Robust and Promising Electrocatalytic Oxygen Evolution Reaction by Activated Cu–Co–B Amorphous Nanosheets

ACS Sustainable Chemistry & Engineering, Год журнала: 2023, Номер 11(6), С. 2541 - 2553

Опубликована: Фев. 2, 2023

The challenge to develop a highly efficient and affordable electrocatalyst for the oxygen evolution reaction (OER) could be fulfilled by newly developed transition metal boron amorphous alloy electrocatalyst. This successfully improve overall efficiency of electrochemical water splitting. Herein, we demonstrate development an entirely new Cu–Co–B nanosheet (NS), which can act as industrially promising OER. Among series studied compositions, surface activated CuCo2B NSs with 5–6 nm thickness offer OER performances exceptionally high current density 1000 mA cm–2 at 270 mV overpotential (η) in 1.0 M KOH electrolyte. It also afford η100 = 204 η500 256 mV, remains intact 60 h, lowest Tafel slope charge transfer resistance highest electrochemically active sites turnover frequency 87% Faradaic efficiency. fulfills commercial requirement criteria process 30 wt % KOH. Extensive experimental analyses led Cu–Co synergistic-based mechanism situ formed adsorption *OH *OOH species, reconstruction catalyst forming hydroxides/oxyhydroxides precatalyst, modulation electronic structure due rich defect nature, topological disorder catalyst. Density functional theory (DFT) studies reveal that are most candidates barrier thus energies, Cu-centers effectively synergistically enhance

Язык: Английский

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Two-Dimensional SnS Mediates NiFe-LDH-Layered Electrocatalyst toward Boosting OER Activity for Water Splitting

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер unknown

Опубликована: Апрель 26, 2024

NiFe-layered double hydroxides (NiFe-LDHs), as promising electrocatalysts, have received significant research attention for hydrogen and oxygen generation through water splitting. However, the slow oxidation kinetics of NiFe-LDH, due to limited number active sites low conductivity, hinders improvement water-splitting efficiency. Therefore, overcome obstacles, two-dimensional (2D) SnS was first explored tailor prepared NiFe-LDH via hydrothermal method. A NiFe-LDH/SnS heterojunction is built, which observed from microstructural investigations. incorporation could greatly improve conductivity sheets, reflected by reduced charge transfer resistance. Moreover, layers modulated electronic environment around sites, favoring adsorption intermediates during evolution reaction (OER) process, verified density functional theory calculations. synergistic effect induced heterostructure promoted OER activities in electrical, electronic, energetic aspects. Consequently, as-prepared electrocatalyst improved electrocatalytic performance, exhibiting 20% 27% reductions overpotential Tafel slope compared with those pristine respectively. The results provide a strategy regulating NiFe-based electrocatalysts using emerging 2D materials enhance

Язык: Английский

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Electronic and Optical Properties of Two-Dimensional MoSi₂P₄/BAs Heterostructures

The Journal of Physical Chemistry C, Год журнала: 2024, Номер 128(18), С. 7759 - 7765

Опубликована: Май 1, 2024

Vertical stacking of two semiconducting monolayers is an effective way to improve the optoelectronic performance individual monolayers. Employing first-principles calculations, MoSi2P4/BAs heterobilayers with six configurations (AA1 ∼ AA6) are investigated. In particular, electronic and optical properties AA2 configuration explored in depth due relatively high stabilities. The predicted be a direct semiconductor moderate gap at G0W0 level. It also exhibits strong absorption for near-infrared visible lights, which significantly better than that isolated MoSi2P4 monolayer. Based on G0W0+BSE light absorbance coefficients can larger 107 cm–1 near-infrared-visible range. More interestingly, type-II band alignment advantageous built-in electric field formed stacking, facilitates separation intralayer photogenerated electron–hole pairs, thus forming indirect exciton large oscillator strength long radiative lifetime several nanoseconds room temperature. These findings indicate heterobilayer good candidate new devices.

Язык: Английский

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Recent progress in MXene-based materials for lithium-ion and lithium-sulphur batteries: A comprehensive review

Journal of Energy Storage, Год журнала: 2024, Номер 92, С. 112017 - 112017

Опубликована: Май 28, 2024

Язык: Английский

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MXenes: advances in synthesis, characterisation, and applications in water purification

Environmental Technology Reviews, Год журнала: 2025, Номер 14(1), С. 273 - 309

Опубликована: Март 18, 2025

MXenes are a quickly developing group of two-dimensional (2D) materials made up carbonitrides, nitrides, and carbides transition metals, have shown great promise in water purification because their special qualities, including hydrophilicity, tunable surface chemistry, high area. Eliminating heavy organic contaminants, microbes from is one the problems that may now effectively handle thanks to recent developments preparation functionalization. Nowadays, 2D can be used as potential candidates for wastewater treatment due distinctive characteristics appealing effectiveness. These include significant chemical stability, strong electrical thermal conductivity, only available reduction sorption capability, large area, eco-friendly features. The current research on reviewed detail this paper, along with synthesis techniques, which top-down (etching MAX phases) bottom-up (direct synthesis), emphasising advantages disadvantages each. X-ray diffraction (XRD) scanning electron microscopy (SEM) techniques highlighted throughout discussion, incorporates structure, morphology, quality MXenes. In purification, operate excellent adsorbents antibacterial agents. Because remarkable physicochemical diverse drawn lot interest treatment. By giving summary prospective future directions paper highlights MXene-based filtering provide long-term solutions world's issues.

Язык: Английский

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