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ZIF‐8 MOF Encapsulated Co‐porphyrin, an Efficient Electrocatalyst for Water Oxidation in a Wide pH Range: Works Better at Neutral pH
Author(s) -
Mukhopadhyay Subhabrata,
Basu Olivia,
Das Samar K.
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202000804
Subject(s) - electrocatalyst , imidazolate , overpotential , metal organic framework , catalysis , electrochemistry , zeolitic imidazolate framework , chemistry , oxygen evolution , cobalt , inorganic chemistry , polyoxometalate , porphyrin , water splitting , metal , photochemistry , electrode , organic chemistry , adsorption , photocatalysis
Water oxidation (WO) is the most important and thermodynamically challenging process associated with water splitting. Several metal porphyrins are reported to perform catalytic WO through the central metal but [5,10,15,20‐tetrakis(4‐methoxyphenyl)porphyrinato]cobalt(II) (abbreviated as CoTMPP), which is well‐known for its ability to perform oxygen reduction reaction (ORR), lacks the capacity to perform WO. Here we have successfully activated CoTMPP towards electrochemical WO by means of its in situ encapsulation inside the cavity of a versatile metal organic framework (MOF), known as zeolitic imidazolate framework‐8 (ZIF‐8). The composite, thus prepared i. e ., CoTMPP@ZIF‐8 (abbreviated as CTMZ‐8 ), behaves as a heterogeneous, robust, and efficient electrocatalyst for oxygen evolution reaction (OER) at a wide pH range (from acidic to neutral). Required overpotential (η) of 387.4 mV (neutral pH) and 562.7 mV (pH 2) and high turnover frequency (TOF) of 2.7 s −1 (at neutral pH) make this composite ( CTMZ‐8 ) an efficient electrocatalyst for WO. To the best of our knowledge, this is the first report of electrocatalytic WO by CoTMPP.