In-situ Thermoelectrochemistry

Abstract

Surprisingly, a large number of important topics in electrochemistry is not covered by up-to-date monographs and series on the market, some topics are even not covered at all. The series Monographs in Electrochemistry fills this gap by publishing indepth monographs written by experienced and distinguished electrochemists, covering both theory and applications. The focus is set on existing as well as emerging methods for researchers, engineers, and practitioners active in the many and often interdisciplinary fields, where electrochemistry plays a key role. These fields will range -among others -from analytical and environmental sciences to sensors, materials sciences and biochemical research.

Thermoelectrochemistry of Paracetamol – Studied at Directly Heated Micro‐wire and Rotating Disk Electrodes

“…That particular temperature difference of 30 K was also found in our measurements as depicted in Arrhenius plots in Figure C, D. There we obtained activation energy levels (14.5 and 16.2 kJ/mol at pH 7.4 and pH 1, respectively) that are still typical for diffusion processes, although higher than the values observed at the RDE (9.9 and 13.3 kJ/mol). One difference that could play a role is the possible influence due to the Soret effect that plays an increasing role at higher temperature gradients that are found around a heated electrode , but not at a RDE in an isothermal electrochemical cell. A gradient for flow velocity was proposed that showed a maximum speed at ca.…”

Development of a Temperature‐pulse Enhanced Electrochemical Glucose Biosensor and Characterization of its Stability via Scanning Electrochemical Microscopy

“…Drop‐coating of GOx was performed with a sciFlexArrayer S3 (Scienion, Berlin, Germany). Heating of substrates was achieved with a laboratory‐built AC source already used in a previous study [7] and fabricated according to [24]. The AC source consisted of a radio frequency generator and a transformer, yielding a 100 kHz AC.…”

“…We assume that this is a result of different temperature gradients for the respective cases. In the works of Gründler [24], it was simulated that 20 ms pulses with a heating current of 725 mA led to a temperature gradient of a thickness of more than 100 μm. Under the present experimental conditions, the area around the wire that seemed affected by the heat pulse (600 mA, 100 ms) was of similar size.…”

Scanning Electrochemical Microscopy of Electrically Heated Wire Substrates

“…Heating intensity could be adjusted by an arbitrary percentage value corresponding to a certain voltage amplitude applied. The heating device was laboratory-built, and mainly consisted of a radio frequency generator and a radio frequency transformer, based on the constructions proposed by Gründler [13]. The working electrode channel of the bipotentiostat, which was used for measurements directly at the heated wire, was connected to the wire heating device, enabling voltammetric measurements without interference from heating AC.…”

“…A convenient way of heating electrodes is the application of an alternating current (≥100 kHz) to microwires. This technique, based on the work of Gründler et al, is termed "hot-wire electrochemistry" [13,14]. Usually, gold or platinum microwires with a diameter of about 25 µm are employed as cylindrical electrodes in corresponding hot-wire configurations.…”