Electronic structure and enhanced photoelectrocatalytic performance of RuxZn1−xO/Ti electrodes

Shao, Yanqun; Feng, Keke; Guo, Jie; Zhang, Rongrong; He, Sijiang; Wei, Xinli; Lin, Yu‐Ting; Ye, Zhanghao; Chen, Kongfa

doi:10.1007/s40145-021-0486-x

Cited by 32 publications

(11 citation statements)

References 76 publications

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“…However, noble-metal co-catalysts cannot be widely used because of their high price and low reserve. Thus, it is urgent to find a new co-catalyst to replace them [28][29][30]. MXene is a kind of twodimensional (2D) materials with a general formula of M n+1 X n T x , where M, X, and T denote transition metals, C or N, and surface terminations involving -OH, -O, and -F, respectively [31][32][33][34][35][36].…”

Section: Introduction mentioning

confidence: 99%

Efficient photocatalytic hydrogen evolution coupled with benzaldehyde production over 0D Cd0.5Zn0.5S/2D Ti3C2 Schottky heterojunction

et al. 2022

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Converting water into hydrogen fuel and oxidizing benzyl alcohol to benzaldehyde simultaneously under visible light illumination is of great significance, but the fast recombination of photogenerated carriers in photocatalysts seriously decreases the conversion efficiency. Herein, a novel dual-functional 0D Cd0.5Zn0.5S/2D Ti3C2 hybrid was fabricated by a solvothermally in-situ generated assembling method. The Cd0.5Zn0.5S nano-spheres with a fluffy surface completely and uniformly covered the ultrathin Ti3C2 nanosheets, leading to the increased Schottky barrier (SB) sites due to a large contact area, which could accelerate the electron—hole separation and improve the light utilization. The optimized Cd0.5Zn0.5S/Ti3C2 hybrid simultaneously presents a hydrogen evolution rate of 5.3 mmol/(g·h) and a benzaldehyde production rate of 29.3 mmol/(g·h), which are ∼3.2 and 2 times higher than those of pristine Cd0.5Zn0.5S, respectively. Both the multiple experimental measurements and the density functional theory (DFT) calculations further demonstrate the tight connection between Cd0.5Zn0.5S and Ti3C2, formation of Schottky junction, and efficient photogenerated electron-hole separation. This paper suggests a dual-functional composite catalyst for photocatalytic hydrogen evolution and benzaldehyde production, and provides a new strategy for preventing the photogenerated electrons and holes from recombining by constructing a 0D/2D heterojunction with increased SB sites.

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Section: Introduction mentioning

confidence: 99%

Efficient photocatalytic hydrogen evolution coupled with benzaldehyde production over 0D Cd0.5Zn0.5S/2D Ti3C2 Schottky heterojunction

et al. 2022

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“…In addition, the threshold wavelengths of Co-TDC and CF are determined to be 619 nm and 685 nm, respectively. The corresponding bandgap and conduction band (CB)/valence band (VB) position can be calculated according to the following formulas [39][40][41]:…”

Section: Resultsmentioning

confidence: 99%

Metal–Organic-Framework-Derived Ball-Flower-like Porous Co3O4/Fe2O3 Heterostructure with Enhanced Visible-Light-Driven Photocatalytic Activity

Cao

et al. 2022

Nanomaterials

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A porous ball-flower-like Co3O4/Fe2O3 heterostructural photocatalyst was synthesized via a facile metal–organic-framework-templated method, and showed an excellent degradation performance in the model molecule rhodamine B under visible light irradiation. This enhanced photocatalytic activity can be attributed to abundant photo-generated holes and hydroxyl radicals, and the combined effects involving a porous structure, strong visible-light absorption, and improved interfacial charge separation. It is notable that the ecotoxicity of the treated reaction solution was also evaluated, confirming that an as-synthesized Co3O4/Fe2O3 catalyst could afford the sunlight-driven long-term recyclable degradation of dye-contaminated wastewater into non-toxic and colorless wastewater.

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“…It is widely known that hydrogen is deemed as an ideal energy carrier, which serves as a perfect alternative to fossil fuels owing to its environmental friendliness and high energy density features [1]. Water splitting is a very promising technique for hydrogen generation, which gives out hydrogen via the hydrogen evolution reaction (HER) enabled by photocatalysts [2][3][4], electrocatalysts, or photoelectrocatalysts [5,6], where solar energy can be utilized directly or indirectly [7,8]. To enable practical applications in water splitting, it is essential to develop highly active, efficient, and robust electrocatalysts from economical resources [9,10].…”

Section: Introductionmentioning

confidence: 99%

Experimental and DFT studies of flower-like Ni-doped Mo2C on carbon fiber paper: A highly efficient and robust HER electrocatalyst modulated by Ni(NO3)2 concentration

et al. 2022

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Developing highly efficient and stable non-precious metal catalysts for water splitting is urgently required. In this work, we report a facile one-step molten salt method for the preparation of self-supporting Ni-doped Mo2C on carbon fiber paper (Ni-Mo2CCB/CFP) for hydrogen evolution reaction (HER). The effects of nickel nitrate concentration on the phase composition, morphology, and electrocatalytic HER performance of Ni-doped Mo2C@CFP electrocatalysts was investigated. With the continuous increase of Ni(NO3)2 concentration, the morphology of Mo2C gradually changes from granular to flower-like, providing larger specific surface area and more active sites. Doping nickel (Ni) into the crystal lattice of Mo2C largely reduces the impedance of the electrocatalysts and enhances their electrocatalytic activity. The as-developed Mo2C-3 M Ni(NO3)2/CFP electrocatalyst exhibits high catalytic activity with a small overpotential of 56 mV at a current density of 10 mA·cm−2. This catalyst has a fast HER kinetics, as demonstrated by a very small Tafel slope of 27.4 mV·dec−1, and persistent long-term stability. A further higher Ni concentration had an adverse effect on the electrocatalytic performance. Density functional theory (DFT) calculations further verified the experimental results. Ni doping could reduce the binding energy of Mo-H, facilitating the desorption of the adsorbed hydrogen (Hads) on the surface, thereby improving the intrinsic catalytic activity of Ni-doped Mo2C-based catalysts. Nevertheless, excessive Ni doping would inhibit the catalytic activity of the electrocatalysts. This work not only provides a simple strategy for the facile preparation of non-precious metal electrocatalysts with high catalytic activity, but also unveils the influence mechanism of the Ni doping concentration on the HER performance of the electrocatalysts from the theoretical perspective.

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Electronic structure and enhanced photoelectrocatalytic performance of RuxZn1−xO/Ti electrodes

Cited by 32 publications

References 76 publications

Efficient photocatalytic hydrogen evolution coupled with benzaldehyde production over 0D Cd0.5Zn0.5S/2D Ti3C2 Schottky heterojunction

Efficient photocatalytic hydrogen evolution coupled with benzaldehyde production over 0D Cd0.5Zn0.5S/2D Ti3C2 Schottky heterojunction

Metal–Organic-Framework-Derived Ball-Flower-like Porous Co3O4/Fe2O3 Heterostructure with Enhanced Visible-Light-Driven Photocatalytic Activity

Experimental and DFT studies of flower-like Ni-doped Mo2C on carbon fiber paper: A highly efficient and robust HER electrocatalyst modulated by Ni(NO3)2 concentration

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