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Dual Active Sites of Ni‐O‐Ti on NiTiO3 Coated Ni for Efficient and Robust Photothermal CO2 Methanation.

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Title: Dual Active Sites of Ni‐O‐Ti on NiTiO3 Coated Ni for Efficient and Robust Photothermal CO2 Methanation.
Authors: Liu, Chengxin1 (AUTHOR), Kong, Hui1 (AUTHOR), Liu, Minghui1 (AUTHOR), Wang, Xingzhi1 (AUTHOR), Zhao, Lili1 (AUTHOR) ifc_zhaoll@ujn.edu.cn, Liu, Hong1,2 (AUTHOR), Liu, Xiaoyan1 (AUTHOR) ifc_liuxy@ujn.edu.cn, Wang, Shengping3 (AUTHOR) spwang@tju.edu.cn, Zhou, Weijia1 (AUTHOR) ifc_zhouwj@ujn.edu.cn
Source: Advanced Energy Materials. May2026, Vol. 16 Issue 20, p1-10. 10p.
Subject Terms: *Catalytic hydrogenation, *Catalyst structure, *Catalysts, *Catalytic activity, *Nanoparticles
Abstract: Converting CO2 into value‐added fuels using a Ni‐based core–shell catalyst is beneficial for addressing the carbon deposition‐induced deactivation of Ni. However, designing highly active shells is critical. In this study, nickel titanate‐coated metallic Ni nanoparticles (Ni@NiTiO3) are synthesized via laser‐induced nonequilibrium reaction. The obtained Ni@NiTiO3 as a photothermal catalyst for converting CO2 to CH4 achieves a high CH4 yield of 1.48 mol gcat−1 h−1 and CH4 selectivity of 94.3% under the light intensity of 2.52 W cm−2. The outstanding catalytic performance is ascribed to the presence of the Ni‐O‐Ti structure with dual active sites in the shell of Ni@NiTiO3. Specifically, Ni2+ species in the Ni‐O‐Ti structure enhance CO2 adsorption and activation, while Ti species stabilize high‐valent Ni species to maintain activity. Meanwhile, the metallic Ni core reduces the energy barrier for H2 dissociation on the shell surface, thus facilitating the subsequent CO2 hydrogenation. In a flow reactor (weight hourly space velocity of 200 000 mL gcat−1 h−1), Ni@NiTiO3 achieves 77.1% CO2 conversion and maintains long‐term stability for 100 h, which can also be efficiently driven under sunny conditions. This work demonstrates the design concept of core–shell catalyst with a highly active shell prepared via laser‐induced nonequilibrium reactions for efficient photothermal catalytic CO2 hydrogenation reactions. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
Description
Abstract:Converting CO2 into value‐added fuels using a Ni‐based core–shell catalyst is beneficial for addressing the carbon deposition‐induced deactivation of Ni. However, designing highly active shells is critical. In this study, nickel titanate‐coated metallic Ni nanoparticles (Ni@NiTiO3) are synthesized via laser‐induced nonequilibrium reaction. The obtained Ni@NiTiO3 as a photothermal catalyst for converting CO2 to CH4 achieves a high CH4 yield of 1.48 mol gcat−1 h−1 and CH4 selectivity of 94.3% under the light intensity of 2.52 W cm−2. The outstanding catalytic performance is ascribed to the presence of the Ni‐O‐Ti structure with dual active sites in the shell of Ni@NiTiO3. Specifically, Ni2+ species in the Ni‐O‐Ti structure enhance CO2 adsorption and activation, while Ti species stabilize high‐valent Ni species to maintain activity. Meanwhile, the metallic Ni core reduces the energy barrier for H2 dissociation on the shell surface, thus facilitating the subsequent CO2 hydrogenation. In a flow reactor (weight hourly space velocity of 200 000 mL gcat−1 h−1), Ni@NiTiO3 achieves 77.1% CO2 conversion and maintains long‐term stability for 100 h, which can also be efficiently driven under sunny conditions. This work demonstrates the design concept of core–shell catalyst with a highly active shell prepared via laser‐induced nonequilibrium reactions for efficient photothermal catalytic CO2 hydrogenation reactions. [ABSTRACT FROM AUTHOR]
ISSN:16146832
DOI:10.1002/aenm.70870