Effective anodic sulfide removal catalyzed by single nickel atoms on nitrogen-doped graphene with stainless steel substrate

Zhang, Xin; Qi, Riying; Wu, Anxin; Sheng, Kuichuan; Lin, Hongjian

doi:10.1016/j.cej.2021.130963

Cited by 20 publications

(2 citation statements)

References 56 publications

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“…The sulfide oxidation reaction (SOR) is a critical process for electrochemical desulfurization, H 2 S recovery, and Li–S batteries. − However, due to the strong corrosivity of sulfion, the lack of efficient electrocatalysts with corrosion resistance and passivation properties has seriously hindered the development of SOR-based technology. , Transition metal sulfide (TMS)-based materials typically have high electrical conductivities compared to metal oxides because of their narrower bandgaps. − Furthermore, transition metal sulfides have a low affinity for S, which can effectively avoid electrode passivation during the reaction process and achieve high stability . In addition, due to the complex existence form of sulfur in different electrolytes, the existence form of sulfur oxidation products is not clear, and the sulfur products obtained from SOR are complex.…”

Section: Introductionmentioning

confidence: 99%

Improving the Sulfurophobicity of the NiS-Doping CoS Electrocatalyst Boosts the Low-Energy-Consumption Sulfide Oxidation Reaction Process

Huo,

Jin,

Chen

et al. 2023

ACS Appl. Mater. Interfaces

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Producing sulfur from a sulfide oxidation reaction (SOR)-based technique using sulfide aqueous solution has attracted considerable attention due to its ecofriendliness. This study demonstrates that NiS-doped cobalt sulfide NiS-CoS-supported NiCo alloy foam can deliver the SOR with superior electrocatalytic activity and robust stability compared to reported non-noble metal-based catalysts. Only 0.34 V vs RHE is required to drive a current density of 100 mA cm–2 for the SOR. According to the experiment, the catalyst exhibits a unique sulfurophobicity feature because of the weak interaction between sulfur and the transition metal sulfide (low affinity for elemental sulfur), preventing electrode corrosion during the SOR process. More impressively, the chain-growth mechanism of the SOR from short- to long-chain polysulfides was revealed by combining electrochemical and spectroscopic in situ methods, such as in situ ultraviolet–visible and Raman. It is also demonstrated that electrons can transfer straight from the sulfion (S2–) to the active site on the anode surface during the low-energy-consumption SOR process. This work provides new insight into simultaneous energy-saving hydrogen production and high-value-added S recovery from sulfide-containing wastewater.

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Section: Introductionmentioning

confidence: 99%

Improving the Sulfurophobicity of the NiS-Doping CoS Electrocatalyst Boosts the Low-Energy-Consumption Sulfide Oxidation Reaction Process

Huo,

Jin,

Chen

et al. 2023

ACS Appl. Mater. Interfaces

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“…In addition to the above-mentioned sulfur-containing organics, inorganic sulfides like sulfion (S 2– ), hydrogen sulfide (H 2 S, HS – ), sulfite (SO 3 2– ) and so on are usually toxic, corrosive, or smelly in sewage from tannery, paper mill, and petrochemical plants. ,− Efficient desulfurization via sulfides electro-oxidation reaction (SOR) is crucial to environment protection and human health. In view of the more favorable thermodynamics of SOR like sulfion (S 2– → S + 2e – , –0.48 V vs RHE) than OER, it is attractive to couple SOR with HER for energy-saving hydrogen production, and simultaneous conversion of harmful sulfion to valuable sulfur powder.…”

Section: Bifunctional Electrocatalysts For Hybrid Water Splittingmentioning

confidence: 99%

Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Quan,

Jiang,

Mei

et al. 2024

Chem. Rev.

