DataVXACS Applied Materials & InterfacesPaper
journal article·2020-01-08Open access

Unravelling the Photocatalytic Behavior of All-Inorganic Mixed Halide Perovskites: The Role of Surface Chemical States

Andrés F. Gualdrón-Reyes, Jhonatan Rodríguez-Pereira, Eliseo Amado-González, Jorge Rueda-P, Rogelio Ospina, Sofia Masi, Seog Joon Yoon, Juan Tirado, Franklin Jaramillo, Said Agouram, Vicente Muñoz-Sanjosé, Sixto Giménez, Iván Mora-Seró

ACS Applied Materials & Interfaces· Volume 12· Issue 1
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Source abstract

Abstract

Within the most mesmerizing materials in the world of optoelectronics, mixed halide perovskites (MHPs) have been distinguished because of the tunability of their optoelectronic properties, balancing both the light-harvesting efficiency and the charge extraction into highly efficient solar devices. This feature has drawn the attention of analogous hot topics as photocatalysis for carrying out more efficiently the degradation of organic compounds. However, the photo-oxidation ability of perovskite depends not only on its excellent light-harvesting properties but also on the surface chemical environment provided during its synthesis. Accordingly, we studied the role of surface chemical states of MHP-based nanocrystals (NCs) synthesized by hot-injection (H-I) and anion-exchange (A-E) approaches on their photocatalytic (PC) activity for the oxidation of β-naphthol as a model system. We concluded that iodide vacancies are the main surface chemical states that facilitate the formation of superoxide ions, O2●–, which are responsible for the PC activity in A-E-MHP. Conversely, the PC performance of H-I-MHP is related to the appropriate balance between band gap and a highly oxidizing valence band. This work offers new insights on the surface properties of MHP related to their catalytic activity in photochemical applications.
Source: openalex_inverted_index · Quality: baseline

Research context

NanomaterialsElectronic materialsCatalysis & surfaces

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Advanced Photocatalysis Techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratorio de Biocombustibles Lab-IBEAR, Facultad de Ciencias Básicas, Universidad de Pamplona, Pamplona, Norte de Santander 543050, Colombia

Institute of Advanced Materials (INAM), Universitat Jaume I (UJI), Avenida de Vicent Sos Baynat, s/n, 12071 Castellón de la Plana, Spain

Centro de Investigación Científica y Tecnológica en Materiales y Nanociencias (CMN), Universidad Industrial de Santander, Piedecuesta, Santander 681011, Colombia

Grupo de Óptica Moderna, Facultad de Ciencias Básicas, Universidad de Pamplona, Pamplona, Pamplona, Norte de Santander 543050, Colombia

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

Centro de Investigación, Innovación y Desarrollo de Materiales CIDEMAT, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 1226, Colombia

Department of Applied Physics and Electromagnetism, University of Valencia (UV), 46100 Valencia, Spain

Materials for Renewable Energy (MAER), Unitat Mixta d’Investigació UV-UJI, 46010 Valencia, Spain

Funding

Departamento Administrativo de Ciencia, Tecnología e Innovación · Generalitat Valenciana · Ministry of Science, Innovation and Universities · European Commission · Colombia Scientific Program

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