Oxygen reduction reaction catalyzed by cobalt(III) complexes of macrocyclic ligands supported on multiwalled carbon nanotubes

Polydopamine-Coated Manganese Complex/Graphene Nanocomposite for Enhanced Electrocatalytic Activity Towards Oxygen Reduction

“…It also showed higher current density. A similar observation was also shown for a previously published Co nanocomposite supported on graphene when compared to MWCNT 19 . Thus, we found that the graphene to be a better catalyst support material for ORR.…”

“…In acidic media, the rate constant was 1.3 × 10 6 mol −1 s −1 , which is larger than that of a similar Co electrocatalyst 18 . When compared to other ORR electrocatalysts that have been developed, this rate constant is higher than that of a Co-MWCNT electrocatalyst (1.62 × 10 5 mol −1 s −1 ) 19 and a Co-graphene catalyst (3.85 × 10 5 mol −1 s −1 ) 18 . In alkaline conditions, the rate constant decreased slightly to 2.50 × 10 5 mol −1 s −1 .…”

“…Metal complexes supported on carbonaceous nanomaterials, such as a Co-porphyrin supported on MWCNT 15 , a Mn tetrakis(4-hydroxyphenyl)porphyrin catalyst immobilized on poly(sodium- p -styrenesulfonate) modified reduced graphene oxide 16 , and an Fe-phthalocyanine anchored on single-walled carbon nanotubes 17 , have demonstrated excellent activities as ORR electrocatalysts. Previously, we have employed a Co(III) catalyst of an amidomacrocyclic ligand supported on graphene and MWCNTs for ORR 18 19 . The planar geometry of the complex, which contains empty coordination sites on the metal, along with multiple sources of π-electrons (i.e.…”

Simultaneous Electrochemical Deposition of Cobalt Complex and Poly(pyrrole) Thin Films for Supercapacitor Electrodes

“…Over the past few decades, extensive efforts have been made to design catalytic materials bearing macrocyclic metal N 4 complexes such as porphyrin and phthalocyanines 25,26 . The macrocyclic metal N 4 complexes with different transition metals have been identified as a promising electrode material for fuel cells 27–29 and lithium-air (Li 2 O 2 ) battery 30 . Recently, we demonstrated the use of macrocyclic Co(III) 31 and Mn(III) N 4 complexes coated with polydopamine 32 and supported on graphene as a promising electrocatalyst for oxygen reduction reaction (ORR).…”

Electrocatalytic reduction of CO2 to CO by Gd(III) and Dy(III) complexes; and M2O3 nanoparticles (M = Gd and Dy)

“…This growing research effort is a response by physical scientists and engineers to the increasing amount of CO 2 in the atmosphere and the steady growth in global fuel (energy) demand [6,7]. Electroreduction of CO 2 with metal complexes is a feasible technique for the utilization of CO 2 as a C 1 source, though the final products usually have been limited to CO and/or HCOOH [8][9][10][11][12][13][14][15][16]. Metal complexes with CO 2 as a ligand are considered to play the key role in the electroreduction and photoreduction of CO 2 , since the MÀ Àh 1 À ÀCO 2 bond is easily converted to metal-CO bond through an acid-base reaction in protic media (such as water and alcohols) or through an oxide-transfer to a free CO 2 molecule (uncoordinated CO 2 ) in aprotic media (such as CH 3 CN).…”