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Polyaniline (PANI), with merits of high electronic conductivity and capacity, is a promising material for zinc (Zn)-ion batteries. However, its redox window in Zn batteries is often limited, mainly due to the oxidative degradation at high potentials-in which imine groups can be attacked by water molecules. Here, we introduce phytic acid, a kind of supermolecule acid radical ion, as a dopant and electrolyte additive. Various / analyses and theoretical calculations prove that the steric hindrance effect can prevent electroactive sites from the attack by water molecules. Meanwhile, the redox reaction can be stabilized by an even distribution of electron cloud due to the conjugated structure of phenazine groups. Accordingly, the assembled Zn-PANI battery can allow stable and long-term charge-discharge reactions to occur at a potential as high as 2.0 V with a discharged plateau of 1.5 V, and it also shows high rate performance and stable long cycle life (75% capacity retention after 1000 cycles at 10 A g).
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10646929 | PMC |
http://dx.doi.org/10.1039/d3sc04766k | DOI Listing |
Dalton Trans
December 2024
Department of Chemistry, National Changhua University of Education, Changhua 50058, Taiwan.
This study investigates the mechanism of prototropic tautomerization in metal-bound asymmetric pyrazole (R-PzH) ligands during Cu(II)-mediated PzH-MeCN coupling reactions. Intrinsic prototropic tautomerization of metal-bound ligands has not been previously documented. Various new bis-pyrazolylamidino Cu(II) complexes, [Cu(R-Pz(HNC(Me)))(ClO)], from the coupling reaction, and tetrakis pyrazole Cu(II) complexes, [Cu(R-PzH)(ClO)], with symmetric and asymmetric -monosubstituted R-PzH ligands were synthesized and characterized.
View Article and Find Full Text PDFJ Nat Prod
December 2024
College of Pharmacy and Research Institute of Pharmaceutical Sciences, Sookmyung Women's University, Seoul 04310, Republic of Korea.
Nonenzymatic reactions, though critical in natural product biosynthesis, are significantly challenging to control. Adding 3% NaI to the culture medium of significantly increased pseurotin D () production and decreased pseurotin A () production. Previously, and were suggested to be produced via a nonenzymatic reaction, where the epoxide at C-10 undergoes S2 () or S2' () reactions.
View Article and Find Full Text PDFDalton Trans
December 2024
Department of Chemistry and Center for Sustainable Chemistry, Ghent University, Krijgslaan 281 (S-3), 9000, Ghent, Belgium.
The synthesis, isolation, and full characterization of a series of NHC-copper perfluoro-alkoxide complexes are reported. Their exceptional stability resides with the steric hindrance of the nonafluoro--butyl alkoxide moiety, which exhibits a strong electron withdrawing effect. These new Cu(I) complexes are synthons that can permit the activation of acidic N-H and S-H bonds.
View Article and Find Full Text PDFNano Lett
December 2024
Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37212, United States.
Atomically thin 2D materials present the potential for advancing membrane separations via a combination of high selectivity (from molecular sieving) and high permeance (due to atomic thinness). However, the creation of a high density of precise nanopores (narrow-size-distribution) over large areas in 2D materials remains challenging, and nonselective leakage from nanopore heterogeneity adversely impacts performance. Here, we demonstrate protein-enabled size-selective defect sealing (PDS) for atomically thin graphene membranes over centimeter scale areas by leveraging the size and reactivity of permeating proteins to preferentially seal larger nanopores (≥4 nm) while preserving a significant amount of smaller nanopores (via steric hindrance).
View Article and Find Full Text PDFSmall
December 2024
Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710062, China.
The efficient separation of C₂H₂/CO₂ mixture is crucial for industrial applications. A promising strategy is proposed herein to fine-tune the C₂H₂/CO adsorption and separation by pillar-layered metal-organic framework (MOF) adsorbents via molecular rotation. Keeping the same ultramicroporous architecture, three Zn-X-TRZ (TRZ = 1,2,4-triazole) adsorbents are prepared with X-pillar rotors varying from 9,10-anthracenedicarboxylic acid (ADC), 1,4-naphthalenedicarboxylic acid (NDC) to 1,4-benzenedicarboxylic acid (BDC).
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