Volume 46, Issue 4 pp. 4142-4155
RESEARCH ARTICLE

High temperature-induced myoglobin-mimic catalytic structure having high axial ligand content for one-compartment hydrogen peroxide fuel cells

Sieun Jeon

Sieun Jeon

Department of Chemical and Biological Engineering, Korea National University of Transportation, Chungju, Republic of Korea

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Heeyeon An

Heeyeon An

Department of IT·Energy Convergence (BK21 FOUR), Korea National University of Transportation, Chungju, Republic of Korea

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Jungyeon Ji

Jungyeon Ji

Graduate school of Energy and Environment, Seoul National University of Science and Technology, Seoul, Republic of Korea

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Yongchai Kwon

Corresponding Author

Yongchai Kwon

Graduate school of Energy and Environment, Seoul National University of Science and Technology, Seoul, Republic of Korea

Department of Chemical and Biomolecular Engineering, Seoul National University of Science and Technology, Seoul, Republic of Korea

Correspondence

Yongchai Kwon, Graduate school of Energy and Environment, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea.

Email: [email protected]

Yongjin Chung, Department of Chemical and Biological Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju, Chungbuk 27469, Republic of Korea.

Email: [email protected]

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Yongjin Chung

Corresponding Author

Yongjin Chung

Department of Chemical and Biological Engineering, Korea National University of Transportation, Chungju, Republic of Korea

Department of IT·Energy Convergence (BK21 FOUR), Korea National University of Transportation, Chungju, Republic of Korea

Correspondence

Yongchai Kwon, Graduate school of Energy and Environment, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea.

Email: [email protected]

Yongjin Chung, Department of Chemical and Biological Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju, Chungbuk 27469, Republic of Korea.

Email: [email protected]

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First published: 28 October 2021
Citations: 10

Sieun Jeon, Heeyeon An, and Jungyeon Ji contributed equally to this work.

Funding information: National Research Foundation of Korea, Grant/Award Number: 2020R1C1C1010386

Summary

A facile and inexpensive method of fabricating a myoglobin-mimic nanostructure is introduced by evaluating the influence of temperature conditions on the axial coordination between the Fe core of hemin and amine of polyethyleneimine (PEI). Through the high-temperature (100°C) synthesis condition, more hemin molecules are strongly attached to the carbon nanotube and PEI composite owing to the amide bond formation, whereas the energy distribution of hemin is deformed, and the electrical connection is improved by the coordination of axial ligands when the catalyst is synthesized on a lower temperature (25°C). Benefiting from the high concentration of axial ligands, the onset potential is positively shifted by 0.258 V, and the highest current density (155.43 μA cm−2) is observed with 10 mM H2O2 under physiological conditions. These phenomena occur because of the different hydrogen peroxide reduction reaction (HPRR) mechanisms and the overpotential stemming from the effect of the axial ligand, which induces the lowest catalytic and charge transfer resistance for HPRR at 51 and 820 Ω cm−2, respectively. In the polarization curves measured using a 3D printed membraneless flow-type fuel cell, the maximum power density reaches 129.0 μW cm−2 with 0.340 V of open-circuit voltage, respectively, which offers the best performance among the reported studies for the membraneless hydrogen peroxide fuel cells driving under physiological conditions so far.

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