We report an effective strategy to enhance CO 2 electroreduction (CER) properties of Cu-based Ruddlesden-Popper (RP) perovskiteo xides by engineering their A-site cation deficiencies.W ith La 2Àx CuO 4-d (L 2Àx C, x = 0, 0.1, 0.2, and 0.3) as proof-of-concept catalysts,w ed emonstrate that their CER activity and selectivity (to C 2+ or CH 4 )s howe ither avolcano-type or an inverted volcano-type dependence on the xv alues,w ith the extreme point at x = 0.1. Among them, at À1.4 V, the L 1.9 Cd elivers the optimal activity (51.3 mA cm À2 ) and selectivity (41.5 %) for C 2+ ,c omparable to or better than those of most reported Cu-based oxides,w hile the L 1.7 C exhibits the best activity (25.1 mA cm À2 )a nd selectivity (22.1 %) for CH 4 .S uch optimizedC ER properties could be ascribed to the favorable merits brought by the cationdeficiency-induced oxygen vacancies and/or CuO/RP hybrids, including the facilitated adsorption/activation of key reaction species and thus the manipulated reaction pathways.

No abstract

Dendronized polydiacetylenes showing thermoresponsiveness were fabricated via photopolymerization of assembled ribbons from amphiphilic dendronized diacetylene in aqueous solutions, which simultaneously showed thermally switchable chiralities.

No abstract