Electron modulation and morphology engineering jointly accelerate oxygen reaction to enhance Zn-Air battery performance

Zhao, Xue (author): National Engineering Research Center for Marine Aquaculture, Marine Science and Technology College, Zhejiang Ocean University, Zhoushan, China

Chen, Jianbing (author): Research Academy of Non-metallic Mining Industry Development, Materials and Environmental Engineering College, Chizhou University, Chizhou, China

Bi, Zenghui (author): Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming, China

Chen, Songqing (author): School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, China

Feng, Ligang (author): School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, China

Zhou, Xiaohai (author): College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, China

Zhang, Haibo (author): College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, China

Zhou, Yingtang (author): National Engineering Research Center for Marine Aquaculture, Marine Science and Technology College, Zhejiang Ocean University, Zhoushan, China

Hu, Guangzhi (author): Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming, China

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Abstract Subject headings

Combining morphological control engineering and diatomic coupling strategies, heteronuclear Fe-Co bimetals are efficiently intercalated into nitrogen-doped carbon materials with star-like to simultaneously accelerate oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The half-wave potential and kinetic current density of the ORR driven by FeCoNC/SL surpass the commercial Pt/C catalyst. The overpotential of OER is as low as 316 mV (η10), and the mass activity is at least 3.2 and 9.4 times that of mononuclear CoNC/SL and FeNC/SL, respectively. The power density and specific capacity of the Zn-air battery with FeCoNC/SL as air cathode are as high as 224.8 mW cm−2 and 803 mAh g−1, respectively. Morphologically, FeCoNC/SL endows more reactive sites and accelerates the process of oxygen reaction. Density functional theory reveals the active site of the heteronuclear diatomic, and the formation of FeCoN5C configuration can effectively tune the d-band center and electronic structure. The redistribution of electrons provides conditions for fast electron exchange, and the change of the center of the d-band avoids the strong adsorption of intermediate species to simultaneously take into account both ORR and OER and thus achieve high-performance Zn-air batteries.

By the author/editor: Zhao, Xue; Chen, Jianbing; Bi, Zenghui; Chen, Songqing; Feng, Ligang; Zhou, Xiaohai; show more...; Zhang, Haibo; Zhou, Yingtang; Wågberg, Thomas, ...; Hu, Guangzhi; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Chemical Enginee ...; and Other Chemical E ...

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