Electrochemical carbon dioxide (CO 2 )r eduction reaction (CO 2 RR) is an attractive approach to deal with the emission of CO 2 and to produce valuable fuels and chemicals in ac arbon-neutral way.M any efforts have been devoted to boost the activity and selectivity of high-value multicarbon products (C 2+ )o nC u-based electrocatalysts.H owever,C ubased CO 2 RR electrocatalysts suffer from poor catalytic stability mainly due to the structural degradation and loss of active species under CO 2 RR condition. To date,most reported Cu-based electrocatalysts present stabilities over dozenso f hours,w hich limits the advance of Cu-based electrocatalysts for CO 2 RR. Herein, ap orous chlorine-doped Cu electrocatalyst exhibits high C 2+ Faradaic efficiency (FE) of 53.8 %at À1.00 Vv ersus reversible hydrogen electrode (V RHE ). Importantly,the catalyst exhibited an outstanding catalytic stability in long-term electrocatalysis over 240 h. Experimental results show that the chlorine-induced stable cationic Cu 0 /Cu + species and the well-preserved structure with abundant active sites are critical to the high FE of C 2+ in the long-term run of electrochemical CO 2 reduction.

The first low-dimensional semiconductor nanocrystal system that increases the photoluminescence quantum yield in aggregates.

No abstract

The phosphorescent emitters are essential to realize energy-efficient display and lighting panels. The solution processability is of particular interest for large-scale and low-cost production. Here, we present a series of the heteroleptic iridium (Ir) complexes, Ir(ppy)L1, Ir(ppy)L2, and Ir(ppy)L3, using the new ancillary ligands, including 1-(2-chlorophenyl)-5-hydroxy-3-methyl-1H-pyrazole-4-carbaldehyde (L1), 5-hydroxy-3-methyl-1-(p-tolyl)-1H-pyrazole-4-carbaldehyde (L2), and 5-hydroxy-3-methyl-1-phenyl-1H-pyrazole-4-carbaldehyde (L3). Their photophysical and electrochemical properties were systematically characterized, followed by comparing with those predicted by density functional theory simulations using hybrid functionals. Among the three phosphors synthesized, Ir(ppy)L1 exhibits the highest photoluminescence quantum yield (Φ = 89%), with an exciton lifetime of 0.34 μs. By using 4,4'-bis(carbazole-9-yl)biphenyl as the host material, we demonstrate high current efficiencies of 64 and 40 cd A at 100 cd m in its vacuum-evaporated and solution-processed organic light-emitting devices, respectively, revealing the promise for large-area light sources.

Electrochemical carbon dioxide (CO 2 )r eduction reaction (CO 2 RR) is an attractive approach to deal with the emission of CO 2 and to produce valuable fuels and chemicals in ac arbon-neutral way.M any efforts have been devoted to boost the activity and selectivity of high-value multicarbon products (C 2+ )o nC u-based electrocatalysts.H owever,C ubased CO 2 RR electrocatalysts suffer from poor catalytic stability mainly due to the structural degradation and loss of active species under CO 2 RR condition. To date,most reported Cu-based electrocatalysts present stabilities over dozenso f hours,w hich limits the advance of Cu-based electrocatalysts for CO 2 RR. Herein, ap orous chlorine-doped Cu electrocatalyst exhibits high C 2+ Faradaic efficiency (FE) of 53.8 %at À1.00 Vv ersus reversible hydrogen electrode (V RHE ). Importantly,the catalyst exhibited an outstanding catalytic stability in long-term electrocatalysis over 240 h. Experimental results show that the chlorine-induced stable cationic Cu 0 /Cu + species and the well-preserved structure with abundant active sites are critical to the high FE of C 2+ in the long-term run of electrochemical CO 2 reduction.