期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 5, 期 1, 页码 5281-5286出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ee02243a
关键词
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资金
- 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
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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