Platinum single-atom catalyst coupled with transition metal/metal oxide heterostructure for accelerating alkaline hydrogen evolution reaction

Nature Communications, Год журнала: 2021, Номер 12(1)

Опубликована: Июнь 18, 2021

Single-atom catalysts provide an effective approach to reduce the amount of precious metals meanwhile maintain their catalytic activity. However, sluggish activity for alkaline water dissociation has hampered advances in highly efficient hydrogen production. Herein, we develop a single-atom platinum immobilized NiO/Ni heterostructure (PtSA-NiO/Ni) as evolution catalyst. It is found that Pt single atom coupled with enables tunable binding abilities hydroxyl ions (OH*) and (H*), which efficiently tailors energy promotes H* conversion accelerating reaction. A further enhancement achieved by constructing PtSA-NiO/Ni nanosheets on Ag nanowires form hierarchical three-dimensional morphology. Consequently, fabricated catalyst displays high performances quite mass 20.6 mg-1 at overpotential 100 mV, significantly outperforming reported catalysts.

Язык: Английский

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Direct observation of active catalyst surface phases and the effect of dynamic self-optimization in NiFe-layered double hydroxides for alkaline water splitting

Energy & Environmental Science, Год журнала: 2019, Номер 12(2), С. 572 - 581

Опубликована: Янв. 1, 2019

Identification of active catalyst surface phases and the influence dynamic self-optimization in NiFe-layered double hydroxides for alkaline water splitting.

Язык: Английский

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Metal oxide-based materials as an emerging family of hydrogen evolution electrocatalysts

Energy & Environmental Science, Год журнала: 2020, Номер 13(10), С. 3361 - 3392

Опубликована: Янв. 1, 2020

Metal oxide-based materials are emerging as a promising family of hydrogen evolution reaction (HER) electrocatalysts.

Язык: Английский

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Heterogeneous Bimetallic Phosphide Ni₂P‐Fe₂P as an Efficient Bifunctional Catalyst for Water/Seawater Splitting

Advanced Functional Materials, Год журнала: 2020, Номер 31(1)

Опубликована: Сен. 28, 2020

Abstract Developing high‐performance and cost‐effective bifunctional electrocatalysts for large‐scale water electrolysis is desirable but remains a significant challenge. Most existing nano‐ micro‐structured require complex synthetic procedures, making scale‐up highly challenging. Here, heterogeneous Ni 2 P‐Fe P microsheet synthesized by directly soaking foam in hydrochloric acid an iron nitrate solution, followed phosphidation. Benefiting from high intrinsic activity, abundant active sites, superior transfer coefficient, this self‐supported electrocatalyst shows superb catalytic activity toward overall splitting, requiring low voltages of 1.682 1.865 V to attain current densities 100 500 mA cm −2 1 m KOH, respectively. Such performance the benchmark IrO || Pt/C pair also places among best catalysts reported thus far. Furthermore, its enhanced corrosion resistance hydrophilic surface make it suitable seawater splitting. It able achieve KOH at 1.811 2.004 V, respectively, which, together with robust durability, demonstrates great potential realistic electrolysis. This work presents general economic approach fabrication metallic phosphide water/seawater electrocatalysis.

Язык: Английский

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Recent advances in layered double hydroxide electrocatalysts for the oxygen evolution reaction

Journal of Materials Chemistry A, Год журнала: 2019, Номер 7(10), С. 5069 - 5089

Опубликована: Янв. 1, 2019

This review summarizes recent progress in layered double hydroxide oxygen evolution reaction electrocatalysts including design strategies, key issues and future prospects.

Язык: Английский

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Modulating electronic structure of metal-organic frameworks by introducing atomically dispersed Ru for efficient hydrogen evolution

Nature Communications, Год журнала: 2021, Номер 12(1)

Опубликована: Март 1, 2021

Abstract Developing high-performance electrocatalysts toward hydrogen evolution reaction is important for clean and sustainable energy, yet still challenging. Herein, we report a single-atom strategy to construct excellent metal-organic frameworks (MOFs) electrocatalyst (NiRu 0.13 -BDC) by introducing atomically dispersed Ru. Significantly, the obtained NiRu -BDC exhibits outstanding activity in all pH, especially with low overpotential of 36 mV at current density 10 mA cm −2 1 M phosphate buffered saline solution, which comparable commercial Pt/C. X-ray absorption fine structures functional theory calculations reveal that Ru can modulate electronic structure metal center MOF, leading optimization binding strength H 2 O H*, enhancement HER performance. This work establishes as an efficient approach MOFs catalyst design.

