Discover Materials· 2026Q1
Coordination organic framework of phthalocyanine with carbon nanotubes for elevating oxygen evolution reaction
- 0citations
- Q1SCImago
- 2026year
Short summary
A composite catalyst of cobalt tetracarboxylicacid phthalocyanine (CoTCPc) and multi-walled carbon nanotubes (MWCNTs) achieved a low overpotential of 360 mV at 100 mA cm⁻², significantly outperforming individual components and benchmark RuO₂ (400 mV) for the oxygen evolution reaction.
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Key points
- A CoTCPc/MWCNT composite catalyst was synthesized for oxygen evolution reaction (OER).
- The hybrid catalyst achieved an overpotential of 360 mV at 100 mA cm⁻², outperforming CoTCPc (470 mV), MWCNT (480 mV), and RuO₂ (400 mV).
- Enhanced reaction kinetics were observed with a Tafel slope of 94 mV dec⁻¹, compared to 146 mV dec⁻¹ for CoTCPc.
- The catalyst demonstrated stable operation for over 35 hours at 100 mA cm⁻².
AI-generated from the title and abstract; the full text is not read.
Abstract
The designing and development of efficient, affordable, and effective electrocatalysts for the oxygen evolution reaction (OER) is crucial for advancing sustainable water-splitting technologies. In this study, coordination metal organic framework of cobalt tetracarboxylicacid phthalocyanine (CoTCPc) is synthesized using a standard conventional method and then combined with multi-walled carbon nanotubes (MWCNTs) through a simple physical grinding technique to produce a CoTCPc/MWCNT composite catalyst. The successful synthesis and structural characteristics of CoTCPc and the composite are confirmed through extensive physicochemical analysis, including Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), Raman spectroscopy, Brunauer–Emmett–Teller (BET) surface area, scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), and transmission electron microscopy (TEM). Electrochemical studies revealed that the CoTCPc/MWCNT hybrid catalyst showed significantly improved performance compared to its individual components and bare nickel foam (NF). Remarkably, the Ni/CoTCPc/MWCNT achieved a low overpotential of 360 mV at 100 mA cm − 2 , outperforming pristine CoTCPc (470 mV), MWCNT (480 mV), and benchmark RuO 2 (400 mV) at the same current density. Additionally, the CoTCPc/MWCNT catalyst demonstrated enhanced reaction kinetics with a reduced Tafel slope of 94 mV dec − 1 , compared to CoTCPc (146 mV dec − 1 ), MWCNT (137 mV dec − 1 ) and bare NF (170 mV dec − 1 ). The improved performance is attributed to enhanced charge transfer and better dispersion of active sites facilitated by the conductive MWCNT network. Moreover, the catalyst showed stable operation for over 35 h during chronopotentiometric testing at a current density of 100 mA cm − 2 . This research work presents a simple and scalable approach to boost the electrocatalytic performance of molecular cobalt phthalocyanine systems by integrating them with conductive carbon supports, offering a promising strategy for efficient OER electrocatalysis.
The authors' abstract, as published at the source. Discover Materials, 2026 · DOI ↗
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