Abstract
Metal-nitrogen-carbons (M-N-Cs) as a reliable substitution for platinum-group-metals (PGMs) for oxygen reduction reaction (ORR) are emerging candidates to rationalize the technology of fuel cells. The development of M-N-Cs can further be economized by consuming waste biomass as an inexpensive carbon source for the electrocatalyst support. Herein, we report the simple fabrication and in-depth characterization of electrocatalysts using lignin-derived activated char. The activated char (LAC) was functionalized with metal phthalocyanine (FePc and MnPc) via atmosphere-controlled pyrolysis to produce monometallic M-N-Cs (L_Mn and L_Fe) and bimetallic M1-M2-N-Cs (L_FeMn) electrocatalysts. Raman spectroscopy and transmission electron microscopy (TEM) revealed a defect-rich architecture. XPS confirmed the coexistence of various nitrogen-containing active moieties. L_Fe and L_FeMn demonstrated appreciable ORR in both acidic and alkaline conditions whereas L_FeMn helped in restricting the peroxide yield, particularly in alkaline media. L_Fe and L_FeMn demonstrated remarkable onset potential (Eonset) of ∼0.942 V (vs RHE) with an E1/2 of 0.874 V (vs RHE) in 0.1 M KOH. In acid, L_FeMn had an Eonset of 0.817 V (vs RHE) and an E1/2 of ∼0.76 V (vs RHE). Finally, the L_FeMn as a cathode electrocatalyst was integrated and tested in PEMFC and AEMFC. AEMFC demonstrated optimistic performance with a peak power density of 261 mW cm−2 at the current density of ∼577 mA cm−2.
Original language | English |
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Article number | 232416 |
Journal | Journal of Power Sources |
Volume | 556 |
DOIs | |
State | Published - 1 Feb 2023 |
Bibliographical note
Publisher Copyright:© 2022 Elsevier B.V.
Funding
C.S. would like to thank the support from the Italian Ministry of University and Research (Ministero dell'Università e della Ricerca – MUR) through the “Rita Levi Montalcini 2018” fellowship (Grant number PGR18MAZLI). The authors also thank the Italian ministry MIUR for funding through the FISR 2019 project AMPERE (FISR2019_01294). University of Bologna authors acknowledge MUR and UE support under the project “ECOSYSTEM FOR SUSTAINABLE TRANSITION IN EMILIA-ROMAGNA” of the National Recovery and Resilience Plan (NRRP-PNRR). C.S. would like to thank the support from the Italian Ministry of University and Research (Ministero dell’Università e della Ricerca – MUR) through the “Rita Levi Montalcini 2018” fellowship (Grant number PGR18MAZLI ). The authors also thank the Italian ministry MIUR for funding through the FISR 2019 project AMPERE ( FISR2019_01294 ). University of Bologna authors acknowledge MUR and UE support under the project “ECOSYSTEM FOR SUSTAINABLE TRANSITION IN EMILIA-ROMAGNA” of the National Recovery and Resilience Plan (NRRP-PNRR).
Funders | Funder number |
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Italian ministry MIUR | FISR2019_01294 |
NRRP-PNRR | |
National Recovery and Resilience Plan | |
Ministero dell’Istruzione, dell’Università e della Ricerca | PGR18MAZLI |
Università di Bologna |
Keywords
- Anion exchange membrane fuel cell
- Lignin-derived char
- Oxygen reduction reaction
- Platinum group metal-free
- Proton exchange membrane fuel cell