Journal
GREEN CHEMISTRY
Volume 17, Issue 3, Pages 1572-1580Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4gc02052a
Keywords
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Funding
- Department of Science and Technology (DST), Government of India [SR/S1/PC-28/2011]
- University Grants Commission (UGC)
- Council of Scientific and Industrial Research (CSIR), New Delhi
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The effects of the confinement of Pd nanoparticles (NPs) inside hollow carbon matrices are evaluated based on their performance in methanol (MeOH) electro-oxidation (EOx). The performance of three catalyst systems were compared: (1) Pd NPs exclusively confined inside the hollow carbon NPs, (2) Pd NPs distributed between the pores and the surface of porous carbon and (3) Pd NPs bound to the surface of activated charcoal. When NPs are exclusively confined, the electrocatalytic activity improves due to the higher proximity of the NPs to the reactants inside the cavity and minimal leaching of the NPs over 300 cycles. NP confinement yields a high anodic peak current density (AP-CD) of 142 mA cm(-2) (626 cm(2) mg(Pd)(-1)) at a lower anodic potential of -0.3 V and an excellent re-usability, as compared to the partially confined and exposed NPs. A minimal loading of 1.2-2.5 wt% Pd NPs inside the mesoporous carbon resulted in a high electrochemically active surface area (ECSA), which clearly underlines the positive effect of the confinement of metal NPs.
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