Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 58, Issue 42, Pages 19486-19494Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b03619
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Funding
- National Natural Science Foundation of China [21776302, 21576289, 21776308]
- Science Foundation of China University of Petroleum, Beijing [2462017BJB04]
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Photoactivated methanol oxidation electrocatalysis attracts broad interest in recent years. Herein, we report the novel reduced graphene oxide encapsulated with a Pd-modified TiO2 nanosphere (PTG) hierarchical composite by the electrostatic assembly strategy. The homodisperse tiny palladium nanoparticles (Pd NPs) on the TiO2 support (Pd/TiO2) ensure more active sites exposed, and graphene encapsulation ensures rapid electron transmission and high light utilization of the PTG material. This tailor-made composite exhibits not only high catalytic activity up to 1052 mA/mg but also good stability due to its distinct hierarchical structure and strong interaction between Pd/TiO2 core and graphene shell. Moreover, detailed characterizations showed that the properties of PTG are related to the particle size and crystal phase of the TiO2 support. The optimal PTG-400-650 (TiO2 support with mixed crystal and particle size of 400 nm) displays 2.0-fold enhancement in catalytic activity under light illumination, which is superior to previously reported TiO2-based photoelectrocatalysts.
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