Cobalt–molybdenum–selenide nanoflowers for bifunctional visible light photocatalysis

Mohan, Harshavardhan; Ha, Ga Hyeon; Kim, Gitae; Lee, Hye Rin; Lee, Hak‐Ju; Kim, Kyoung-Soo; Shin, Taeho

doi:10.1016/j.chemosphere.2023.138436

Cited by 9 publications

(1 citation statement)

References 28 publications

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“…Lately, transition metal selenides (TMSes) have been explored for SC electrodes due to their high theoretical capacities, better electronic conductivity, and electrochemical activity in comparison to sulfide/oxide analogues. 6 As a typical TMSe, cobalt selenides (i.e., Co 0.85 Se, CoSe 2 , and CoSe) have been widely applied in various energy applications such as electrocatalytic hydrogen generation, 7 solar cells, 8 photocatalysis, 9 batteries, 10 and SCs 11 on account of their semiconductor properties and low optical band gap. 12 When applied as SC electrodes, cobalt selenides exhibited out- standing energy storage properties.…”

Section: Introductionmentioning

confidence: 99%

Integration of Polymorphic Co_xSe_y on MXene-Incorporated Self-Templated Three-Dimensional Graphene Foam to Augment Supercapacitor Performance through Componential and Structural Modifications

Chaudhary,

Zulfiqar,

Katubi

et al. 2024

ACS Appl. Energy Mater.

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Transition metal selenides (TMSes) possess rich redox chemistry and, consequently, are potential candidates for supercapacitor applications. Unfortunately, the actual capacitance behavior of TMSes is generally lower than the theoretical value due to a small number of exposed active sites, sluggish charge transfer, and inferior ion diffusivity. Moreover, the dramatic volume changes during the charge/discharge process adversely affects the stability of active materials. Herein, polymorphic Co x Se y (Co 0.85 Se and CoSe 2 ) have been synthesized and integrated into Ti 3 C 2 T x MXene flake reinforced three-dimensional (3D) rGO foam (denoted as Co x Se y @TC/ rGOF) through a self-templating hydrothermal method. The wellconstructed foam-like architecture with 3D buildup of Ti 3 C 2 T x MXene and rGO sheets provides fast ion/mass transport to a large number of accessible active sites of spatially arranged Co x Se y in three dimensions, decreases ion diffusion distance, and provides an additional carbon content that enables capacitive characteristics. The structural advantages and intercomponent synergy lead to a superior charge storage performance for Co x Se y @TC/rGOF. Accordingly, Co x Se y @TC/rGOF delivers high specific capacities of 243.1 mAh g −1 at 1 A g −1 and 178 mAh g −1 at 12 A g −1 , greater than its counterparts, i.e., Co x Se y @rGOF (147.2 mAh g −1 at 1 A g −1 ) and Co x Se y (79.4 mAh g −1 at 1 A g −1 ). The specific capacity and Coulombic efficiency for Co x Se y @TC/rGOF retain 91.3 and 93.8% of their initial value after 5000 charge/discharge cycles, respectively. Impedance measurement shows small values of R s (1.04 Ω) and R CT (3.92 Ω) for Co x Se y @TC/rGOF. In addition, this work presents a feasible scheme to provide a basic understanding of enhanced charge storage and structural stability.

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Section: Introductionmentioning

confidence: 99%

Integration of Polymorphic Co_xSe_y on MXene-Incorporated Self-Templated Three-Dimensional Graphene Foam to Augment Supercapacitor Performance through Componential and Structural Modifications

Chaudhary,

Zulfiqar,

Katubi

et al. 2024

ACS Appl. Energy Mater.

