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• W2737417811 endingPage "26785" @default.
• W2737417811 startingPage "26771" @default.
• W2737417811 abstract "High-performance, nonprecious metal bifunctional electrocatalysts for the oxygen reduction and evolution reactions (ORR and OER, respectively) are of great importance for rechargeable metal-air batteries and regenerative fuel cells. A comprehensive study based on statistical design of experiments is presented to investigate and optimize the surfactant-assisted structure and the resultant bifunctional ORR/OER activity of anodically deposited manganese oxide (MnOx) catalysts. Three classes of surfactants are studied: anionic (sodium dodecyl sulfate, SDS), non-ionic (t-octylphenoxypolyethoxyethanol, Triton X-100), and cationic (cetyltrimethylammonium bromide, CTAB). The adsorption of surfactants has two main effects: increased deposition current density due to higher Mn2+ and Mn3+ concentrations at the outer Helmholtz plane (Frumkin effect on the electrodeposition kinetics) and templating of the MnOx nanostructure. CTAB produces MnOx with nanoneedle (1D) morphology, whereas nanospherical- and nanopetal-like morphologies are obtained with SDS and Triton, respectively. The bifunctional performance is assessed based on three criteria: OER/ORR onset potential window (defined at 2 and -2 mA cm-2) and separately the ORR and OER mass activities. The best compromise among these three criteria is obtained either with Triton X-100 deposited catalyst composed of MnOOH and Mn3O4 or SDS deposited catalyst containing a combination of α- and β-MnO2, MnOOH, and Mn3O4.The interaction effects among the deposition variables (surfactant type and concentration, anode potential, Mn2+ concentration, and temperature) reveal the optimal strategy for high-activity bifunctional MnOx catalyst synthesis. Mass activities for OER and ORR up to 49 A g-1 (at 1556 mVRHE) and -1.36 A g-1 (at 656 mVRHE) are obtained, respectively." @default.
• W2737417811 created "2017-07-31" @default.
• W2737417811 creator A5001284831 @default.
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• W2737417811 creator A5068783162 @default.
• W2737417811 date "2017-08-07" @default.
• W2737417811 modified "2023-10-15" @default.
• W2737417811 title "Controlling the Interfacial Environment in the Electrosynthesis of MnO_<i>x</i> Nanostructures for High-Performance Oxygen Reduction/Evolution Electrocatalysis" @default.
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• W2737417811 doi "https://doi.org/10.1021/acsami.7b05501" @default.
• W2737417811 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28718625" @default.
• W2737417811 hasPublicationYear "2017" @default.
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