title: NiMnO3/NiMn2O4Oxides Synthesized via the Aid of Pollen: Ilmenite/Spinel Hybrid Nanoparticles for Highly Efficient Bifunctional Oxygen Electrocatalysis.
abstract: This work develops the NiMnO3/NiMn2O4ilmenite/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 NiMnO3and NiMn2O4nanoparticles 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/NiMn2O4shows the highest OER activity, while 1.57NiMnO3/NiMn2O4can outperform the others in promoting ORR processes. Between them, 0.61NiMnO3/NiMn2O4exhibits 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.
authors.affiliation: Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University , Changzhou 213164, Jiangsu, People's Republic of China.|Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology , Changzhou 213164, Jiangsu, People's Republic of China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: He
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.|Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University , Changzhou 213164, Jiangsu, People's Republic of China.|Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology , Changzhou 213164, Jiangsu, People's Republic of China.
authors.forename: Fengxiang
authors.initials: F
authors.lastname: Yin
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Li
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.|College of Chemical Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
authors.forename: Hao
authors.initials: H
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
authors.forename: Jinnan
authors.initials: J
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
authors.forename: Yanhong
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Chemical Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
authors.forename: Biaohua
authors.initials: B
authors.lastname: Chen
keywords: electrocatalysis; hybrid oxides; oxygen evolution reaction; oxygen reduction reaction; pollen