Effect of Support on Oxygen Reduction Reaction Activity of Supported Iron Porphyrins

Qi Hua; Kenneth E. Madsen; Anne Marie Esposito; Xinyi Chen; Toby J. Woods; Richard T. Haasch; Shuting Xiang; Anatoly I. Frenkel; Timothy T. Fister; Andrew A. Gewirth

doi:10.1021/acscatal.1c04871

Effect of Support on Oxygen Reduction Reaction Activity of Supported Iron Porphyrins

Qi Hua, Kenneth E. Madsen, Anne Marie Esposito, Xinyi Chen, Toby J. Woods, Richard T. Haasch, Shuting Xiang, Anatoly I. Frenkel, Timothy T. Fister, Andrew A. Gewirth

Research output: Contribution to journal › Article › peer-review

Abstract

We report the oxygen reduction reaction (ORR) activity in acid of an Fe porphyrin on different supports. While the activity is high (E_1/2 = 0.34 V vs RHE with n = 3.8) when the Fe porphyrin is adsorbed on XC72 (a graphitic carbon), this activity is much lower when the porphyrin is adsorbed on either MoS₂ (E_1/2 = −0.15 V vs RHE with n = 2.2) or g-C₃N₄ (E_1/2 = −0.24 V vs RHE with n = 3.1). Electron paramagnetic resonance (EPR), X-ray absorption fine structure (XAFS), and magnetometry measurements show the electronic structure around the Fe center is the same for all three supports. Only the Fe porphyrin supported on XC72 exhibits a pH dependence in its ORR activity. This observation, coupled with the increased hydrophilicity of XC72 relative to the other supports, suggests that the support-electrolyte interaction controls the ORR activity. Modification of MoS₂ to increase its hydrophilicity results in a more active ORR catalyst.

Original language	English (US)
Pages (from-to)	1139-1149
Number of pages	11
Journal	ACS Catalysis
Volume	12
Issue number	2
DOIs	https://doi.org/10.1021/acscatal.1c04871
State	Published - Jan 21 2022

Keywords

MoS
carbon
carbon nitride
hydrophilicity
iron porphyrin
oxygen reduction reaction

ASJC Scopus subject areas

Catalysis
General Chemistry

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10.1021/acscatal.1c04871

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title = "Effect of Support on Oxygen Reduction Reaction Activity of Supported Iron Porphyrins",

abstract = "We report the oxygen reduction reaction (ORR) activity in acid of an Fe porphyrin on different supports. While the activity is high (E1/2 = 0.34 V vs RHE with n = 3.8) when the Fe porphyrin is adsorbed on XC72 (a graphitic carbon), this activity is much lower when the porphyrin is adsorbed on either MoS2 (E1/2 = −0.15 V vs RHE with n = 2.2) or g-C3N4 (E1/2 = −0.24 V vs RHE with n = 3.1). Electron paramagnetic resonance (EPR), X-ray absorption fine structure (XAFS), and magnetometry measurements show the electronic structure around the Fe center is the same for all three supports. Only the Fe porphyrin supported on XC72 exhibits a pH dependence in its ORR activity. This observation, coupled with the increased hydrophilicity of XC72 relative to the other supports, suggests that the support-electrolyte interaction controls the ORR activity. Modification of MoS2 to increase its hydrophilicity results in a more active ORR catalyst.",

keywords = "MoS, carbon, carbon nitride, hydrophilicity, iron porphyrin, oxygen reduction reaction",

author = "Qi Hua and Madsen, {Kenneth E.} and Esposito, {Anne Marie} and Xinyi Chen and Woods, {Toby J.} and Haasch, {Richard T.} and Shuting Xiang and Frenkel, {Anatoly I.} and Fister, {Timothy T.} and Gewirth, {Andrew A.}",

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T1 - Effect of Support on Oxygen Reduction Reaction Activity of Supported Iron Porphyrins

AU - Hua, Qi

AU - Madsen, Kenneth E.

AU - Esposito, Anne Marie

AU - Chen, Xinyi

AU - Woods, Toby J.

AU - Haasch, Richard T.

AU - Xiang, Shuting

AU - Frenkel, Anatoly I.

AU - Fister, Timothy T.

AU - Gewirth, Andrew A.

PY - 2022/1/21

Y1 - 2022/1/21

N2 - We report the oxygen reduction reaction (ORR) activity in acid of an Fe porphyrin on different supports. While the activity is high (E1/2 = 0.34 V vs RHE with n = 3.8) when the Fe porphyrin is adsorbed on XC72 (a graphitic carbon), this activity is much lower when the porphyrin is adsorbed on either MoS2 (E1/2 = −0.15 V vs RHE with n = 2.2) or g-C3N4 (E1/2 = −0.24 V vs RHE with n = 3.1). Electron paramagnetic resonance (EPR), X-ray absorption fine structure (XAFS), and magnetometry measurements show the electronic structure around the Fe center is the same for all three supports. Only the Fe porphyrin supported on XC72 exhibits a pH dependence in its ORR activity. This observation, coupled with the increased hydrophilicity of XC72 relative to the other supports, suggests that the support-electrolyte interaction controls the ORR activity. Modification of MoS2 to increase its hydrophilicity results in a more active ORR catalyst.

AB - We report the oxygen reduction reaction (ORR) activity in acid of an Fe porphyrin on different supports. While the activity is high (E1/2 = 0.34 V vs RHE with n = 3.8) when the Fe porphyrin is adsorbed on XC72 (a graphitic carbon), this activity is much lower when the porphyrin is adsorbed on either MoS2 (E1/2 = −0.15 V vs RHE with n = 2.2) or g-C3N4 (E1/2 = −0.24 V vs RHE with n = 3.1). Electron paramagnetic resonance (EPR), X-ray absorption fine structure (XAFS), and magnetometry measurements show the electronic structure around the Fe center is the same for all three supports. Only the Fe porphyrin supported on XC72 exhibits a pH dependence in its ORR activity. This observation, coupled with the increased hydrophilicity of XC72 relative to the other supports, suggests that the support-electrolyte interaction controls the ORR activity. Modification of MoS2 to increase its hydrophilicity results in a more active ORR catalyst.

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KW - carbon nitride

KW - hydrophilicity

KW - iron porphyrin

KW - oxygen reduction reaction

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Effect of Support on Oxygen Reduction Reaction Activity of Supported Iron Porphyrins

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