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With the increasing use of fossil fuel,more and more carbon monoxide (CO) was formed as a result of the incomplete combustion.To solve this problem,less expensive supported Pd-based catalysts are often adopted from economic point view.Synthesis of size-,shape-,and composition-controlled Pd-based nanoparticles is of significance to enhance the CO oxidation activity.However,it still remains a challenge for synthesizing Pd-based nanoparticles that have a narrow size-distribution and well controlled composition.