Iodine‐Doped Cobalt Phthalocyanine Supported on Multiwalled Carbon Nanotubes for Electrocatalysis of Oxygen Reduction Reaction

Abstract

4‐(4,6‐Diaminopyrimidin‐2‐ylthio) phthalocyaninatocobalt(II) (CoPyPc) was iodine doped, and its electrocatalytic properties explored. Physical characterization techniques such as UV‐vis, X‐ray photoelectron, electron paramagnetic resonance and infra‐red spectroscopy were used. Cyclic voltammetry, electrochemical impedance spectroscopy and rotating disk electrode were used for electrochemical characterization of electrodes modified with the prepared phthalocyanine and its nanocomposites. The electrocatalytic effect of a new iodine‐doped cobalt phthalocyanine derivative supported on multiwalled carbon nanotubes was then investigated towards oxygen reduction reaction. The electrocatalytic activity of the iodine‐doped cobalt phthalocyanine was found to be superior in terms of current over the undoped phthalocyanine nanocomposite.

Characterization and Electrocatalytic Activity of Nanocomposites Consisting of Nanosized Cobalt Tetraaminophenoxy Phthalocyanine, Multi‐walled Carbon Nanotubes and Gold Nanoparticles

“…AuNPs (alone or as composites) have been employed for the detection of a variety of analytes including hydrogen peroxide, hydrazine and nitrite . On the other hand, the recent intense interest in the carbon based nanomaterials (such as multiwalled carbon nanotubes, MWCNTs) has also made a significant impact in the electrocatalytic detection of a wide range of analytes of environmental and biomedical importance , as well as oxygen reduction reactions among others. Carbon nanotubes promote electron transfer in electrochemical reactions and improve sensitivity , hence are employed in electrode modification in this work.…”

“…Phthalocyanines (Pcs) are well known electrocatalysts . Transforming Pcs into nanoparticles has recently opened a new interest in the electrocatalytic detection of a number of physiologically important molecules .…”

Novel Heteroatom-Doped Fe/N/C Electrocatalysts With Superior Activities for Oxygen Reduction Reaction in Both Acid and Alkaline Solutions

“…In the last decade, enormous efforts have been made for developing high-performance and cost-effective noble metalfree catalysts for ORR (Dai et al, 2015;Chung et al, 2017;Gewirth et al, 2018;Li et al, 2018;Xue et al, 2018). These electrocatalysts were based on various kinds of heteroatoms, transition metals, nitrogen and carbon precursors, such as carbon-supported nitrogen and transition metals-doped catalytic materials (Bezerra et al, 2008;Jaouen et al, 2011;Higgins and Chen, 2013;Rauf et al, 2016), dual heteroatom-doped carbon nanotubes or graphene Nyoni et al, 2015;Rauf et al, 2017), metals-N 4 macrocycles (Jasinski, 1964;Seo et al, 2014), heteroatoms doped carbon nanomaterials Liu et al, 2019;Wu et al, 2019), etc., which showed high catalytic activity, stability, and high tolerance to small alcohol molecules or CO poisoning (Qu et al, 2010). Among them, carbon-supported nanomaterial with heteroatoms doping (e.g., Co, Fe, N, S, P, and halogens) were widely developed, and they are promising non-precious electrocatalysts to substitute Pt group metal (PGM)-free electrocatalysts for ORR (Gong et al, 2009;Yang et al, 2012;Yao et al, 2012;Zhang and Dai, 2012;Jeon et al, 2013;Chen et al, 2017;You et al, 2018).…”

“…Among them, carbon-supported nanomaterial with heteroatoms doping (e.g., Co, Fe, N, S, P, and halogens) were widely developed, and they are promising non-precious electrocatalysts to substitute Pt group metal (PGM)-free electrocatalysts for ORR (Gong et al, 2009;Yang et al, 2012;Yao et al, 2012;Zhang and Dai, 2012;Jeon et al, 2013;Chen et al, 2017;You et al, 2018). Sulfur and halogens (F and I) had been introduced as active additives in Fe/N/C or Co/N/C electrocatalysts to improve the electrocatalytic performance (Chen et al, 2015;Nyoni et al, 2015;Wang Y.-C. et al, 2018;Zheng et al, 2019). The dual-doping of non-precious metals (Fe, Co, etc.)…”

Current mapping of lead phthalocyanine thin films in the presence of gaseous dopants

“…The doping concept has been utilized in various applications such as lithium-ion batteries and oxygen reduction reactions for lowering charge transfer resistance across the electrode/electrolyte interface. 12,13 Iodine doped organic systems have also been applied in organic photovoltaics to achieve enhanced photocurrent generation and NIR absorption. 14,15 The semiconducting behavior of these molecules also gets affected significantly due to the presence of different gaseous species in the atmosphere and is exploited for sensing applications.…”