Self-Photocatalytic Splitting of Carbon Dioxide Using Co-Cationic Perovskite Nanocrystals in Absence of Water

Retarded Charge Recombination to Enhance Photocatalytic Performance for Water-Free CO2 Reduction Using Perovskite Nanocrystals as Photocatalysts

“…The red shift of the PB band to longer wavelengths can be understood in terms of increase of particle size for nanocrystals as reported elsewhere . These results are consistent with our previous results for the TEM images showing the aggregated nanocrystals with larger sizes, the XRD patterns showing the sharper diffraction peaks, and the TCSPC transients (Figure ) showing the greater PL lifetimes after light irradiation, due to the effect of Ostwald ripening and possibly the enhanced contribution of cubic phase discussed elsewhere . Furthermore, we notice that both photoactivated samples of CS and CF show red tails of the PB bands which greatly extended to the 600 nm region, while the PB bands are nearly symmetrical for both pristine samples of CS and CF.…”

“…Figure S1 shows that both PeNCs are cubic and highly crystalline with average nanocrystal size of ∼8 nm. In addition, XRD and TOPAS results show that both PeNCs have mixed cubic and orthorhombic phases with varied proportions: the CF PeNC comprises 7% cubic and 93% orthorhombic phases whereas the CS PeNC has 38% cubic and 62% orthorhombic phases . After CO 2 reduction for 12 h, both catalysts show enhancement in the cubic phase from 38% to 73% for CS and 7% to 47% for CF .…”

“…In the present study, we developed a noncubic PeNC by incorporating FA cation into the reference CS PeNC nanocrystal to form a cocationic PeNC, Cs 1– x FA x PbBr 3 (CF, x = 0.45 determined by SEM/EDX data), synthesized using the hot addition method (HAM) developed by ourself. , We found that the CO product yield of photocatalytic CO 2 reduction using CF as a catalyst is three times greater than that using CS as a catalyst in the absence of water …”

“…In addition, XRD and TOPAS results show that both PeNCs have mixed cubic and orthorhombic phases with varied proportions: the CF PeNC comprises 7% cubic and 93% orthorhombic phases whereas the CS PeNC has 38% cubic and 62% orthorhombic phases . After CO 2 reduction for 12 h, both catalysts show enhancement in the cubic phase from 38% to 73% for CS and 7% to 47% for CF . Note that the CF catalyst contains more portions of orthorhombic phase than the CS catalyst, implying that the former may have more spaces than CS to adsorb more CO 2 molecules on the crystal surface to enhance its photocatalytic performance.…”

“…A solar simulator with power 1000 W m –2 (one sun) was used as the light source to irradiate the samples for 12 h and the CO and methane products were analyzed using the GC-TCD and GC-FID systems, respectively. The product yields of CO for CF and CS were obtained to be 1.105 ± 0.083 vs 0.349 ± 0.036 μmol g –1 , respectively, indicating the significantly improved photocatalytic performance for the CF photocatalyst with addition of FA to serve with additional proton source for the CO 2 reduction rate to accelerate.…”