A self-driven fuel cell to recycle (NH4)2SO4 fertilizer and energy from desulfurization solution

A sulfite/air fuel cell for H2O2 electrosynthesis

“…5(b). 21 The discharge current density achieved 24.48 mA cm −2 of 2.0 mol L −1 sulfite concentration. EIS results depicted in Fig.…”

“…The significant amount of the SO 4 2− ion and impurities in the wastewater may be the important factor influencing cell performance. 21 Compared to the pure reagent solution, the cell impedance of the fuel cell adopting the wastewater was higher (Fig. 7(c)).…”

“…COMSOL Multiphysics® version 5.5 software was applied to build the fuel cell model. 13,21 The performance of the fuel cell, e.g. open cell voltage (OCV), discharge current, and electrochemical impedance spectroscopy (EIS), was measured.…”

“…High H + concentration in the catholyte may restrict the proton across the membrane. 21 To obviate a harsh running environment, the H 2 SO 4 concentration of the catholyte was selected at 0.3 mol L −1 here.…”

Sulfide/Air Fuel Cell for Sulfur Recycling from Sulfide-Containing Wastewater

“…The decrease in electrical impedance from raw solution to a pH of 11 may be ascribed to the enhanced proton transportation across PEM. 14 Figure 7 presents the cell performances using the spent caustic stream as fuel. The sulfide concentration and pH of the sulfide-containing wastewater were 1.82 mol L −1 and 12.59, respectively.…”