과량의 니켈 첨가로 합성된 NiO와 Co 3 O 4 가 도핑된 La(CoNi)O 3 페로브스 카이트의 알칼리용액에서 산소환원 및 발생반응 특성

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 32; no. 1; pp. 41 - 52
• Main Authors: 버링, 임형렬, 이홍기, 박경세, 심중표, BO, LING, RIM, HYUNG-RYUL, LEE, HONG-KI, PARK, GYUNGSE, SHIM, JOONGPYO
• Format: Journal Article
• Language: Korean
• Published: 2021
• ISSN: 1738-7264

NiO and Co3O4-doped porous La(CoNi)O3 perovskite oxides were prepared from excess Ni addition by a hydrothermal method using porous silica template, and characterized as bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) for Zn-air rechargeable batteries in alkaline solution. Excess Ni induced to form NiO and Co3O4 in La(CoNi)O3 particles. The NiO and Co3O4-doped porous La(CoNi)O3 showed high specific surface area, up to nine times of conventionally synthesized perovskite oxide, and abundant pore volume with similar structure. Extra added Ni was partially substituted for Co as B site of ABO3 perovskite structure and formed to NiO and Co3O4 which was highly dispersed in particles. Excess Ni in La(CoNi)O3 catalysts increased OER performance (259 mA/㎠ at 2.4 V) in alkaline solution, although the activities (211 mA/㎠ at 0.5 V) for ORR were not changed with the content of excess Ni. La(CoNi)O3 with excess Ni showed very stable cyclability and low capacity fading rate (0.38 & 0.07 ㎶/hour for ORR & OER) until 300 hours (~70 cycles) but more excess content of Ni in La(CoNi)O3 gave negative effect to cyclability.