Regulating a Zn/Co bimetallic catalyst in a metal–organic framework and oxyhydroxide for improved photoelectrochemical water oxidation

Xing, Xiu‐Shuang; Zeng, Xuyang; Zhou, Zhóngyuan; Song, Xin; Jing, Xiping; Yuan, Minghao; Xu, Chen; Ren, Xiaofei; Du, Jimin

doi:10.1039/d3dt01198d

Cited by 11 publications

(2 citation statements)

References 49 publications

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“…The Co 2+ ion in the PMS system activation has proven to be best because it delivers an excellent degradation performance, which is significantly higher than the classical method of degradation. 14,15 However, dissolved homogeneous Co 2+ has an adverse pathogenic effect because it can osmose into the environment as a secondary pollutant. Therefore, in order to conquer the shortcomings of Co 2+ homogeneous systems, several cobaltic oxides, e.g., CoO, Co 3 O 4 , Co 2 O 3 , CoOOH, etc., and cobalt-containing binary oxides, e.g., Co 2 MnO 4 , CoFe 2 O 4 , FeCo 2 O 4 , and Co 2 TiO 2 , have been widely synthesized as heterogeneous catalysts for the activation of PMS.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Co and Fe are the most efficient choices among all of these transition-metal catalysts. The Co 2+ ion in the PMS system activation has proven to be best because it delivers an excellent degradation performance, which is significantly higher than the classical method of degradation. , However, dissolved homogeneous Co 2+ has an adverse pathogenic effect because it can osmose into the environment as a secondary pollutant. Therefore, in order to conquer the shortcomings of Co 2+ homogeneous systems, several cobaltic oxides, e.g., CoO, Co 3 O 4 , Co 2 O 3 , CoOOH, etc., and cobalt-containing binary oxides, e.g., Co 2 MnO 4 , CoFe 2 O 4 , FeCo 2 O 4 , and Co 2 TiO 2 , have been widely synthesized as heterogeneous catalysts for the activation of PMS. − , Due to their significant advantages like the ease of separation, recyclability of the solid nanocatalyst, comparatively less pollution, and cost-effectiveness, they can be considered as excellent alternatives to the homogeneous Co 2+ system .…”

Section: Introductionmentioning

confidence: 99%

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Facilitated Visible-Light-Driven Peroxymonosulfate Activation by a Co–Fe Layered Double Hydroxide Derived p–n Heterostructure for Sulfadiazine Degradation: Affecting Parameters, Kinetics, and Mechanistic Insights

Mohanty,

Sahoo,

Das

et al. 2024

Inorg. Chem.

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The utilization of multivalence ionic metal species generated through a peroxymonosulfate (PMS)-assisted photocatalytic system is a promising platform for the selective degradation of water contaminants. However, achieving an effective electron transport and enhanced separation efficiency for these metal species is a daunting challenge. Thus, our current study addresses this challenge by using a Co−Fe-based layered-double-hydroxide template to synthesize a Co 3 O 4 /FeCo 2 O 4 p−n heterojunction composite via a simple monosynthetic route. The resultant composite is thoroughly validated through advanced characterization techniques that efficiently activate PMS for sulfadiazine (SDZ) degradation under visible light, achieving a remarkable degradation efficiency of up to 90%. This accomplishment is attributed to factors including intimate interfacial contact, excellent light harvesting, mesoporosity, and oxygen vacancies within the composite. The formation of a distinct p−n heterojunction following the S-scheme charge dynamic significantly enhances photogenerated carrier separation and reduces charge recombination. The research delves into comprehensive investigations including degradation studies, active species trapping experiments, parameter exploration, and in-depth liquid chromatography−mass spectrometry for analysis of the degradation byproducts and pathway. Induced oxygen vacancies, strategically placed active surface sites, and mesoporosity in the Co 3 O 4 /FeCo 2 O 4 composite synergistically boosted the sluggish PMS activation, leading to enhanced SDZ degradation. This study introduces a new perspective by demonstrating the potential of a single-material, mixed-metal oxide-based p−n heterojunction photocatalytic system following the S-scheme charge-transfer route for SDZ degradation. The findings contribute toward emphasizing the importance of tailored composite materials in tackling persistent contaminants.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facilitated Visible-Light-Driven Peroxymonosulfate Activation by a Co–Fe Layered Double Hydroxide Derived p–n Heterostructure for Sulfadiazine Degradation: Affecting Parameters, Kinetics, and Mechanistic Insights

Mohanty,

Sahoo,

Das

et al. 2024

Inorg. Chem.

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Constructing Metal–Organic Framework Films with Adjustable Electronic Properties on Hematite Photoanode for Boosting Photogenerated Carrier Transport

Xing,

Zeng,

et al. 2024

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Hematite (α‐Fe2O3) has become a research hotspot in the field of photoelectrochemical water splitting (PEC‐WS), but the low photogenerated carrier separation efficiency limits further application. The electronic structure regulation, such as element doping and organic functional groups with different electrical properties, is applied to alleviate the problems of poor electrical conductivity, interface defects, and band mismatch. Herein, α‐Fe2O3 photoanodes are modified to regulate their electric structures and improve photogenerated carrier transport by the bimetallic metal–organic frameworks (MOFs), which are constructed with Fe/Ni and terephthalate (BDC) with 2‐substitution of different organic functional groups (─H, ─Br, ─NO2 and ─NH2). The α‐Fe2O3 photoanode loaded with FeNi‐NH2BDC MOF catalyst exhibits the optimal photocurrent density (2 mA cm−2) at 1.23 VRHE, which is 2.33 times that of the pure α‐Fe2O3 photoanode. The detailed PEC analyses demonstrate that the bimetallic synergistic effect between Fe and Ni can improve the conductivity and inhibit the photogenerated carrier recombination of α‐Fe2O3 photoanodes. The ─NH2 group as an electron‐donor group can effectively regulate the electron distribution and band structure of α‐Fe2O3 photoanodes to prolong the lifetime of photogenerated holes, which facilitates photogenerated carrier transport and further enhances the PEC‐WS performance of α‐Fe2O3 photoanode.

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Constructing iron-group doped metal–organic framework films on hematite photoanodes for efficient solar water splitting

Xing,

Zeng,

Zhou

et al. 2023

Adv Compos Hybrid Mater

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Regulating a Zn/Co bimetallic catalyst in a metal–organic framework and oxyhydroxide for improved photoelectrochemical water oxidation

Abstract: As one of the most popular photoanode materials, hematite (α-Fe2O3) has obvious advantages in the field of photoelectrochemical water splitting (PEC-WS). However, it is difficult to obtain excellent PEC-WS performance...

Cited by 11 publications

References 49 publications

Facilitated Visible-Light-Driven Peroxymonosulfate Activation by a Co–Fe Layered Double Hydroxide Derived p–n Heterostructure for Sulfadiazine Degradation: Affecting Parameters, Kinetics, and Mechanistic Insights

Facilitated Visible-Light-Driven Peroxymonosulfate Activation by a Co–Fe Layered Double Hydroxide Derived p–n Heterostructure for Sulfadiazine Degradation: Affecting Parameters, Kinetics, and Mechanistic Insights

Constructing Metal–Organic Framework Films with Adjustable Electronic Properties on Hematite Photoanode for Boosting Photogenerated Carrier Transport

Constructing iron-group doped metal–organic framework films on hematite photoanodes for efficient solar water splitting

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