PtCo-excavated rhombic dodecahedral nanocrystals for efficient electrocatalysis,Nanoscale Advances

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PtCo-excavated rhombic dodecahedral nanocrystals for efficient electrocatalysis
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-08-29 , DOI: 10.1039/d0na00717j
Cong Shen ₁ , Xuemin Li ₁ , Yajing Wei ₁ , Zhenming Cao ₁ , Huiqi Li ₁ , Yaqi Jiang ₁ , Zhaoxiong Xie ₁

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Platinum (Pt)-based catalysts have shown excellent catalytic performance in many fields, particularly for the oxygen reduction reaction (ORR) and direct oxidation of small fuel molecules. Further development of Pt-based electrocatalysts relies on the morphology design of Pt-based alloy nanocrystals (NCs) with highly accessible and active surface sites to optimize Pt atomic utilization. In this work, we reported PtCo-excavated rhombic dodecahedral (ERD) NCs consisting of the self-assembly of 24 ultrathin nanosheets synthesized by a simple wet chemical method. The morphology can be regulated from convex to excavated polyhedra by controlling the amount of formaldehyde and the molar ratio of the Co/Pt precursor. The as-prepared PtCo ERD NCs/C catalyst exhibits excellent ORR performance, which has about 12 times higher specific activity and 6 times higher mass activity than the commercial Pt/C catalyst. It also displays good electrocatalytic ability towards methanol oxidation, in which the specific activity and mass activity are about 6 times higher and 2 times higher than the commercial Pt/C, respectively. Their enhanced activity is attributed to the excavated structure and alloy feature.

中文翻译：

PtCo 挖掘的菱形十二面体纳米晶体用于高效电催化

铂 (Pt) 基催化剂在许多领域都表现出优异的催化性能，特别是对于小燃料分子的氧还原反应 (ORR) 和直接氧化。Pt 基电催化剂的进一步发展依赖于 Pt 基合金纳米晶体 (NCs) 的形态设计，该纳米晶体具有高度可及性和活性表面位点，以优化 Pt 原子利用率。在这项工作中，我们报道了由 PtCo 挖掘的菱形十二面体 (ERD) NCs，它由通过简单的湿化学方法合成的 24 个超薄纳米片的自组装组成。通过控制甲醛的量和Co/Pt前驱体的摩尔比，可以将形貌从凸多面体调节到挖掘多面体。所制备的 PtCo ERD NCs/C 催化剂表现出优异的 ORR 性能，其比活性比商业 Pt/C 催化剂高约 12 倍，质量活性高约 6 倍。它还表现出良好的甲醇氧化电催化能力，比活性和质量活性分别比商业 Pt/C 高约 6 倍和 2 倍。它们的增强活性归因于挖掘出的结构和合金特征。

更新日期：2020-10-13

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