Per-and polyfluroalkyl substances (PFAS) are drawing increasing attention in the research community due to their wide spread applications and their toxicity to animals and humans. Effective early detection method of PFAS chemicals in aqueous environment is important to reduce exposure and mitigate the potential toxic effects. This study focuses on the electrochemical detection of per-fluoro octane sulfonate (PFOS) with differential pulse voltammetry and electrochemical impedance spectroscopy on a bare platinum electrode. We observe three distinct regions of adsorption behaviors with respect to PFOS concentration from 0-1000 nM, reflecting changes in the modes of adsorption due to different adsorbate-adsorbate interactions on a bare electrode. The adsorption isotherm constant for PFOS adsorption on a Pt electrode is calculated to be 1.6 × 10 12 cm 3 mol À 1 from fitting the electrochemical data with a modified Langmuir isotherm model.
Cooling represents a considerable fraction of energy consumption, while it is indispensable to develop eco-friendly, biocompatible, and ductile cooling materials for personal applications. In this study, we demonstrate the ductile...
Zinc-air
batteries are a promising alternative to lithium ion batteries
due to their large energy density, safety, and low production cost.
However, the stability of the zinc-air battery is often low due to
the formation of dendrite which causes short circuiting and the CO2 adsorption from the air which causes carbonate formation
on the air electrode. In this work, we demonstrate a zinc-air battery
design with acidic oxygen reduction reaction for the first time via
the incorporation of a bipolar membrane. The bipolar membrane creates
a locally acidic environment in the air cathode which could lead to
a higher oxygen reduction reaction activity and a better 4-electron
selectivity toward water instead of the 2-electron pathway toward
peroxide. Locally acidic air cathode is also effective at improving
the cell’s durability by preventing carbonate formation. Gas
chromatography confirms that CO2 adsorption is 7 times
lower in the bipolar membrane compared to a conventional battery separator.
A stable cycling of 300+ hours is achieved at 5 mA/cm2.
Dendrite formation is also mitigated due to the mechanical strength
of the membrane. The insights from this work could be leveraged to
develop a better zinc-air battery design for long-term energy storage
applications.
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