Enhanced Catalytic Activities of NiPt Truncated Octahedral Nanoparticles toward Ethylene Glycol Oxidation and OxygenReduction in Alkaline Electrolyte
Enhanced Catalytic Activities of NiPt Truncated Octahedral Nanoparticles toward Ethylene Glycol Oxidation and OxygenReduction in Alkaline Electrolyte
复制标题
NiPt 截短八面体纳米粒子增强碱性电解质中乙二醇氧化和氧还原的催化活性
DOI：
10.1021/acsami.6b01115
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发表时间：
2016
影响因子：
9.5
通讯作者：
R. M. Wang
中科院分区：
文献类型：
--
作者：
T. Y. Xia;J. L. Liu;S. G. Wang;C. Wang;Y. Sun;L. Gu;R. M. Wang
铂纳米颗粒（NPs）的高成本和差耐久性是质子交换膜燃料电池（PEMFC）大规模商业应用的极大限制。Pt基纳米粒子的均匀分布可以有效地减少昂贵的Pt的使用，同时提高中间体的抗毒性。在这项工作中，使用简单的一锅法在二甲基甲酰胺（DMF）中成功合成了超细（约7.5 nm）均匀的NiPt截短八面体纳米颗粒（TONP），无需任何种子或模板。在碱性电解液中，与NiPtNP和商业Pt/C催化剂相比，富Pt表面的NiPtTONP对乙二醇氧化反应（EGOR）和氧还原反应（ORR）具有更好的耐受性和更好的稳定性。EGOR的质量和比活度分别是商品Pt/C的23.2倍和17.6倍。我们的研究结果表明，显着的增强主要归因于富铂表面，较大的比表面积，以及Ni和Pt原子之间的耦合。该方法为在不久的将来制备高效的质子交换膜燃料电池电催化剂提供了一条很有前途的途径。
The high cost and poor durability of Pt nanoparticles (NPs) are great limits for the proton exchange membrane fuel cells (PEMFCs) from being scaled-up for commercial applications. Pt-based bimetallic NPs together with a uniform distribution can effectively reduce the usage of expensive Pt while increasing poison resistance of intermediates. In this work, a simple one-pot method was used to successfully synthesize ultrafine (about 7.5 nm) uniform NiPt truncated octahedral nanoparticles (TONPs) in dimethylformamid (DMF) without any seeds or templates. The as-prepared NiPt TONPs with Pt-rich surfaces exhibit greatly improved catalytic activities together with good tolerance and better stability for ethylene glycol oxidation reaction (EGOR) and oxygen reduction reaction (ORR) in comparison with NiPt NPs and commercial Pt/C catalysts in alkaline electrolyte. For example, the value of mass and specific activities for EGOR are 23.2 and 17.6 times higher comparing with those of commercial Pt/C, respectively. Our results demonstrate that the dramatic enhancement is mainly attributed to Pt-rich surface, larger specific surface area, together with coupling between Ni and Pt atoms. This developed method provides a promising pathway for simple preparation of highly efficient electrocatalysts for PEMFCs in the near future.