High entropy metal oxide/TiO2 based heterostructures for selective CO2 detection

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F25%3A63599358" target="_blank" >RIV/70883521:28610/25:63599358 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

High entropy metal oxide/TiO2 based heterostructures for selective CO2 detection

Original language description

Examining the air quality in the environment, particularly in closed spaces, via the detection of different types ofgases like acetone, formaldehyde, carbon monoxide, methane, carbon dioxide, etc., is a fundamental requirement.Different metal oxides have been employed for the detection of gases. TiO2 is preferred due to its high temperature,chemical and mechanical stabilities. However, TiO2-based sensors required high operating temperatures (200-400C) to reach good sensitivity. Hence, currently it is important to explore other novel materials to selectively detectCO2 gas with a wide range of concentrations at low working temperatures with enhanced response/ recovery timeand sensitivity. The making of a heterostructure with different types of materials is an effective strategy to enhancethe gas sensor response and selectivity. Recently emerged high entropy metal oxide (HEMO) can be used aseffective gas sensor for the detection of CO2 because of it has large surface-to-volume ration, more surface-activesites, and intrinsic oxygen vacancies. Also, HEMO has high electrical conductivity at room temperature, and itcan be useful for the sensor to reduce power consumption. In this work, we synthesized five elements based HEMOby the auto-combustion method. Here, HEMO-TiO2 heterostructure was synthesized by ultrasonic treatment ofHEMO-TiO2 mixture in water. Commercial TiO2 powder has been used for this heterostructure preparation.Consequently, gas sensing properties of the above-mentioned heterostructure can exhibit improved sensingperformance at low temperature. Polyaniline (PANI) is a widely investigated conducting polymer in CO2 gassensors owing to its high electric conductivity, unique redox and doping properties, which lead to high conductivitytuning upon exposure to CO2 gas molecules. PANI is useful for sensing at room temperature, making it a goodcandidate for real-time sensing. In future work, we will prepare HEMO-TiO2-PANI-based heterostructure for CO2sensing at room temperature with high sensitivity.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

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Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů