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Hierarchical hollow tungsten trioxide spheres (HHTTS) prepared using sacrificial template methods have been used as the support of Pd nanoparticles. The resultant Pd/HHTTS catalyst exhibits low onset potential, a large electrochemical surface area, excellent catalytic activity and stability compared with Pd/C due to the synergistic effect between Pd and HHTTS capable of promoting oxidation of HCOOH directly to CO 2 and the hydrogen spillover effect which greatly accelerates the dehydrogenation of HCOOH on Pd.
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Hu et al. (2014) studied this question.
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