Synergistic Functionality of Dopants and Defects in Co-Phthalocyanine/B-CN Z-Scheme Photocatalysts for Promoting Photocatalytic CO2 Reduction Reactions |
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| Authors: | Imran Khan Salman Khan Shiuan-Yau Wu Hsin-Tsung Chen Amir Zada Liu Linlin Ahmed Ismail Sharafat Ali Fazal Raziq Mustafa Haider Javid Khan Sami Ullah Shin-pon Ju Shiliang Wang |
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| Affiliation: | 1. School of Physics and Electronics, Central South University, Changsha, 410083 P. R. China;2. Key Laboratory of Functional Inorganic Material Chemistry, The Ministry of Education of the Peoples Republic of China, Heilongjiang University, Harbin, 150080 P. R. China;3. Department of Chemistry, R&D Center for Membrane Technology, and Research Center for Semiconductor Materials and Advanced Optics, Chung Yuan Christian University, Chungli District, Taoyuan City, 320314 Taiwan;4. Department of Chemistry, Abdul Wali Khan University, Khyber Pakhtunkhwa, Mardan, 23200 Pakistan;5. School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054 P. R. China;6. College of Materials Science and Engineering, Hunan University, Changsha, 410082 P. R. China;7. K.A.CARE Energy Research & Innovation Center (ERIC), King Fahd University of Petroleum & Minerals (KFUPM), Dhahran, 31261 Saudi Arabia;8. Department of Mechanical and Electro-Mechanical Engineering, National Sun-Yat-Sen University, 70 Lienhai Rd, Kaohsiung, 804 Taiwan |
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| Abstract: | The realization of solar-light-driven CO2 reduction reactions (CO2 RR) is essential for the commercial development of renewable energy modules and the reduction of global CO2 emissions. Combining experimental measurements and theoretical calculations, to introduce boron dopants and nitrogen defects in graphitic carbon nitride (g-C3N4), sodium borohydride is simply calcined with the mixture of g-C3N4 (CN), followed by the introduction of ultrathin Co phthalocyanine through phosphate groups. By strengthening H-bonding interactions, the resultant CoPc/P-BNDCN nanocomposite showed excellent photocatalytic CO2 reduction activity, releasing 197.76 and 130.32 µmol h?1 g?1 CO and CH4, respectively, and conveying an unprecedented 10-26-time improvement under visible-light irradiation. The substantial tuning is performed towards the conduction and valance band locations by B-dopants and N-defects to modulate the band structure for significantly accelerated CO2 RR. Through the use of ultrathin metal phthalocyanine assemblies that have a lot of single-atom sites, this work demonstrates a sustainable approach for achieving effective photocatalytic CO2 activation. More importantly, the excellent photoactivity is attributed to the fast charge separation via Z-scheme transfer mechanism formed by the universally facile strategy of dimension-matched ultrathin (≈4 nm) metal phthalocyanine-assisted nanocomposites. |
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| Keywords: | charge separation CO
2 reduction reactions cobalt phthalocyanine nitrogen defects and boron dopants Z-scheme charge transfer mechanism |
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