We report a first solution strategy for controlled synthesis of Adams' catalyst (i.e., α-PtO(2)) by a facile and totally green approach using H(2)PtCl(6) and water as reactants. The prepared α-PtO(2) nanocrystals (NCs) are ultrasmall in size and have very "clean" surfaces, which can be reduced to Pt NCs easily in ethanol under ambient conditions. Such Adams' catalysts have been applied as electrocatalysts beyond the field of heterogeneous catalysis. Noticeably, the water-only synthesized α-PtO(2) NCs and their derivative Pt NCs all exhibit much higher oxygen reduction reaction (ORR) activities and stabilities than that of the state-of-art Pt/C electrocatalysts. This study provides an example on the organics-free synthesis of α-PtO(2) and Pt NCs as promising cathode catalysts for fuel cell applications and, particularly, this simple, straightforward method may open a new way for the synthesis of other "clean" functional nanomaterials.
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http://dx.doi.org/10.1002/chem.201200353 | DOI Listing |
Ther Adv Hematol
December 2024
Departments of Pediatrics and Pathology, University of Michigan, Ann Arbor, MI, USA.
Background: Hemophilia A is caused by coagulation factor VIII (FVIII) deficiency and increases bleeding risk during invasive procedures.
Objectives: To investigate FVIII concentrate use and bleeding outcomes for invasive procedures after valoctocogene roxaparvovec gene transfer.
Design: This manuscript presents post hoc analysis of the phase III GENEr8-1 trial.
Nat Commun
December 2024
Department of Physics, University of Texas at Arlington, Arlington, TX, USA.
The imaging of individual Ba ions in high pressure xenon gas is one possible way to attain background-free sensitivity to neutrinoless double beta decay and hence establish the Majorana nature of the neutrino. In this paper we demonstrate selective single Ba ion imaging inside a high-pressure xenon gas environment. Ba ions chelated with molecular chemosensors are resolved at the gas-solid interface using a diffraction-limited imaging system with scan area of 1 × 1 cm located inside 10 bar of xenon gas.
View Article and Find Full Text PDFMater Horiz
November 2024
School of Materials Science and Hydrogen Energy, Foshan University, Foshan, 528000, P.R. China.
While proton exchange membrane water electrolyzers (PEMWEs) are essential for realizing practical hydrogen production, the trade-off among activity, stability, and cost of state-of-the-art iridium (Ir)-based oxygen evolution reaction (OER) electrocatalysts for PEMWE implementation is still prohibitively challenging. Ir minimization coupled with mass activity improvement of Ir-based catalysts is a promising strategy to address this challenge. Here, we present a discovery demonstrating that boron doping facilitates the one-dimensional (1D) anisotropic growth of IrO crystals, as supported by both experimental and theoretical evidence.
View Article and Find Full Text PDFACS Macro Lett
October 2024
Chair of Macromolecular Materials and Fiber Chemistry, Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
ACS Energy Lett
August 2024
Department of Chemistry, University of Zurich, Zurich, 8057, Switzerland.
Molybdenum sulfide serves as an effective nonprecious metal catalyst for hydrogen evolution, primarily active at edge sites with unsaturated molybdenum sites or terminal disulfides. To improve the activity at a low loading density, two molybdenum sulfide clusters, [MoS] and [MoS], were investigated. The MoS molecular catalysts were heterogenized on SbSe with a simple soaking treatment, resulting in a thin catalyst layer of only a few nanometers that gave up to 20 mA cm under one sun illumination.
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