Zerdoumi Ridha, Quast Thomas, Tetteh Emmanuel Batsa, Kim Moonjoo, Li Lejing, Dieckhöfer Stefan, Schuhmann Wolfgang
Analytical Chemistry-Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstr. 150, D-44780 Bochum, Germany.
Anal Chem. 2024 Jul 9;96(27):10886-10892. doi: 10.1021/acs.analchem.4c00149. Epub 2024 Jun 26.
Scanning electrochemical microscopy (SECM) and scanning electrochemical cell microscopy (SECCM) were integrated in a single bifunctional probe for simultaneous mapping of the oxygen reduction current and the oxidation current of the produced HO. The dual probe is fabricated from a double-barrel θ capillary, comprising one open barrel filled with the electrolyte and another filled with pyrolytic carbon. Pt is deposited with a gas injection system (GIS) at the end of the carbon barrel. The probe integrates the advantages of both SECM and SECCM by forming an electrochemical droplet cell that embeds the Pt working electrode of the carbon barrel directly into the electrolyte meniscus formed upon sample contact from the electrolyte barrel. The versatility of the dual probe is demonstrated by mapping the oxygen reduction reaction (ORR) current and the HO oxidation current of a Pt microstrip on a gold substrate. This allows simultaneous localized electrochemical measurements, highlighting the potential of the dual probe for broader applications in characterizing the electrocatalytic properties of materials.
扫描电化学显微镜（SECM）和扫描电化学池显微镜（SECCM）集成在一个双功能探针中，用于同时绘制氧还原电流和所产生的羟基自由基（HO）的氧化电流图。该双功能探针由双管θ毛细管制成，其中一个开口管填充有电解质，另一个填充有热解碳。通过气体注入系统（GIS）在碳管末端沉积铂。该探针通过形成一个电化学液滴池，将碳管的铂工作电极直接嵌入到与电解质管中的样品接触时形成的电解质弯月面中，从而整合了SECM和SECCM的优点。通过绘制金基底上铂微带的氧还原反应（ORR）电流和HO氧化电流图，展示了双功能探针的多功能性。这允许进行同时的局部电化学测量，突出了双功能探针在表征材料电催化性能方面更广泛应用的潜力。
