Bifunctional hydrous RuO 2 nanocluster electrocatalyst embedded in carbon matrix for efficient and durable operation of rechargeable zinc-air batteries

Han Saem Park, Eunyong Seo, Juchan Yang, Yeongdae Lee, Byeong-Su Kim, Hyun Kon Song

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Ruthenium oxide (RuO 2 ) is the best oxygen evolution reaction (OER) electrocatalyst. Herein, we demonstrated that RuO 2 can be also efficiently used as an oxygen reduction reaction (ORR) electrocatalyst, thereby serving as a bifunctional material for rechargeable Zn-air batteries. We found two forms of RuO 2 (i.e. hydrous and anhydrous, respectively h-RuO 2 and ah-RuO 2 ) to show different ORR and OER electrocatalytic characteristics. Thus, h-RuO 2 required large ORR overpotentials, although it completed the ORR via a 4e process. In contrast, h-RuO 2 triggered the OER at lower overpotentials at the expense of showing very unstable electrocatalytic activity. To capitalize on the advantages of h-RuO 2 while improving its drawbacks, we designed a unique structure (RuO 2 @C) where h-RuO 2 nanoparticles were embedded in a carbon matrix. A double hydrophilic block copolymer-templated ruthenium precursor was transformed into RuO 2 nanoparticles upon formation of the carbon matrix via annealing. The carbon matrix allowed overcoming the limitations of h-RuO 2 by improving its poor conductivity and protecting the catalyst from dissolution during OER. The bifunctional RuO 2 @C catalyst demonstrated a very low potential gap (ΔE OER-ORR = ca. 1.0 V) at 20 mA cm -2 . The Zn||RuO 2 @C cell showed an excellent stability (i.e. no overpotential was observed after more than 40 h).

Original languageEnglish
Article number7150
JournalScientific reports
Volume7
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1

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Electrocatalysts
Nanoclusters
Zinc
Carbon
Oxygen
Air
Ruthenium
Nanoparticles
Catalysts
Oxides
Block copolymers
Dissolution
Annealing

All Science Journal Classification (ASJC) codes

  • General

Cite this

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title = "Bifunctional hydrous RuO 2 nanocluster electrocatalyst embedded in carbon matrix for efficient and durable operation of rechargeable zinc-air batteries",
abstract = "Ruthenium oxide (RuO 2 ) is the best oxygen evolution reaction (OER) electrocatalyst. Herein, we demonstrated that RuO 2 can be also efficiently used as an oxygen reduction reaction (ORR) electrocatalyst, thereby serving as a bifunctional material for rechargeable Zn-air batteries. We found two forms of RuO 2 (i.e. hydrous and anhydrous, respectively h-RuO 2 and ah-RuO 2 ) to show different ORR and OER electrocatalytic characteristics. Thus, h-RuO 2 required large ORR overpotentials, although it completed the ORR via a 4e process. In contrast, h-RuO 2 triggered the OER at lower overpotentials at the expense of showing very unstable electrocatalytic activity. To capitalize on the advantages of h-RuO 2 while improving its drawbacks, we designed a unique structure (RuO 2 @C) where h-RuO 2 nanoparticles were embedded in a carbon matrix. A double hydrophilic block copolymer-templated ruthenium precursor was transformed into RuO 2 nanoparticles upon formation of the carbon matrix via annealing. The carbon matrix allowed overcoming the limitations of h-RuO 2 by improving its poor conductivity and protecting the catalyst from dissolution during OER. The bifunctional RuO 2 @C catalyst demonstrated a very low potential gap (ΔE OER-ORR = ca. 1.0 V) at 20 mA cm -2 . The Zn||RuO 2 @C cell showed an excellent stability (i.e. no overpotential was observed after more than 40 h).",
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Bifunctional hydrous RuO 2 nanocluster electrocatalyst embedded in carbon matrix for efficient and durable operation of rechargeable zinc-air batteries . / Park, Han Saem; Seo, Eunyong; Yang, Juchan; Lee, Yeongdae; Kim, Byeong-Su; Song, Hyun Kon.

In: Scientific reports, Vol. 7, No. 1, 7150, 01.12.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Bifunctional hydrous RuO 2 nanocluster electrocatalyst embedded in carbon matrix for efficient and durable operation of rechargeable zinc-air batteries

AU - Park, Han Saem

AU - Seo, Eunyong

AU - Yang, Juchan

AU - Lee, Yeongdae

AU - Kim, Byeong-Su

AU - Song, Hyun Kon

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Ruthenium oxide (RuO 2 ) is the best oxygen evolution reaction (OER) electrocatalyst. Herein, we demonstrated that RuO 2 can be also efficiently used as an oxygen reduction reaction (ORR) electrocatalyst, thereby serving as a bifunctional material for rechargeable Zn-air batteries. We found two forms of RuO 2 (i.e. hydrous and anhydrous, respectively h-RuO 2 and ah-RuO 2 ) to show different ORR and OER electrocatalytic characteristics. Thus, h-RuO 2 required large ORR overpotentials, although it completed the ORR via a 4e process. In contrast, h-RuO 2 triggered the OER at lower overpotentials at the expense of showing very unstable electrocatalytic activity. To capitalize on the advantages of h-RuO 2 while improving its drawbacks, we designed a unique structure (RuO 2 @C) where h-RuO 2 nanoparticles were embedded in a carbon matrix. A double hydrophilic block copolymer-templated ruthenium precursor was transformed into RuO 2 nanoparticles upon formation of the carbon matrix via annealing. The carbon matrix allowed overcoming the limitations of h-RuO 2 by improving its poor conductivity and protecting the catalyst from dissolution during OER. The bifunctional RuO 2 @C catalyst demonstrated a very low potential gap (ΔE OER-ORR = ca. 1.0 V) at 20 mA cm -2 . The Zn||RuO 2 @C cell showed an excellent stability (i.e. no overpotential was observed after more than 40 h).

AB - Ruthenium oxide (RuO 2 ) is the best oxygen evolution reaction (OER) electrocatalyst. Herein, we demonstrated that RuO 2 can be also efficiently used as an oxygen reduction reaction (ORR) electrocatalyst, thereby serving as a bifunctional material for rechargeable Zn-air batteries. We found two forms of RuO 2 (i.e. hydrous and anhydrous, respectively h-RuO 2 and ah-RuO 2 ) to show different ORR and OER electrocatalytic characteristics. Thus, h-RuO 2 required large ORR overpotentials, although it completed the ORR via a 4e process. In contrast, h-RuO 2 triggered the OER at lower overpotentials at the expense of showing very unstable electrocatalytic activity. To capitalize on the advantages of h-RuO 2 while improving its drawbacks, we designed a unique structure (RuO 2 @C) where h-RuO 2 nanoparticles were embedded in a carbon matrix. A double hydrophilic block copolymer-templated ruthenium precursor was transformed into RuO 2 nanoparticles upon formation of the carbon matrix via annealing. The carbon matrix allowed overcoming the limitations of h-RuO 2 by improving its poor conductivity and protecting the catalyst from dissolution during OER. The bifunctional RuO 2 @C catalyst demonstrated a very low potential gap (ΔE OER-ORR = ca. 1.0 V) at 20 mA cm -2 . The Zn||RuO 2 @C cell showed an excellent stability (i.e. no overpotential was observed after more than 40 h).

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