Lead-Free Cs₂TeX₆ (X = Cl, Br, and I) Perovskite Microcrystals with High Stability for Efficient Photocatalytic CO₂ Reduction

Abstract

In response to calling for a sustainable and carbon-neutral economy, the conversion of CO2 to useful chemicals using the solar energy is a potential tactic to relieve the global energy dilemma and environmental issues, which has been a hot topic so far. Recently, the lead halide perovskites as novel photocatalysts have attracted researchers’ interests. However, they generally encounter poor stability and lead toxicity, restricting their large-scale practical applications. Here, the lead-free Cs2TeX6 (X = Cl, Cl0.5Br0.5, Br, Br0.5I0.5, and I) perovskite microcrystals with strong stability were prepared and used to realize the CO2 photocatalytic reduction efficiently. The prepared Cs2TeBr6 microcrystals delivered stronger photocatalytic ability than many previously reported photocatalysts, with the CO and CH4 yields of 308.63 and 60.42 μmolg–1, respectively, under 3 h of illumination. The presented strategy in our work provides new ideas of designing and preparing efficient and practical CO2 reduction photocatalysts based on nonleaded and high-stability halide perovskites.

Lead‐Free Halide Perovskite Photocatalysts for Photocatalytic CO2 Reduction: A Review

“…Huang et al prepared a series of lead‐free perovskite Cs 2 TeX 6 (XCl, Cl 0.5 Br 0.5 , Br, Br 0.5 I 0.5 , and I) photocatalysts by regulating halide elements. [ 118 ] The study of band structure found that they all had suitable band locations for photocatalytic CO 2 reduction. This Cs 2 TeX 6 photocatalyst has good stability.…”

Iontronics in Hybrid Halide Perovskites for Smart Portable Electronic Devices and Their Challenges

“…These 2D IRPPs NSs exhibit superior structural and optical stability along with a strong quantum confinement effect (with tunable absorption and emission in the visible light range), which make them a potential candidate for CO 2 reduction reactions with extraordinary photocatalytic performance and long-term stability. Moreover, 2D MHP nanosheets exhibit extraordinarily improved performance for photocatalytic CO 2 reduction with a maximum electron consumption rate of 87.8 μmol g –1 h –1 among the reported pure MHP catalysts . In addition to the mentioned approaches to improve the intrinsic stability of metal halide perovskites (MHPs), researchers are actively exploring strategies such as surface passivation and stabilizing additives to hinder ion migration and improve the intrinsic stability of metal halide perovskites (MHPs).…”

Lead-free halide perovskites for high-performance thin-film flexible supercapacitor applications

“…Therefore many groups have been synthesizing leadfree halide perovskite for various applications including energy generation and storage. 25,[29][30][31] In this work, we have synthesized three different types of perovskite powder keeping the halide ion the same. Organicinorganic hybrid perovskite such as methylammonium lead trichloride (MAPbCl 3 ), completely inorganic halide perovskite materials such as cesium lead trichloride (CsPbCl 3 ) and a lead-free double perovskite Cs 3 Bi 2 Cl 9 have been studied in this article.…”

“…Therefore many groups have been synthesizing lead-free halide perovskite for various applications including energy generation and storage. 25,29–31…”