000213481 6531_ $$aelectron transfer
000213481 6531_ $$aelectrocatalysis
000213481 6531_ $$aoxygen reduction reaction
000213481 700__ $$0246944$$aSmirnov, Evgeny$$g227763
000213481 700__ $$0247474$$aPeljo, Pekka Eero$$g218461
000213481 700__ $$aScanlon, Micheál D.
000213481 700__ $$0242739$$aGirault, Hubert H.$$g105258
000213481 773__ $$j197$$q362–373$$tElectrochimica Acta
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000213481 8564_ $$s2155726$$uhttps://infoscience.epfl.ch/record/213481/files/1-s2.0-S001346861530685X-main.pdf$$yPublisher's version$$zPublisher's version
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000213481 917Z8 $$x208650
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000213481 937__ $$aEPFL-ARTICLE-213481
000213481 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000213481 980__ $$aARTICLE