Degradation material ageing mechanisms

Ex situ ADT methods, for example by using half-cells or rotating disk electrodes (RDEs), have also been developed to study materials aging mechanisms. " A typical example of an ex situ ADT is holding the electrode potential at high values (e.g. 1.4 V) in order to study carbon degradation. Based on the experimental data obtained under these conditions, it is currently concluded that state-of-the-art Pt, carbon and PEM materials will never reach durabihty requirements and that alternative materials are necessary for future CL materials. " " These conclusions merit reconsideration, as potentials higher than 1.2 V (the zero-... 

This is useful, albeit basic, information for an ES working in the domain of sick cars. If you are employed as a car mechanic, you are not likely to benefit from, or even be interested in, the presence within the knowledge base of details about how lead sulfate batteries degrade with age and how any diminution in concentration of the active materials in the battery can be related through the Nernst equation to a reduction in its voltage. In the context of car repair, all that you need to know is that the battery is dead and the car will not start, so it will need replacing or recharging. 

Materials ageing and degradation in light water reactors Mechanisms, and management... 

Continued, (b) Calculated impact of a square cycle operation (0.1-0.5 A.cm, period = 30 min) on the performance decay and deconvolution of the contribution of the different aging mechanisms, (c) Calculated cumulative materials mass losses in the air inlet side and in the air outlet side of the cathode and PEM, andTEM images comparing the cathode inlet vs outlet CL microstructure after the degradation experiment (7= 27 °C, = 1.5 bar, RH = RH = 100%, =... 

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