음이온교환막 수전해를 위한 3원계 층상 이중 수산화물 산소 발생 반응 촉매 개발 (Development of Ternary Layered Double Hydroxide Oxygen Evolution Reaction Electrocatalyst for Anion Exchange Membrane Water Electrolysis)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 62권 / 6호 / 472 ~ 479페이지
· 저자명 : 명신우, 진송, 김치호, 이주영, 김양도, 최승목

초록

To achieve net zero emissions, green hydrogen should be produced via water electrolysis withrenewable energy. To develop efficient anion exchange membrane water electrolyzers (AEMWE), thedevelopment of efficient and stable non-precious metal electrocatalysts for the oxygen evolution reaction(OER) is essential. In this study, a high-performance ternary NiFeCo-layer double hydroxide (LDH)electrocatalyst for AEMWE was easily developed by the co-precipitation method. The introduction of Co hasbeen shown to have an effect on the electronic structure of Ni and Fe, improving their intrinsic OERproperties. In addition, the three-dimensional flower-like nanosheet morphology improved mass transfer andachieved excellent current density at high voltages. The ternary NiFeCo-LDH electrocatalyst requires lowoverpotentials (253 mV at 10 mA cm-2) and Tafel slope (45 mV dec-1) in 1 M KOH. AEMWE using the ternaryNiFeCo-LDH electrocatalyst showed excellent electrolysis performance with a high current density of 2.27 A cm-2 at1.8 V cell. Moreover, an energy conversion efficiency of 86.73 % was achieved during the durability test for100 hours at a current density of 0.5 A cm-2. The performance of the AEMWE electrolyzer utilizing the ternaryNiFeCo-LDH electrocatalyst surpassed that of previously reported AEMWE electrolyzers. This work reportsa highly active OER electrocatalyst that could open numerous opportunities for the development of ternaryLDH electrocatalysts in AEMWE.

영어초록

To achieve net zero emissions, green hydrogen should be produced via water electrolysis withrenewable energy. To develop efficient anion exchange membrane water electrolyzers (AEMWE), thedevelopment of efficient and stable non-precious metal electrocatalysts for the oxygen evolution reaction(OER) is essential. In this study, a high-performance ternary NiFeCo-layer double hydroxide (LDH)electrocatalyst for AEMWE was easily developed by the co-precipitation method. The introduction of Co hasbeen shown to have an effect on the electronic structure of Ni and Fe, improving their intrinsic OERproperties. In addition, the three-dimensional flower-like nanosheet morphology improved mass transfer andachieved excellent current density at high voltages. The ternary NiFeCo-LDH electrocatalyst requires lowoverpotentials (253 mV at 10 mA cm-2) and Tafel slope (45 mV dec-1) in 1 M KOH. AEMWE using the ternaryNiFeCo-LDH electrocatalyst showed excellent electrolysis performance with a high current density of 2.27 A cm-2 at1.8 V cell. Moreover, an energy conversion efficiency of 86.73 % was achieved during the durability test for100 hours at a current density of 0.5 A cm-2. The performance of the AEMWE electrolyzer utilizing the ternaryNiFeCo-LDH electrocatalyst surpassed that of previously reported AEMWE electrolyzers. This work reportsa highly active OER electrocatalyst that could open numerous opportunities for the development of ternaryLDH electrocatalysts in AEMWE.

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