Highly Selective Photocatalytic Conversion of Carbon Dioxide by Water over Al-SrTiO₃ Photocatalyst Modified with Silver–Metal Dual Cocatalysts

Abstract

In this study, an anisotropic facet-exposed Al-SrTiO 3 photocatalyst modified with various Ag−metal (Fe, Co, Ni, and Pt) dual cocatalysts was investigated to elucidate the functions of the Ag and metals in the photocatalytic conversion of CO 2 by H 2 O. The various dual cocatalysts were loaded on the surface of Al-SrTiO 3 using a simultaneous photodeposition method. In particular, the modification of the FeOOH and metallic Ag cocatalysts on the surface of the Al-SrTiO 3 photocatalyst markedly enhanced the CO formation rate (38.2 μmol h −1 ), with extremely high selectivity toward CO evolution (99.3%), during the photocatalytic conversion of CO 2 by H 2 O under a relatively long light wavelength (λ ≥ 300 nm). In addition, the metallic Ag and FeOOH dual cocatalysts present on the surface of Al-SrTiO 3 were durable and stable during the photoirradiated reaction, wherein the Ag and Fe deposited on the {100} and {110} facets functioned as active sites for the reduction of CO 2 and oxidation of H 2 O, respectively.

SrTiO3@NiFe LDH core–shell composites for photocatalytic CO2 conversion

“…[20][21][22][23][24] The photocatalysis efficiency were roughly compared by CO yield. STONF 2 showed higher photocatalytic performance than reported CoAl LDH, MgAl LDH, ZnCr LDH, NiAl LDH, NiFe LDH, SrTiO 3 based photocatalysts, [25][26][27][28][29][30][31][32][33][34][35][36][37][38] as summarized in Table S1. †…”

Promoting Photocatalytic Carbon Dioxide Reduction by Tuning the Properties of Cocatalysts

“…It is expected that the carrier lifetimes of various photocatalysts will be elucidated by fluorescence lifetime measurements, TA spectroscopy, [43] and time‐resolved microwave spectroscopy, [44] and that photocatalysts and cocatalysts with high charge separation efficiency will be designed and developed based on the knowledge obtained [26ba,45] Previous studies have demonstrated that the catalytic activity can be enhanced when cocatalysts are loaded on suitable crystal facets for the reduction and oxidation reactions [28c,30n,o,46] . Therefore, it is expected that CRR photocatalysts with improved activity and selectivity will be developed in the future by establishing methods to selectively load cocatalysts that have size, alloy structures, crystal facets, and shell structures suitable for achieving high activity and selectivity on the crystal facets of the photocatalysts where CRR occurs. It is expected that the geometric structure of highly active and selective cocatalysts will be revealed at the atomic level by aberration‐corrected TEM and STEM [47] measurements, thereby providing a clearer understanding of the effect of surface structure on catalytic activity. Atomically precise metal nanoclusters (NCs), [48] whose geometric/electronic structures have been revealed by single‐crystal X‐ray structural analysis and DFT calculations have been reported to be highly active cocatalysts for photocatalytic water‐splitting reaction and other catalytic reactions.…”

Cu Nanoparticles Modified Step-Scheme Cu2O/WO3 Heterojunction Nanoflakes for Visible-Light-Driven Conversion of CO2 to CH4

“…The influence of the specific surface structure of the photocatalyst cannot be ignored in the process of CO 2 reduction [34,35]. Due to the eight-electron reaction of CH 4 generation from CO 2 , loading co-catalysts with fast electron transfer, including Au, Pt, Ag and Ti, could be conductive to control the reduction of products [35][36][37][38]. Non-noble-metal Cu co-catalyst has become a newly emerging research spot for CO 2 reduction.…”