材料科学
石墨烯
电导率
碳纳米管
催化作用
电流密度
化学工程
纳米技术
电化学
法拉第效率
电极
多孔性
密度泛函理论
复合材料
化学
物理化学
计算化学
有机化学
工程类
物理
量子力学
作者
Shilei Zhang,Pengtao Yue,Yue Zhou,Jun Li,Xun Zhu,Qian Fu,Qiang Liu
出处
期刊:Small
[Wiley]
日期:2023-06-27
卷期号:19 (43)
被引量:1
标识
DOI:10.1002/smll.202303016
摘要
Ni single-atom catalysts (SACs) are appealing for electrochemical reduction CO2 reduction (CO2 RR). However, regulating the balance between the activity and conductivity remains a challenge to Ni SACs due to the limitation of substrates structure. Herein, the intrinsic performance enhancement of Ni SACs anchored on quasi-one-dimensional graphene nanoribbons (GNRs) synthesized is demonstrated by longitudinal unzipping carbon nanotubes (CNTs). The abundant functional groups on GNRs can absorb Ni atoms to form rich Ni-N4 -C sites during the anchoring process, providing a high intrinsic activity. In addition, the GNRs, which maintain a quasi-one-dimensional structure and possess a high conductivity, interconnect with each other and form a conductive porous framework. The catalyst yields a 44 mA cm-2 CO partial current density and 96% faradaic efficiency of CO (FECO ) at -1.1 V vs RHE in an H-cell. By adopting a membrane electrode assembly (MEA) flow cell, a 95% FECO and 2.4 V cell voltage are achieved at 200 mA cm-2 current density. This work provides a rational way to synthesize Ni SACs with a high Ni atom loading, porous morphology, and high conductivity with potential industrial applications.
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