Transition metal oxide is widely used as a water electrolysis catalyst to substitute for a noble metal catalyst such as IrO2 and RuO2. In this study, the sol-gel method is used to synthesize the CuxCo3-xO4 catalyst for the oxygen evolution reaction (OER),. The CuxCo3-xO4 is synthesized at various calcination temperatures from 250 ℃ to 400 ℃ for 4 h. The CuxCo3- xO4 synthesized at 300 ℃ has a perfect spinel structure without residues of the precursor and secondary phases, such as CuO. The particle size of CuxCo3-xO4 increases with an increase in calcination temperature. Amongst all the samples studied, CuxCo3- xO4, which is synthesized at 300?, has the highest activity for the OER. Its onset potential for the OER is 370 mV and the overpotential at 10 mA/cm2 is 438 mV. The tafel slope of CuxCo3-xO4 synthesized at 300 ℃ has a low value of 58 mV/dec. These results are mainly explained by the increase in the available active surface area of the CuxCo3-xO4 catalyst.

Abstracts
 1. 서 론
 2. 실험 방법
 3. 결과 및 고찰
 4. 결 론
 References

• 박유세(부산대학교 공과대학 재료공학과) | Yoo Sei Park (School of Materials Science and Engineering, Pusan National University)
• 정창욱(부산대학교 공과대학 재료공학과) | Changwook Jung (School of Materials Science and Engineering, Pusan National University)
• 김치호(부산대학교 공과대학 재료공학과) | Chiho Kim (School of Materials Science and Engineering, Pusan National University)
• 구태우(부산대학교 공과대학 재료공학과) | Taewoo Koo (School of Materials Science and Engineering, Pusan National University)
• 석창규(부산대학교 공과대학 재료공학과) | Changgyu Seok (School of Materials Science and Engineering, Pusan National University)
• 권일영(부산대학교 공과대학 재료공학과) | Ilyeong Kwon (School of Materials Science and Engineering, Pusan National University)
• 김양도(부산대학교 공과대학 재료공학과) | Yangdo Kim (School of Materials Science and Engineering, Pusan National University) Corresponding author