Abstract
The CO2 reduction reaction (CRR), which is key to addressing global environmental and energy issues, must overcome the strong C = O bond and is hindered by low CRR selectivity and activity. Here, we unravel the ensemble effect of catalytically active sites for promotion of CRR while suppressing hydrogen evolution reactions (HERs). We design a 2D/2D hybrid consisting of an ordered assembly of nickel-rich Ni-Mn layered double hydroxide (LDH) nanosheets (NSs) and oxygen vacancies (OVs)-rich Mn3O4 (OVs-Mn3O4) NSs. On its own, Ni-Mn LDH demonstrates high CRR selectivity but mediocre CRR efficiency, whereas OVs-Mn3O4 gives a higher efficiency but poorer selectivity. The 2D/2D hybrid inherits advantages from both components, attaining high CRR selectivity and markedly higher efficiency than Ni-Mn LDH and OVs-Mn3O4. Calculations and in situ Fourier transform infrared spectroscopy (FT-IR) measurements reveal that nickel sites in the 2D/2D hybrid activate CO2 to generate CO2•– via a one-electron injection, whereas OVs in OVs-Mn3O4 promote light harvesting and charge transport without activating unwanted HERs.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
