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

Ti49Zr26Ni25 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/MoS2 (C/MoS2) composite. Then, the C/MoS2 hexahedral particles are coated on the Ti49Zr26Ni25 surface by ball-milling. For comparison, the Ti49Zr26Ni25 + ZIF-8-C and Ti49Zr26Ni25 + MoS2 composites are also prepared. The C/MoS2 modified Ti49Zr26Ni25 displays higher hydrogen storage capacity of 279.1 mAh/g than separate ZIF-8-C or MoS2 coated alloy and original Ti49Zr26Ni25. The superior properties may be due to the synergistic effect between high conductive flexible ZIF-8-C porous carbon and active MoS2. The preferable oxidation/corrosion resistance and cyclic stability are also realized. Moreover, Ti49Zr26Ni25 + C/MoS2 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/MoS2 can serve a rapid passageway and accelerate the hydrogen diffusion, thus further improving the kinetic properties and electrochemical activity of Ti49Zr26Ni25 alloy electrode. (C) 2022 Published by Elsevier B.V.

Automated summary

Ti49Zr26Ni25 quasicrystal alloy is prepared and modified with C/MoS2 composite to enhance its hydrogen storage capacity and electrochemical activity. The C/MoS2 composite improves the oxidation/corrosion resistance, cyclic stability, and kinetic properties of the alloy electrode. The synergistic effect between conductive ZIF-8-C porous carbon and active MoS2 contributes to the superior performance of the modified alloy.