In:
Science, American Association for the Advancement of Science (AAAS), Vol. 348, No. 6240 ( 2015-06-12), p. 1230-1234
Abstract:
Bimetallic platinum-nickel (Pt-Ni) nanostructures represent an emerging class of electrocatalysts for oxygen reduction reaction (ORR) in fuel cells, but practical applications have been limited by catalytic activity and durability. We surface-doped Pt 3 Ni octahedra supported on carbon with transition metals, termed M ‐Pt 3 Ni/C, where M is vanadium, chromium, manganese, iron, cobalt, molybdenum (Mo), tungsten, or rhenium. The Mo‐Pt 3 Ni/C showed the best ORR performance, with a specific activity of 10.3 mA/cm 2 and mass activity of 6.98 A/mg Pt , which are 81- and 73‐fold enhancements compared with the commercial Pt/C catalyst (0.127 mA/cm 2 and 0.096 A/mg Pt ). Theoretical calculations suggest that Mo prefers subsurface positions near the particle edges in vacuum and surface vertex/edge sites in oxidizing conditions, where it enhances both the performance and the stability of the Pt 3 Ni catalyst.
Type of Medium:
Online Resource
ISSN:
0036-8075
,
1095-9203
DOI:
10.1126/science.aaa8765
Language:
English
Publisher:
American Association for the Advancement of Science (AAAS)
Publication Date:
2015
detail.hit.zdb_id:
128410-1
detail.hit.zdb_id:
2066996-3
detail.hit.zdb_id:
2060783-0
SSG:
11
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