首页|Rational design of vitamin C/defective carbon van der Waals heterostructure for enhanced activity,durability and storage stability toward oxygen reduction reaction
Rational design of vitamin C/defective carbon van der Waals heterostructure for enhanced activity,durability and storage stability toward oxygen reduction reaction
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Metal-free defective carbon materials with abundant active sites have been widely studied as low-cost and efficient oxygen reduction reaction(ORR)electrocatalysts in metal-air batteries.However,the active sites in defective carbon are easily subjected to serious oxidation or hydroxylation during ORR or storage,leading to rapid degradation of activity.Herein,we design a van der Waals heterostructure comprised of vitamin C(VC)and defective carbon(DC)to not only boost the activity but also enhance the durability and storage stability of the DC-VC electrocatalyst.The formation of VC van der Waals between DC and VC is demonstrated to be an effective strategy to protect the defect active sites from oxidation and hydroxylation degradation,thus significantly enhancing the electrochemical durability and storage anti-aging performance.Moreover,the DC-VC van der Waals can reduce the reaction energy barrier to facilitate the ORR.These findings are also confirmed by operando Fourier transform infrared spectroscopy and density functional theory calculations.It is necessary to mention that the preparation of this DC-VC electrocatalyst can be scaled up,and the ORR performance of the largely produced electrocatalyst is demonstrated to be very consistent.Furthermore,the DC-VC-based aluminum-air batteries display very competitive power density with good performance maintenance.
Van der Waals heterostructureOxygen reduction reactionStabilityScalable productionAluminum-air battery
Ruiqi Cheng、Kaiqi Li、Huanxin Li、Tianshuo Zhao、Yibo Wang、Qingyue Xue、Jiao Zhang、Chaopeng Fu
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Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
Christopher Ingold Laboratory,Department of Chemistry,University College London,London WC1H 0AJ,UK
Department of Chemistry,Physical & Theoretical Chemistry Laboratory,University of Oxford,South Parks Road,Oxford OX1 3QZ,UK
National Natural Science Foundation of ChinaNatural Science Foundation of ShanghaiNatural Science Foundation of Shanghai
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