Ultrastable Lead-Free CsAgCl₂ Perovskite Microcrystals for Photocatalytic CO₂ Reduction

Abstract

Nowadays, there is much attention focusing on lead halide perovskite because of its admirable performances in optoelectronic applications. However, the notorious toxicity and long-term instability are two main factors limiting its widespread applications. The findings of this work demonstrate a facile synthesis process for novel lead-free CsAgCl 2 perovskite microcrystals with no organic ligand involved. The fundamental properties of the CsAgCl 2 microcrystals are revealed by applying temperature-dependent X-ray diffraction and photoluminescence measurements from 77 to 300 K. Furthermore, the CsAgCl 2 microcrystals exhibit excellent air (60 days), thermal (100 °C), and light stability. Meanwhile, the CsAgCl 2 microcrystals have shown exciting potential applications in the fields of photocatalysis and photoelectrochemistry.

Tailoring Inorganic Halide Perovskite Photocatalysts toward Carbon Dioxide Reduction

“…And the surface Br active site can change the CO 2 adsorption and activation modes. As shown in Figure 6a, the CO yield of Cs 3 Bi 2 Br 9 is 134.76 μmol g À1 with 98.7% selectivity in mixed CO 2 and H 2 O vapor under AM1.5G simulated solar irradiation for 5 h. Leadfree CsAgCl 2 microcrystals (Figure 6b,c) were also synthesized by Wu et al, with the CO yield of 35.28 μmol g À1 in CO 2 after 5 h irradiation with the long-term stability in the air for over 2 months, under 100 C heating in the air for 100 h or under UV lamp irradiation for 100 h. [54] The combination of trap-state control and facet control for PVKs is another effective strategy for producing better photocatalysts. Different facets of CsPbBr 3 nanocrystals with the shape of noncubic, hexapod, and cubic were investigated by Shyamal et al, as shown in Figure 6d.…”

“…And the surface Br active site can change the CO 2 adsorption and activation modes. As shown in Figure a, the CO yield of Cs 3 Bi 2 Br 9 is 134.76 μmol g −1 with 98.7% selectivity in mixed CO 2 and H 2 O vapor under AM1.5G simulated solar irradiation for 5 h. Lead‐free CsAgCl 2 microcrystals (Figure 6b,c) were also synthesized by Wu et al, with the CO yield of 35.28 μmol g −1 in CO 2 after 5 h irradiation with the long‐term stability in the air for over 2 months, under 100 °C heating in the air for 100 h or under UV lamp irradiation for 100 h. [ 54 ]…”

“…Adapted with permission. [ 54 ] Copyright 2021, American Chemical Society. c) CO 2 RR performance of CsAgCl 2 microcrystals.…”

“…Adapted with permission. [ 54 ] Copyright 2021, American Chemical Society. d) Crystal structure models of polyhedron‐shaped noncubes, hexapods, and cube‐shaped CsPbBr 3 nanostructures and e) their CO 2 RR yield.…”

“…c) CO 2 RR performance of CsAgCl 2 microcrystals. Adapted with permission [54]. Copyright 2021, American Chemical Society.…”