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A kinetic framework is introduced for a pseudocapacitive potentiometric biosensor. Mathematical derivation and kinetic modeling demonstrate that experimentally observed linearity in analyte-OCP response arises from a dynamic equilibrium between competing redox reactions on a single electrode. This system can be expanded to develop a new generation of biosensors.
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http://dx.doi.org/10.1039/d5cc00926j | DOI Listing |
Angew Chem Int Ed Engl
August 2025
State Key Laboratory of Structural Chemistry, and Fujian Provincial Key Laboratory of Materials and Techniques toward Hydrogen Energy, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
Sodium-ion hybrid capacitors (SIHCs) offer a cutting-edge synergy between battery-level energy density and supercapacitor-like power density, yet face critical challenges in balancing the kinetic and capacity mismatch between Faradaic anodes and capacitive cathodes. Herein, we present a penta-element doped gradient-porous carbon (PE-GPC) with a nanosphere architecture, engineered with high-entropy principles and a gradual pore density variation to enhance mass transport and charge storage. Operando spectroscopy and machine learning potentials unveil a concerted penta-element interplay: thiophene-like S configurations mediate dynamic redox processes, enabling pseudocapacitive Na⁺ and anion storage, while fluorine functionalities foster a self-rejuvenating NaF-rich solid electrolyte interphase (SEI), stabilizing long-term cycling.
View Article and Find Full Text PDFEnviron Sci Technol
June 2025
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China.
The global water crisis demands sustainable desalination innovations, with capacitive deionization (CDI) emerging as an energy-efficient electrochemical alternative. While organic materials demonstrate pseudocapacitive ion capture through ion coordination for CDI electrodes, their effectiveness remains constrained by molecular chain packing and deficient redox-active sites. This work introduces a novel biocompatible dual-redox polymer (PNDBI) with high molecular flexibility to address these limitations.
View Article and Find Full Text PDFNanoscale Adv
June 2025
Department of Chemistry, Christ University Bengaluru 560029 Karnataka India
Metal-organic frameworks (MOFs), owing to their distinctive structural properties and customizable functionalities, have been garnering significant attention in the pursuit of advanced energy storage and conversion technologies. In this work, a bimetallic MOF, CuNi-PTC, has been synthesized through a straightforward method. Investigations reveal its potential as a high-performance electrode material for supercapacitors and as an electrocatalyst for water splitting.
View Article and Find Full Text PDFChem Commun (Camb)
June 2025
Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA.
A kinetic framework is introduced for a pseudocapacitive potentiometric biosensor. Mathematical derivation and kinetic modeling demonstrate that experimentally observed linearity in analyte-OCP response arises from a dynamic equilibrium between competing redox reactions on a single electrode. This system can be expanded to develop a new generation of biosensors.
View Article and Find Full Text PDFJ Colloid Interface Sci
May 2025
School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025 Guizhou Province, PR China; Collaborative Innovation Center of Guizhou Province for Efficient Utilization of Phosphorus and Fluorine Resources, Guizhou University, Guiyang 550025 Guizhou Province, PR China. Electronic a
Lower voltage window and limited pseudocapacitive active sites are identified as critical impediments hindering the advancement of nickel-based supercapacitors. Herein, a double-confined strategy involving nanosizing and heterointerfaces is proposed to construct nickel-based sulfide composite (PMO@NiS/NiS@C) with abundant oxygen vacancies (O), sulfur vacancies (S), and heterostructures. The composite was prepared using liquid-phase in situ self-assembly and low-temperature in situ induction techniques.
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