A fast voltammetric pH microsensor based on electropolymerization of methylene blue

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2025-03-19 DOI:10.1016/j.electacta.2025.146082

Isabell Wachta , Wei Nie , Gloria Alexander , Christopher S. Kley , Kannan Balasubramanian

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Abstract

Microsensors for resolving local pH are versatile analytical tools for studying reactions at solid-liquid interfaces in applications such as electrocatalysis and corrosion. However, the achievable temporal resolution is limited, hindering the operando investigation of local pH at surfaces in electrochemical reactions. Here, we present a methodology to achieve a high time resolution by deploying AC voltammetry with a pH microsensor. The sensor is composed of a gold ultramicroelectrode functionalized with electropolymerized methylene blue at its tip, allowing for continuous monitoring of pH in aqueous solutions in the neutral and acidic regime at a subsecond time resolution. As a proof-of-principle, we show that our sensors can be used for detecting interfacial pH at an electrified platinum nanoparticle-modified carbon electrode during the hydrogen and oxygen evolution reactions. The fast pH sensing capability is expected to open an avenue for routine operando studies of local pH at electrified interfaces.

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.