The role of surface chemical states on the photocatalytic behavior of all-inorganic mixed halide perovskite nanocrystals

Andrés Fabián Gualdrón-Reyes^a^,^b, Jhonatan Rodríguez-Pereira^c, Eliseo Amado-González^b, Jorge-Enrique Rueda-P^d, Rogelio Ospina^c, Sofia Masi^a, Seog Joon Yoon^e, Juan Tirado^f, Franklin Jaramillo^f, Said Agouram^g^,^h, Vicente Muñoz-Sanjosé^g^,^h, Sixto Giménez^a^,^h, Iván Mora-Seró^a^,^h

^aUniversitat Jaume I, Institute of Advanced Materials (INAM) - Spain, Avinguda de Vicent Sos Baynat, Castelló de la Plana, Spain

^bBiofuels Lab-IBEAR, Faculty of Basic Sciences, University of Pamplona, Pamplona, Colombia. C. P. 543050

^cCentro de Investigación Científica y Tecnológica en Materiales y Nanociencias (CMN), Universidad Industrial de Santander, Piedecuesta, Santander, Colombia. C.P. 681011

^dModern Optic Group, Faculty of Basic Sciences, University of Pamplona, Pamplona, Colombia. C. P. 543050

^eDepartment of Chemistry, College of Natural Science, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea

^fCentro de Investigación, Innovación y Desarrollo de Materiales – CIDEMAT, Universidad de Antioquia UdeA, Calle 70, 52-21, Medellín, Colombia

^gDepartment of Applied Physics and Electromagnetism, University of Valencia (UV), Spain, Valencia, Spain

^hUnitat Mixta d’Investigació UV-UJI, Materials for Renewable Energy (MAER), Spain

NIPHO
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)

Sevilla, Spain, 2020 February 23rd - 25th

Organizer: Hernán Míguez

Oral, Andrés Fabián Gualdrón-Reyes, presentation 023
DOI: https://doi.org/10.29363/nanoge.nipho.2020.023
Publication date: 25th November 2019

Mixed halide perovskites (MHP) have been highlighted as promissory materials in optoelectronics, due to their improved light harvesting, photocarrier generation, and the ease for tuning their optical properties, specially their band gap.[1] These features have opened the door to analogous solar driven process as photocatalysis for carrying out the photodegradation of recalcitrant organic compounds more efficiently.[2] Nonetheless, the photocatalytic (PC) activity of MHP mainly depends on the surface chemical environment formed during their synthesis. This correlation has not been studied yet. In this work, we deduced the nature and the role of surface chemical states of MHP nanocrystals (NC) synthesized by hot-injection (H-I) and anion-exchange (A-E) methods, on their PC performance for the oxidation of β‑naphthol as a model system. We identified iodide vacancies as the main surface chemical states that promote the formation of highly reactive superoxide ions. These species define the PC activity of A‑E-MHP. Conversely, the PC performance of H-I-MHP is dictated by an adequate balance between band gap and highly oxidizing valence band. In this context, MHP can be considered as good photocatalysts for efficient environmental remediation.

References:

[1] Wu, Y.; Wang, P.; Guan, Z.; Liu, J.; Wang, Z.; Zheng, Z.; Jin, S.; Dai, Y.; Whangbo, M.-H.; Huang, B. Enhancing the Photocatalytic Hydrogen Evolution Activity of Mixed-halide Perovskite CH3NH3PbBr3-xIx Achieved by Bandgap Funneling of Charge Carriers. ACS Catal. 2018, 8, 11, 10349-10357.

[2] Huang, H.; Yuan, H.; Janssen, K.; Solís-Fernández, G.; Wang, Y.; Tan, C. Y. X. Jonckheere, D.; Debroye, E.; Long, J.; Hendrix, J.; Hofkens, J.; Steele, J. A S.; Roeffaers, M.-B.-J. Efficient and Selective Photocatalytic Oxidation of Benzylic Alcohols with Hybrid Organic–Inorganic Perovskite Materials ACS Energy Lett. 2018, 3, 4, 755-759.

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