Electrochemical studies of molten sulfates in LiCl-KCl-Na2SO4 at 700 °C

Kuldeep Kumar; Nathan D. Smith; Timothy Lichtenstein; Hojong Kim

doi:10.1016/j.corsci.2017.12.022

Electrochemical studies of molten sulfates in LiCl-KCl-Na₂SO₄ at 700 °C

Kuldeep Kumar, Nathan D. Smith, Timothy Lichtenstein, Hojong Kim

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

The electrochemical reduction behavior of molten Na₂SO₄ was investigated at 700 °C in LiCl-KCl-Na₂SO₄ (5–15 mol%) electrolyte under two different gaseous atmospheres of inert argon and oxidizing O₂-0.1% SO₂. Sulfate ions (SO₄^2–) were directly reduced into sulfur (S) and sulfide (S^2–) ions at large negative overpotentials in both gaseous atmospheres. During the transition from inert to oxidizing atmosphere, open circuit potentials of a platinum electrode (vs. Ag/Ag⁺) were shifted in the positive direction by more than 0.60 V, implying the presence of stronger oxidants which can be coupled with the metal oxidation reactions during the hot corrosion processes.

Original language	English (US)
Pages (from-to)	17-24
Number of pages	8
Journal	Corrosion Science
Volume	133
DOIs	https://doi.org/10.1016/j.corsci.2017.12.022
State	Published - Apr 1 2018

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
General Materials Science

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10.1016/j.corsci.2017.12.022

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title = "Electrochemical studies of molten sulfates in LiCl-KCl-Na2SO4 at 700 °C",

abstract = "The electrochemical reduction behavior of molten Na2SO4 was investigated at 700 °C in LiCl-KCl-Na2SO4 (5–15 mol%) electrolyte under two different gaseous atmospheres of inert argon and oxidizing O2-0.1% SO2. Sulfate ions (SO42–) were directly reduced into sulfur (S) and sulfide (S2–) ions at large negative overpotentials in both gaseous atmospheres. During the transition from inert to oxidizing atmosphere, open circuit potentials of a platinum electrode (vs. Ag/Ag+) were shifted in the positive direction by more than 0.60 V, implying the presence of stronger oxidants which can be coupled with the metal oxidation reactions during the hot corrosion processes.",

author = "Kuldeep Kumar and Smith, {Nathan D.} and Timothy Lichtenstein and Hojong Kim",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

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T1 - Electrochemical studies of molten sulfates in LiCl-KCl-Na2SO4 at 700 °C

AU - Kumar, Kuldeep

AU - Smith, Nathan D.

AU - Lichtenstein, Timothy

AU - Kim, Hojong

PY - 2018/4/1

Y1 - 2018/4/1

N2 - The electrochemical reduction behavior of molten Na2SO4 was investigated at 700 °C in LiCl-KCl-Na2SO4 (5–15 mol%) electrolyte under two different gaseous atmospheres of inert argon and oxidizing O2-0.1% SO2. Sulfate ions (SO42–) were directly reduced into sulfur (S) and sulfide (S2–) ions at large negative overpotentials in both gaseous atmospheres. During the transition from inert to oxidizing atmosphere, open circuit potentials of a platinum electrode (vs. Ag/Ag+) were shifted in the positive direction by more than 0.60 V, implying the presence of stronger oxidants which can be coupled with the metal oxidation reactions during the hot corrosion processes.

AB - The electrochemical reduction behavior of molten Na2SO4 was investigated at 700 °C in LiCl-KCl-Na2SO4 (5–15 mol%) electrolyte under two different gaseous atmospheres of inert argon and oxidizing O2-0.1% SO2. Sulfate ions (SO42–) were directly reduced into sulfur (S) and sulfide (S2–) ions at large negative overpotentials in both gaseous atmospheres. During the transition from inert to oxidizing atmosphere, open circuit potentials of a platinum electrode (vs. Ag/Ag+) were shifted in the positive direction by more than 0.60 V, implying the presence of stronger oxidants which can be coupled with the metal oxidation reactions during the hot corrosion processes.

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JO - Corrosion Science

JF - Corrosion Science

ER -

Electrochemical studies of molten sulfates in LiCl-KCl-Na₂SO₄ at 700 °C

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Electrochemical studies of molten sulfates in LiCl-KCl-Na2SO4 at 700 °C

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Electrochemical studies of molten sulfates in LiCl-KCl-Na₂SO₄ at 700 °C