Surface area independent response of closed bipolar electrodes

Article Electrochemistry

The development of micro-sized enzyme sensor based on direct electron transfer type open circuit potential sensing principle

David Probst et al.

Summary: This study demonstrates the size independency of an OCP-based enzyme sensor, which can be applied to an implantable and continuous monitoring system for metabolites in vivo.

ELECTROCHIMICA ACTA (2022)

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Article Biochemical Research Methods

A fully screen-printed potentiometric chloride ion sensor employing a hydrogel-based touchpad for simple and non-invasive daily electrolyte analysis

Yusuke Ichimura et al.

Summary: This study demonstrates the passive, non-invasive extraction and in situ potentiometric detection of human sweat chloride ions using a stable printed planar liquid-junction reference electrode-integrated hydrogel-based sensor pad. The sensor pad composed of screen-printed Ag/AgCl-based electrodes can continuously extract sweat Cl- ions into the gel for detection without the need for exercise or drug administration. The fully screen-printed sensor shows promise for low-cost daily monitoring of human Cl- ions in sweat in the future.

ANALYTICAL AND BIOANALYTICAL CHEMISTRY (2021)

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Article Chemistry, Analytical

Self-Powered Electrochromic Readout of Potentiometric pH Electrodes

Sutida Jansod et al.

Summary: This study introduces an absorbance-based colorimetric sensor array that is self-powered by an ion-selective electrode (ISE) in a short-circuited cell. By utilizing the potential at the ISE to directly transfer its power to a potential-dependent Prussian blue (PB) film, the color change of the PB film can be activated without an external power supply. The potential of the PB detection element is optimized to change color in response to the ion activity in the sample, providing an analytical signal.

ANALYTICAL CHEMISTRY (2021)

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Article Chemistry, Physical

Prussian White with Near-Maximum Specific Capacity in Sodium-Ion Batteries

Cheryldine Q. X. Lim et al.

Summary: This study presents a mild, low-temperature synthesis method for Prussian white (PW) using a common sodium borohydride reducing agent. The achieved PW exhibits a remarkably high specific capacity in a sodium-ion half-cell battery and demonstrates near-maximum capacities in complete full-cell batteries as proof-of-concept. The successful preservation of Na+ intercalation sites during a critical heat-vacuum-drying step is attributed to the high specific capacity achieved, marking a significant advancement towards the future deployment of sodium-ion rechargeable batteries in consumer electronic devices.

ACS APPLIED ENERGY MATERIALS (2021)

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Article Chemistry, Analytical