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From superconductor to photocatalyst: Bi₂Sr₂CaCu₂O₈₊x as an efficient visible-light photocatalyst for organic dye degradation.

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Title: From superconductor to photocatalyst: Bi₂Sr₂CaCu₂O₈₊x as an efficient visible-light photocatalyst for organic dye degradation.
Authors: Wang, Nan1 (AUTHOR), Wang, Haiyang1 (AUTHOR), Feng, Ruobing1 (AUTHOR), Li, Xiyu1 (AUTHOR), Liu, Wenbin2 (AUTHOR), Zhang, Weiwei1,3 (AUTHOR) zwwno_1@163.com, Xu, Jiayao1,3 (AUTHOR) xu880315@163.com, Zhang, Bowen1,4 (AUTHOR) zhangbwz@163.com
Source: Journal of Alloys & Compounds. Feb2026, Vol. 1056, pN.PAG-N.PAG. 1p.
Subjects: High temperature superconductors, Photocatalysis, Photodegradation, Environmental remediation, Photocatalysts, Superconductors, Nanostructured materials
Abstract: The high-temperature superconductor Bi 2 Sr 2 CaCu 2 O 8+ x (Bi2212) has attracted considerable attention in the field of superconductivity due to its unique copper-oxygen layered structure and strong electron correlation effects. In this study, we innovatively extend the application of Bi2212 to the field of photocatalysis. Using a glycine-nitrate combustion method followed by high-temperature calcination at 830–880℃, Bi2212 nanosheets were successfully synthesized. We systematically investigated their dual functionality in both superconductivity and photocatalytic degradation of organic pollutants for the first time. The sample calcined at 850℃ (Bi2212–850) exhibits excellent photocatalytic activity under visible-light irradiation. It demonstrates a photodegradation rate for Rhodamine B (RhB) reaching 0.0956 min−1, achieving 100 % degradation efficiency along with good cycling stability. This remarkable performance originates from the synergistic effect of lattice oxygen and oxygen vacancies. We propose a possible photocatalytic degradation mechanism, realizing for the first time the transformation of the superconducting material Bi2212 into a highly efficient photocatalyst. This work not only reveals the potential of Bi2212 in photocatalysis but also provides a new perspective for designing multifunctional oxide materials. • High-crystallinity Bi2212 nanosheets were successfully synthesized via a glycine-nitrate combustion method. • Optimal sintering at 850°C, Bi2212–850 nanosheets have superior crystallinity and the highest photocatalytic activity. • Radical trapping experiments identified superoxide radicals (·O₂⁻) and holes (h⁺) as the primary active species responsible for the efficient photodegradation of RhB. • Bi2212 is confirmed as a p-type semiconductor with a narrow band gap (∼0.88 eV) and broad visible-light absorption, underpinning its high photocatalytic performance and potential for environmental remediation. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The high-temperature superconductor Bi 2 Sr 2 CaCu 2 O 8+ x (Bi2212) has attracted considerable attention in the field of superconductivity due to its unique copper-oxygen layered structure and strong electron correlation effects. In this study, we innovatively extend the application of Bi2212 to the field of photocatalysis. Using a glycine-nitrate combustion method followed by high-temperature calcination at 830–880℃, Bi2212 nanosheets were successfully synthesized. We systematically investigated their dual functionality in both superconductivity and photocatalytic degradation of organic pollutants for the first time. The sample calcined at 850℃ (Bi2212–850) exhibits excellent photocatalytic activity under visible-light irradiation. It demonstrates a photodegradation rate for Rhodamine B (RhB) reaching 0.0956 min−1, achieving 100 % degradation efficiency along with good cycling stability. This remarkable performance originates from the synergistic effect of lattice oxygen and oxygen vacancies. We propose a possible photocatalytic degradation mechanism, realizing for the first time the transformation of the superconducting material Bi2212 into a highly efficient photocatalyst. This work not only reveals the potential of Bi2212 in photocatalysis but also provides a new perspective for designing multifunctional oxide materials. • High-crystallinity Bi2212 nanosheets were successfully synthesized via a glycine-nitrate combustion method. • Optimal sintering at 850°C, Bi2212–850 nanosheets have superior crystallinity and the highest photocatalytic activity. • Radical trapping experiments identified superoxide radicals (·O₂⁻) and holes (h⁺) as the primary active species responsible for the efficient photodegradation of RhB. • Bi2212 is confirmed as a p-type semiconductor with a narrow band gap (∼0.88 eV) and broad visible-light absorption, underpinning its high photocatalytic performance and potential for environmental remediation. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2026.186564