Polybenzimidazole and Polybenzimidazole/MoS2 Hybrids as an Active Nitrogen Sites: Hydrogen Generation Application, M. Dinari, A. Nabiyan, Ali A. Ensafi, M. Jafari-Asl, , RSC Advances, 2015, 5, 100996-101005.
Development of free metal or non-noble-metal catalysts for electrode materials with both excellent activity and high stability is essential for hydrogen production. In this work, nitrogen rich polybenzimidazole (PBI) networks were synthesized through a one-step polycondensation of 1,2,4,5-tetraaminobenzene with 4,4 0 ,4 00 -((1,3,5-triazine-2,4,6-triyl)tris(azanediyl))tribenzoic acid. Then, organic/inorganic nanohybrids of PBI with amorphous MoS 2 nanoplates (PBI – MoS 2 ) were prepared. The structural characterization and morphological of these novel hybrids were studies using FT-IR, H NMR, elemental analysis, thermogravimetry, transmission electron microscopy, ﬁ eld-emission scanning electron microscopy and X-ray di ﬀ raction techniques. Electrochemical studies revealed the onset potential of only ( 160 mV vs. RHE) with a small Tafel slope of 50.6 mV dec 1 for hydrogen generation reaction in 0.5 mol L 1 H 2 SO 4 . Stability tests through long term potential cycles con ﬁ rm the excellent durability of PBI – MoS 2 in acid media. The outstanding hydrogen generation activity is derived from the electronic penetration e ﬀ ect and H + absorption of pyridinic-N and/or pyrrolic-N as active sites at per repeat of the PBI matrix. It is worth noting that pure PBI and PBI – MoS 2 hybrids, for the ﬁ rst time, were used as both anode and cathode in two-electrode system open up new possibilities for exploring overall hydrogen generation technology catalysts in acidic electrolyte. This development o ﬀ ers an attractive electrocatalyst for largescale hydrogen generation.