Nanosized Zirconium Porphyrinic Metal–Organic Frameworks that Catalyze the Oxygen Reduction Reaction in Acid,Small Methods

当前位置： X-MOL 学术 › Small Methods › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Nanosized Zirconium Porphyrinic Metal–Organic Frameworks that Catalyze the Oxygen Reduction Reaction in Acid
Small Methods ( IF 10.7 ) Pub Date : 2020-08-09 , DOI: 10.1002/smtd.202000085
Gan Chen ₁ , Michaela Burke Stevens _{2,

3} , Yunzhi Liu ₁ , Laurie A. King ₄ , Jihye Park ₅ , Taeho Roy Kim ₆ , Robert Sinclair ₁ , Thomas F. Jaramillo _{2,

3} , Zhenan Bao _{2,

3}

Affiliation

Porphyrinic metal–organic frameworks (PMOFs) are very appealing electrocatalytic materials, in part, due to their highly porous backbone, well‐defined and dispersed metal active sites, and their long‐range order. Herein a series of (Co)PCN222 (PCN: porous coordination network) (nano)particles with different sizes are successfully prepared by coordination modulation synthesis. These particles exhibit stability in 0.1 m HClO₄ electrolyte with no obvious particle size or compositional changes observed after being soaked for 3 days in the electrolyte or during electrocatalysis. This long‐term stability enables the in‐depth investigation into the electrocatalytic oxygen reduction, and it is further demonstrated that the (Co)PCN222 particle size correlates with its catalytic activity. Of the three particle sizes evaluated (characteristic length scales of 200, 500, and 1000 nm), the smallest size demonstrates the highest mass activity while the largest size has the highest surface area normalized activity. Together these results highlight the importance of determining the structural stability of framework catalysts and provide insights into the important roles of particle size, opening new avenues to investigate and improve the electrocatalytic performance of this class of framework material.

中文翻译：

纳米锆卟啉金属-有机骨架，催化酸中的氧还原反应

卟啉金属-有机骨架（PMOF）是非常吸引人的电催化材料，部分原因是它们具有高度多孔的骨架，定义明确且分散的金属活性位点以及长期的有序性。本文通过配位调制合成成功制备了一系列不同尺寸的（Co）PCN222（PCN：多孔配位网络）（纳米）粒子。这些颗粒在0.1 m HClO _4中表现出稳定性在电解液中浸泡3天或在电催化过程中未观察到明显的粒径或组成变化的电解液。这种长期的稳定性使我们能够深入研究电催化氧的还原反应，并进一步证明了（Co）PCN222的粒径与其催化活性有关。在评估的三个粒径（特征长度标度分别为200、500和1000 nm）中，最小的粒径表现出最高的质量活度，而最大的粒径表现出最高的表面积归一化活性。这些结果共同突出了确定骨架催化剂结构稳定性的重要性，并提供了有关粒径重要作用的见解，

更新日期：2020-10-07

点击分享查看原文

点击收藏

阅读更多本刊最新论文