Seawater electrolyte-based metal–air batteries: from strategies to applications

Yu, Jingkun; Li, Bo‐Quan; Chang-xin, Zhao; Zhang, Qiang

doi:10.1039/d0ee01617a

Cited by 172 publications

(99 citation statements)

References 140 publications

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“…[ 5 ] The ratio of the oxygen defects to metal‐oxygen bonds in NCOS is obviously higher than that of NCO, suggesting a high content of oxygen defects. [ 32 ] The S 2p spectrum of NCOS and NCS (Figure 2g) is corresponding to the 2p 1/2 and 2p 3/2 peak, while the peak at 162.8 and 161.8 eV are attributed to the metal‐sulfur bonds. [ 33 ] Note that the metal‐sulfur bonds are believed to be favorable for the sodiation/desodiation process.…”

Section: Resultsmentioning

confidence: 99%

Insight into Nickel‐Cobalt Oxysulfide Nanowires as Advanced Anode for Sodium‐Ion Capacitors

Wang

Zhao

et al. 2021

Advanced Energy Materials

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Transition metal oxides have a great potential in sodium‐ion capacitors (SICs) due to their pronouncedly higher capacity and low cost. However, their poor conductivity and fragile structure hinder their development. Herein, core‐shell‐like nickel‐cobalt oxysulfide (NCOS) nanowires are synthesized and demonstrated as an advanced SICs anode. The bimetallic oxysulfide with multiple cation valence can promote the sodium ion adsorption and redox reaction, massive defects enable accommodation of the volume change in the sodiation/desodiation process, meanwhile the core‐shell‐like structure provides abundant channels for fast transfer of sodium ions, thereby synergistically making the NCOS electrode exhibit a high reversible sodium ion storage capacity (1468.5 mAh g−1 at 0.1 A g−1) and an excellent cyclability (90.5% capacity retention after 1000 cycles). The in‐situ X‐ray diffraction analysis unravels the insertion and conversion mechanism for sodium storage in NCOS, and the enhanced capability of NCOS is further verified by the kinetic analysis and theoretical calculations. Finally, SICs consisting of the NCOS anode and a boron‐nitrogen co‐doped carbon nanotubes cathode deliver an energy density of 205.7 Wh kg−1, a power density of 22.5 kW kg−1, and an outstanding cycling lifespan. These results indicate an efficient strategy in designing a high‐performance anode for sodium storage based on bimetallic dianion compounds.

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Section: Resultsmentioning

confidence: 99%

Insight into Nickel‐Cobalt Oxysulfide Nanowires as Advanced Anode for Sodium‐Ion Capacitors

Wang

Zhao

et al. 2021

Advanced Energy Materials

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“…OER is an important anodic half‐cell process in fuel cells, metal‐air batteries, water splitting applications. [ 84–86 ] It is a thermodynamic uphill reaction which involves multiple proton and electron transfer steps with multiple adsorption intermediates, which require more overpotentials for OER and lead to sluggish kinetics. Recently, many research teams are working to develop efficient, inexpensive, and stable catalysts for OER.…”

Section: Coordination Compounds In Electrocatalysismentioning

confidence: 99%

Advances in Understanding the Electrocatalytic Reconstruction Chemistry of Coordination Compounds

Liu

Guo

Huang

et al. 2021

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Coordination compounds including mainstream metal‐organic frameworks and Prussian blue analogues receive extensive researches when they directly serve as electrocatalysts. Their reconstruction phenomena, that are closely associated with actual contributions and intrinsic catalytic mechanisms, are expected to be well summarized. Here, the recent advances in understanding reconstruction chemistry of coordination compounds are reviewed, including their main classifications and structural properties, reconstruction phenomena in electrocatalysis (e.g., oxygen/hydrogen evolution reaction, CO2 reduction), influence factors of reconstruction parameters (e.g., reconstruction rate and reconstruction degree), and reconstruction‐performance correlation. It is outlined that the reconstruction processes are influenced by electronic structure of coordination compounds, pH and temperature of testing solution, and applied potentials. The characterization techniques reflecting the evolution information before and after catalysis are also introduced for reconstruction‐related mechanistic study. Finally, some challenges and outlooks on reconstruction investigations of coordination compounds are proposed, and the necessity of studying and understanding of these themes under actual working conditions of devices is highlighted.

