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Interfacial Synergism of Brominated Phthalocyanine and Carbon Nanoparticle-Based Nanocomposite for Efficient Oxygen Electrocatalysisстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Kousar Naseem, Gorbunova Elena A., Dubinina Tatiana V., Lokesh Koodlur Sannegowda
- Журнал: ACS Applied Energy Materials
- Год издания: 2024
- Издательство: American Chemical Society
- Местоположение издательства: United States
- DOI: 10.1021/acsaem.4c01987
- Аннотация: The efficiency of rechargeable metal-air batteries can be significantly improved by utilizing bifunctional oxygen catalysts that are capable of facilitating both the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR). Continuous research efforts are crucial to develop highly efficient and cost-effective bifunctional catalysts for oxygen electrode reactions in various energy conversion and storage applications. This study introduces an innovative approach by harnessing the interfacial synergism of brominated phthalocyanine and carbon nanoparticles. Herein, a cost-effective metal–organic macrocycle featuring octa-bromo-substituted cobalt phthalocyanine, CoOBrPc, is synthesized and comprehensively characterized for its properties and evaluated performance in bifunctional oxygen electrocatalysis. To boost its synergistic performance, an organic-hybrid composite is prepared by strategically incorporating Ketjen black (KB) nanoparticles. The optimized CoOBrPc + KB (4:1 respectively) organic hybrid exhibited outstanding bifunctional oxygen catalytic activity, bearing a minimal potential difference (ΔE) of 518 mV at Eonset and 811 mV at Ej10 and E1/2, on a glassy carbon-rotating disc electrode in a 1.0 M KOH electrolyte at a 5 mV s–1 scan rate and a rotation speed of 1600 rpm. Additionally, the hybrid catalyst exhibited the same overpotential as the standard catalyst (IrO2) toward OER on a Ni foam substrate at j60. Furthermore, the designed hybrid catalyst exhibited a Tafel slope of 64.02 and 63.88 mV dec–1, j0 of 8.24 × 10–6 and 1.33 × 10–5 A cm–2, lower charge transfer resistance, and higher electrochemical active surface area for the OER and ORR, respectively. These promising results are attributed to a combination of factors, including enhanced mass transport at the interface, tailored electronic structure, and tuned surface morphology. Moreover, the composite’s chemical stability and resistance to degradation ensure sustained catalytic activity in demanding operational conditions, positioning it as a compelling choice for energy conversion and storage applications such as electrolyzers and fuel cells, catalyzing both OER and ORR.
- Добавил в систему: Дубинина Татьяна Валентиновна
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