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Electron‐Deficient Boron‐Doped g‐C₃N₄ as an Efficient and Robust Photocatalyst for Visible‐Light Driven Hydrogen Evolution from Water Splitting

Ullah,

Lu,

Chen

et al. 2024

Advanced Sustainable Systems

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Elemental doping is considered to be a promising approach for altering the electronic structure, optical absorbance, and charge separation characteristics of graphitic carbon nitride (g‐C3N4, termed as CN), thus boosting its photocatalytic performance for practical applications. Herein, a series of boron (B) doped g‐C3N4 (named as BCN) photocatalysts are developed via one‐step pyrolysis of a mixture of urea and 3‐methoxycarbonyl‐5‐nitriophenylboronic acid (MCNPBA). The results show that B‐atoms have been successfully incorporated into the g‐C3N4 network. The as‐synthesized BCN‐x (x shows the weight content of MCNPBA) photocatalysts are evaluated in photocatalytic hydrogen (H2) evolution from water splitting under visible‐light (λ ≥ 420 nm). The optimized BCN‐10 sample shows a maximum H2 evolution rate of 1789.93 µmol h─1 g─1, which is 6.2 times higher than that of g‐C3N4 (289.73 µmol h─1 g─1). This is attributed to the fact that the electron‐deficient B‐atoms are lewis acids that trap electrons, which in turn expands visible‐light absorption, narrows the bandgap, and prevents the recombination of photogenerated charge carriers. Moreover, B‐doping can readily modify the valence and conduction band positions of g‐C3N4, therefore augmenting the photocatalytic H2 evolution activity. This paper presents a unique rational framework for developing other functionalized electron‐deficient elemental‐doping g‐C3N4‐based photocatalysts for practical applications in solar‐to‐fuel conversion.

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Hydrothermal synthesis of bismuth-doped tungsten trioxide (Bi-WO3) for photocatalytic hydrogen production application

Ahmad,

Nde,

Khan

2024

Reac Kinet Mech Cat

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Cobalt–molybdenum–selenide nanoflowers for bifunctional visible light photocatalysis

Cited by 9 publications

References 28 publications

Integration of Polymorphic Co_xSe_y on MXene-Incorporated Self-Templated Three-Dimensional Graphene Foam to Augment Supercapacitor Performance through Componential and Structural Modifications

Integration of Polymorphic Co_xSe_y on MXene-Incorporated Self-Templated Three-Dimensional Graphene Foam to Augment Supercapacitor Performance through Componential and Structural Modifications

Electron‐Deficient Boron‐Doped g‐C₃N₄ as an Efficient and Robust Photocatalyst for Visible‐Light Driven Hydrogen Evolution from Water Splitting

Hydrothermal synthesis of bismuth-doped tungsten trioxide (Bi-WO3) for photocatalytic hydrogen production application

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Cobalt–molybdenum–selenide nanoflowers for bifunctional visible light photocatalysis

Cited by 9 publications

References 28 publications

Integration of Polymorphic CoxSey on MXene-Incorporated Self-Templated Three-Dimensional Graphene Foam to Augment Supercapacitor Performance through Componential and Structural Modifications

Integration of Polymorphic CoxSey on MXene-Incorporated Self-Templated Three-Dimensional Graphene Foam to Augment Supercapacitor Performance through Componential and Structural Modifications

Electron‐Deficient Boron‐Doped g‐C3N4 as an Efficient and Robust Photocatalyst for Visible‐Light Driven Hydrogen Evolution from Water Splitting

Hydrothermal synthesis of bismuth-doped tungsten trioxide (Bi-WO3) for photocatalytic hydrogen production application

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Integration of Polymorphic Co_xSe_y on MXene-Incorporated Self-Templated Three-Dimensional Graphene Foam to Augment Supercapacitor Performance through Componential and Structural Modifications

Integration of Polymorphic Co_xSe_y on MXene-Incorporated Self-Templated Three-Dimensional Graphene Foam to Augment Supercapacitor Performance through Componential and Structural Modifications

Electron‐Deficient Boron‐Doped g‐C₃N₄ as an Efficient and Robust Photocatalyst for Visible‐Light Driven Hydrogen Evolution from Water Splitting