Journal ArticleDOI
Combinatorial Electrochemistry: A Highly Parallel, Optical Screening Method for Discovery of Better Electrocatalysts
Erik Reddington,Anthony Sapienza,Anthony Sapienza,Bogdan Gurau,Bogdan Gurau,Rameshkrishnan Viswanathan,Rameshkrishnan Viswanathan,S. Sarangapani,S. Sarangapani,Eugene S. Smotkin,Eugene S. Smotkin,Thomas E. Mallouk,Thomas E. Mallouk +12 more
TLDR
By converting the ions generated in an electrochemical half-cell reaction to a fluorescence signal, the most active compositions in a large electrode array have been identified.Abstract:
Combinatorial screening of electrochemical catalysts by current-voltage methods can be unwieldy for large sample sizes. By converting the ions generated in an electrochemical half-cell reaction to a fluorescence signal, the most active compositions in a large electrode array have been identified. A fluorescent acid-base indicator was used to image high concentrations of hydrogen ions, which were generated in the electrooxidation of methanol. A 645-member electrode array containing five elements (platinum, ruthenium, osmium, iridium, and rhodium), 80 binary, 280 ternary, and 280 quaternary combinations was screened to identify the most active regions of phase space. Subsequent “zoom” screens pinpointed several very active compositions, some in ternary and quaternary regions that were bounded by rather inactive binaries. The best catalyst, platinum(44)/ruthenium(41)/osmium(10)/iridium(5) (numbers in parentheses are atomic percent), was significantly more active than platinum(50)/ruthenium(50) in a direct methanol fuel cell operating at 60°C, even though the latter catalyst had about twice the surface area of the former.read more
Citations
More filters
Journal ArticleDOI
A review of anode catalysis in the direct methanol fuel cell
Hansan Liu,Chaojie Song,Lei Zhang,Jiujun Zhang,Haijiang Wang,David P. Wilkinson,David P. Wilkinson +6 more
TL;DR: More than 100 articles related to anode catalysts for the direct methanol fuel cell (DMFC) are reviewed, mainly focusing on the three most active areas: (1) progress in preparation methods of Pt-Ru catalysts with respect to activity improvement and utilization optimization; (2) preparation of novel carbon materials as catalyst supports to create a highly dispersed and stably supported catalysts; (3) exploration of new catalysts having a low noble metal content and non-noble metal elements through fast activity down-selection methods such as combinatorial methods.
Journal ArticleDOI
Modern Strategies in Electroorganic Synthesis
TL;DR: Electrochemical Properties of scCO2 2285 5.1.
Journal ArticleDOI
Palladium in fuel cell catalysis
TL;DR: In this paper, a comparison of binary and ternary platinum-based catalysts and non-platinum based catalysts for low-temperature fuel cells is presented, showing that the performance of Pd and Pd-containing catalysts can be improved with the addition of a suitable metal such as Co or Fe.
Journal ArticleDOI
Carbothermal shock synthesis of high-entropy-alloy nanoparticles
Yonggang Yao,Zhennan Huang,Pengfei Xie,Steven D. Lacey,Rohit J. Jacob,Hua Xie,Fengjuan Chen,Anmin Nie,Tiancheng Pu,Miles C. Rehwoldt,Daiwei Yu,Michael R. Zachariah,Chao Wang,Reza Shahbazian-Yassar,Ju Li,Liangbing Hu +15 more
TL;DR: A general route for alloying up to eight dissimilar elements into single-phase solid-solution nanoparticles, referred to as high-entropy-alloy nanoparticles (HEA-NPs), by thermally shocking precursor metal salt mixtures loaded onto carbon supports is presented.
Journal ArticleDOI
Chemical and Electronic Effects of Ni in Pt/Ni and Pt/Ru/Ni Alloy Nanoparticles in Methanol Electrooxidation
Kyung-Won Park,Jong-Ho Choi,Boo-Kil Kwon,and Seol-Ah Lee,Yung-Eun Sung,Heung-Yong Ha and,Seong Ahn Hong,Hongsun Kim and,Andrzej Wieckowski +8 more
TL;DR: In this paper, the role of Ni as a catalytically enhancing agent in the methanol oxidation process was investigated using cyclic voltammetry, chronoamperometry, X-ray photoelectron spectroscopy, transmission electron microscopy, and Xray diffraction.
References
More filters
Journal ArticleDOI
Light-directed, spatially addressable parallel chemical synthesis.
TL;DR: High-density arrays formed by light-directed synthesis are potentially rich sources of chemical diversity for discovering new ligands that bind to biological receptors and for elucidating principles governing molecular interactions.
Journal ArticleDOI
A new type of synthetic peptide library for identifying ligand-binding activity
Kit S. Lam,Sydney E. Salmon,Evan M. Hersh,Victor J. Hruby,Wieslaw M. Kazmierski,Richard J. Knapp +5 more
TL;DR: The simple methodology greatly enhances the production and rapid evaluation of random libraries of millions of peptides so that acceptor-binding ligands of high affinity can be rapidly identified and sequenced, on the basis of a "one-bead, one-peptide9 approach.
Journal ArticleDOI
The oxidation of small organic molecules: A survey of recent fuel cell related research
R. Parsons,T. VanderNoot +1 more
TL;DR: In this paper, a review of recent electrochemical literature concerning the oxidation of small organic molecules as potential fuels for fuel cells is presented, and the nature of poisoning species and reaction intermediates are discussed.
Journal ArticleDOI
"Diversomers": an approach to nonpeptide, nonoligomeric chemical diversity.
Sheila Dewitt,John S. Kiely,Charles J. Stankovic,Mel C. Schroeder,Donna Reynolds Cody,Michael R. Pavia +5 more
TL;DR: Solid-phase chemistry, organic synthesis, and an apparatus for multiple, simultaneous synthesis have been combined to generate libraries of organic compounds ("diversomers"), illustrated by the syntheses of dipeptides, hydantoins, and benzodiazepines.
Journal ArticleDOI
An unnatural biopolymer
Charles Y. Cho,Edmund J. Moran,Sara Cherry,James C. Stephans,Stephen P. A. Fodor,Cynthia L. Adams,Arathi Sundaram,Jeffrey W. Jacobs,Peter G. Schultz +8 more
TL;DR: Oligocarbamates and other unnatural polymers may provide new frameworks for drug development and for testing theories of protein and peptide folding and structure.