Recent Advances in Multi‐Walled Carbon Nanotubes for High‐Efficient Solid‐State Hydrogen Storage: A Review

Abstract This review highlights the promising potential of multi‐walled carbon nanotubes (MWCNTs) for solid‐state hydrogen storage due to their high surface area, low mass density, and chemical stability. Recent advances in doping and functionalization of MWCNTs have demonstrated enhanced hydrogen adsorption capacities that are closer to the United States Department of Energy targets. Transition metal atom doping has been shown to significantly improve hydrogen binding through spillover mechanisms. Additionally, metal doping of MWCNTs exhibited impressive gravimetric and volumetric hydrogen storage capacities. These developments represent a crucial step toward realizing safe, efficient, and cost‐effective solid‐state hydrogen storage solutions enabled by tailored MWCNTs for clean energy applications. Hence, this review aims to summarize the findings on the use of MWCNTs for hydrogen storage, where challenges are discussed and recommendations are provided.