Washington Univ., St. Louis, MO (United States). Center for Solar Energy and Energy Storage; Washington University in St. Louis
Washington Univ., St. Louis, MO (United States). Center for Solar Energy and Energy Storage
Nissan Technical Center North America, Farmington Hills, MI (United States)
Univ. of California, Irvine, CA (United States). National Fuel Cell Research Center
Univ. of New Mexico, Albuquerque, NM (United States). Center for Micro-Engineered Materials; Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Bhabha Atomic Research Centre (BARC), Mumbai (India)
The lifetime of commercial Proton Exchange Membrane Fuel Cells (PEMFCs) is circumscribed by the insufficient durability of commercial catalysts. The use of metal oxide supports in place of carbon significantly increases electrocatalyst durability. Herein, following density functional theory (DFT) predictions of improved Platinum (Pt) stability on antimony doped tin oxide (ATO) supports, we synthesized ATO whose morphology and crystal structure was engineered using a Pt anchoring technique. X-ray photoelectron spectroscopy (XPS) indicated that the Pt anchor sites aided in the reduction of Pt precursors to Pt on the ATO surface. X-ray absorption near-edge spectroscopy (XANES) revealed the existence of strong-metal-support interactions (SMSI) between Pt and ATO. The combination of SMSI and high control over Pt dispersion enabled the Pt/Pt-aerogel-ATO (Pt supported on aerogel ATO with Pt anchor sites) electrocatalyst to achieve 2x the area specific activity of Pt/C in ex-situ testing. In a H2/air PEMFC Pt/Pt-aerogel-ATO cathodes enabled 20% higher peak power density and <1/6 the loss of active surface area as compared to Pt/C. Notably, in a PEMFC under rigorous potential cycling, the Pt/Pt-aerogel-ATO retained its initial peak power density as opposed to a 58% loss for Pt/C. Further, cost models indicate that Pt/Pt-aerogel-ATO is 26% less expensive than Pt/C over its useful lifetime.
@article{osti_2346218,
author = {He, Cheng and Sankarasubramanian, Shrihari and Ells, Andrew and Parrondo, Javier and Gumeci, Cenk and Kodali, Mounika and Matanovic, Ivana and Yadav, Ashok Kumar and Bhattacharyya, Kaustava and Dale, Nilesh and others},
title = {Self-Anchored Platinum-Decorated Antimony-Doped-Tin Oxide as a Durable Oxygen Reduction Electrocatalyst},
annote = {The lifetime of commercial Proton Exchange Membrane Fuel Cells (PEMFCs) is circumscribed by the insufficient durability of commercial catalysts. The use of metal oxide supports in place of carbon significantly increases electrocatalyst durability. Herein, following density functional theory (DFT) predictions of improved Platinum (Pt) stability on antimony doped tin oxide (ATO) supports, we synthesized ATO whose morphology and crystal structure was engineered using a Pt anchoring technique. X-ray photoelectron spectroscopy (XPS) indicated that the Pt anchor sites aided in the reduction of Pt precursors to Pt on the ATO surface. X-ray absorption near-edge spectroscopy (XANES) revealed the existence of strong-metal-support interactions (SMSI) between Pt and ATO. The combination of SMSI and high control over Pt dispersion enabled the Pt/Pt-aerogel-ATO (Pt supported on aerogel ATO with Pt anchor sites) electrocatalyst to achieve 2x the area specific activity of Pt/C in ex-situ testing. In a H2/air PEMFC Pt/Pt-aerogel-ATO cathodes enabled 20% higher peak power density and <1/6 the loss of active surface area as compared to Pt/C. Notably, in a PEMFC under rigorous potential cycling, the Pt/Pt-aerogel-ATO retained its initial peak power density as opposed to a 58% loss for Pt/C. Further, cost models indicate that Pt/Pt-aerogel-ATO is 26% less expensive than Pt/C over its useful lifetime.},
doi = {10.1021/acscatal.1c00963},
url = {https://www.osti.gov/biblio/2346218},
journal = {ACS Catalysis},
issn = {ISSN 2155-5435},
number = {12},
volume = {11},
place = {United States},
publisher = {American Chemical Society (ACS)},
year = {2021},
month = {06}}