Exploring the effect of ion concentrations on the electrode activity and stability for direct alkaline seawater electrolysis

He, Tengteng; Liu, Qianfeng; Fan, Hefei; Yang, Yang; Wang, Hongtao; Zhang, Shengzhong; Che, Ruxin; Wang, Erdong

doi:10.1016/j.ijhydene.2023.01.321

Cited by 8 publications

(6 citation statements)

References 72 publications

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“…Increasing OH À concentration from 1 M to 3 M can slightly reduce the overpotential (~%6). [116] Thus, the normalized overpotential of this catalyst in 1 M KOH is around 286 mV which is still excellent.…”

Section: Electrocatalyst Technologies For Oer In Seawatermentioning

confidence: 84%

“…[43] The ratedetermining step, either the Volmer-Tafel step or the Volmer-Heyrovsky step, can be identified from the Tafel slope, estimated from the polarization curve measured by linear sweep voltammetry (LSV). [45][46][47] Metal ions such as Ca + 2 and Mg + 2 can precipitate on the surface of the cathode due to local pH rise (e. g., Mg 2 + (aq) + 2OH À (aq) !Mg(OH) 2(s) ) at the surface of the catalyst. Mitigating strategies that can prevent the active sites of the HER catalyst from precipitation are required.…”

Section: Introductionmentioning

confidence: 99%

“…Conversely, the OER activity of the anode catalyst is enhanced by increasing the OH − concentration (see Table 1). [44] At high pHs the mechanism for HER follows two well‐known steps, Volmer‐Tafel and Volmer‐Heyrovsky (see Table 1). The water dissociation step is a prerequisite for the hydrogen evolution process to occur in an alkaline environment [43] .…”

Section: Introductionmentioning

confidence: 99%

“…The water dissociation step is a prerequisite for the hydrogen evolution process to occur in an alkaline environment [43] . The rate‐determining step, either the Volmer‐Tafel step or the Volmer‐Heyrovsky step, can be identified from the Tafel slope, estimated from the polarization curve measured by linear sweep voltammetry (LSV) [45–47] . Metal ions such as Ca +2 and Mg +2 can precipitate on the surface of the cathode due to local pH rise (e. g., Mg 2+ (aq) +2OH − (aq) →Mg(OH) 2(s) ) at the surface of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Catalysts for Direct Seawater Electrolysis: Current Status and Future Prospectives

Kasani,

Maric,

Bonville

et al. 2024

ChemElectroChem

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Global freshwater shortage is forcing researchers to focus on seawater electrolysis for large‐scale green hydrogen production. Seawater purification by reverse osmosis (RO) for use in conventional water electrolyzers (WEs) is another approach, however, that requires large capital investments. Alternatively, seawater can be used directly in a novel type of anion exchange membrane WE (AEMWE) which is currently under development. The AEMWEs have the advantage of using non‐precious catalysts and are less sensitive to the presence of impurities. Success in this early‐stage technology relies on the development of efficient and durable electrocatalysts. This paper provides a comprehensive review of the status and future trends for developing catalysts operating directly with seawater. Catalysts are ranked based on their activity and durability at high current densities of 500 mAcm−2 and 1000 mAcm−2. Notable anode catalysts, S−NiFe2O4, and NiFe LDH, exhibit reduced OER overpotentials of 287 mV and 296 mV at 1000 mAcm−2. Top‐performing cathode HER catalysts include HW−NiMoN‐2 h (132 mV) and Pt−Co−Mo (117 mV) at 1000 mAcm−2. Bifunctional catalysts, such as CoxPv@NC can operate below an overall voltage of 2 V at 1000 mAcm−2. This comparative analysis provides researchers and professionals with critical insights for advancing direct seawater electrolysis.

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Section: Electrocatalyst Technologies For Oer In Seawatermentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Catalysts for Direct Seawater Electrolysis: Current Status and Future Prospectives

Kasani,

Maric,

Bonville

et al. 2024

ChemElectroChem

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“…Consequently, alkaline seawater electrolysis has been investigated extensively in the past decade. [45][46][47][48][49][50][51][52][53][54][55][56] We evaluated 316 stainless-steel (SS) mesh and Ni foam electrodes for the OER in alkaline (0.1, 0.5, and 1 M NaOH/ KOH) seawater (simulated seawater, 0.5 M NaCl) electrolysis and observed that the overpotentials at 10 mA cm −2 for both electrodes decreased with the increase of alkali Industrial Chemistry & Materials Mini review concentration. 57 The lowest overpotential of 352 at 10 mA cm −2 was achieved with the SS mesh electrode, which was ∼150 mV less than that of the Ni foam electrode and comparable to those of commercial RuO 2 and IrO 2 catalysts.…”

Section: The Introduction Of Additives To Seawater Electrolytesmentioning

confidence: 99%

Cutting-edge methods for amplifying the oxygen evolution reaction during seawater electrolysis: a brief synopsis

Lyu,

Serov

2023

Ind. Chem. Mater.

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Probing passivity of corroding metals using scanning electrochemical probe microscopy

Skaanvik

Gateman

2023

Electrochemical Science Adv

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Passive films are essential for the longevity of metals and alloys in corrosive environments. A great deal of research has been devoted to understanding and characterizing passive films, including their chemical composition, thickness, uniformity, thickness, porosity, and conductivity. Many characterization techniques are conducted under vacuum, which do not portray the true in‐service environments passive films will endure. Scanning electrochemical probe microscopy (SEPM) techniques have emerged as necessary tools to complement research on characterizing passive films to enable the in situ extraction of passive film parameters and monitoring of local breakdown events of compromised films. Herein, we review the current research efforts using scanning electrochemical microscopy, scanning electrochemical cell microscopy (or droplet cell measurements), and local electrochemical impedance spectroscopy techniques to advance the knowledge of local properties of passivated metals. The future use of SEPM for quantitative extraction of local film characteristics within in‐service environments (i.e., with varying pH, solution composition, and applied potential) is promising, which can be correlated to nanostructural and microstructural features of the passive film and underlying metal using complementary microscopy and spectroscopy methods. The outlook on this topic is highlighted, including exciting avenues and challenges of these methods in characterizing advanced alloy systems and protective surface films.

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Exploring the effect of ion concentrations on the electrode activity and stability for direct alkaline seawater electrolysis

Cited by 8 publications

References 72 publications

Catalysts for Direct Seawater Electrolysis: Current Status and Future Prospectives

Catalysts for Direct Seawater Electrolysis: Current Status and Future Prospectives

Cutting-edge methods for amplifying the oxygen evolution reaction during seawater electrolysis: a brief synopsis

Probing passivity of corroding metals using scanning electrochemical probe microscopy

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