A current-driven six-channel potentiostat for rapid performance characterization of microbial electrolysis cells

Knowledge of the performance of microbial electrolysis cells under a wide range of operating conditions is crucial to achieve high production efficiencies. Characterizing this performance in an experiment, however, is challenging due to either the long measurement times of steady-state procedures or the transient errors of dynamic procedures. Moreover, wide parallelization of the measurements is not feasible due to the high measurement equipment cost per channel. Hence, to speedup this characterization and to facilitate low-cost, yet widely parallel measurements, this paper presents a novel rapid polarization curve measurement procedure with a dynamic measurement resolution that runs on a custom six-channel potentiostat with a current-driven topology. As case study, the procedure is used to rapidly assess the impact of altering pH values on a microbial electrolysis cell that produces H-2. A $\times 2$ - $\times 12$ speedup could be obtained in comparison with the state-of-the-art, depending on the characterization resolution (16-128 levels). On top of this speedup, measurements can be parallelized up to $6\times$ on the presented, affordable-42-per-channel-potentiostat

Partying and cocooning? no paradox for mayoral recruitment in Belgium

This paper studies the role of partisanship in the road to the Belgian mayoralty. It confirms the expectation that most mayors have quite extensive party records prior to coming to office. Although different degrees of partisanship are thus relative, they tend to sort both internal and external effects. Mayors with a highly partisan background give a more active interpretation of their initial recruitment and get a head start in their political career. They also more frequently come from families that are deeply engaged in politics. In addition, they combine their own partisan experience with additional recruitment apprenticeships. Having held a function in a party and having experienced extensive party support make mayoral orientations more partisan in terms of task importance and exchange of views with party leaders

Doorstart of doodlopende straat voor de provincies? Een comparatieve analyse van de steun voor functionele en territoriale hervormingen in veertien Europese landen

Deze bijdrage neemt de functionele en territoriale hervormingen in Europa onder de loep. Daarbij gaat de aandacht niet alleen naar het feitelijke hervormingsproces en –discours in verschillende landen, maar ook naar de steun voor de hervormingspistes onder de provincieraadsleden. De steun of het gebrek daaraan bepaalt immers mee de toekomst van het provinciaal bestuursniveau. Maken de provincies effectief kans op een doorstart of bevinden ze zich in een doodlopende straat? We bekijken dit debat specifiek door de ogen van provincieraadsleden aangezien die de democratische hoeksteen vormen van het intermediair bestuursniveau. Welke functionele en territoriale hervormingen krijgen hun steun

A 64-channel, 1.1-pA-accurate on-chip potentiostat for parallel electrochemical monitoring

Electrochemical monitoring is crucial for both industrial applications, such as microbial electrolysis and corrosion monitoring as well as consumer applications such as personal health monitoring. Yet, state-of-the-art integrated potentiostat monitoring devices have few parallel channels with limited flexibility due to their channel architecture. This work presents a novel, widely scalable channel architecture using a switch capacitor based Howland current pump and a digital potential controller. An integrated, 64-channel CMOS potentiostat array has been fabricated. Each individual channel has a dynamic current range of 120dB with 1.1pA precision with up to 100kHz bandwidth. The on-chip working electrodes are post-processed with gold to ensure (bio)electrochemical compatibility