Ultrafine cobalt oxide nanosheets for enhanced high activity towards oxygen evolution reaction
Ultrafine cobalt oxide nanosheets for enhanced high activity towards oxygen evolution reaction
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DOI：
10.1016/j.catcom.2022.106520
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发表时间：
2022-09
影响因子：
3.7
通讯作者：
C. Song;Hubin Luo;Xuliang Duan;Yun Li;Yujin Li;Yinhang Yang;Jian Wu;Fang Wang;Fanbin Meng;Jian Zhang
中科院分区：
文献类型：
--
作者：
C. Song;Hubin Luo;Xuliang Duan;Yun Li;Yujin Li;Yinhang Yang;Jian Wu;Fang Wang;Fanbin Meng;Jian Zhang
制备了尺寸约为2.7 nm的氧化钴纳米片。采用适当的退火温度（200℃~ 400℃）控制室温下CoO纳米片由高比立方相转化为高比六方相。分析表明，六方相比立方相更适合CoO纳米片的析氧反应。高比例六方相超细CoO纳米片在1.615 V时的质量活性为5597Ag−1，是贵金属Ru簇电催化剂的22.8倍。本研究为合成高质量活性纳米片催化剂提供了一条有效途径。
Cobalt oxide (CoO) nanosheets with a size of about 2.7 nm are prepared. The proper annealing temperatures (200 °C–400 °C) are used to control the conversion of CoO nanosheets to high-ratio hexagonal phases from high-ratio cubic phases at room temperature. The analysis revealed the hexagonal phase is preferable to cubic phase for oxygen evolution reaction of CoO nanosheets. The ultrafine CoO nanosheets with high-ratio hexagonal phases showed a particularly high mass activity of 5597Ag−1at 1.615 V, 22.8 times higher than that of the noble metal Ru cluster electrocatalyst. Our study indicates an effective way to synthesize nanosheet catalysts with high mass activity.