Enriched d-Band Holes Enabling Fast Oxygen Evolution Kinetics on Atomic-Layered Defect-Rich Lithium Cobalt Oxide Nanosheets

Xiaobo Zheng; Yaping Chen; Weihong LaiPeng LiChenliang YeNana LiuShi Xue DouHongge PanWenping Sun

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Enriched d-Band Holes Enabling Fast Oxygen Evolution Kinetics on Atomic-Layered Defect-Rich Lithium Cobalt Oxide Nanosheets

机译：Enriched d-Band Holes Enabling Fast Oxygen Evolution Kinetics on Atomic-Layered Defect-Rich Lithium Cobalt Oxide Nanosheets

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Developing a reliable synthesis strategy to concurrently realize electronicstructure modulation and two-dimensionalization of materials is of paramountsignificance yet still challenging. Herein, a facile and universalstrategy is reported to fabricate defect-abundant atomic-layered materialswith unique electronic structures by mechanical shear-assisted exfoliation.As a proof-of-concept demonstration, atomic-layered defect-rich LiCoO_2nanosheets (AD-LCO) are successfully synthesized, which enable acceleratedoxygen evolution kinetics with a substantially decreased oxygenevolution reaction overpotential by 184 and 216 mV at 10 and 50 mA cm–2,respectively. X-ray absorption spectroscopy suggests that AD-LCO possessesmore d-band holes and enhanced Co-O covalency. Density functional theorycalculations reveal that the presence of Co lattice vacancies can optimizethe adsorption kinetics of intermediates, consequently lowering the energybarrier of the rate-determining step. Importantly, this method has universalapplicability to the fabrication of other ultrathin defect-rich 2D materialssuch as BN, WS_2, and MoS_2. The study has potential implications foroffering novel insights into the rational design of ultrathin 2D materials withabundant surface defects for various applications.

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《Advanced functional materials》 |2022年第28期|2200663.1-2200663.9|共9页
作者
Xiaobo Zheng; Yaping Chen; Weihong LaiPeng LiChenliang YeNana LiuShi Xue DouHongge PanWenping Sun;
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School of Materials Science and EngineeringState Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou 310027, China, Institute for Superconducting and Electronic MaterialsAustralia Institute for Innovation MaterialsUniversity of Wollongon;

School of Materials Science and EngineeringState Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou 310027, China;

Institute for Superconducting and Electronic MaterialsAustralia Institute for Innovation MaterialsUniversity of WollongongWollongong, NSW 2500, AustraliaKey College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060, ChinaSchool of Materials Science and EngineeringState Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou 310027, China, National Institute of Science and Technology for New EnergyXi’an Technological UniversityXi’an 710021, China;

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d-band holes; lithium cobalt oxide; mechanical shear-assisted exfoliation; nanosheets; oxygen evolution reaction;

Enriched d-Band Holes Enabling Fast Oxygen Evolution Kinetics on Atomic-Layered Defect-Rich Lithium Cobalt Oxide Nanosheets

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