Nanosized Zirconium Porphyrinic Metal–Organic Frameworks that Catalyze the Oxygen Reduction Reaction in Acid. Issue 10 (9th August 2020)

• Record Type: Journal Article
• Authors: Chen, Gan; Stevens, Michaela Burke; Liu, Yunzhi; King, Laurie A.; Park, Jihye; Kim, Taeho Roy; Sinclair, Robert; Jaramillo, Thomas F.; Bao, Zhenan
• Is Part Of: Small methods. Volume 4:Issue 10(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-09
• Subjects: coordination modulation -- electrocatalysis -- nanoparticle -- oxygen reduction reaction -- porphyrinic metal–organic framework; Nanotechnology -- Methodology -- Periodicals; Nanotechnology -- Periodicals; Periodicals; 620.5028
• DOI: 10.1002/smtd.202000085
• Languages: English
• ISSNs: 2366-9608

Abstract

Abstract: 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. Abstract : Zirconium porphyrinic metal–organic framework (Co)PCN222 (PCN: porous coordination network) (nano)particles show good stability and activity in catalyzing oxygen reduction reaction in acidic HClO4 electrolyte. These particles exhibit enhanced mass activity within smaller particles but higher catalyst surface area normalized activity within larger particles.