SECM screening of the catalytic activities of AuPd bimetallic patterns fabricated by electrochemical wet-stamping technique

Abstract

a b s t r a c tElectrocatalyst arrays with various AuPd compositions have been deposited onto an indium tin oxide (ITO) surface by an electrochemical wet-stamping (EWETS) technique. Micropatterned high-strength agarose containing different solutions of chloroauric acid and chloropalladic acid has been used to electrodeposit and generate patterns of AuPd nanoparticle arrays on ITO. The compositions of the AuPd catalysts prepared by EWETS have been determined through a combination of energy-dispersive X-ray analysis (EDX) and X-ray diffraction spectroscopy (XRD). Field-emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM) have been employed to characterize their morphology. The electrochemical activities of the AuPd alloys for H 2 O 2 and FcMeOH + reduction reactions have been investigated in both redox-competition and feedback modes by means of scanning electrochemical microscopy (SECM). The results obtained from SECM images were well corroborated by calculated heterogeneous electron transfer (HET) rates for the respective AuPd electrodes, demonstrating that the SECM was applicable for the screening of multicomponent alloy catalysts and determining the optimal composition for electrocatalytic reactions.

Scanning Probe Microscopy for Nanoscale Electrochemical Imaging

“…The Pt NPs were better resolved than those shown in Figure a because of the closer tip distance . SECM was applied to screen Ag NPs for the electrocatalytic degradation of CHCl 3 . The electrochemical activities of AuPd alloys for H 2 O 2 and FcMeOH + reduction reactions have been investigated in both redox-competition and FB modes .…”

“…SECM was applied to screen Ag NPs for the electrocatalytic degradation of CHCl 3 . The electrochemical activities of AuPd alloys for H 2 O 2 and FcMeOH + reduction reactions have been investigated in both redox-competition and FB modes . Scanning droplet cell microscopy (SDCM) was used to characterize various materials, including organic semiconductors, Ce-rich OER catalysts, and solar fuel photoanodes in CuO-V 2 O 5 .…”

Operando Scanning Electrochemical Probe Microscopy during Electrocatalysis

“… 546 The RC and SG-TC modes were also applied to investigate the electrochemical activities of various AuPd compositions deposited onto ITO toward H 2 O 2 and FcMeOH + reduction reactions. 547 Tomlinson et al reported the first use of electrochemical imaging to identify the defect and defect-free areas in single crystal boron-doped diamond (BDD) electrodes. Intermittent contact SG-TC-SECM was successfully used to detect defects in single crystal BDD electrodes by measuring variations in the tip current in correlation with changes in the boron dopant levels in the materials.…”

“…A Au surface was biased to generate H 2 O 2 while the selective tip was employed for imaging the distribution of H 2 O 2 . The RC and SG-TC modes were also applied to investigate the electrochemical activities of various AuPd compositions deposited onto ITO toward H 2 O 2 and FcMeOH + reduction reactions . Tomlinson et al reported the first use of electrochemical imaging to identify the defect and defect-free areas in single crystal boron-doped diamond (BDD) electrodes.…”

Bibliometric Mapping of Literature on High-Entropy/Multicomponent Alloys and Systematic Review of Emerging Applications

“…Before statistically analyzing the retrieved articles, their abstract, title, and keywords were manually screened to detect and remove any irrelevant ones. For instance, the keyword "multicomponent alloy*" retrieved many articles, such as [47][48][49][50][51][52], which did not belong to the field of HEA. Eventually, 3541 research articles were retrieved and analyzed.…”