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Title: Single-Iron Site Catalysts with Self-Assembled Dual-size Architecture and Hierarchical Porosity for Proton-Exchange Membrane Fuel Cells

Abstract

Atomically dispersed and nitrogen coordinated single iron site (i.e., FeN4) catalysts (Fe-N-C) are the most promising platinum group metal (PGM)-free cathode for the oxygen reduction reaction (ORR) in proton-exchange membrane fuel cells (PEMFCs). However, current Fe-N-C catalysts are limited by the inferior exposure of active FeN4 sites due to the inevitable agglomeration of particles in cathodes. Herein, we report a self-assembled strategy to synthesize the atomically dispersed FeN4 site catalysts with a hierarchically porous matrix derived from dual-size Fe-doped ZIF-8 crystal precursors by using large particles to support small particles. The tailored structure is effective in mitigating the particle migration, agglomeration, and spatial overlap, thereby exposing increased accessible active sites and facilitating mass transport. The best performing catalyst composed of 100 nm “nucleated seed” assembled by 30 nm “satellite” demonstrates exceptional ORR activity in acidic electrolyte and membrane electrode assembly. This work provides new concepts for designing hierarchically porous catalysts with single metal atom dispersion via self-assembly of ZIF-8 crystal precursors with tunable particle sizes and nanostructures.

Authors:
 [1];  [2];  [3]; ORCiD logo [4];  [5];  [2];  [2];  [6];  [6];  [7];  [8];  [4];  [6];  [9];  [3];  [2]
  1. Shenzhen Univ. (China); Univ. at Buffalo, NY (United States); State Univ. of New York (SUNY), Buffalo, NY (United States)
  2. Univ. at Buffalo, NY (United States); State Univ. of New York (SUNY), Buffalo, NY (United States)
  3. Oregon State Univ., Corvallis, OR (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Univ. of South Carolina, Columbia, SC (United States)
  6. Shenzhen Univ. (China)
  7. Northwestern Univ., Evanston, IL (United States)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  9. Northeast Normal Univ., Changchun (China)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office; Univ. at Buffalo; State Univ. of New York (SUNY); National Science Foundation (NSF)
OSTI Identifier:
1649998
Alternate Identifier(s):
OSTI ID: 1720226; OSTI ID: 1778307
Report Number(s):
BNL-216285-2020-JAAM
Journal ID: ISSN 0926-3373
Grant/Contract Number:  
SC0012704; CBET-1604392; 1804326; EE0008076; AC02-06CH11357; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Applied Catalysis B: Environmental
Additional Journal Information:
Journal Volume: 279; Journal ID: ISSN 0926-3373
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; single metal sites; oxygen reduction; self-assembly architecture; electrocatalysis; fuel cells

Citation Formats

Zhao, Xiaolin, Yang, Xiaoxuan, Wang, Maoyu, Hwang, Sooyeon, Karakalos, Stavros, Chen, Mengjie, Qiao, Zhi, Wang, Lei, Liu, Bin, Ma, Qing, Cullen, David A., Su, Dong, Yang, Haipeng, Zang, Hong-Ying, Feng, Zhenxing, and Wu, Gang. Single-Iron Site Catalysts with Self-Assembled Dual-size Architecture and Hierarchical Porosity for Proton-Exchange Membrane Fuel Cells. United States: N. p., 2020. Web. doi:10.1016/j.apcatb.2020.119400.
Zhao, Xiaolin, Yang, Xiaoxuan, Wang, Maoyu, Hwang, Sooyeon, Karakalos, Stavros, Chen, Mengjie, Qiao, Zhi, Wang, Lei, Liu, Bin, Ma, Qing, Cullen, David A., Su, Dong, Yang, Haipeng, Zang, Hong-Ying, Feng, Zhenxing, & Wu, Gang. Single-Iron Site Catalysts with Self-Assembled Dual-size Architecture and Hierarchical Porosity for Proton-Exchange Membrane Fuel Cells. United States. https://doi.org/10.1016/j.apcatb.2020.119400
Zhao, Xiaolin, Yang, Xiaoxuan, Wang, Maoyu, Hwang, Sooyeon, Karakalos, Stavros, Chen, Mengjie, Qiao, Zhi, Wang, Lei, Liu, Bin, Ma, Qing, Cullen, David A., Su, Dong, Yang, Haipeng, Zang, Hong-Ying, Feng, Zhenxing, and Wu, Gang. Thu . "Single-Iron Site Catalysts with Self-Assembled Dual-size Architecture and Hierarchical Porosity for Proton-Exchange Membrane Fuel Cells". United States. https://doi.org/10.1016/j.apcatb.2020.119400. https://www.osti.gov/servlets/purl/1649998.
@article{osti_1649998,
title = {Single-Iron Site Catalysts with Self-Assembled Dual-size Architecture and Hierarchical Porosity for Proton-Exchange Membrane Fuel Cells},
author = {Zhao, Xiaolin and Yang, Xiaoxuan and Wang, Maoyu and Hwang, Sooyeon and Karakalos, Stavros and Chen, Mengjie and Qiao, Zhi and Wang, Lei and Liu, Bin and Ma, Qing and Cullen, David A. and Su, Dong and Yang, Haipeng and Zang, Hong-Ying and Feng, Zhenxing and Wu, Gang},
abstractNote = {Atomically dispersed and nitrogen coordinated single iron site (i.e., FeN4) catalysts (Fe-N-C) are the most promising platinum group metal (PGM)-free cathode for the oxygen reduction reaction (ORR) in proton-exchange membrane fuel cells (PEMFCs). However, current Fe-N-C catalysts are limited by the inferior exposure of active FeN4 sites due to the inevitable agglomeration of particles in cathodes. Herein, we report a self-assembled strategy to synthesize the atomically dispersed FeN4 site catalysts with a hierarchically porous matrix derived from dual-size Fe-doped ZIF-8 crystal precursors by using large particles to support small particles. The tailored structure is effective in mitigating the particle migration, agglomeration, and spatial overlap, thereby exposing increased accessible active sites and facilitating mass transport. The best performing catalyst composed of 100 nm “nucleated seed” assembled by 30 nm “satellite” demonstrates exceptional ORR activity in acidic electrolyte and membrane electrode assembly. This work provides new concepts for designing hierarchically porous catalysts with single metal atom dispersion via self-assembly of ZIF-8 crystal precursors with tunable particle sizes and nanostructures.},
doi = {10.1016/j.apcatb.2020.119400},
journal = {Applied Catalysis B: Environmental},
number = ,
volume = 279,
place = {United States},
year = {Thu Aug 06 00:00:00 EDT 2020},
month = {Thu Aug 06 00:00:00 EDT 2020}
}

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