Journal of the Microelectronics and Packaging Society (마이크로전자및패키징학회지)

The Korean Microelectronics and Packaging Society (한국마이크로전자및패키징학회)
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Low-iridium Doped Single-crystalline Hydrogenated Titanates (H2Ti3O7) with Large Exposed {100} Facets for Enhanced Oxygen Evolution Reaction under Acidic Conditions

{100} 단결정 수소화 티타네이트(H2Ti3O7)를 활용한 저함량 Irridium 수전해 양극 촉매 개발

  • Sun Young Jung (Department of Energy Engineering, Konkuk University) ;
  • HyukSu Han (Department of Energy Engineering, Konkuk University)
  • 정선영 (건국대학교 미래에너지공학과) ;
  • 한혁수 (건국대학교 미래에너지공학과)
  • Received : 2023.03.23
  • Accepted : 2023.03.30
  • Published : 2023.03.30
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Abstract

Development of efficient and stable electrocatalysts for oxygen evolution reaction (OER) under acidic conditions is desirable goal for commercializing proton exchange membrane (PEM) water electroyzer. Herein, we report iridium-doped hydrogenated titanate (Ir-HTO) nanobelts as a promising catalyst with a low-Ir content for the acidic OER. Addition of low-Ir (~ 3.36 at%) into the single-crystalline HTO nanobelts with large exposed {100} facets significantly boost catalytic activity and stability for OER under acidic conditions. The Ir-HTO outperforms the commenrcial benchmark IrO2 catalyst; an overpotential for delivering 10 mA cm-2 current density was reduced to about 25% for the Ir-HTO. Moreover, the catalytic performance of Ir-HTO is positioned as the most efficient electrocatalyst for the acidic OER. An improved intrinsic catalytic activity and stability are also confirmed for the Ir-HTO through in-depth electrochemical characterizations. Therefore, our results suggest that low-Ir doped single-crystalline HTO nanobelts can be a promising catalyst for efficient and durable OER under acidic conditions.

산성 조건에서의 산소 발생 반응(OER)의 효율 향상 및 안정적인 전기 촉매 개발은 양이온 교환 막 (PEM) 수전해 장치의 상용화를 위한 바람직한 목표다. 여기서 우리는 산성 OER에 대해 Ir 함량이 낮은 유망한 촉매로서 Ir이 도핑된 수소화 티타네이트 (Ir-HTO) 나노벨트를 보고한다. 크게 확인할 수 있는 {100}면이 있는 단결정 HTO 나노벨트에 낮은 함량의 Ir(~3.36 at %)을 추가하면 산성 조건에서 OER에 대한 촉매 활성과 안정성이 크게 향상된다. Ir-HTO는 상용적인 대조군 IrO2 촉매보다 성능이 뛰어나다. 10mA cm-2의 전류밀도에서 과전압은 Ir-HTO가 25% 감소했다. Ir-HTO 촉매 성능은 산성 OER에 대한 가장 효율적인 전기 촉매로서 자리 잡고 있다. 심층적인 전기화학적 특성화를 통해 Ir-HTO에 대해 개선된 고유한 촉매 활성 및 안정성도 확인되었다. 따라서, 우리의 실험결과는 낮은 함량의 Ir이 도핑된 단결정 HTO 나노벨트가 산성조건에서 효율적이고 내구성 있는 OER 촉매로 유망 될 수 있음을 보여준다.

Keywords

Acknowledgement

본 연구는 미래창조과학부의 한국연구재단 기초과학연구사업 (2021R1A2C2091497 및 2022R1A2C2010162)의 지원을 받아 진행되었다. 이 연구의 일부는 교육부 (2022RIS005)의 지원을 받는 한국연구재단(NRF)의 "지역혁신전략(RIS)"의 지원도 받았다. 이 연구의 일부는 산업통상자원부의 지원을 받았다 (20018145).

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