“…[9][10][11][12][13][14][15][16][17][18][19] For example, the former electrocatalyst category includes Pt nanoparticles supported on carbon nanomaterials 5,6 and Pt-and Ru-based single-atom catalysts. 7,8 The latter category includes earth-abundant transition metal-based compounds, such as oxides, 9,10 phosphides, 11-13 nitrides [14][15][16] and chalcogenides. 17,18 While most transition metals are relatively abundant, there is a high possibility that key electrocatalytic transition metal elements, particularly Co, have limited availability due to mass consumption in the rapidly growing Li-ion battery industry.…”