Role of composition and texture on bifunctional catalytic performance of extruded AuCu alloys

The catalytic activity of Au 2 Cu and AuCu samples for the electro-oxidation of CH 3 OH and HCOOH, together with their structure and micro-hardness were investigated using various techniques. The addition of Cu can improve the micro-hardness of samples, which is ascribed to the solid solution strengthening effect. The Schmid factor and low angle grain boundary fraction confirm the difference of plastic deformation ability for samples, being consistent with hardness results. The AuCu samples exhibit good bifunctional catalytic performance due to the synergistic effect between Au and Cu. In addition, the Au 2 Cu sample exhibits a higher catalytic activity than the AuCu sample, suggesting that appropriate preferred orientation plays a key role in the improvement of catalytic activities of Au based catalysts. Extruded AuCu alloys can be used as bifunctional catalysts for the electro-oxidation of CH 3 OH and HCOOH, and their catalytic activities can be improved based on alloying and appropriate texture.