Recent Advancement in Pd-Decorated Nanostructures for Its Catalytic and Chemiresistive Gas Sensing Applications: A Review

In view of their unique characteristics and properties, palladium decorated nanostructures have been used not only in the field of nanomedicine, nanodrug delivery, automobiles, construction, and agrochemical but also for diverse advanced catalytic technologies and gas sensing applications. This comprehensive review sheds light on general synthetic approaches encompassing hydrothermal synthesis, co-precipitation, solvothermal, sol–gel, and thermal treatment, among the preparative methods for the syntheses of Pd-decorated nanostructures and their catalytic and chemiresistive gas sensing applications. In addition to this, fundamental aspects of being an ideal nanomaterial are also discussed, such as morphology, selectivity, stability, reproducibility of the material. Moreover, inthe case of catalytic applications, various reactions such as coupling, addition, oxidation, reduction, hydrogenation, water splitting, etc. The Pd-decorated nanostructures are used as catalysts, and their interference has been explained. While, for the gas sensing application, an overview of the wealth of material, methods, and sensing mechanisms like response time, analytical ranges, and operating temperatures are also explained. Furthermore, the rise and journey of Pd-decorated based catalysts and gas sensors will inspire a new generation of chemists to tailor and design robust catalysts and sensors that can effectively tackle major environmental challenges and help replace noble metals in advanced catalytic and sensing applications.