Hu, K. L., Ohto, T., Chen, L. H., Han, J. H., Wakisaka, M., Nagata, Y., Fujita, J., & Ito, Y. (2018). Graphene Layer Encapsulation of Non-Noble Metal Nanoparticles as Acid-Stable Hydrogen Evolution Catalysts. ACS Energy Letters, 3(7), 1539-1544. doi:10.1021/acsenergylett.8b00739.