Two-dimensional amorphous heterostructures of Ag/a-WO3- for high-efficiency photocatalytic performance

Ren, Yumei; Li, Chong; Xu, Qun; Yan, Jun; Li, Youzeng; Yuan, Pengfei; Xia, Huicong; Niu, Chunyao; Yang, Xinan; Jia, Yu

doi:10.1016/j.apcatb.2019.01.015

Cited by 71 publications

(42 citation statements)

References 52 publications

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“…The average d‐band center value of Co atoms is accordingly changed from −4.20 eV for CoCr LDHs to −5.15 eV CoCrRu LDHs, contributing to the weaker binding strength toward oxygenates. Moreover, just below the Fermi level the peak of Co‐d states of CoCr LDHs is more sharp than that of CoCrRu LDHs, indicating that the charge transfer to O*/OH* from CoCr LDHs is more feasible than from CoCrRu LDHs . These qualitative analyses are supported by the Bader charge results, i.e., both the O* and OH* get more electrons from CoCr LDHs than from CoCrRu LDHs (Table S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 58%

Ruthenium‐Doped Cobalt–Chromium Layered Double Hydroxides for Enhancing Oxygen Evolution through Regulating Charge Transfer

Dong

Zhang

et al. 2020

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Exploring the origin of transition metal (TM) lattice‐doped layered double hydroxides (LDHs) toward the oxygen evolution reaction (OER) plays a crucial role in engineering efficient electrocatalysts. Without understanding the physics behind the TM‐induced catalytic enhancements, it would be challenging to design the next generation of electrocatalysts. Herein, single Ru atoms are introduced into a CoCr LDHs lattice to improve activity. In 0.1 m KOH, CoCrRu LDHs require only 290 mV overpotential to drive to 10 mA cm−2 and show a Tafel slope of 56.12 mV dec−1. Electronic structure analyses based on density functional theory confirm that promoted OER activity originates from synergetic charge transfer among Ru, Cr, and Co elements. Specifically, Ru dopants can downshift d states of Co and enhance electron donation of Cr to oxygenates, which essentially breaks the scaling relation and achieves higher activity. This work provides insights into how single atomic Ru dopant tunes the electronic structures of its neighbor's active site Co and thus increases OER activities.

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Section: Resultsmentioning

confidence: 58%

Ruthenium‐Doped Cobalt–Chromium Layered Double Hydroxides for Enhancing Oxygen Evolution through Regulating Charge Transfer

Dong

Zhang

et al. 2020

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“…It can be attributed to the strong surface plasmon resonance (SPR) effect of Ag NPs, which agrees well with other reports. [26][27][28][29]…”

Section: Microscopy (Tem) From Figuresmentioning

confidence: 99%

Plasmon‐Enhanced Charge Separation and Surface Reactions Based on Ag‐Loaded Transition‐Metal Hydroxide for Photoelectrochemical Water Oxidation

Ning

Yin

Fan

et al. 2021

Advanced Energy Materials

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Coating photoanodes with transition‐metal hydroxides (TMH) is a promising approach for improving photoelectrochemical (PEC) water oxidation. However, the present system still suffers from high charge recombination and sluggish surface reactions. Herein, effective charge separation is achieved at the same time as boosting the surface catalytic reaction for PEC water splitting through decoration of plasmon metal (Ag) in a semiconductor/TMH coupling system. The kinetic behavior at the semiconductor/TMH and TMH/electrolyte interfaces is systematically evaluated by employing intensity modulated photocurrent spectroscopy, scanning photoelectrochemical microscopy, and oxygen evolution reaction model. It is found that both charge transfer and surface catalysis dynamics are enhanced through local surface plasmon resonance of Ag nanoparticles. The as‐prepared BiVO4/Co(OH)x‐Ag exhibits remarkable activity (≈4.64 times) in PEC water splitting in comparison with pure BiVO4. Notably, this smart approach can be also applied to other TMH (Ni(OH)2), reflecting its universality. This work provides a guiding design method for solar energy conversion with the semiconductor‐TMH system.

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“…Undoubtedly, the 2D amorphous monolayer materials are highly desirable to study the amorphous catalytic mechanism because of its more localized Anderson tail states in the band gap . Indeed, our previous researches on 2D amorphous MoO 3‐ x and WO 3‐ x monolayers showed that they exhibit controllable electronic density for biological detection and enhanced photoelectrocatalytic performance of OER, respectively. These achievements provide the prototype systems to explore the catalytic mechanism of 2D amorphous monolayers and can guide to design high‐efficiency catalysis.…”

Section: Figurementioning

confidence: 99%

Anderson Localization in 2D Amorphous MoO_3‐x Monolayers for Electrochemical Ammonia Synthesis

Liu

et al. 2019

ChemCatChem

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Two‐dimensional amorphous semiconductor (2DAS) monolayers can be regarded as a new phase of 2D monolayers materials and will serve as a promising field for the various electronic and optoelectronic applications. Here, together with the first‐principles calculations within density functional theory, we experimentally demonstrate that the 2DAS MoO3‐x monolayers can enhance the electrochemical nitrogen reduction reaction (NRR). To be specific, the NH3 yield and faradaic efficiency (FE) reach 35.83 ug h−1 mg−1cat at −0.40 V and 12.01 % at −0.20 V vs. reversible hydrogen electrode (RHE), respectively, and which can be dramatically improved than that of reported defective MoO3 nanosheets. Further theoretical calculations reveal that the high electrochemical performance in NH3 yield is contributed to the strong Anderson localization and electron confinement dimensionally. And such Anderson tail states can resonate effectively with the states of intermediate HNNH, playing the critical role in the rate limiting step of NRR. Integrated experimental findings and theoretical understanding, a new concept of Anderson confinement catalysis is put forward, and could be extended to other 2DAS for potential catalytic reactions.

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Two-dimensional amorphous heterostructures of Ag/a-WO3- for high-efficiency photocatalytic performance

Cited by 71 publications

References 52 publications

Ruthenium‐Doped Cobalt–Chromium Layered Double Hydroxides for Enhancing Oxygen Evolution through Regulating Charge Transfer

Ruthenium‐Doped Cobalt–Chromium Layered Double Hydroxides for Enhancing Oxygen Evolution through Regulating Charge Transfer

Plasmon‐Enhanced Charge Separation and Surface Reactions Based on Ag‐Loaded Transition‐Metal Hydroxide for Photoelectrochemical Water Oxidation

Anderson Localization in 2D Amorphous MoO_3‐x Monolayers for Electrochemical Ammonia Synthesis

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Two-dimensional amorphous heterostructures of Ag/a-WO3- for high-efficiency photocatalytic performance

Cited by 71 publications

References 52 publications

Ruthenium‐Doped Cobalt–Chromium Layered Double Hydroxides for Enhancing Oxygen Evolution through Regulating Charge Transfer

Ruthenium‐Doped Cobalt–Chromium Layered Double Hydroxides for Enhancing Oxygen Evolution through Regulating Charge Transfer

Plasmon‐Enhanced Charge Separation and Surface Reactions Based on Ag‐Loaded Transition‐Metal Hydroxide for Photoelectrochemical Water Oxidation

Anderson Localization in 2D Amorphous MoO3‐x Monolayers for Electrochemical Ammonia Synthesis

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Anderson Localization in 2D Amorphous MoO_3‐x Monolayers for Electrochemical Ammonia Synthesis