Effect of electrolyte flow on a gas evolution electrode

Abstract

In this study, the effect of flow of the electrolyte on an electrolysis cell and a zinc cell is investigated. The gain of energy brought by the flow is discussed and compared to the viscous losses in the cells. We point out that the balance between the gained electrical power and the viscous loss power is positive only if the hydrodynamic resistance of the circuit is correctly designed and further comment on the economical viability of the whole process. A model of the studied phenomena is proposed in the last section. This analytical model captures the dynamics of the process, gives the optimal flowing conditions and the limits of the energetical rentability of the process. This study shows that the use of flowing electrolyte in zinc–air batteries can be energetically profitable with the appropriate flowing conditions.

Numerical computation of electrical potential on a gas evolving electrode.

“…In the low current density situation, the distribution of bubbles is wide, centered on a well defined radius. In the high current density situation, a second peak appears in the bubble size distribution, which is much smaller in size than the previous ones [20], [9]. This peak is interpreted by considering that the action of the current on the metal surface creates modifications of the oxide layers which can allow the appearance of other types of nucleation sites.…”

“…When the radius of the bubble reaches the Fritz's radius R F ritz (i), the bubble detaches. The Fritz radius distribution follows a Gaussian distribution as described experimentally in litterature [9]. Oxygen volumes and bubble radii are reset to 0 for active sites that have validated the bubble detachment test (when R(i, t) > R F ritz (i)).…”

“…Each element is then associated with a Fritz radius R F ritz (i). The experimentally observed distribution of the bubbles ( [20], [9]) is introduced inside the simulation by the separation of active sites into three types. In this work, we decide to work with three population of bubbles.…”

“…The first type corresponds to active sites giving large bubbles (population A), the other sites produce bubbles of smaller size (population B) and the latest produce bubbles of the smallest size (population C). These considerations are based on experimental data [20], [9]. In the low current density situation, the distribution of bubbles is wide, centered on a well defined radius.…”

Akurasi dan Presisi Metode Sekunder Pengukuran Konduktivitas Menggunakan Sel Jones Tipe E untuk Pemantauan Kualitas Air Minum

“…(5) Penentuan Ksel diawali dengan memasukkan larutan standar primer CRM1811 ke dalam Sel Jones tipe E dan dipastikan tidak terdapat gelembung yang menempel pada elektroda di dalam sel, karena hal ini dapat mengurangi luas permukaan efektif elektroda, meningkatkan nilai resistansi, dan menurunkan nilai konduktivitas sampel [35]. Sel Jones tipe E yang sudah diisi kemudian dimasukkan ke dalam penangas air untuk menjaga suhu pengukuran stabil pada 25°C.…”