双功能
析氧
电催化剂
钛铁矿
材料科学
尖晶石
纳米颗粒
催化作用
化学工程
退火(玻璃)
纳米技术
化学
电化学
冶金
矿物学
电极
有机化学
物理化学
工程类
作者
Xiaobo He,Fengxiang Yin,Yanhui Li,Hao Wang,Biaohua Chen,Yanhong Wang,Biaohua Chen
标识
DOI:10.1021/acsami.6b08101
摘要
This work develops the NiMnO3/NiMn2O4 ilmenite/spinel hybrid oxides as highly efficient bifunctional catalysts toward both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). They are prepared with the aid of pollen, using a two-step annealing method. The interaction between NiMnO3 and NiMn2O4 nanoparticles results in an enhanced charge transfer between nanoparticles and active species in electrolytes, which is favorable for their electrocatalytic activities. The surface oxidation states of Ni and Mn for the hybrid oxides can be tuned by pollen, which greatly influences the OER and ORR activities and the overall bifunctional activity. The surface Ni3+ facilitates OER activity, while the surface Mn3+ with a small amount of Mn4+ favors ORR processes. Through optimization, 0.61NiMnO3/NiMn2O4 shows the highest OER activity, while 1.57NiMnO3/NiMn2O4 can outperform the others in promoting ORR processes. Between them, 0.61NiMnO3/NiMn2O4 exhibits the higher overall bifunctional activity. Furthermore, both of the optimized hybrid oxides show excellent durability during both OER and ORR processes. They can be considered as promising bifunctional catalysts for OER/ORR.
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