TY - JOUR
T1 - Restricted diffusion preparation of fully-exposed Fe single-atom catalyst on carbon nanospheres for efficient oxygen reduction reaction
AU - Deng, Libo
AU - Qiu, Lei
AU - Hu, Rong
AU - Yao, Lei
AU - Zheng, Zijian
AU - Ren, Xiangzhong
AU - Li, Yongliang
AU - He, Chuanxin
N1 - Funding Information:
This work was supported by the Shenzhen Government's Plan of Science and Technology ( JCYJ20190808121407676 and 20200813142301001 ), the Natural Science Foundation of Guangdong ( 2020A1515011127 and 2020A1414010087 ), and the National Natural Science Foundation of China ( 22178223 ).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/5/15
Y1 - 2022/5/15
N2 - Single-atom catalysts (SAC) stabilized by nitrogen in carbon support are promising candidates for oxygen reduction reaction (ORR). However, conventional preparation methods usually lead to encapsulation of metallic centers in matrix and thus the utilization efficiency (UE) is underexploited. Herein, we report a novel strategy to prepare an Fe-SAC with all Fe atoms anchored on the surface of carbon nanospheres, which exhibited an extraordinary UE of 80% for ORR. This efficiency was achieved by coating polydopamine spheres with silica, followed by the pyrolysis of their blend with FeCl3. During thermal treatment, Fe migrates across the silica shell by atomic exchange with silicon, which inhibits the aggregation of Fe and allows Fe atoms to anchor on the surface. As such, it showed excellent ORR activity at a low Fe content. Zn-air batteries assembled using this catalyst showed a peak power density of 113 mW cm−2 and specific capacity of 710 mAh gZn−1.
AB - Single-atom catalysts (SAC) stabilized by nitrogen in carbon support are promising candidates for oxygen reduction reaction (ORR). However, conventional preparation methods usually lead to encapsulation of metallic centers in matrix and thus the utilization efficiency (UE) is underexploited. Herein, we report a novel strategy to prepare an Fe-SAC with all Fe atoms anchored on the surface of carbon nanospheres, which exhibited an extraordinary UE of 80% for ORR. This efficiency was achieved by coating polydopamine spheres with silica, followed by the pyrolysis of their blend with FeCl3. During thermal treatment, Fe migrates across the silica shell by atomic exchange with silicon, which inhibits the aggregation of Fe and allows Fe atoms to anchor on the surface. As such, it showed excellent ORR activity at a low Fe content. Zn-air batteries assembled using this catalyst showed a peak power density of 113 mW cm−2 and specific capacity of 710 mAh gZn−1.
KW - Oxygen reduction reactions
KW - Single-atom catalysts
KW - Utilization efficiency
UR - http://www.scopus.com/inward/record.url?scp=85122160774&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2021.121058
DO - 10.1016/j.apcatb.2021.121058
M3 - Journal article
AN - SCOPUS:85122160774
SN - 0926-3373
VL - 305
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 121058
ER -