Single Pt Nanowire Electrode: Preparation, Electrochemistry, and Electrocatalysis

Abstract

A single Pt nanowire electrode (SPNE) was fabricated through HF etching process from Pt disk nanoelectrode and an underpotential deposition (UPD) redox replacement technique. The electrochemical experiments showed that SPNE had steady-state electrochemical responses at redox species solution and the mass transfer rates were affected by the lengths and radii of SPNEs. The prepared SPNEs were utilized to examine the oxygen-reduction reaction in a KOH solution to explore the feasibility of electrocatalytic activity of single Pt nanowire and the results showed that the electrocatalytic activity of SPNE was dependent on the surface position of single Pt nanowire: the tip end position is more active than the sidewall position. Meanwhile, the electrocatalytic activity of SPNE was related to the radius of nanowire. These observations are not only important to understand the structure-function relationship in single nanowire level but have significant implications for the synthesis and selection of novel catalysts with high efficiency used in electrochemistry, energy, bioanalysis, etc.

Fabrication of single Pt@Au nanowire electrodes for monitoring hydrogen peroxide released from living cells

“…The length of the single Pt@AuNWEs can be estimated from steady-state limiting current obtained from the cyclic voltammetry (CV) of redox species 13,30 and also can be obtained from nite simulation results. 31…”

On “resistance overpotential” caused by a potential drop along the ultrathin high aspect ratio gold nanowire electrodes in cyclic voltammetry

“…Although ultrathin NW electrodes with lengths in the nm [44] can be used, the advantage of high aspect ratio network is not utilized in such applications.…”

Fabrication of Graphene Coated Carbon Fiber Microelectrode for Highly Sensitive Detection Application

“…K3Fe(CN)6 is usually used as an electrochemical probe to detect the voltammetric behavior or the activity of the microelectrode-type systems, 25,26 including carbon fiber electrodes. 22,27 Here, the electrochemical characterization of the G-CFM was tested by using K3Fe(CN)6 in the aqueous solution and compared with that of CFM.…”

“…5B), which indicates that a high ratio of length to radius of the electrode results in the diffusion field mainly contributed by sidewall surface and thus the same mass transfer rate. 25 Next, the influence of the time for potentiostaticly reduced deposition of graphene oxide on carbon fiber on the voltammetric response was investigated. The voltammetric responses of G-CFMs fabricated with different deposition times of graphene on the carbon fiber were carried out in the aqueous solution containing 1 mM K3Fe(CN)6.…”