Developing an efficient catalyst for the electrocatalytic CO 2 reduction reaction (CO 2 RR) is highly desired because of environmental and energy issues. Herein, we report a single-atomic-site Cu catalyst supported by a Lewis acid for electrocatalytic CO 2 reduction to CH 4 . Theoretical calculations suggested that Lewis acid sites in metal oxides (e.g., Al 2 O 3 , Cr 2 O 3 ) can regulate the electronic structure of Cu atoms by optimizing intermediate absorption to promote CO 2 methanation. Based on these theoretical results, ultrathin porous Al 2 O 3 with enriched Lewis acid sites was explored as an anchor for Cu single atoms; this modification achieved a faradaic efficiency (FE) of 62% at −1.2 V (vs RHE) with a corresponding current density of 153.0 mA cm −2 for CH 4 formation. This work demonstrates an effective strategy for tailoring the electronic structure of Cu single atoms for the highly efficient reduction of CO 2 into CH 4 . KEYWORDS: CO 2 RR, Lewis acid, Al 2 O 3 , single-atom Cu catalyst, CH 4

Through deposition of APTES-functionalized Al2O3 particles onto a coarse macroporous support, a new strategy to reduce the pore size and simutaneously promote a high density of heterogeneous nucleation sites was developed, and a continuous and thin ZIF-8 membrane exhibiting remarkably high H2 permeance of 5.73 × 10(-5) mol m(-2) s(-1) Pa(-1) and H2/N2 ideal selectivity of 15.4 was achieved.

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Spare capacity: A SnO2/graphene nanocomposite is fabricated by a novel solvothermal method (see picture). The nanocomposite exhibits a reversible lithium storage capacity of 838 mAh g−1 in the first cycle and improved cyclability as an anode material for lithium‐ion batteries.