Engineering multi-hollow PtCo nanoparticles for oxygen reduction reaction via a NaCl-sealed annealing strategy
Engineering multi-hollow PtCo nanoparticles for oxygen reduction reaction via a NaCl-sealed annealing strategy
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通过 NaCl 密封退火策略设计用于氧还原反应的多空心 PtCo 纳米颗粒
DOI：
10.1016/j.jallcom.2021.161063
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发表时间：
2021-12
影响因子：
6.2
通讯作者：
Zidong Wei
中科院分区：
文献类型：
--
作者：
Yao Nie;Jianghai Deng;Wenting Jin;Wenlong Guo;Guangping Wu;Min Deng;Jiajun Zhou;Ruolan Yang;Shuo Zhang;Zidong Wei
Pt基纳米颗粒（NPs）的中空结构是降低Pt利用率同时保持良好氧还原反应（ORR）性能的最有效策略之一。这项工作提出了一种nacl密封退火策略，直接将固体Pt np转化为具有富Pt表面的多空心PtCo合金。通过nacl密封Pt/C@polydopamine-Co2+体系的退火，可以很容易地获得形成空心Pt合金的必要条件，并且Pt和Co原子之间的热活化纳米级Kirkendall缓蚀可以使内部固体Pt实现合金化和空心结构。由于外层刚性NaCl的保护，可以有效地避免NPs在热退火过程中严重的烧结。整个合成过程无模板，最终催化剂只需水洗即可从NaCl中轻松释放，是一种简便、绿色、通用的合成方法。最终获得的具有氮掺杂碳涂层的多空心PtCo NPs比基准商业Pt/C具有更高的ORR活性和稳定性。
Hollow-structuring of Pt-based nanoparticles (NPs) is among the most effective strategies for reducing Pt utilization whilst maintaining good performance for oxygen reduction reaction (ORR). This work presents a NaCl-sealed annealing strategy to directly convert solid Pt NPs into multi-hollow PtCo alloys with a Pt-rich surface. By annealing a NaCl-sealed Pt/C@polydopamine-Co2+system, the essential conditions for forming hollow Pt alloys can be easily equipped and a thermal activated nanoscale Kirkendall mitigation between Pt and Co atoms can consequently let inner solid Pt accomplish alloying and hollow-structuring. Serious sintering of NPs during thermal annealing can be efficiently avoided owing to the protection of outer rigid NaCl. The whole procedures is template-free and the final catalysts can be easily released from NaCl by just water washing, making the present synthesis a facile, green and versatile method. The final obtained multi-hollow PtCo NPs featured with a nitrogen-doped carbon coating afford much enhanced ORR activity and stability than benchmark commercial Pt/C.
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