Abstract

As not to fall short of the goal to meet 18% of global energy demand with Hydrogen (H₂) by 2050 the critical progresses are needed in global H₂ energy production, environmental requirements, and safety technologies. Due to the unique physical properties of Hydrogen the H₂ energy systems require a total safety from production to end-user utilization stage. Especially metal oxide nanosensors for H₂ detection have the multidimensional development and application potentials. High sensitive, selective, stable, costeffective H₂ nanosensors with fast response-recovery times at different temperature ranges and especially room temperature are of great significance for the safe application and the public acceptance of a H₂ energy economy on global scale. Metal oxide H₂ nanosensor technology shows great progresses to facilitate the implementation of the H₂ energy applications.