LAUSR

Abstract An industrially attractive electrocatalyst needs to meet a series of criteria such as simple and scalable preparation, robust stability, as well as highly efficient catalytic activity. In this study, we demonstrate that a defect network present within high pure polycrystalline graphite can work as a wonderful matrix of electrocatalysts. The electrodes were prepared simply by drop-casting binder-free catalyst precursor solutions on the graphite surface. The precursor ions can infiltrate into the defect channels up to about 3.6 mm deep. Excellent electrocatalytic activity and robust stability were verified using hydrogen and oxygen evolution reactions with different electrocatalysts. The depth-dependent catalytic activities were measured and the depth-profile analyses were performed. The rigid defect network structure significantly improves structural integrity and robust stability and minimizes the electron transfer barrier. Such sustainable electrocatalysts fixed in a rigid defect network have the potential to provide all the features necessary for industrial applications.