Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 5, Issue 1, Pages 5281-5286Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ee02243a
Keywords
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Funding
- 973 Program Project of China [2012CB932801]
- National Science Foundation of China [90923011, 51001053, 51171092]
- Independent Innovation Foundation of Shandong University (IIFSDU)
- Doctoral Program of Higher Education of China [20090131110019]
- Shandong Natural Science Fund for Distinguished Young Scholars [JQ200815]
- Ministry of Education
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It is of critical importance to design and fabricate highly active and durable oxygen reduction reaction (ORR) catalysts for the application of proton exchange membrane fuel cells (PEMFCs). By a simple two-step dealloying process, the active components in a Pt/Ni/Al ternary alloy were sequentially leached out in a highly controllable manner, generating a novel nanoporous surface alloy structure. Characterized by an open bicontinuous spongy morphology, the resulting nanostructure is interconnected by similar to 3 nm diameter ligaments which are comprised of a Pt/Ni alloy core and a nearly pure Pt surface. In the absence of any catalyst support, these nanoporous surface alloys show much enhanced durability and electrocatalytic activity for ORR as compared to the commercial Pt/C catalyst. At a high potential, such as 0.9 V versus RHE, nanoporous Pt/Ni surface alloys show a remarkable specific activity of 1.23 mA cm(-2). These nanomaterials thus hold great potential as cathode catalysts in PEMFCs in terms of facile preparation, clean catalyst surface, and enhanced ORR activity and durability.
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