Язык: Английский

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Layered double hydroxide-based electrocatalysts for the oxygen evolution reaction: identification and tailoring of active sites, and superaerophobic nanoarray electrode assembly

Chemical Society Reviews, Год журнала: 2021, Номер 50(15), С. 8790 - 8817

Опубликована: Янв. 1, 2021

The electrocatalytic oxygen evolution reaction (OER) is a critical half-cell for hydrogen production via water electrolysis. However, the practical OER suffers from sluggish kinetics and thus requires efficient electrocatalysts. Transition metal-based layered double hydroxides (LDHs) represent one of most active classes catalysts. An in-depth understanding activity LDH based electrocatalysts can promote further rational design site regulation high-performance In this review, fundamental structural characteristics LDHs demonstrated first, then comparisons discussions recent advances in as highly catalysts alkaline media are offered, which include both experimental computational methods. On top identification characterization on an atomic scale, strategies to summarised, including doping, intercalation defect-making. Furthermore, concept superaerophobicity, has profound impact performance gas electrodes, explored enhance their derivatives large scale OER. addition, certain operating standards measurements proposed avoid inconsistency evaluating LDHs. Finally, several key challenges using anode materials splitting, such issue stability adoption membrane-electrode-assembly electrolysers, emphasized shed light future research directions.

Язык: Английский

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“Superaerophobic” Nickel Phosphide Nanoarray Catalyst for Efficient Hydrogen Evolution at Ultrahigh Current Densities

Journal of the American Chemical Society, Год журнала: 2019, Номер 141(18), С. 7537 - 7543

Опубликована: Апрель 22, 2019

The design of highly efficient non-noble-metal electrocatalysts for large-scale hydrogen production remains an ongoing challenge. We report here a Ni2P nanoarray catalyst grown on commercial Ni foam substrate, which demonstrates outstanding electrocatalytic activity and stability in basic electrolyte. high catalytic can be attributed to the favorable electron transfer, superior intrinsic activity, intimate connection between nanoarrays their substrate. Moreover, unique "superaerophobic" surface feature enables remarkable capability withstand internal external forces release situ generated H2 bubbles timely manner at large current densities (such as >1000 mA cm-2) where evolution becomes vigorous. Our results highlight that aerophobic structure is essential catalyze gas practical applications.

Язык: Английский

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Atomic and electronic modulation of self-supported nickel-vanadium layered double hydroxide to accelerate water splitting kinetics

Nature Communications, Год журнала: 2019, Номер 10(1)

Опубликована: Авг. 29, 2019

Abstract Herein, ruthenium (Ru) and iridium (Ir) are introduced to tailor the atomic electronic structure of self-supported nickel-vanadium (NiV) layered double hydroxide accelerate water splitting kinetics, origin high hydrogen evolution reaction (HER) oxygen (OER) activities analyzed at level. X-ray photoelectron spectroscopy absorption near-edge studies reveal synergistic interactions among Ni, V, Ru cations. Raman spectra Fourier wavelet transform analyses extended fine indicate modulated local coordination environments around Ni V cations, existence vacancies. The Debye–Waller factor suggests a severely distorted octahedral environment caused by incorporation Ir. Theoretical calculations further confirm that or Ir doping could optimize adsorption energy intermediates in Volmer Heyrovsky steps for HER whole kinetic process OER.

Язык: Английский

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Doping regulation in transition metal compounds for electrocatalysis

Chemical Society Reviews, Год журнала: 2021, Номер 50(17), С. 9817 - 9844

Опубликована: Янв. 1, 2021

This review summarizes the recent progress related to field of doping regulation in transition metal compounds, aiming give an overview this strategy for designing high-performance catalysts towards electrocatalytic applications.

Язык: Английский

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