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journal article·2022-12-20

Crystallization Pathways and Evolution of Morphologies and Structural Defects of α-MnO2 under Air Annealing

Van-Phuc Dinh, Tuyen Anh Luu, Krzysztof Siemek, Denis P. Kozlenko, Khiem Hong Le, Ngoc Toan Dang, Tiep Van Nguyen, Nguyen Le Phuc, Tap Duy Tran, Phuc T. Phan, Son T. Lo, Kiet Anh Tuan Hoang, Thanh Khan Dinh, Ngoc Thuy Luong, Ngoc Chung Le, Ngoc-Tuan Nguyen, Thien-Hoang Ho, Xuan Dong Tran, Phong D. Tran, Hung Q. Nguyen

Langmuir· Volume 38· Issue 50
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Source abstract

Abstract

Manganese dioxide nanomaterials have wide applications in many areas from catalysis and Li–ion batteries to gas sensing. Understanding the crystallization pathways, morphologies, and formation of defects in their structure is particularly important but still a challenging issue. Herein, we employed an arsenal of X-ray diffraction (XRD), scanning electron microscopy (SEM), neutron diffraction, positron annihilation spectroscopies, and ab initio calculations to investigate the evolution of the morphology and structure of α-MnO 2 nanomaterials prepared via reduction of KMnO 4 solution with C 2 H 5 OH prior to being annealed in air at 200–600 °C. We explored a novel evolution that α-MnO 2 nucleation can be formed even at room temperature and gradually developed to α-MnO 2 nanorods at above 500 °C. We also found the existence of H + or K + ions in the [1 × 1] tunnels of α-MnO 2 and observed the simultaneous presence of Mn and O vacancies in α-MnO 2 crystals at low temperatures. Increasing the temperature removed these O vacancies, leaving only the Mn vacancies in the samples.
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Research context

Energy storageNanomaterialsCatalysis & surfacesMaterials processing

OpenAlex topics: Geochemistry and Elemental Analysis · ZnO doping and properties · Multiferroics and related materials

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

Affiliations

Institute of Fundamental and Applied Sciences, Duy Tan University, 06 Tran Nhat Duat, Ho Chi Minh City700000, Viet Nam

Faculty of Natural Sciences, Duy Tan University, 03 Quang Trung, Da Nang City550000, Viet Nam

Center for Nuclear Technologies, Vietnam Atomic Energy Institute, Ho Chi Minh City700000, Viet Nam

Dzhelepov Laboratory of Nuclear Problems, JINR, Dubna141980, Moscow Region, Russia

Institute of Nuclear Physics, Polish Academy of Sciences, KrakowPL-31342, Poland

Frank Laboratory of Neutron Physics, JINR, Dubna141980, Moscow Region, Russia

Institute of Physics, Viet Nam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi City100000, Viet Nam

Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Ha Noi City100000, Viet Nam

Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang City550000, Viet Nam

Flerov Laboratory of Nuclear Reactions, JINR, Dubna141980, Moscow Region, Russia

Vietnam Petroleum Institute, Ho Chi Minh City700000, Viet Nam

Faculty of Materials Science and Technology, University of Science, VNU−HCMC, 227 Nguyen Van Cu, Ho Chi Minh City700000, Viet Nam

Vietnam National University Ho Chi Minh City, Ho Chi Minh City700000, Viet Nam

Graduate School of Education, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States

University of Science and Education, The University of Da Nang, Da Nang City550000, Viet Nam

DaLat University, Dalat University, 01 Phu Dong Thien Vuong, Da Lat City670000, Viet Nam

Dalat Nuclear Research Institute, 01 Nguyen Tu Luc, Da Lat City670000, Viet Nam

Dong Nai University, Le Quy Don Street, Bien Hoa City, Dong Nai810000, Viet Nam

University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi City100000, Viet Nam

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