TY - JOUR
T1 - ZIF-8 MOF Encapsulated Co-porphyrin, an Efficient Electrocatalyst for Water Oxidation in a Wide pH Range
T2 - Works Better at Neutral pH
AU - Mukhopadhyay, Subhabrata
AU - Basu, Olivia
AU - Das, Samar K.
N1 - Funding Information:
We thank SERB-DST, Government of India (Project No. EMR/2017/002971), for financial support. S.M. thanks DST INSPIRE, New Delhi, India and O.B. thanks UGC, New Delhi, India for their fellowships. We also acknowledge UGC-CAS. This work is also supported by UGC-BSR-Mid-Career Award project (project No. 19-232/2019(BSR)).
Funding Information:
We thank SERB‐DST, Government of India (Project No. EMR/2017/002971), for financial support. S.M. thanks DST INSPIRE, New Delhi, India and O.B. thanks UGC, New Delhi, India for their fellowships. We also acknowledge UGC‐CAS. This work is also supported by UGC‐BSR‐Mid‐Career Award project (project No. 19‐232/2019(BSR)).
Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2020/11/5
Y1 - 2020/11/5
N2 - 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.
AB - 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.
KW - ZIF-8 MOF
KW - cobalt porphyrin
KW - encapsulation
KW - oxygen evolution reaction
KW - water oxidation
UR - http://www.scopus.com/inward/record.url?scp=85090756895&partnerID=8YFLogxK
U2 - 10.1002/cctc.202000804
DO - 10.1002/cctc.202000804
M3 - Article
AN - SCOPUS:85090756895
SN - 1867-3880
VL - 12
SP - 5430
EP - 5438
JO - ChemCatChem
JF - ChemCatChem
IS - 21
ER -
