| 查看: 1252 | 回复: 4 | |||
junkpengli铜虫 (小有名气)
|
[交流]
Nature Materials和Nano Lett最新关于PEM fuel cell ORR的intermetallic催化剂的文章
|
|
Structurally ordered intermetallic platinum–cobalt core–shell nanoparticles with enhanced activity and stability as oxygen reduction electrocatalysts Deli Wang*, Huolin L. Xin*, Robert Hovden, Hongsen Wang, Yingchao Yu, David A. Muller, Francis J. DiSalvo & Héctor D. Abruña Published online: 28 October 2012 | doi:10.1038/nmat3458 Enhancing and optimizing the performance and durability of nanocatalysts for the oxygen reduction reaction is crucial for fuel-cell applications. A class of Pt–Co nanocatalysts consisting of ordered Pt3Co intermetallic cores with a 2–3 atomic-layer-thick platinum shell now exhibit a large increase in mass activity and specific activity when compared with disordered alloy nanoparticles. Tuning Oxygen Reduction Reaction Activity via Controllable Dealloying: A Model Study of Ordered Cu3Pt/C Intermetallic Nanocatalysts http://pubs.acs.org/doi/abs/10.1021/nl302404g A promising electrocatalyst prototype of low Pt mole fraction, intermetallic nanoparticles of Cu3Pt, has been prepared using a simple impregnation-reduction method, followed by a post heat-treatment. Two dealloying methods (electrochemical and chemical) were implemented to control the atomic-level morphology and improve performance for the oxygen reduction reaction (ORR). The morphology and elemental composition of the dealloyed nanoparticles were characterized at angstrom resolution using an aberration-corrected scanning transmission electron microscope equipped with an electron energy loss spectrometer. We found that the electrochemical dealloying method led to the formation of a thin Pt skin of ca. 1 nm in thickness with an ordered Cu3Pt core structure, while chemical leaching gave rise to a “spongy” structure with no ordered structure being preserved. A three-dimensional tomographic reconstruction indicated that numerous voids were formed in the chemically dealloyed nanoparticles. Both dealloying methods yielded enhanced specific and mass activities toward the ORR and higher stability relative to Pt/C. The spongy nanoparticles exhibited better mass activity with a slightly lower specific activity than the electrochemically dealloyed nanoparticles after 50 potential cycles. In both cases, the mass activity was still enhanced after 5000 potential cycles. 另附几篇重要的JACS, Nano Letters相关的文章 |
回复此楼» 本帖附件资源列表
-
欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：xiaomuchong@tal.com - 附件 1 : FuelcellORRbimetallicnanocatalysts.zip
2012-10-29 14:51:22, 5.35 M
» 猜你喜欢
北京航空航天大学26级博士招生-生物医学工程-合成生物学
已经有20人回复
-
温州大学王娟课题组2026年招生
已经有10人回复
-
无机化学论文润色/翻译怎么收费?
已经有273人回复
-
温州大学2026年招生（化学、材料）
已经有10人回复
-
招生负责_院士团队_学生高自由度成长_擅长学生培养
已经有5人回复
-
温州大学招收2026年入学博士研究生（化学、材料、环境）
已经有10人回复
-
非晶合金
已经有2人回复
-
院士团队-每届学生都优秀-高自由度-团队氛围好
已经有0人回复
-
求调剂
已经有1人回复
» 本主题相关价值贴推荐，对您同样有帮助:
- nature Asia Mat 最近评论: 金属玻璃
已经有63人回复
- nature Asia Mat 评论: 铁电材料
已经有210人回复
- nature Asia Mat 最新评论:氧化物生物传感器
已经有40人回复
- nature Asia Mat 最新评论：液晶显示器
已经有50人回复
- 帮别人再求一篇Nature Mat 文章
已经有1人回复
0.8
| 顶一下，感谢分享！ |
2楼2012-10-29 18:49:02
0.8
| 顶一下，感谢分享！ |
3楼2012-10-29 18:58:46
junkpengli
铜虫 (小有名气)
| 顶一下 |
4楼2012-12-19 18:44:06
junkpengli
铜虫 (小有名气)
| 顶一下 |
5楼2013-01-10 02:18:28
