Mollar-Cuni, Andrés García-Aznar, Pablo Martín, Santiago Sastre, German García, Hermenegildo Mata, Jose A. Mechanistic Insights in Acceptorless Dehydrogenation of N-Heterocycles Using Graphenes as Carbocatalysts ACS appl. mater. interfaces 10.1021/acsami.5c11895 2025 2025