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- W2002492887 abstract "Deposits of oriented, crystalline M4V6O16+δ·yH2O with M K+, NH4+, Rb+ or Cs+, 0.00⩽δ<0.10 and 0.0⩽y<1.0 have been prepared electrochemically from alkali metal and ammonium metavanadate solutions. These deposits are believed to be formed by formation of a sol at the anode; the sol migrates to the cathode, at which V(IV) is being formed from reduction of metavanadate ion. The sol particles adhere, are partially reduced, and serve as sites for further nucleation and growth. The deposits with M NH4+ can be decomposed to crystalline V2O5 by heating at 300°C for several hours, with attention of their orientation on the substrate. The first two steps of the thermal decomposition in air involve loss of water of crystallization, the third loss of 2NH3+H2O and addition of oxygen to oxidize part of the V(IV), leaving diammonium hexavanadate. In the fourth step, diammonium hexavanadate is further decomposed to produce ammonia and nonstoichiometric V2O5, probably with oxidation of ammonia. In the final step, re-oxidation of V(IV) to V(V) by addition of O2 is accompanied by recrystallization to form stoichiometric V2O5. Reversible electrochemical insertion and removal of lithium can be carried out, using the V2O5 form of the deposit, up to a mole ratio Li/V2O5=1.2. However, electrodes that are not decomposed cycle poorly and insert only a small amount of lithium, <1% of the total V." @default.
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- W2002492887 date "1990-02-01" @default.
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- W2002492887 title "Vanadium pentoxide electrodes. II. Cathodic electrodeposition of mixed-valence ammonium and alkali metal hexavanadates" @default.
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- W2002492887 doi "https://doi.org/10.1016/0167-2738(90)90239-n" @default.
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