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1. Deciphering the structure and potassium-ion transport mechanism of potassium borate glass

   https://doi.org/10.1039/D4DT00804A  

   Song, Lulu; Hannon, Alex C; Feller, Steve; Liu, Ruirui; McGuire, Peyton; Zhang, Bo; Zhou, Yongquan; Li, Wu; Zhu, Fayan (June 2024, Dalton Transactions)

   In this work, the transport path of potassium ions in potassium borate glass and structural units, NBO and cavity occupancy that affect the transport of potassium ions were analyzed in detail. 

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2. Biomimetic potassium-selective nanopores

   https://doi.org/10.1126/sciadv.aav2568  

   Acar, Elif Turker; Buchsbaum, Steven F.; Combs, Cody; Fornasiero, Francesco; Siwy, Zuzanna S. (February 2019, Science Advances)

   Reproducing the exquisite ion selectivity displayed by biological ion channels in artificial nanopore systems has proven to be one of the most challenging tasks undertaken by the nanopore community, yet a successful achievement of this goal offers immense technological potential. Here, we show a strategy to design solid-state nanopores that selectively transport potassium ions and show negligible conductance for sodium ions. The nanopores contain walls decorated with 4′-aminobenzo-18-crown-6 ether and single-stranded DNA (ssDNA) molecules located at one pore entrance. The ionic selectivity stems from facilitated transport of potassium ions in the pore region containing crown ether, while the highly charged ssDNA plays the role of a cation filter. Achieving potassium selectivity in solid-state nanopores opens new avenues toward advanced separation processes, more efficient biosensing technologies, and novel biomimetic nanopore systems. 

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3. Multifunctional Separator Allows Stable Cycling of Potassium Metal Anodes and of Potassium Metal Batteries

   https://doi.org/10.1002/adma.202105855  

   Liu, Pengcheng; Hao, Hongchang; Celio, Hugo; Cui, Jinlei; Ren, Muqing; Wang, Yixian; Dong, Hui; Chowdhury, Aminur_Rashid; Hutter, Tanya; Perras, Frédéric_A; et al (December 2021, Advanced Materials)

   Abstract This is the first report of a multifunctional separator for potassium‐metal batteries (KMBs). Double‐coated tape‐cast microscale AlF₃on polypropylene (AlF₃@PP) yields state‐of‐the‐art electrochemical performance: symmetric cells are stable after 1000 cycles (2000 h) at 0.5 mA cm⁻²and 0.5 mAh cm⁻², with 0.042 V overpotential. Stability is maintained at 5.0 mA cm⁻²for 600 cycles (240 h), with 0.138 V overpotential. Postcycled plated surface is dendrite‐free, while stripped surface contains smooth solid electrolyte interphase (SEI). Conventional PP cells fail rapidly, with dendrites at plating, and “dead metal” and SEI clumps at stripping. Potassium hexacyanoferrate(III) cathode KMBs with AlF₃@PP display enhanced capacity retention (91% at 100 cycles vs 58%). AlF₃partially reacts with K to form an artificial SEI containing KF, AlF₃, and Al₂O₃phases. The AlF₃@PP promotes complete electrolyte wetting and enhances uptake, improves ion conductivity, and increases ion transference number. The higher of K⁺transference number is ascribed to the strong interaction between AlF₃and FSI⁻anions, as revealed through¹⁹F NMR. The enhancement in wetting and performance is general, being demonstrated with ester‐ and ether‐based solvents, with K‐, Na‐, or Li‐ salts, and with different commercial separators. In full batteries, AlF₃prevents Fe crossover and cycling‐induced cathode pulverization. 

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4. Enantioselective Potassium-Catalyzed Wittig Olefinations

   https://doi.org/10.1021/jacs.4c00564  

   Essman, Jake Z; Jacobsen, Eric N (March 2024, Journal of the American Chemical Society)
5. CHLORINE-POTASSIUM RELATIONS IN HASTINGSITIC AMPHIBOLES

   https://doi.org/10.1130/abs/2020AM-358490  

   Matteucci, Jared; Jenkins, David M. (January 2020, Geological Society of America Abstracts with Programs)

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