Fabrication of Highly Stable and Efficient PtCu Alloy Nanoparticles on Highly Porous Carbon for Direct Methanol Fuel Cells

Boosting the durability of Pt nanoparticles by controlling the composition and morphology is extremely important for fuel cells commercialization. We deposit the Pt–Cu alloy nanoparticles over high surface area carbon in different metallic molar ratios and optimize the conditions to achieve desired material. The novel bimetallic electro-catalyst {Pt–Cu/PC-950 (15:15%)} offers exceptional electrocatalytic activity when tested for both oxygen reduction reaction and methanol oxidation reactions. A high mass activity of 0.043 mA/μg_Pt (based on Pt mass) is recorded for ORR. An outstanding longevity of this electro-catalyst is noticed when compared to 20 wt % Pt loaded either on PC-950 or commercial carbon. The high surface area carbon support offers enhanced activity and prevents the nanoparticles from agglomeration, migration, and dissolution as evident by TEM analysis

Highly Porous Carbon Derived from MOF‑5 as a Support of ORR Electrocatalysts for Fuel Cells

The development of highly competent electrocatalysts for the sluggish oxygen reduction reaction (ORR) at cathodes of proton-exchange membrane fuel cells (PEMFCs) is extremely important for their long-term operation and wide applications. Herein, we present highly efficient ORR electrocatalysts based on Pt/Ni bimetallic nanoparticles dispersed on highly porous carbon obtained via pyrolysis of a metal–organic framework MOF-5. In comparison to the commercial Pt/C (20%), the electrocatalyst Pt–Ni/PC 950 (15:15%) in this study exhibits a pronounced positive shift of 90 mV in <i>E</i>_onset. In addition, it also demonstrates excellent long-term stability and durability during the 500-cycle continue-oxygen-supply (COS) accelerating durability tests (ADTs). The significantly improved activity and stability of Pt–Ni/PC 950 (15:15%) can be attributed to the Pt electron interaction with Ni and carbon support as has been proved in X-ray and microscopic analysis

Ataf Ali - Excell Data

It contains all data files with description of figures in the file name

SEM micrographs.

<p>(A). ZnO nanorods (B). ZnO nano rods after 18 cycles (C). ZnO micro particles (D). ZnO microparticles after 15 Cycles.</p

Cycle life comparison of ZnO nanorods vs ZnO micro powder.

<p>Cycle life comparison of ZnO nanorods vs ZnO micro powder.</p

XRD patterns of ZnO nanorods, Inside ZnO (PDF 36–1451).

<p>XRD patterns of ZnO nanorods, Inside ZnO (PDF 36–1451).</p

XRD Data of ZnO nanorods.

<p>XRD Data of ZnO nanorods.</p

Physical characteristics of the zinc oxide nanorods.

<p>Physical characteristics of the zinc oxide nanorods.</p

Supplementary Figure 1 from Synthesis and characterization of azo-guanidine based alcoholic media naked eye DNA sensor

UV-Visible spectrum of compound of UA6 (50µM) without DNA and with DNA interaction (20µM-140µM) in 80% ethanol, phosphate buffer (0.1M, pH=7.0). The full scan from 200nm to 800nm

Ataf Ali - Excell Data from Synthesis and characterization of azo-guanidine based alcoholic media naked eye DNA sensor

DNA sensing always has an open meadow of curiosity for biotechnologists and other researchers. Recently, in this field, we have introduced an emerging class of molecules containing azo and guanidine functionalities. In this study, we have synthesized three new compounds (<b>UA1</b>, <b>UA6</b> and <b>UA7</b>) for potential application in DNA sensing in alcoholic medium. The synthesized materials were characterized by elemental analysis, FTIR, UV-visible, ¹H NMR and ¹³C NMR spectroscopies. Their DNA sensing potential were investigated by UV-visible spectroscopy. The insight of interaction with DNA was further investigated by electrochemical (cyclic voltammetry) and hydrodynamic (viscosity) studies. The results showed that compounds have moderate DNA binding properties, with the binding constants range being 7.2 x 10³, 2.4 x 10³ and 0.2 x 10³M^-1, for <b>UA1</b>, <b>UA6</b> and <b>UA7</b>, respectively. Upon binding with DNA, there was a change in colour (a blue shift in the <i>λ</i>_max value) which was observable with a naked eye. These results indicated the potential of synthesized compounds as DNA sensors with detection limit 1.8, 5.8 and 4.0ng µl^-1 for <b>UA1</b>, <b>UA6</b> and <b>UA7</b>, respectively