알칼리 수용액에서 산소환원반응에 대한 다공성 AuCu 덴드라이트 표면의 전기화학적 특성 평가

• Published in: Biuletyn Uniejowski Vol. 54; no. 1; pp. 1 - 11
• Main Authors: 김민영(Min-Yeong Kim), 이종원(Jong Won Lee), 조수연(Soo Yeon Cho), 박다정(Da Jung Park), 정현민(Hyun Min Jung), 이주열(Joo Yul Lee), 이규환(Kyu Hwan Lee)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2021
• Subjects: 기계공학; AuCu; dendrite; alloy; oxygen reduction reaction; porous surface; etching
• ISSN: 1225-8024; 2299-8403; 2288-8403

Porous dendrite structure AuCu alloy was formed using a hydrogen bubble template (HBT) technique by electroplating to improve the catalytic performance of gold, known as an excellent oxygen reduction reaction (ORR) catalyst in alkaline medium. The rich Au surface was maximized by selectively electrochemical etching Cu on the AuCu dendrite surface well formed in a leaf shape. The catalytic activity is mainly due to the synergistic effect of Au and Cu existing on the surface and inside of the particle. Au helps desorption of OH- and Cu contributes to the activation of O2 molecule. Therefore, the porous AuCu dendrite alloy catalyst showed markedly improved catalytic activity compared to the monometallic system. The porous structure AuCu formed by the hydrogen bubble template was able to control the size of the pores according to the formation time and applied current. In addition, the Au-rich surface area increased by selectively removing Cu through electrochemical etching was measured using an electrochemical calculation method (ECSA). The results of this study suggest that the alloying of porous AuCu dendrites and selective Cu dissolution treatment induces an internal alloying effect and a large specific surface area to improve catalyst performance.