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Article

Effect of Pyrolysis Conditions on the Performance of Co–Doped MOF–Derived Carbon Catalysts for Oxygen Reduction Reaction

1
Innovation Institute for Sustainable Maritime Architecture Research and Technology, Qingdao University of Technology, Qingdao 266520, China
2
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
*
Author to whom correspondence should be addressed.
Academic Editors: Francesca Raganati and Alessandra Procentese
Received: 27 August 2021 / Revised: 25 September 2021 / Accepted: 25 September 2021 / Published: 27 September 2021
(This article belongs to the Topic Bioreactors: Control, Optimization and Applications)
MOF–derived porous carbon is a type of promising catalyst to replace expensive Pt–based catalysts for oxygen reduction reaction (ORR). The catalytic activity for ORR depends closely on pyrolysis conditions. In this work, a Co–doped ZIF–8 material was chosen as a research object. The effect of pyrolysis conditions (temperature, heating rate, two–step heating) on the ORR performance of ZIF–derived carbon catalysts was systematically studied. The Co–ZIF–8 catalyst carbonized at 900 °C exhibits better ORR catalytic activity than that carbonized at 800 °C and 1000 °C. Moreover, a low heating rate can enhance catalytic activity. Two–step pyrolysis is proven to be an effective way to improve the performance of catalysts. Reducing the heating rate in the low–temperature stage is more beneficial to the ORR performance, compared to the heating rate in the high–temperature stage. The results show that the Co–ZIF–8 catalyst exhibits the best performance when the precursor was heated to 350 °C at 2 °C/min, and then heated to 900 °C at 5 °C/min. The optimum Co–ZIF–8 catalyst shows a half–wave potential of 0.82 V and a current density of 5.2 mA·cm−2 in 0.1 M KOH solution. It also exhibits high content of defects and good graphitization. TEM mapping shows that Co and N atoms are highly dispersed in the polyhedral carbon skeleton. However, two–step pyrolysis has no significant effect on the stability of the catalyst. View Full-Text
Keywords: metal–organic framework; oxygen reduction reaction; pyrolysis; catalyst metal–organic framework; oxygen reduction reaction; pyrolysis; catalyst
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MDPI and ACS Style

Cui, N.; Bi, K.; Sun, W.; Wu, Q.; Li, Y.; Xu, T.; Lv, B.; Zhang, S. Effect of Pyrolysis Conditions on the Performance of Co–Doped MOF–Derived Carbon Catalysts for Oxygen Reduction Reaction. Catalysts 2021, 11, 1163. https://0-doi-org.brum.beds.ac.uk/10.3390/catal11101163

AMA Style

Cui N, Bi K, Sun W, Wu Q, Li Y, Xu T, Lv B, Zhang S. Effect of Pyrolysis Conditions on the Performance of Co–Doped MOF–Derived Carbon Catalysts for Oxygen Reduction Reaction. Catalysts. 2021; 11(10):1163. https://0-doi-org.brum.beds.ac.uk/10.3390/catal11101163

Chicago/Turabian Style

Cui, Ning, Kexiao Bi, Wei Sun, Qianqian Wu, Yinan Li, Tiewei Xu, Binjiang Lv, and Shuling Zhang. 2021. "Effect of Pyrolysis Conditions on the Performance of Co–Doped MOF–Derived Carbon Catalysts for Oxygen Reduction Reaction" Catalysts 11, no. 10: 1163. https://0-doi-org.brum.beds.ac.uk/10.3390/catal11101163

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