Reactant-Transport Engineering Approach to High-Power Direct Borohydride Fuel Cells

Real-Time Monitoring of the Thermal Effect for the Redox Flow Battery by an Infrared Thermal Imaging Technology

“…In fluid mechanics, the Reynolds number (Re) is a specific value of inertial force to viscous force of a fluid. According to the literature [8,45], the enhancing Re reveals faster reactant transport, however, increasing Re was also found to induce a decrease in the peak power in the region of transition between the laminar and turbulent flow regimes. Moreover, the flow rate will be subjected to the flow channel fields.…”

“…To comfirm these comprehensive analyses of the thermal effect of the charge-discharge experimental parameters, the volumetric flow rate, flow velocity, Reynold's number effect, cell's performances, and thermal effect for the V/I RFB are summarized in Table 4. There are both the serpentine flow and parallel flow fields with channel width and channel depth differences, and were similar to the literature [45], and were applied in the V/I RFB. The results can be seen that the serpentine type with two-channels shows a larger Re value than that of the parallel-type with 25-channels.…”

Direct borohydride fuel cells: A selected review of their reaction mechanisms, electrocatalysts, and influence of operating parameters on their performance

“…The previous sections made clear that the core materials of (H2O2-) DBFCs drive their performance; their assembly, interface and structure also have a dramatic impact, in particular for the anode: (i) cracked (porous) layers (Figure 4A, B) (ii) graded layers based on Pd/C and Pt/C catalysts (Figure 4C) [48] all enabled to optimize the (very complex) mass-transport processes in DBFC anodes. from [53] with permission from CellPress. (E) Adapting the Pt nanoparticles density (catalyst loading) at the surface of carbon-fiber anodes enables to control the rate of H2 escape during the BOR in DBFC; reproduced from [54] with permission from Elsevier.…”

“…engineering the reactant-transport within the anode flow field architecture and fuel flowrates mitigates parasitic borohydride hydrolysis and hydrogen oxidation reactions, and minimizes anode masking by hydrogen bubbles [53] (Figure 4D).…”

A high performance direct borohydride fuel cell using bipolar interfaces and noble metal-free Ni-based anodes

“…The anolyte was made of 3 M KOH + 1.5 M NaBH4 and the catholyte of 15 wt% H2O2 in 1.5 M H2SO4 and both were flowed through the cell using peristaltic pumps with a flow rate of 5 mL.min -1 . The flowrate has also been previously optimized 44 The measurements were performed using a Solartron® potentiostat with a 4 A limitation. 0.1 V decreasing steps were applied and maintained for 2 min from the OCV value to 0.05 V or until the current limitation was reached.…”