Seawater electrocatalysis: activity and selectivity

Khatun, S.; Hirani, Harish; Roy, Poulomi

doi:10.1039/d0ta08709b

Cited by 160 publications

(109 citation statements)

References 89 publications

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“…Meanwhile, the generated holes drift toward the Pt counter electrode through the external circuit and participate in the reaction: 4OH – + 4h + = O 2 + 2H 2 O. [ 24 ] Finally, the photocurrent can be collected by the electrochemical workstation while the OH − transports through the electrolyte to complete the current circuit. In this process, the Cl – and Na + could help to enhance the conductivity.…”

Section: Resultsmentioning

confidence: 99%

Demonstration of Photoelectrochemical‐Type Photodetectors Using Seawater as Electrolyte for Portable and Wireless Optical Communication

Luo

Wang

Kang

et al. 2022

Advanced Optical Materials

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The emerging photoelectrochemical‐type photodetector (PEC‐PD), because of its unique device architecture by using an aqueous electrolyte, is naturally applicable in the pursuit of underwater optical communication without sophisticated device packaging and assembling. Unfortunately, the traditional PEC detecting process typically involves a large electrochemical workstation with long cables and wire connections for photo signal acquisition, which hinders its applications in wireless optical communication. In this work, an AlGaN nanowire‐based self‐powered PEC‐PD is fabricated that uses seawater as an electrolyte, and then an optical communication system including the PEC‐PD and a portable electrochemical workstation as the signal receiver for data communication is built. Essentially, the self‐power PEC‐PD shows a high responsivity of −15.5 mA W–1, a fast response/recovery time of ≈100 ms, and high stability operation in the seawater electrolyte. Foremost, the optical communication system shows high accuracy in wireless transmission of ASCII code signals in a seawater environment. Such a demonstration offers a new device architecture for possible under‐seawater communication systems by leveraging the unique operation principle of photoelectrochemical devices in the future.

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Section: Resultsmentioning

confidence: 99%

Demonstration of Photoelectrochemical‐Type Photodetectors Using Seawater as Electrolyte for Portable and Wireless Optical Communication

Luo

Wang

Kang

et al. 2022

Advanced Optical Materials

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“…Both reactions need highly efficient electrocatalysts to overcome energy consumption overpotentials. After a wide variety of research efforts and tremendous advancements, researchers have successfully developed many excellent electrocatalysts for OERs and HERs, which can significantly promote the application of water splitting [13][14][15][16][17][18][19][20]. However, electrocatalysts that are both stable and highly active are still insufficient to the task, so direct electrolysis of seawater to generate H 2 remains challenging.…”

Section: Introductionmentioning

confidence: 99%

High Selectivity Electrocatalysts for Oxygen Evolution Reaction and Anti-Chlorine Corrosion Strategies in Seawater Splitting

et al. 2022

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Seawater is one of the most abundant and clean hydrogen atom resources on our planet, so hydrogen production from seawater splitting has notable advantages. Direct electrolysis of seawater would not be in competition with growing demands for pure water. Using green electricity generated from renewable sources (e.g., solar, tidal, and wind energies), the direct electrolytic splitting of seawater into hydrogen and oxygen is a potentially attractive technology under the framework of carbon-neutral energy production. High selectivity and efficiency, as well as stable electrocatalysts, are prerequisites to facilitate the practical applications of seawater splitting. Even though the oxygen evolution reaction (OER) is thermodynamically favorable, the most desirable reaction process, the four-electron reaction, exhibits a high energy barrier. Furthermore, due to the presence of a high concentration of chloride ions (Cl−) in seawater, chlorine evolution reactions involving two electrons are more competitive. Therefore, intensive research efforts have been devoted to optimizing the design and construction of highly efficient and anticorrosive OER electrocatalysts. Based on this, in this review, we summarize the progress of recent research in advanced electrocatalysts for seawater splitting, with an emphasis on their remarkable OER selectivity and distinguished anti-chlorine corrosion performance, including the recent progress in seawater OER electrocatalysts with their corresponding optimized strategies. The future perspectives for the development of seawater-splitting electrocatalysts are also demonstrated.

