Papers by Adriana Mendoza-garcia
Advanced Functional Materials, 2016
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Three Dimensional Structure of Solar Active Regions, 1998
... The Helium Spectrum in the Quiet Sun: The January 16/17 and May 7-13 1997 Coordinated SOHO/Gr... more ... The Helium Spectrum in the Quiet Sun: The January 16/17 and May 7-13 1997 Coordinated SOHO/Ground-Based Observational Campaigns Vincenzo Andretta Stuart D. Jordan Karin Muglach Adriana Garcia Harrison P. Jones Matthew J. Penn and Dirk Soltau 1 NJ4SA/GSFC ...
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Nanoscale, 2016
Sea urchin-like (CoxFe1-x)2P shows Co/Fe-composition dependent catalysis for oxygen evolution rea... more Sea urchin-like (CoxFe1-x)2P shows Co/Fe-composition dependent catalysis for oxygen evolution reaction (OER) in 0.1 M KOH. The (Co0.54Fe0.46)2P is the most efficient OER catalyst, reaching 10 mA cm(-2) at an overpotential of 0.37 V (vs. RHE). The report offers a new synergistic approach to tune and optimize the electrocatalysis of OER.
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Journal of The Electrochemical Society, 2015
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Angewandte Chemie (International ed. in English), Jan 26, 2015
A facile approach to bimetallic phosphides, Co-Fe-P, by a high-temperature (300 °C) reaction betw... more A facile approach to bimetallic phosphides, Co-Fe-P, by a high-temperature (300 °C) reaction between Co-Fe-O nanoparticles and trioctylphosphine is presented. The growth of Co-Fe-P from the Co-Fe-O is anisotropic. As a result, Co-Fe-P nanorods (from the polyhedral Co-Fe-O nanoparticles) and sea-urchin-like Co-Fe-P (from the cubic Co-Fe-O nanoparticles) are synthesized with both the nanorod and the sea-urchin-arm dimensions controlled by Co/Fe ratios. The Co-Fe-P structure, especially the sea-urchin-like (Co0.54 Fe0.46 )2 P, shows enhanced catalysis for the oxygen evolution reaction in KOH with its catalytic efficiency surpassing the commercial Ir catalyst. Our synthesis is simple and may be readily extended to the preparation of other multimetallic phosphides for important catalysis and energy storage applications.
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Journal of the American Chemical Society, Jan 10, 2015
Monodisperse cobalt (Co) nanoparticles (NPs) were synthesized and stabilized against oxidation vi... more Monodisperse cobalt (Co) nanoparticles (NPs) were synthesized and stabilized against oxidation via reductive annealing at 600 °C. The stable Co NPs are active for catalyzing the oxygen evolution reaction (OER) in 0.1 M KOH, producing a current density of 10 mA/cm(2) at an overpotential of 0.39 V (1.62 V vs RHE, no iR-correction). Their catalysis is superior to the commercial Ir catalyst in both activity and stability. These Co NPs are also assembled into a monolayer array on the working electrode, allowing the detailed study of their intrinsic OER activity. The Co NPs in the monolayer array show 15 times higher turnover frequency (2.13 s(-1)) and mass activity (1949 A/g) than the NPs deposited on conventional carbon black (0.14 s(-1) and 126 A/g, respectively) at an overpotential of 0.4 V. These stable Co NPs are a promising new class of noble-metal-free catalyst for water splitting.
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Nano letters, Jan 27, 2015
Fully-ordered face-centered tetragonal (fct) FePt nanoparticles (NPs) are synthesized by thermal ... more Fully-ordered face-centered tetragonal (fct) FePt nanoparticles (NPs) are synthesized by thermal annealing of the MgO-coated dumbbell-like FePt-Fe3O4 NPs followed by acid washing to remove MgO. These fct-FePt NPs show strong ferromagnetism with room temperature coercivity reaching 33 kOe. They serve as a robust electrocatalyst for the oxygen reduction reaction (ORR) in 0.1 M HClO4 and hydrogen evolution reaction (HER) in 0.5 M H2SO4 with much enhanced activity (the most active fct-structured alloy NP catalyst ever reported) and stability (no obvious Fe loss and NP degradation after 20,000 cycling between 0.6-1.0 V (vs. RHE)). Our work demonstrates a reliable approach to FePt NPs with much improved fct-ordering and catalytic efficiency for ORR and HER.
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Palaeogeography, Palaeoclimatology, Palaeoecology, 2007
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Journal of the American Chemical Society, Jan 22, 2014
Controlling the electronic structure and surface strain of a nanoparticle catalyst has become an ... more Controlling the electronic structure and surface strain of a nanoparticle catalyst has become an important strategy to tune and to optimize its catalytic efficiency for a chemical reaction. Using density functional theory (DFT) calculations, we predicted that core/shell M/CuPd (M = Ag, Au) NPs with a 0.8 or 1.2 nm CuPd2 shell have similar but optimal surface strain and composition and may surpass Pt in catalyzing oxygen reduction reactions. We synthesized monodisperse M/CuPd NPs by the coreduction of palladium acetylacetonate and copper acetylacetonate in the presence of Ag (or Au) nanoparticles with controlled shell thicknesses of 0.4, 0.75, and 1.1 nm and CuPd compositions and evaluated their catalysis for the oxygen reduction reaction in 0.1 M KOH solution. As predicted, our Ag/Cu37Pd63 and Au/Cu40Pd60 catalysts with 0.75 and 1.1 nm shells were more efficient catalysts than the commercial Pt catalyst (Fuel Cells Store), with their mass activity reaching 0.20 A/mg of noble metal a...
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International Journal of Modern Physics B, 2009
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ACS Catalysis, 2014
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Nanoscale, 2014
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Journal of Quantitative Spectroscopy and Radiative Transfer, 2010
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Journal of Nonlinear Optical Physics & Materials, 2008
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Journal of Nonlinear Optical Physics & Materials, 2010
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Journal of Modern Optics, 2012
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Cool Stars, Stellar …, 1998
... RA Donahue and JA Bookbinder Investigating the Formation of the Helium Spectrum in the Solar ... more ... RA Donahue and JA Bookbinder Investigating the Formation of the Helium Spectrum in the Solar Atmosphere Vincenzo Stuart D. Jordan', Karin Muglach Adriana Garcia Harrison P. Jones and Dirk Soltau We present the first results of coordinated observations with SOHO (Solar ...
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Solar Physics, 1997
Abstract. A time series of K3 spectroheliograms taken at the Coimbra Observatory exhibits an erup... more Abstract. A time series of K3 spectroheliograms taken at the Coimbra Observatory exhibits an erupting loop on the east limb on July 9, 1982 in active region NOAA 3804. The Goddard SMM Hard X-Ray Burst Spectrometer (HXRBS) observations taken during this period reveal a ...
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Advanced Materials, 2013
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Papers by Adriana Mendoza-garcia