Fig. 1: Synthetic route of the hollow heterojunctions.
From: CoO-Mo2N hollow heterostructure for high-efficiency electrocatalytic hydrogen evolution reaction

Schematic illustration of the formation process of CoO-Mo2N hollow heterojunctions.
From: CoO-Mo2N hollow heterostructure for high-efficiency electrocatalytic hydrogen evolution reaction

Schematic illustration of the formation process of CoO-Mo2N hollow heterojunctions.