Near-infrared absorbing 2D/3D ZnIn2S4/N-doped graphene photocatalyst for highly efficient CO2 capture and photocatalytic reduction

Abstract

Hierarchical heterostructure photocatalysts with broad spectrum solar light utilization, particularly in the nearinfrared (NIR) region, are emerging classes of advanced photocatalytic materials for solar-driven CO 2 conversion into value-added chemical feedstocks. Herein, a novel two-demensional/three-demensional (2D/3D) hierarchical composite is hydrothermally synthesized by assembling vertically-aligned ZnIn 2 S 4 (ZIS) nanowall arrays on nitrogen-doped graphene foams (NGF). The prepared ZIS/NGF composite shows enhancement in photothermal conversion ability and selective CO 2 capture as well as solar-driven CO 2 photoreduction. At 273 K and 1 atm, the ZIS/NGF composite with 1.0 wt% NGF achieves a comparably high CO 2-toN 2 selectivity of 30.1, with an isosteric heat of CO 2 adsorption of 48.2 kJ mol −1. And in the absence of cocatalysts and sacrificial agents, the ZIS/NGF composite with cyclability converts CO 2 into CH 4 , CO and CH 3 OH under simulated solar light illumination, with the respective evolution rates about 9.1, 3.5, and 5.9 times higher than that of the pristine ZIS. In-depth analysis using in-situ irradiated X-ray photoelectron spectroscopy (ISI-XPS) in conjunction with Kelvin probe measurements reveals the underlying charge transfer pathway and process from ZIS to NGF.

Light‐Driven Syngas Production over Defective ZnIn2S4 Nanosheets

“…Inspired by these works, we focus on the ternary metal sulfide ZnIn 2 S 4 in this work, since its narrow band gap enables high response to visible light [16–18] . And the most desirable feature of ZnIn 2 S 4 is its remarkable ability of HER [19, 20] .…”

Graphene‐Based Materials in Planar Perovskite Solar Cells

“…Figure a shows the process of a simple modified Hummers method, which was confirmed by our group to be efficient. [ 77–79 ] GO can be obtained from high‐purity graphite flakes. The process commonly includes treatment of graphite with KMnO 4 and NaNO 3 in concentrated H 2 SO 4 , removal of acid and salts, and centrifugation followed by ultrasonic exfoliation.…”

Design, Fabrication, and Mechanism of Nitrogen‐Doped Graphene‐Based Photocatalyst

“…[ 149 ] For instance, Xia et al. [ 150 ] reported that NG significantly broadened light absorption into the near‐infrared (NIR) region. This condition is conducive to boosting photocatalytic CO 2 reduction efficiency. 6)Prominent photothermal effect: Although it was reported that high temperature was not beneficial to photocatalytic reactions, more and more examples reveal that increased temperature can improve photocatalytic efficiency.…”