TY - JOUR
T1 - Nonprecious Bimetallic Sites Coordinated on N-Doped Carbons with Efficient and Durable Catalytic Activity for Oxygen Reduction
AU - Yuan, Shan
AU - Cui, Li Li
AU - Dou, Zhiyu
AU - Ge, Xin
AU - He, Xingquan
AU - Zhang, Wei
AU - Asefa, Tewodros
N1 - Funding Information:
This work was supported by International Cooperation Project of Jilin Province (20190701022GH) and National Natural Science Foundation of China (51872115).
PY - 2020/10/1
Y1 - 2020/10/1
N2 - Developing efficient, inexpensive, and durable electrocatalysts for the oxygen reduction reaction (ORR) is important for the large-scale commercialization of fuel cells and metal–air batteries. Herein, a hierarchically porous bimetallic Fe/Co single-atom-coordinated N-doped carbon (Fe/Co-Nx-C) electrocatalyst for ORR is synthesized from Fe/Co-coordinated polyporphyrin using silica template-assisted and silica-protection synthetic strategies. In the synthesis, first silica nanoparticles-embedded, silica-protected Fe/Co-polyporphyrin is prepared. It is then pyrolyzed and treated with acidic solution. The resulting Fe/Co-Nx-C material has a large specific surface area, large electrochemically active surface area, good conductivity, and catalytically active Fe/Co-Nx sites. The material exhibits a very good electrocatalytic activity for the ORR in alkaline media, with a half-wave potential of 0.86 V versus reversible hydrogen electrode, which is better than that of Pt/C (20 wt%). Furthermore, it shows an outstanding operational stability and durability during the reaction. A zinc–air battery (ZAB) assembled using Fe/Co-Nx-C as an air-cathode electrocatalyst gives a high peak power density (152.0 mW cm−2) and shows a good recovery property. Furthermore, the performance of the battery is better than a corresponding ZAB containing Pt/C as an electrocatalyst. The work also demonstrates a synthetic route to a highly active, stable, and scalable single-atom electrocatalyst for ORR in ZABs.
AB - Developing efficient, inexpensive, and durable electrocatalysts for the oxygen reduction reaction (ORR) is important for the large-scale commercialization of fuel cells and metal–air batteries. Herein, a hierarchically porous bimetallic Fe/Co single-atom-coordinated N-doped carbon (Fe/Co-Nx-C) electrocatalyst for ORR is synthesized from Fe/Co-coordinated polyporphyrin using silica template-assisted and silica-protection synthetic strategies. In the synthesis, first silica nanoparticles-embedded, silica-protected Fe/Co-polyporphyrin is prepared. It is then pyrolyzed and treated with acidic solution. The resulting Fe/Co-Nx-C material has a large specific surface area, large electrochemically active surface area, good conductivity, and catalytically active Fe/Co-Nx sites. The material exhibits a very good electrocatalytic activity for the ORR in alkaline media, with a half-wave potential of 0.86 V versus reversible hydrogen electrode, which is better than that of Pt/C (20 wt%). Furthermore, it shows an outstanding operational stability and durability during the reaction. A zinc–air battery (ZAB) assembled using Fe/Co-Nx-C as an air-cathode electrocatalyst gives a high peak power density (152.0 mW cm−2) and shows a good recovery property. Furthermore, the performance of the battery is better than a corresponding ZAB containing Pt/C as an electrocatalyst. The work also demonstrates a synthetic route to a highly active, stable, and scalable single-atom electrocatalyst for ORR in ZABs.
KW - Fe/Co-coordinated polyporphyrin
KW - oxygen reduction reaction
KW - silica templates
KW - single-atom catalysts
KW - zinc–air batteries
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U2 - 10.1002/smll.202000742
DO - 10.1002/smll.202000742
M3 - Article
C2 - 32893431
AN - SCOPUS:85090205819
VL - 16
JO - Small
JF - Small
SN - 1613-6810
IS - 40
M1 - 2000742
ER -