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“…The progress for the H 2 economy indicates that steam methane reforming and coal gasification are two main technologies to produce H 2 industrially, which involves the consumption of fossil fuels and contradicts the green belief of the H 2 economy with no greenhouse gas and pollutant emission strategy [7–9] . In comparison, water electrolysis, as a sustainable H 2 production method by combing renewable electric energy and abundant water resources, has attracted increasing interest from both academic and industrial communities in recent years [10–14] . Water electrolysis consists of anodic OER and cathodic HER [15] .…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9] In comparison, water electrolysis, as a sustainable H 2 production method by combing renewable electric energy and abundant water resources, has attracted increasing interest from both academic and industrial communities in recent years. [10][11][12][13][14] Water electrolysis consists of anodic OER and cathodic HER. [15] As a thermodynamically unfavorable reaction, the theoretical operation voltage for water electrolysis is 1.23 V, but a much higher voltage (1.8 ~2.0 V) is needed due to the sluggish kinetics for both oxygen and hydrogen evolution reactions.…”

Section: Introductionmentioning

confidence: 99%

Metal–Organic Frameworks‐Derived Self‐Supported Carbon‐Based Composites for Electrocatalytic Water Splitting

Cong

Huang

Yan

et al. 2021

Chemistry A European J

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Electrocatalytic water splitting has been considered as a promising strategy for the sustainable evolution of hydrogen energy and storage of intermittent electric energy. Efficient catalysts for electrocatalytic water splitting are urgently demanded to decrease the overpotentials and promote the sluggish reaction kinetics. Carbon-based composites, including heteroatom-doped carbon materials, metals/ alloys@carbon composites, metal compounds@carbon composites, and atomically dispersed metal sites@carbon composites have been widely used as the catalysts due to their fascinating properties. However, these electrocatalysts are almost powdery form, and should be cast on the current collector by using the polymeric binder, which would result in the unsatisfied electrocatalytic performance. In comparison, a self-supported electrode architecture is highly attractive. Recently, self-supported metal-organic frameworks (MOFs) constructed by coordination of metal centers and organic ligands have been considered as suitable templates/precur-sors to construct free-standing carbon-based composites grown on conductive substrate. MOFs-derived carbon-based composites have various merits, such as the well-aligned array architecture and evenly distributed active sites, and easy functionalization with other species, which make them suitable alternatives to non-noble metal-included electrocatalysts. In this review, we intend to show the research progresses by employment of MOFs as precursors to prepare self-supported carbon-based composites. Focusing on these MOFs-derived carbon-based nanomaterials, the latest advances in their controllable synthesis, composition regulation, electrocatalytic performances in hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and overall water splitting (OWS) are presented. Finally, the challenges and perspectives are showed for the further developments of MOFs-derived self-supported carbon-based nanomaterials in electrocatalytic reactions.

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Seawater electrocatalysis: activity and selectivity

Abstract: Seawater is considered to be major hydrogen reservoir. However, the presence of multielements in seawater and their interference in electrochemistry, especially the chlorine chemistry, makes the electrocatalytic water splitting of...

Cited by 160 publications

References 89 publications

Demonstration of Photoelectrochemical‐Type Photodetectors Using Seawater as Electrolyte for Portable and Wireless Optical Communication

Demonstration of Photoelectrochemical‐Type Photodetectors Using Seawater as Electrolyte for Portable and Wireless Optical Communication

High Selectivity Electrocatalysts for Oxygen Evolution Reaction and Anti-Chlorine Corrosion Strategies in Seawater Splitting

Metal–Organic Frameworks‐Derived Self‐Supported Carbon‐Based Composites for Electrocatalytic Water Splitting

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