Introduction

Chakravarthy, P.; Agilan, M.; Neethu, N.

doi:10.1201/9780367823207-1

Flux Bounded Tungsten Inert Gas Welding Process 2019

DOI: 10.1201/9780367823207-1

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Introduction

P. Chakravarthy¹,

M. Agilan²,

N. Neethu³

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Assessing tungsten-based electrodes coated with W and Ce oxides for pH sensing applications

Díaz-Ballote,

Vega-Lizama,

López

et al. 2024

J Solid State Electrochem

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This study assessed tungsten-based materials with and without dispersed CeO2 for potential use as pH sensors. Specifically, three types of tungsten electrodes were characterized: tungsten electrodes without CeO2 but with native oxide, tungsten electrodes without CeO2 that were oxidized, and a tungsten electrode containing dispersed CeO2 that was oxidized, resulting in a mixture of WO3, CeO2, and Ce2O3. The characterization was performed using SEM/EDAX, X-ray photoelectron spectroscopy (XPS), and electrochemical techniques. The oxide coatings showed higher oxygen contents compared to native tungsten. XPS confirmed the presence of a thick layer of WO3 and cerium oxides. The electrodes exhibited good reproducibility and stability in pH measurements. A linear relationship was found between the open circuit potential and pH, with slopes of 44.9, 40.8, and 46.9 mV pH−1 for native oxide, WO3, and WO3 with CeO2 and Ce2O3, respectively. The latter showed the highest sensitivity and lowest hysteresis. The response times ranged from 14.5–23.5 s and were faster in acidic solutions. Overall, the inexpensive tungsten-based electrodes demonstrated promising capabilities for pH sensing, but in particular ceriated tungsten electrodes.

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Assessing tungsten-based electrodes coated with W and Ce oxides for pH sensing applications

Díaz-Ballote,

Vega-Lizama,

López

et al. 2024

J Solid State Electrochem

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A novel perception toward welding of stainless steel by activated TIG welding: a review

Pandya¹,

Badgujar²,

Ghetiya

2020

Materials and Manufacturing Processes

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Introduction

Cited by 2 publications

References 0 publications

Assessing tungsten-based electrodes coated with W and Ce oxides for pH sensing applications

Assessing tungsten-based electrodes coated with W and Ce oxides for pH sensing applications

A novel perception toward welding of stainless steel by activated TIG welding: a review

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