Zinc electrodes were cycled against segmented counterelectrodes, with the current to the individual segments of the counterelectrodes being controlled throughout cycling. The experimental results gave direct evidence that concentration cells were being established across the faces of the electrodes. Despite the existence of these concentration cells, the distribution of zinc and the rate of shape change in the cycled zinc electrodes were found to be independent of the current patterns imposed on the counterelectrode segments. However, when the separations between the counterelectrode segments were electrolyte-filled channels, the zinc electrode shape change was directly related to the size of that separation. This behavior can be explained by electrolyte flowing in the cell stack acting as the driving force for shape chang e . ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 138.251.14.35 Downloaded on 2015-03-30 to IP Vol. 134, No. 4 ZINC ELECTRODE SHAPE CHANGE 783 ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 138.251.14.35 Downloaded on 2015-03-30 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 138.251.14.35 Downloaded on 2015-03-30 to IP ABSTRACTThe electrochemical characteristics of polyvinylferrocene (PVF) was investigated for use as an electrode-active material in rechargeable batteries. Charge-discharge curves of the PVF electrodes showed excellent potential flatness and very high coulombic efficiencies in both nonaqueous and aqueous solutions. The dispersion of graphite powder in PVF was very useful for increasing the discharge rate and PVF utilization. The self-discharge rates were found to be as low as 1% in the first day. It is concluded that PVF is a promising material as an electrode-active material in rechargeable batteries.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 138.251.14.35 Downloaded on 2015-03-30 to IP

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The formation of crystals on tungsten and molybdenum wires in moist hydrogen is described. The growth results from transport reactions with volatile oxides corresponding to the equation Me + xH,O + MeO,(,) + xH,.Tungsten showed besides already published growth forms also needle-like crystals with -direction and {llO}-faces. The {llO}-faces are mostly imperfect by hollow shapes. The phenomenon may be explained by inhomogenities of supersaturation on the crystal surface and is caused by temperature dependence of the transport reaction equilibrium. The small polyhedrons obtained on molybdenum are builrup by macroscopic smooth {IlO}-faces.