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| Home > Publications database > Effect of Cr on the hydrogen storage and electronic properties of BCC alloys: Experimental and first-principles study > print |
| 001 | 449197 | ||
| 005 | 20250716151928.0 | ||
| 024 | 7 | _ | |a 10.1016/j.ijhydene.2020.07.186 |2 doi |
| 024 | 7 | _ | |a 0360-3199 |2 ISSN |
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| 100 | 1 | _ | |a Balcerzak, Mateusz |0 P:(DE-H253)PIP1082706 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Effect of Cr on the hydrogen storage and electronic properties of BCC alloys: Experimental and first-principles study |
| 260 | _ | _ | |a New York, NY [u.a.] |c 2020 |b Elsevier |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a Inventing an effective method to store large amounts of hydrogen at room temperature is one of the key challenges in developing a hydrogen-based economy. Metal hydrides have attracted attention owing to their promising hydrogen storage capabilities. We have systematically studied the structural and electronic properties of mechanically synthesized Ti$_{0.5}$V$_{1.5-x}$Cr$_x$ (0 ≤ x ≤ 0.3) alloys and investigated the influence of the addition of Cr atoms on the hydrogen storage properties of vanadium-rich body-centered-cubic (V-BCC) alloys. X-ray diffraction (XRD) results indicate that all alloys are composed of BCC main phase, with the lattice parameters exhibiting no change following chemical modification. The kinetic measurements have revealed that Cr-containing alloys exhibit improved hydrogen uptake. X-ray photoelectron spectroscopy (XPS) measurements have shown that the addition of Cr has a significant effect on the anti-oxidation properties of V-BCC alloys, increasing their chemical activity and thus enhancing the hydrogen storage properties. Moreover, XPS results elucidate the role of activation of the studied materials. Additionally, the electrochemical properties of the negative electrodes (as part of Ni-MH$_x$ secondary batteries) made of Ti$_{0.5}$V$_{1.4-x}$Ni$_{0.1}$Cr$_x$ (0 ≤ x ≤ 0.3) system have been studied by cyclic charge-discharge and demonstrate that doping of the V-BCC alloys with Cr can significantly improve the cycle-life stability of anode that exhibits similar discharge performance up to 50 cycles. First principles simulations are used to analyse the changes in the electronic density of states close to the Fermi level, as a function of Cr concentration, as well as binding energies and structural changes upon hydrogen absorption. Furthermore, ab initio studies confirmed that H absorption is favoured with increasing Cr-content. Our study highlights the importance of the addition of Cr to V-BCC alloys on both solid-gas and electrochemical hydrogenation reactions. |
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| 700 | 1 | _ | |a Robles, Eric |0 P:(DE-H253)PIP1016379 |b 2 |
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| 773 | _ | _ | |a 10.1016/j.ijhydene.2020.07.186 |g p. S0360319920327968 |0 PERI:(DE-600)1484487-4 |n 53 |p 28996 - 29008 |t International journal of hydrogen energy |v 45 |y 2020 |x 0360-3199 |
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