Coupling post-modification with reconstruction over Co-based metal–organic frameworks for electrochemical collective value-added recycling of nitrate and sulfion in wastewater

Ren, Tianlun; Wang, Huizhen; Xu, Shan; Yu, Hongjie; Deng, Kai; Wang, Ziqiang; Wang, Hongjing; Wang, Liang; Xu, You

doi:10.1039/d3ta04629j

J. Mater. Chem. A

2023

DOI: 10.1039/d3ta04629j

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Coupling post-modification with reconstruction over Co-based metal–organic frameworks for electrochemical collective value-added recycling of nitrate and sulfion in wastewater

Tianlun Ren,

Huizhen Wang,

Shan Xu

et al.

Abstract: Integrating electrochemical nitrate reduction to ammonia (NRA) and sulfion oxidation reaction (SOR) to construct a coupled electrolysis system is expected to realize the collective value-added recycling of nitrate and sulfion...

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2024

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Cited by 7 publications

References 66 publications

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Advances in Electrocatalyst Design and Mechanism for Sulfide Oxidation Reaction in Hydrogen Sulfide Splitting

Yu,

Deng,

et al. 2024

Adv Funct Materials

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Sulfide oxidation reaction (SOR) is a semi‐reaction for the electrochemical decomposition of hydrogen sulfide. Combining SOR with the hydrogen evolution reaction (HER) allows for the simultaneous splitting of hydrogen sulfide (H2S) to produce green hydrogen, reducing energy input and environmental pollution. However, the phenomenon of sulfur passivation on the anode leads to catalyst deactivation, posing a bottleneck in developing efficient SOR. Electrocatalysts with decent performance and sulfur‐tolerance play a central role in the application of SOR. Here, recent progress on electrocatalysis mechanisms and catalyst design strategies of SOR are summarized. A summary of recent progress is made in materials such as alloys, metal oxides, metal sulfides, metal selenides, and heterostructures as SOR catalysts. Additionally, some valuable design and modulation strategies are highlighted and included. Finally, this review offers an outlook on the future directions in this emerging field.

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Advances in Electrocatalyst Design and Mechanism for Sulfide Oxidation Reaction in Hydrogen Sulfide Splitting

Yu,

Deng,

et al. 2024

Adv Funct Materials

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Recent Progress in Cobalt‐Based Electrocatalysts for Efficient Electrochemical Nitrate Reduction Reaction

Meng,

Tan,

et al. 2024

Adv Funct Materials

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Electrochemical nitrate reduction reaction (NO3−RR) provides a sustainable and efficient way to producing ammonia at ambient condition and denitrifying wastewater. However, NO3−RR is still confronted with some barriers at present, because of the sluggish reaction kinetics and competitive hydrogen evolution reaction (HER). Particularly, it requires highly robust and selective electrocatalysts, which steers the complex multistep reactions toward NO3−RR process. Among the various electrocatalysts, Co‐based electrocatalysts demonstrate a rapid reaction kinetics, steady catalytic performance, and suppressive impact on HER for NO3−RR, attracting more attention. In this review, it is focused on Cobalt‐based electrocatalysts design for NO3−RR and the corresponding design strategies are summarized. In detail, these can be concisely classified into five categories, including the Co‐based oxides and hydroxides, alloys, metal, and heteroatom‐doped materials, metal organic frameworks and derivatives. Each category is extensively discussed, with its design concepts and ideas clearly conveyed through appropriate illustrations and figures. Finally, the scientific and technological challenges as well as promising constructing strategies for NO3−RR system in the future are discussed. It is expected that this review can provide valuable insights and guidance into rational design of Co‐based electrocatalysts for NO3−RR, ultimately advancing their applications to industrial scenario with high current density, stability, and energy efficiency.

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Bifunctional PtCu Nanooctahedrons for the Electrochemical Conversion of Nitrite and Sulfion Into Value‐Added Products

Hong,

Zhong,

et al. 2024

Advanced Sustainable Systems

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The electrochemical reduction of nitrite (NO2−) contaminants to ammonia (NH3) is a sustainable and energy‐saving strategy for NH3 synthesis. However, this multi‐electron reduction process requires an efficient electrocatalyst to overcome the kinetic barrier. Herein, the Pt2Cu1 nanooctahedrons are synthesized through a liquid‐phase chemical reduction process. The synergistic effect of bimetallic Pt and Cu sites in the Pt2Cu1 nanooctahedrons is indispensable for accelerated NO2− hydrogenation, originating from the strong hydrogen‐atoms adsorption capacity at Pt site and the strong NO2− adsorption capacity at Cu site. Specifically, the introduction of Pt sites can accelerate the accumulation of hydrogenated species on the catalyst surface, which promotes the formation of NH3. In 0.5 m Na2SO4 solution, the Pt2Cu1 nanooctahedrons can reduce NO2− to NH3 at a yield of 4.22 mg h−1mgcat−1 and a Faraday efficiency of 95.5% at a potential of −0.14 V versus RHE. Meanwhile, the Pt2Cu1 nanooctahedrons also exhibit excellent activity for the sulfion oxidation reaction (SEOR). Using Pt2Cu1 nanooctahedrons as bifunctional electrocatalyst, a coupled electrolysis system combining the nitrite electrochemical reduction reaction (NO2−ERR) with the SEOR requires only 0.3 V total voltage, enabling energy‐saving electrochemical NH3 production and collective value‐added recovery of nitrite and sulfion waste.

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Coupling post-modification with reconstruction over Co-based metal–organic frameworks for electrochemical collective value-added recycling of nitrate and sulfion in wastewater

Abstract: Integrating electrochemical nitrate reduction to ammonia (NRA) and sulfion oxidation reaction (SOR) to construct a coupled electrolysis system is expected to realize the collective value-added recycling of nitrate and sulfion...

Cited by 7 publications

References 66 publications

Advances in Electrocatalyst Design and Mechanism for Sulfide Oxidation Reaction in Hydrogen Sulfide Splitting

Advances in Electrocatalyst Design and Mechanism for Sulfide Oxidation Reaction in Hydrogen Sulfide Splitting

Recent Progress in Cobalt‐Based Electrocatalysts for Efficient Electrochemical Nitrate Reduction Reaction

Bifunctional PtCu Nanooctahedrons for the Electrochemical Conversion of Nitrite and Sulfion Into Value‐Added Products

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