The Cu2CoSnS4 (CCTS) nanofibers featured on the Inside Back Cover were fabricated through electrospinning and used as a catalyst for the production of hydrogen in biphasic liquid systems (water/1,2-dichloroethane (DCE) interfaces). The catalytic activity was compared with that of Cu2ZnSnS4 (CZTS) nanofibers and in situ formed Pt particles. CCTS and CZTS nanofibers, based on abundant and environmental friendly elements, efficiently enhanced the rates of biphasic proton reduction in the presence of an organic solubilized electron donor, decamethylferrocene (DMFc) and showed highly comparable rates of catalysis to noble Pt particles. More details can be found in the Communication by I .H. Patir, M. Kus, et al. (DOI: 10.1002/cnma.201500113).