Hemoglobin-derived Fe-Nx-S species supported by bamboo-shaped carbon nanotubes as efficient electrocatalysts for the oxygen evolution reaction

Chen, Weiming; Luo, Xuanli; Ling, Sanliang; Zhou, Yongfang; Shen, Bihan; Slater, Thomas J.A.; Alves Fernandes, Jesum; Lin, Tingting; Wang, Jianshe; Shen, Yi

Abstract

Herein, we report a facile route to synthesize isolated single iron atoms on nitrogen-sulfur-codoped carbon matrix via a direct pyrolysis process in which hemoglobin, a by-product of the meat industry, was utilized as a precursor for iron, nitrogen and sulfur while bamboo-shaped carbon nanotubes served as a support owing to their excellent conductivity and numerous defects. The resulting metal-nitrogen complexed carbon showed outstanding catalytic performance for the oxygen evolution reaction (OER) in alkaline solutions. At an overpotential of 380?mV, the optimal sample yielded a current density of 83.6?mA?cm?2, which is 2.5 times that of benchmark IrO2 (32.8?mA?cm?2), rendering it as one of the best OER catalysts reported so far. It also showed negligible activity decay in alkaline solutions during long-term durability tests. Control experiments and X-ray absorption fine structure analyses revealed that Fe-Nx species in the samples are the active sites for OER. Further density functional theory calculations indicated that the presence of sulfur in the carbon matrix modified the electronic structures of active species, thereby leading to the superior activity of the sample.

Citation

Chen, W., Luo, X., Ling, S., Zhou, Y., Shen, B., Slater, T. J., …Shen, Y. (2020). Hemoglobin-derived Fe-Nx-S species supported by bamboo-shaped carbon nanotubes as efficient electrocatalysts for the oxygen evolution reaction. Carbon, 168, 588-596. https://doi.org/10.1016/j.carbon.2020.06.064

• Journal Article Type: Article
• Acceptance Date: Jun 21, 2020
• Online Publication Date: Jun 24, 2020
• Publication Date: Oct 30, 2020
• Deposit Date: Jul 31, 2020
• Publicly Available Date: Jun 25, 2021
• Journal: Carbon
• Print ISSN: 0008-6223
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 168
• Pages: 588-596
• DOI: https://doi.org/10.1016/j.carbon.2020.06.064
• Keywords: General Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/4738304
• Publisher URL: https://www.sciencedirect.com/science/article/abs/pii/S0008622320306333