128

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Electrocatalytic water splitting driven by renewable electricity has been recognized as a promising approach for green hydrogen production. Different from conventional strategies in developing electrocatalysts for the two half-reactions of water splitting (e.g., the hydrogen and oxygen evolution reactions, HER and OER) separately, there has been a growing interest in designing and developing bifunctional electrocatalysts, which are able to catalyze both the HER and OER. In addition, considering the high overpotentials required for OER while limited value of the produced oxygen, there is another rapidly growing interest in exploring alternative oxidation reactions to replace OER for hybrid water splitting toward energy-efficient hydrogen generation. This Review begins with an introduction on the fundamental aspects of water splitting, followed by a thorough discussion on various physicochemical characterization techniques that are frequently employed in probing the active sites, with an emphasis on the reconstruction of bifunctional electrocatalysts during redox electrolysis. The design, synthesis, and performance of diverse bifunctional electrocatalysts based on noble metals, nonprecious metals, and metal-free nanocarbons, for overall water splitting in acidic and alkaline electrolytes, are thoroughly summarized and compared. Next, their application toward hybrid water splitting is also presented, wherein the alternative anodic reactions include sacrificing agents oxidation, pollutants oxidative degradation, and organics oxidative upgrading. Finally, a concise statement on the current challenges and future opportunities of bifunctional electrocatalysts for both overall and hybrid water splitting is presented in the hope of guiding future endeavors in the quest for energy-efficient and sustainable green hydrogen production.

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Bifunctional Co₃S₄ Nanowires for Robust Sulfion Oxidation and Hydrogen Generation with Low Power Consumption

Xiao

Wang

et al. 2022

Adv Funct Materials

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Sulfion oxidation reaction holds great potential for replacing kinetically sluggish water oxidation to save power consumption and simultaneously purifying environmental sulfion-rich sewage. However, it is still challenged by the insufficient mechanism understanding and questionable stability caused by sulfur passivation. Here, it is demonstrated that bifunctional Co 3 S 4 nanowires for assembling hybrid seawater electrolyzer that combines anodic sulfion oxidation and cathodic seawater reduction with an ultra-low power consumption of 1.185 kWh m −3 H 2 under 100 mA cm −2 , saving energy consumption over 70% compared to the traditional water splitting system. Unlike water is oxidized into O 2 at high potentials under alkaline water splitting system, experiments combined with in situ characterizations uncover the stepwise oxidation of S 2− to short-chain polysulfides and then to value-added product of S 8 . Density functional theory calculations prove that Co 3 S 4 possesses reduced energy barriers in the rate-determining S 3 2− to S 4 − oxidation step and S 8 desorption step, promoting conversion of short-chain polysulfides and efficient desorption of S 8 . These findings reveal the catalytic mechanism of sulfion oxidation and inspire an economic approach toward the fabrication of bifunctional Co 3 S 4 for achieving energy-saving hydrogen production from seawater while rapidly disposing sulfion-rich sewage with boosted activity and stability.

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Effective anodic sulfide removal catalyzed by single nickel atoms on nitrogen-doped graphene with stainless steel substrate

Cited by 20 publications

References 56 publications

Improving the Sulfurophobicity of the NiS-Doping CoS Electrocatalyst Boosts the Low-Energy-Consumption Sulfide Oxidation Reaction Process

Improving the Sulfurophobicity of the NiS-Doping CoS Electrocatalyst Boosts the Low-Energy-Consumption Sulfide Oxidation Reaction Process

Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Bifunctional Co₃S₄ Nanowires for Robust Sulfion Oxidation and Hydrogen Generation with Low Power Consumption

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Effective anodic sulfide removal catalyzed by single nickel atoms on nitrogen-doped graphene with stainless steel substrate

Cited by 20 publications

References 56 publications

Improving the Sulfurophobicity of the NiS-Doping CoS Electrocatalyst Boosts the Low-Energy-Consumption Sulfide Oxidation Reaction Process

Improving the Sulfurophobicity of the NiS-Doping CoS Electrocatalyst Boosts the Low-Energy-Consumption Sulfide Oxidation Reaction Process

Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Bifunctional Co3S4 Nanowires for Robust Sulfion Oxidation and Hydrogen Generation with Low Power Consumption

Contact Info

Product

Resources

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Bifunctional Co₃S₄ Nanowires for Robust Sulfion Oxidation and Hydrogen Generation with Low Power Consumption