Abstract
Hydrogen energy as the main path to accomplish the goal of carbon neutrality, sensors for hydrogen leak detection will become an essential component of the entire hydrogen industry chain. Among the various types of H2 sensors, palladium-based chemiresistive sensors are one of the most promising sensing systems due to their process simplicity and low cost. In this review, we first outline the latest technological advances made to improve hydrogen selectivity and response and identify Pd-based nanomaterials as the most promising candidates. The second part discusses the effects of different types of Pd nanomaterials and Pd alloy nanomaterials on hydrogen sensing. In addition, a comprehensive review of key advances and strategies for hydrogen sensors based on various Pd-based complexes, including metal oxides, carbon-based materials, Mxene, metal-organic framework, and others, is presented. The discussion of each material elucidates smethodologies in the pursuit of manufacturing high-quality hydrogen sensors. Finally, the outlook and future directions for the development of Pd-based hydrogen sensors is provided.
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