纳米多孔Pd-Cu/Pd-Ag催化剂的制备及其电催化性能EI北大核心CSCD

针对直接甲醇燃料电池(direct methanol fuel cell,DMFE)对高效阳极催化剂的需求,设计研发Ca-Mg-Pd-M(M=Cu,Ag)非晶合金前躯体体系,并采用去合金化制备系带-孔道双连续结构的纳米多孔Pd-Cu/Pd-Ag合金。通过设计前驱体合金比例可调节多孔结构的元素比例和尺寸,Pd元素可与Cu,Ag元素形成连续固溶体,在去合金化过程中可以降低Cu,Ag元素的扩散,进而细化纳米多孔的系带尺寸(由100 nm减小到10 nm)。相较于纳米多孔Pd,纳米多孔Pd-Cu/Pd-Ag合金表现出更优异的甲醇催化活性(催化电流强度:45 mA/mg)和抗毒化能力(J f/J b值为1.56),还具有低成本的优点,在直接甲醇燃料电池阳极催化剂方面有着良好的应用前景。

Synthesis and catalytic performance of nanoporousPd-Cu/Pd-Ag catalyzer

In view of the imperious demand for efficient anode catalyst in direct methanol fuel cell(DMFE),Ca-Mg-Pd-M(M=Cu,Ag)metallic glasses were designed and synthesized as precursors to prepare nanoporous Pd-Cu/Pd-Ag alloys with ligament-pore bicontinuous structure through dealloying in this paper.The proportion of elements as well as the ligament size of nanoporous metals can be adjusted by changing the composition of presurors.Pd elements can form continuous solid solution with Cu and Ag in a wide range,which can reduce the diffusion rate of Cu and Ag elements in solution,and refine the ligament size of nanoporous metals dramatically(from 100 nm to 10 nm).Moreover,catalytic performance of nanoporous Pd-Cu/Pd-Ag alloys in methanol electro-oxidation was investigated.Compared to nanoporous Pd,nanoporous Pd-Cu/Pd-Ag alloys exhibit more excellent catalytic activity and anti-poisoning effect.The electric current density of nanoporous Pd-Cu alloy can reach 45 mA/mg,and the ratio of J f/J b is 1.56.As a result,the nanoporous Pd-Cu/Pd-Ag alloys with lower cost has favorable application prospect in DMFE.