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The microstructures and electrode properties of Cr or Co-doped V_(2.1) TiNi_(0.5) Hf_(0.05)M_ 0.113 (M=Cr, Co) hydrogen storage alloys were investigated. It is found that all alloys consist of a main phase of V-based solid solution with b.c.c. structure and a secondary phase of C14-type Laves phase with a three-dimensional network structure. After the doping of Cr or Co into V_ 2.1TiNi_ 0.5Hf_ 0.05, the abundance and unit cell volume of the main phase decrease, and those of the secondary phase increase. The electrochemical measurements show that the discharge capacities of Cr-doped V_(2.1) TiNi_(0.5) Hf_(0.05)Cr_ 0.113 alloy and Co-doped V_(2.1) TiNi_(0.5) Hf_(0.05)Co_ 0.113 alloy are less than that of V_(2.1) TiNi_(0.5) Hf_(0.05) alloy, but their cycle stability and high-rate dischargeability are improved markedly. The results show that Cr or Co doping into V_(2.1) TiNi_(0.5) Hf_(0.05) alloy is significantly beneficial for the cycling stability.
The microstructures and electrode properties of Cr or Co-doped V_ (2.1) TiNi_ (0.5) Hf_ (0.05) M_0.113 (M = Cr, Co) hydrogen storage alloys were investigated. V-based solid solution with bcc structure and a secondary phase of C14-type Laves phase with a three-dimensional network structure. After the doping of Cr or Co into V_ 2.1 TiNi_ 0.5Hf_ 0.05, the abundance and unit cell volume of the main The phase changes, and those of the secondary phase increase. The electrochemical measurements show that the discharge capacities of Cr-doped V_ (2.1) TiNi_ (0.5) Hf_ (0.05) Cr_0.113 alloy and Co-doped V_ (2.1) TiNi_ The results show that Cr or Co doping into V_ (2.1) TiNi_ (0.5) Hf_ (0.05) alloy, but their cycle stability and high-rate dischargeability are improved significantly. 2.1) TiNi_ (0.5) Hf_ (0.05) alloy is significantly beneficial for the cycling stability.