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“…It is difficult to evaluate the influence of all the constituents on the catalytic reactions up to now 7,8 . Although a large number of Cl − can act as charge carriers to improve the conductivity of the electrolyte 9,10 , the resulting CER will compete with the OER [10][11][12] . Hence, materials with high selectivity for OER are desirable preferred at the anode in seawater electrolysis.…”

Section: Introductionmentioning

confidence: 99%

Challenges and Opportunities for Seawater Electrolysis: A Mini-Review on Advanced Materials in Chlorine-Involved Electrochemistry

Cui¹,

Shi²,

Li³

et al. 2021

Acta Physico Chimica Sinica

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Hydrogen (H2) is an important component in the framework of carbonneutral energy, and the scalable production of H2 from seawater electrolysis offers a feasible route to address global energy challenges. With abundant seawater reserves, seawater electrolysis, especially when powered by renewable electricity sources, has great prospects. However, chloride ions (Cl − ) in seawater can participate in the anodic reaction and accelerate the corrosion of electrode materials during electrolysis. Although the oxygen evolution reaction (OER) is thermodynamically favorable, the chlorine evolution reaction is highly competitive because fewer electrons are involved (2e − ). These two problems are compounded by the dearth of corrosion-resistant electrode materials, which hinders the practical applications of seawater electrolysis. Therefore, intensive research efforts have been devoted to optimizing electrode materials using fundamental theories for practical applications. This review summarizes the recent progress in advanced electrode materials with an emphasis on their selectivity and anti-corrosivity. Practical materials with improved selectivity for oxygen generation, such as mixed metal oxides, Ni/Fe/Co-based composites, and manganese oxide (MnOx)-coated heterostructures, are reviewed in detail. Theoretically, alkaline environments (pH > 7.5) are preferred for OER as a constant potential gap (480 mV) exists in the high pH region. Nevertheless, corrosion of both the cathode and anode from ubiquitous Clis inevitable. Only a few materials with good corrosion resistance are capable of sustained operation in seawater systems; these include metal titanium and carbon-based materials. The corrosion process is usually accompanied by the formation of a passivated layer on the surface, but the aggressive penetration of Clcan damage the whole electrode. Therefore, the selective inhibition of Cl − transport in the presence of a robust layer is critical to prevent continuous corrosion. Advances in anti-corrosion engineering, which encompasses inherently anti-corrosive materials, extrinsically protective coating, and in situ generated resistive species, are systematically discussed. Rational design can impart the material with good catalytic activity, stability, and corrosion resistance. Finally, we propose the following opportunities for future research: 1) screening of selective and anti-corrosive materials; 2) mechanism of competitive reactions and corrosion; 3) evaluation of anti-corrosive materials; 4) industrial-scale electrolysis with high current density; 5) optimization of experimental conditions; and 6) development of integrated electrolyzer devices. This review provides insights for the development of strategies aimed at tackling chlorine-related issues in seawater electrolysis.

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Seawater electrolyte-based metal–air batteries: from strategies to applications

Abstract: Aqueous metal–air batteries are promising next-generation energy storage and supply technologies due to advantages of high energy density and intrinsic safety. As an abundant natural resource, applying seawater-based electrolytes is...

Cited by 172 publications

References 140 publications

Insight into Nickel‐Cobalt Oxysulfide Nanowires as Advanced Anode for Sodium‐Ion Capacitors

Insight into Nickel‐Cobalt Oxysulfide Nanowires as Advanced Anode for Sodium‐Ion Capacitors

Advances in Understanding the Electrocatalytic Reconstruction Chemistry of Coordination Compounds

Challenges and Opportunities for Seawater Electrolysis: A Mini-Review on Advanced Materials in Chlorine-Involved Electrochemistry

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