Piezopotential-driven simulated electrocatalytic nanosystem of ultrasmall MoC quantum dots encapsulated in ultrathin N-doped graphene vesicles for superhigh H2 production from pure water

Feng, Wenhui; Yuan, Jie; Gao, Fan; Weng, Bo; Hu, Wenting; Lei, Yanhua; Huang, Xueyan; Yang, Lu; Shen, Jie; Xu, Dongdong; Zhang, Xiangchao; Liu, Ping; Zhang, Shiying

doi:10.1016/j.nanoen.2020.104990

Cited by 72 publications

(40 citation statements)

References 95 publications

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“…g,h) H 2 evolution performance comparison of UT‐g‐C 3 N 4 with the reported piezocatalysts (g) and g‐C 3 N 4 ‐based photocatalysts (h). [ 14,16,17,29–49 ]…”

Section: Resultsmentioning

confidence: 99%

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Exceptional Cocatalyst‐Free Photo‐Enhanced Piezocatalytic Hydrogen Evolution of Carbon Nitride Nanosheets from Strong In‐Plane Polarization

et al. 2021

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Utilizing mechanical energy to produce hydrogen is emerging as a promising way to generate renewable energy, but is challenged by low efficiency and scanty cognition. In this work, graphitic carbon nitride (g‐C3N4) with an atomically thin sheet‐like structure is applied for prominent piezocatalytic and photo‐enhanced piezocatalytic H2 production. It is revealed that the anomalous piezoelectricity in g‐C3N4 originates from the strong in‐plane polarization along the a‐axis, contributed by the superimposed polar tri‐s‐triazine units and flexoelectric effect derived from the structured triangular cavities, which provides powerful electrochemical driving force for the water reduction reaction. Furthermore, the photo‐enhanced charge transfer enables g‐C3N4 nanosheets to reserve more energized polarization charges to fully participate in the reaction at the surface reactive sites enriched by strain‐induced carbon vacancies. Without any cocatalysts, an exceptional photo‐piezocatalytic H2 evolution rate of 12.16 mmol g−1 h−1 is delivered by the g‐C3N4 nanosheets, far exceeding that of previously reported piezocatalysts and g‐C3N4 photocatalysts. Further, high pure‐water‐splitting performance with production of the value‐added oxidation product H2O2 via photo‐piezocatalysis is also disclosed. This work not only exposes the potential of g‐C3N4 as a piezo‐semiconductor for catalytic H2 evolution, but also breaks a new ground for the conversion of solar and mechanical energy by photomediated piezocatalytic reaction.

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“…g,h) H 2 evolution performance comparison of UT‐g‐C 3 N 4 with the reported piezocatalysts (g) and g‐C 3 N 4 ‐based photocatalysts (h). [ 14,16,17,29–49 ]…”

Section: Resultsmentioning

confidence: 99%

“…The high H 2 evolution rate (≈1.69 mmol g −1 h −1 ) indicates that the functionalized graphene is an excellent candidate for piezocatalytic H 2 production. [ 17 ] Though encouraging progress has been made, exploiting new 2D piezocatalyst system for more efficient mechanical‐energy triggered H 2 evolution is highly challenging.…”

Section: Introductionmentioning

confidence: 99%

Exceptional Cocatalyst‐Free Photo‐Enhanced Piezocatalytic Hydrogen Evolution of Carbon Nitride Nanosheets from Strong In‐Plane Polarization

et al. 2021

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“…From the piezo-responsive amplitude curve and phase curve in Figure 3c, the phase angle was changed by 180°and formed a complete butterfly circuit under the reversal of direct current (DC) bias field, further confirming excellent piezoelectricity of the BTO NFs. 27,28 The electromechanical coupling performance was detected by constructing a flexible sensor with the BTO NF film. The cyclic output voltages in a pressing mode were increased from 1.5 to 3.8 V when increasing the pressures from 1.22 to 8.04 N (Figure 3d), corresponding to a high voltage sensitivity of 29 mV/Pa (Figure S8a).…”

