In one embodiment, the catalyst assembly includes a two-dimension (2-D) extensive catalyst having a catalyst crystal plane; and a substrate supporting the 2-D extensive catalyst and having a substrate crystal plane in substantial alignment with the catalyst crystal plane. In certain instances, the catalyst crystal plane includes first and second adjacent catalyst atoms defining a catalyst atomic distance, the substrate crystal plane includes first and second adjacent substrate atoms defining a substrate atomic distance, a percent difference between the catalyst and substrate atomic distances is less than 10 percent.