Enhanced electrochemical hydrogen storage performance of Ti49Zr26Ni25 quasicrystal alloy by coating with ZIF-8 derived porous carbon/MoS2 composite

Abstract

Ti 49 Zr 26 Ni 25 quasicrystal alloy is prepared via mechanical alloying and subsequent annealing. ZIF-8 derived porous carbon (ZIF-8-C) is obtained through thermal treatment of zinc-based MOF ZIF-8. The solvothermal method is used to fabricate the ZIF-8 derived carbon/MoS 2 (C/MoS 2 ) composite. Then, the C/MoS 2 hexahedral particles are coated on the Ti 49 Zr 26 Ni 25 surface by ball-milling. For comparison, the Ti 49 Zr 26 Ni 25 + ZIF-8-C and Ti 49 Zr 26 Ni 25 + MoS 2 composites are also prepared. The C/MoS 2 modified Ti 49 Zr 26 Ni 25 displays higher hydrogen storage capacity of 279.1 mAh/g than separate ZIF-8-C or MoS 2 coated alloy and original Ti 49 Zr 26 Ni 25 . The superior properties may be due to the synergistic effect between high conductive flexible ZIF-8-C porous carbon and active MoS 2 . The preferable oxidation/corrosion resistance and cyclic stability are also realized. Moreover, Ti 49 Zr 26 Ni 25 + C/MoS 2 electrode exhibits higher exchange current density I 0 , limiting current density I L , hydrogen diffusion coefficient D and lower charge-transfer resistance R ct . The distinctive structural feature of C/MoS 2 can serve a rapid passageway and accelerate the hydrogen diffusion, thus further improving the kinetic properties and electrochemical activity of Ti 49 Zr 26 Ni 25 alloy electrode. • A facile solvothermal method is used to prepare ZIF-8 derived carbon/MoS 2 composite. • Ti 49 Zr 26 Ni 25 quasicrystal alloy coated with C/MoS 2 is obtained via ball milling. • The hydrogen storage capacity, HRD and kinetics performance of electrodes are improved. • The synergistic effect of MoS 2 and ZIF-8-C is advantageous to the hydrogen diffusion.