MXene Quantum Dots/Copper Nanocomposites for Synergistically Enhanced N2 Electroreduction

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外文摘要：Electrocatalytic N2 reduction reaction(NRR)represents an appealing solution for sustainable ammonia production,whereas exploring high-efficiency NRR catalysts is highly desired but extremely challenging.Herein,we combine Ti3C2Tx-MXene quantum dots(MQDs)with porous Cu nanosheets to design a novel heterostructured MQDs/Cu as an effective and durable NRR catalyst.Impressively,MQDs/Cu showed a synergistically enhanced NRR activity with an NH3 yield of 78.5 μg h-1 mg-1(-0.5 V)and a Faradaic efficiency of 21.3％(-0.4 V),far superior to pure MQDs and Cu,and outperforming the majority of the state-of-the-art NRR catalysts.Density function theory computations demonstrated that the synergy of MQDs and Cu enabled the creation of interfacial Cu-Ti dimer as dual-active-centers to strongly activate the absorbed N2 and promote the*N2H formation,consequently resulting in the much reduced energy barriers and greatly enhanced NRR performance.

外文关键词：

density functional theoryelectrocatalytic nitrogen fixationheterostructureMXene quantum dots

作者：

Yonghua Cheng、Xingchuan Li、Peng Shen、Yali Guo、Ke Chu

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作者单位：

School of Materials Science and Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Gansu ProvinceNatural Science Foundation of Gansu ProvinceLongyuan Youth Innovative and Entrepreneurial Talents ProjectFoundation of A Hundred Youth Talents Training Program of Lanzhou Jiaotong University

项目编号：

517610245216102520JR10RA24121JR1RA247[2021]17

出版年：

2023

DOI：

10.1002/eem2.12268

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(1)

参考文献量68