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Bimetallic Hollow Nanostructures for the Oxygen Reduction Reaction 1 2 Meng Wang , Jiazhao Wang , Weimin 1

3 Zhang,

2 1 Hua K. Liu , and Jun Chen

ARC Centre of Excellence for Electroactive Materials, Intelligent Polymer Research Institute, University of Wollongong, Wollongong,  NSW, Australia. 2 Institute for Superconducting and Electronic Material (ISEM), University of Wollongong, Wollongong, NSW, Australia 3. Shanghai Sinopoly Batteries Research Institute, Shanghai, 200241, China Email: mw088@uow.edu.au

INTRODUCTION

2. Electrochemical Characterisations

The oxygen reduction reaction (ORR) is recognized as the kinetically limited step in fuel cell and metal-air batteries due to its sluggish reaction mechanism.1-2 Despite having high efficiency in electro-catalyze oxygen, platinum (Pt) or palladium (Pd) electrocatalysts is inhibited from large production due to the high cost, low durability and poison resistance.1-2 When alloying Pt/Pd with second metals, the electrocatalytic performance and durablities would be enhanced while the cost would be reduced. Meanwhile hollow nanoparticles received lots of interests because of their high surface area, low density and high catalyst utilization efficiency

Three electrode system test

single fuel cell test

compared to their solid counterparts. Therefore, in order to obtain the advantages of nanoparticles with both hollow and bimetallic features, much effort has been focused on the investigation of Pt–TM alloyed hollow nanospheres. We herein report a series of hollow bimetallic nanostructures synthesized via galvanic replace method, named Pt-Pd,3 Pt-Cu,4 Pd-Ni5 nanostructures with porous features. These hollow porous nanoparticles showed superior electrocatalytic performance towards the ORR as well as better durablities).

Results and Discussions 1. Morphologies Characterisations

Figure 2. Electrochemical properties of a) the Pt-Pd , b) Pt-Cu, c) Pd-Ni hollow nanoparticles. Left: ORR polarisation curves; Right: Single fuel cell tests.

Conclusion Bimetallic hollow nanoparticles were synthesized via a modified galvanic replacement method with an average size of 25 nm and a shell thickness of 5 nm. Electrochemical tests have revealed that these hollow nanoparticles are superior ORR catalysts when compared to commercial Pt/C or Pd/C. Moreover, practical fuel cell tests have revealed these catalysts, with much lower cost, could work as more efficient catalysts than commercial Pt/C under real operating conditions.

REFERENCES

Figure 1. TEM images of a) the Pt-Pd , b) Pt-Cu, c) Pd-Ni hollow nanoparticles and their corresponding EDS line scan profiles (right)

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1. Lim, B.; Jiang, M.; Camargo, P. H. C.; Cho, E. C.; Tao, J.; Lu, X.; Zhu, Y.; Xia, Y., Science 2009, 324, 1302-1305. 2. Joo, S. H.; Choi, S. J.; Oh, I.; Kwak, J.; Liu, Z.; Terasaki, O.; Ryoo, R., Nature 2001, 412, 169-172. 3. Zhang, W.; Wang, M.; Chen, J.; Romeo, T.; Harris, A. T.; Minett, A. I., Electrochem. Commun. 2013, 34, 73-76. 4. Wang, M.; Zhang, W.; Wang, J.; Minett, A.; Lo, V.; Liu, H.; Chen, J., J. Mater. Chem. A 2013, 1, 2391-2394. 5. Wang, M.; Zhang, W.; Wang, J.-Z.; Wexler, D.; Poynton, S. D.; Slade, R. C. T.; KunLiu, H.; Winther-Jenson, B.; Kerr, R.; Shi, D.; Chen, J., ACS Appl. Mater. Interfaces 2013, 5, 12708-12715.

Meng wang  
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