A constellation of
technologies has been researched with an eye
toward enabling a hydrogen economy. Within the research fields of
hydrogen production, storage, and utilization in fuel cells, various
classes of materials have been developed that target higher efficiencies
and utility. This Review examines recent progress in these research
fields from the years 2011–2021, exploring the most commonly
occurring concepts and the materials directions important to each
field. Particular attention has been given to catalyst materials that
enable the green production of hydrogen from water, chemical and physical
storage systems, and materials used in technical capacities within
fuel cells. The quantification of publication and materials trends
provides a picture of the current state of development within each
node of the hydrogen economy.