TY - JOUR

T1 - Hydrothermally Synthesized ZnCr- and NiCr-Layered Double Hydroxides as Hydrogen Evolution Photocatalysts

AU - Kurnosenko, S.A.

AU - Silyukov, O.I.

AU - Rodionov, I.A.

AU - Baeva, A.S.

AU - Burov, A.A.

AU - Kulagina, A.V.

AU - Novikov, S.S.

AU - Zvereva, I.

N1 - Kurnosenko, S.A.; Silyukov, O.I.; Rodionov, I.A.; Baeva, A.S.; Burov, A.A.; Kulagina, A.V.; Novikov, S.S.; Zvereva, I.A. Hydrothermally Synthesized ZnCr- and NiCr-Layered Double Hydroxides as Hydrogen Evolution Photocatalysts. Molecules 2024, 29, 2108.

PY - 2024/5/2

Y1 - 2024/5/2

N2 - The layered double hydroxides (LDHs) of transition metals are of great interest as building blocks for the creation of composite photocatalytic materials for hydrogen production, environmental remediation and other applications. However, the synthesis of most LDHs is reported only by the conventional coprecipitation method, which makes it difficult to control the catalyst's crystallinity. In the present study, ZnCr- and NiCr-LDHs have been successfully prepared using a facile hydrothermal approach. Varying the hydrothermal synthesis conditions allowed us to obtain target products with a controllable crystallite size in the range of 2-26 nm and a specific surface area of 45-83 m 2∙g -1. The LDHs synthesized were investigated as photocatalysts of hydrogen generation from aqueous methanol. It was revealed that the photocatalytic activity of ZnCr-LDH samples grows monotonically with the increase in their average crystallite size, while that of NiCr-LDH ones reaches a maximum with intermediate-sized crystallites and then decreases due to the specific surface area reduction. The concentration dependence of the hydrogen evolution activity is generally consistent with the standard Langmuir-Hinshelwood model for heterogeneous catalysis. At a methanol content of 50 mol. %, the rate of hydrogen generation over ZnCr- and NiCr-LDHs reaches 88 and 41 μmol∙h -1∙g -1, respectively. The hydrothermally synthesized LDHs with enhanced crystallinity may be of interest for further fabrication of their nanosheets being promising components of new composite photocatalysts.

AB - The layered double hydroxides (LDHs) of transition metals are of great interest as building blocks for the creation of composite photocatalytic materials for hydrogen production, environmental remediation and other applications. However, the synthesis of most LDHs is reported only by the conventional coprecipitation method, which makes it difficult to control the catalyst's crystallinity. In the present study, ZnCr- and NiCr-LDHs have been successfully prepared using a facile hydrothermal approach. Varying the hydrothermal synthesis conditions allowed us to obtain target products with a controllable crystallite size in the range of 2-26 nm and a specific surface area of 45-83 m 2∙g -1. The LDHs synthesized were investigated as photocatalysts of hydrogen generation from aqueous methanol. It was revealed that the photocatalytic activity of ZnCr-LDH samples grows monotonically with the increase in their average crystallite size, while that of NiCr-LDH ones reaches a maximum with intermediate-sized crystallites and then decreases due to the specific surface area reduction. The concentration dependence of the hydrogen evolution activity is generally consistent with the standard Langmuir-Hinshelwood model for heterogeneous catalysis. At a methanol content of 50 mol. %, the rate of hydrogen generation over ZnCr- and NiCr-LDHs reaches 88 and 41 μmol∙h -1∙g -1, respectively. The hydrothermally synthesized LDHs with enhanced crystallinity may be of interest for further fabrication of their nanosheets being promising components of new composite photocatalysts.

KW - слоистый гидроксид; гидротермальный синтез; размер кристаллитов; фотокатализ; водород; Кинетика Ленгмюра–Хиншелвуда

KW - layered hydroxide; hydrothermal synthesis; crystallite size; photocatalysis; hydrogen; Langmuir–Hinshelwood kinetics

KW - hydrothermal synthesis

KW - Langmuir–Hinshelwood kinetics

KW - hydrogen

KW - layered hydroxide

KW - photocatalysis

KW - crystallite size

UR - https://www.mendeley.com/catalogue/2af374cf-5d40-3c0a-83f9-4b47643f6d60/

U2 - 10.3390/molecules29092108

DO - 10.3390/molecules29092108

M3 - Article

C2 - 38731599

VL - 29

JO - Molecules

JF - Molecules

SN - 1420-3049

IS - 9

M1 - 2108

ER -