Section: Resultsmentioning

confidence: 99%

Dynamic Regulation of Lithium Dendrite Growth with Electromechanical Coupling Effect of Soft BaTiO₃ Ceramic Nanofiber Films

et al. 2021

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Lithium (Li) metal batteries (LMBs) offer great opportunity for developing high-energy density energy-storagesystems, but the anodes suffer a severe problem of dendrite growth that hinders the practical applications of LMBs. Here, we report a soft BaTiO 3 ceramic nanofiber film with excellent ferroelectricity and piezoelectricity that enables one to transverse the dense deposition of Li metal. During Li plating, the strong ferroelectricity reduces the Liion concentration gradient near the anode and thus facilitating their uniform deposition. Once squeezed by these Li deposits, the BaTiO 3 film generates instantaneous piezo-effect to dynamically change the subsequent Li deposition from vertical to lateral. As a result, Li−Cu cells exhibit reversible plating−stripping processes for over 200 cycles with a high Coulombic efficiency of >98.3%. When pairing with highvoltage LiNi 0.8 Co 0.15 Al 0.05 O 2 cathodes, the LMBs can retain >80% capacity in 300 cycles without forming dendrites even under challenging conditions including a high cathode loading of 7.2 mg/cm 2 , a lean electrolyte amount of 7 μL/mg, and high current rates. The findings point to a promising electromechanical coupling strategy to dynamically adjust dendrite growth for designing Li metal anodes.

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“…where I d , I r , and N represent the disk current, ring current, and collection efficiency of the RRDE (N ¼ 0.37), respectively. 23,24 For OER tests, the polarization curves were measured in 0.1 M KOH solution recorded from 1.0 to 2.0 V at a scan rate of 5 mV s À1 . Note that high-purity O 2 was bubbled through the electrolyte during the test to x the reversible oxygen potential (or ensure the O 2 /H 2 O equilibrium at 1.23 V vs. RHE).…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Coupling isolated Ni single atoms with sub-10 nm Pd nanocrystals embedded in porous carbon frameworks to boost oxygen electrocatalysis for Zn–air batteries

Wang

Lin

et al. 2022

J. Mater. Chem. A

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Piezopotential-driven simulated electrocatalytic nanosystem of ultrasmall MoC quantum dots encapsulated in ultrathin N-doped graphene vesicles for superhigh H2 production from pure water

Cited by 72 publications

References 95 publications

Exceptional Cocatalyst‐Free Photo‐Enhanced Piezocatalytic Hydrogen Evolution of Carbon Nitride Nanosheets from Strong In‐Plane Polarization

Exceptional Cocatalyst‐Free Photo‐Enhanced Piezocatalytic Hydrogen Evolution of Carbon Nitride Nanosheets from Strong In‐Plane Polarization

Dynamic Regulation of Lithium Dendrite Growth with Electromechanical Coupling Effect of Soft BaTiO₃ Ceramic Nanofiber Films

Coupling isolated Ni single atoms with sub-10 nm Pd nanocrystals embedded in porous carbon frameworks to boost oxygen electrocatalysis for Zn–air batteries

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Piezopotential-driven simulated electrocatalytic nanosystem of ultrasmall MoC quantum dots encapsulated in ultrathin N-doped graphene vesicles for superhigh H2 production from pure water

Cited by 72 publications

References 95 publications

Exceptional Cocatalyst‐Free Photo‐Enhanced Piezocatalytic Hydrogen Evolution of Carbon Nitride Nanosheets from Strong In‐Plane Polarization

Exceptional Cocatalyst‐Free Photo‐Enhanced Piezocatalytic Hydrogen Evolution of Carbon Nitride Nanosheets from Strong In‐Plane Polarization

Dynamic Regulation of Lithium Dendrite Growth with Electromechanical Coupling Effect of Soft BaTiO3 Ceramic Nanofiber Films

Coupling isolated Ni single atoms with sub-10 nm Pd nanocrystals embedded in porous carbon frameworks to boost oxygen electrocatalysis for Zn–air batteries

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Product

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Dynamic Regulation of Lithium Dendrite Growth with Electromechanical Coupling Effect of Soft BaTiO₃ Ceramic Nanofiber Films