Immobilization of Fe3N nanoparticles within N-doped carbon nanosheet frameworks as a high-efficiency electrocatalyst for oxygen reduction reaction in Zn-air batteries
Li, TF (Li, Tongfei)[ 1,2 ] ; Li, M (Li, Meng)[ 1 ] ; Zhang, MR (Zhang, Mengru)[ 1 ] ; Li, X (Li, Xin)[ 1 ] ; Liu, KH (Liu, Kunhao)[ 1 ] ; Zhang, MY (Zhang, Mingyi)[ 3 ] ; Liu, X (Liu, Xien)[ 4 ] ; Sun, DM (Sun, Dongmei)[ 1 ] ; Xu, L (Xu, Lin)[ 1 ]*（徐林） ; Zhang, YW (Zhang, Yiwei)[ 2 ]*; Tang, YW (Tang, Yawen)[ 1 ]

[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Jiangsu, Peoples R China
[ 2 ] Southeast Univ, Jiangsu Optoelect Funct Mat & Engn Lab, Sch Chem & Chem Engn, Nanjing 211189, Jiangsu, Peoples R China
[ 3 ] Harbin Normal Univ, Sch Phys & Elect Engn, Minist Educ, Key Lab Photon & Elect Bandgap Mat, Harbin 150025, Heilongjiang, Peoples R China
[ 4 ] Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266042, Shandong, Peoples R China

CARBON，201911,153,364-371

Rational design and feasible synthesis of economical, efficient and durable electrocatalysts as alternatives to precious metal-based catalysts toward the oxygen reduction reaction (ORR) is extremely desirable for the advancement of future sustainable energy devices. Herein, we demonstrate a feasible hydrogel bridged nitridation method to construct a 3D hierarchical carbon nanohybrid consisting of uniform Fe3N nanoparticles immobilized by N-doped carbon nanosheet frameworks (abbreviated as Fe3N@N-C). Lyophilization and subsequent nitridation treatment of the hydrogel formed by chitosan and K-3[Fe(CN)(6)] result in the formation of Fe3N@N-C catalyst. The firm coupling of well-dispersed Fe3N nanoparticles with the carbon nanosheet frameworks confers the synthesized Fe3N@N-C catalyst with abundant Fe-N -C active sites, robust mechanical strength and improved reaction kinetics. Consequently, the Fe3N@N-C catalyst shows excellent ORR activity, superb stability and remarkable tolerance to methanol in alkaline condition, as compared with commercial Pt/C catalyst. Remarkably, when applied as an air cathode catalyst in a primary Zn-air battery, the Fe3N@N-C catalyst displays comparable performance to the commercial Pt/C catalyst with high power density and specific capacity. The proposed strategy in this work is anticipated to inspire the future design of cost-effective yet high-performance electrocatalysts for advanced electrochemical applications.

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https://www.sciencedirect.com/science/article/pii/S0008622319307316?via%3Dihub

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