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Nanosized Zirconium Porphyrinic Metal–Organic Frameworks that Catalyze the Oxygen Reduction Reaction in Acid
Author(s) -
Chen Gan,
Stevens Michaela Burke,
Liu Yunzhi,
King Laurie A.,
Park Jihye,
Kim Taeho Roy,
Sinclair Robert,
Jaramillo Thomas F.,
Bao Zhenan
Publication year - 2020
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.202000085
Subject(s) - electrocatalyst , particle size , zirconium , catalysis , electrolyte , particle (ecology) , porosity , metal , materials science , chemical engineering , metal organic framework , specific surface area , inorganic chemistry , chemistry , nanotechnology , electrochemistry , electrode , organic chemistry , composite material , metallurgy , oceanography , adsorption , engineering , geology
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 HClO 4 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.