In-situ desalination-coupled electrolysis with concurrent one-step-synthesis of value-added chemicals

Recent advances of bifunctional electrocatalysts and electrolyzers for overall seawater splitting

“…However, it is relatively difficult to use these electrolyzers directly for seawater electrolysis, so it is necessary to make corresponding improvements on their basis. Park and his group 91 proposed a different type electrolyser coupled with anion exchange membranes, cation exchange membranes (CEM) and bipolar membranes (BPMs), as shown in Fig. 11a.…”

“…Sandwiched cells between adjacent two desalination cells are denoted as concentration cells. Reprinted with permission 91. Copyright 2023, Elsevier.…”

Recent Advances in Hybrid Seawater Electrolysis for Hydrogen Production

“…In addition, Kim et al proposed a desalination-coupled hybrid seawater electrolyzer consisting of a BPM, an AEM, a CEM, and a second BPM that are sandwiched between a Ni/Fe-layered double hydroxide (NiFe-LDH) anode and a binary NiMo cathode (Figure 12a). [80] 1 m KOH and 1 m H 2 SO 4 were employed as the anolyte and the catholyte, respectively. When seawater is injected into the middle desalination unit, Na + and Cl − migrate toward the base cell on the right side and the acid cell on the left side, respectively, driven by the external voltage applied.…”

“…In this way, the whole system cannot only realize H 2 production, but also generate value-added chemicals, such as NaOH and HCl, from seawater. However, the voltage required to drive such a system is high, amounting to 2.4 V [80] Copyright 2023, Elsevier. d) The Pourrbaix diagram of the HzOR, HER, and OER in the range of pH 0-14. e) The relationship between the H 2 yield rate of the ENC and H+/OH− concentrations in the electrolyte as well as the temperature.…”

“…c) Time-dependent O 2 and H 2 production from the anolyte and catholyte, respectively, and their Faradaic efficiency values at 10 mA cm −2 in desalinationcoupled electrocatalytic device. Reproduced with permission [80]. Copyright 2023, Elsevier.…”