Ru-doped barium strontium titanates of the cathode for the electrochemical synthesis of ammonia

Hwan Kim; Yong Sik Chung; Taewook Kim; Heechul Yoon; Jae Gi Sung; Han Kyu Jung; Won Bae Kim; Lauren Beverly Sammes; Jong Shik Chung

doi:10.1016/j.ssi.2019.115010

Ru-doped barium strontium titanates of the cathode for the electrochemical synthesis of ammonia

Hwan Kim, Yong Sik Chung, Taewook Kim, Heechul Yoon, Jae Gi Sung, Han Kyu Jung, Won Bae Kim, Lauren Beverly Sammes, Jong Shik Chung

Department of Energy Chemical Engineering

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

22 Scopus citations

Abstract

Ru-doped barium strontium titanate (BSTR) perovskites (Ba_0.5Sr_0.5Ti_1-xRu_xO_3-δ, x = 0, 0.05, 0.1) (BSTR) were evaluated as cathode materials for the electrochemical synthesis of ammonia from wet H₂ and dry N₂. Phase crystallinity and the electrochemical properties of BSTR were analyzed. The BSTR structure is stable in low oxygen partial pressure, possibly as a result of its cubic nature. Doping Ru on the B-site of the BST improves its electrochemical properties, because increasing replacement of Ti⁴⁺ by Ru⁴⁺ causes a decrease in ohmic resistance. Introduction of Ru⁴⁺ ions on the B-site of the BST increased catalytic activity for the ammonia synthesis reaction. An electrochemical cell using BSTR as the cathode (Ni/BaCe_0.4Zr_0.4Y_0.2O₃ (BCZY)/BCZY/BSTR) exhibits a maximum ammonia formation rate of 1.1 × 10⁻⁹ mol s⁻¹ cm⁻² and a Faradaic efficiency of 5.9% at 500 °C under an applied voltage of 1.2 V; short-term stability tests showed high stability.

Original language	English
Article number	115010
Journal	Solid State Ionics
Volume	339
DOIs	https://doi.org/10.1016/j.ssi.2019.115010
State	Published - 15 Oct 2019

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@article{53220e87b49041a8825266cec88e1524,

title = "Ru-doped barium strontium titanates of the cathode for the electrochemical synthesis of ammonia",

abstract = "Ru-doped barium strontium titanate (BSTR) perovskites (Ba0.5Sr0.5Ti1-xRuxO3-δ, x = 0, 0.05, 0.1) (BSTR) were evaluated as cathode materials for the electrochemical synthesis of ammonia from wet H2 and dry N2. Phase crystallinity and the electrochemical properties of BSTR were analyzed. The BSTR structure is stable in low oxygen partial pressure, possibly as a result of its cubic nature. Doping Ru on the B-site of the BST improves its electrochemical properties, because increasing replacement of Ti4+ by Ru4+ causes a decrease in ohmic resistance. Introduction of Ru4+ ions on the B-site of the BST increased catalytic activity for the ammonia synthesis reaction. An electrochemical cell using BSTR as the cathode (Ni/BaCe0.4Zr0.4Y0.2O3 (BCZY)/BCZY/BSTR) exhibits a maximum ammonia formation rate of 1.1 × 10−9 mol s−1 cm−2 and a Faradaic efficiency of 5.9% at 500 °C under an applied voltage of 1.2 V; short-term stability tests showed high stability.",

author = "Hwan Kim and Chung, {Yong Sik} and Taewook Kim and Heechul Yoon and Sung, {Jae Gi} and Jung, {Han Kyu} and Kim, {Won Bae} and Sammes, {Lauren Beverly} and Chung, {Jong Shik}",

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year = "2019",

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doi = "10.1016/j.ssi.2019.115010",

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T1 - Ru-doped barium strontium titanates of the cathode for the electrochemical synthesis of ammonia

AU - Kim, Hwan

AU - Chung, Yong Sik

AU - Kim, Taewook

AU - Yoon, Heechul

AU - Sung, Jae Gi

AU - Jung, Han Kyu

AU - Kim, Won Bae

AU - Sammes, Lauren Beverly

AU - Chung, Jong Shik

PY - 2019/10/15

Y1 - 2019/10/15

N2 - Ru-doped barium strontium titanate (BSTR) perovskites (Ba0.5Sr0.5Ti1-xRuxO3-δ, x = 0, 0.05, 0.1) (BSTR) were evaluated as cathode materials for the electrochemical synthesis of ammonia from wet H2 and dry N2. Phase crystallinity and the electrochemical properties of BSTR were analyzed. The BSTR structure is stable in low oxygen partial pressure, possibly as a result of its cubic nature. Doping Ru on the B-site of the BST improves its electrochemical properties, because increasing replacement of Ti4+ by Ru4+ causes a decrease in ohmic resistance. Introduction of Ru4+ ions on the B-site of the BST increased catalytic activity for the ammonia synthesis reaction. An electrochemical cell using BSTR as the cathode (Ni/BaCe0.4Zr0.4Y0.2O3 (BCZY)/BCZY/BSTR) exhibits a maximum ammonia formation rate of 1.1 × 10−9 mol s−1 cm−2 and a Faradaic efficiency of 5.9% at 500 °C under an applied voltage of 1.2 V; short-term stability tests showed high stability.

AB - Ru-doped barium strontium titanate (BSTR) perovskites (Ba0.5Sr0.5Ti1-xRuxO3-δ, x = 0, 0.05, 0.1) (BSTR) were evaluated as cathode materials for the electrochemical synthesis of ammonia from wet H2 and dry N2. Phase crystallinity and the electrochemical properties of BSTR were analyzed. The BSTR structure is stable in low oxygen partial pressure, possibly as a result of its cubic nature. Doping Ru on the B-site of the BST improves its electrochemical properties, because increasing replacement of Ti4+ by Ru4+ causes a decrease in ohmic resistance. Introduction of Ru4+ ions on the B-site of the BST increased catalytic activity for the ammonia synthesis reaction. An electrochemical cell using BSTR as the cathode (Ni/BaCe0.4Zr0.4Y0.2O3 (BCZY)/BCZY/BSTR) exhibits a maximum ammonia formation rate of 1.1 × 10−9 mol s−1 cm−2 and a Faradaic efficiency of 5.9% at 500 °C under an applied voltage of 1.2 V; short-term stability tests showed high stability.

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JF - Solid State Ionics

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Ru-doped barium strontium titanates of the cathode for the electrochemical synthesis of ammonia

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