Synthesis of a high-performance low-platinum PtAg/C alloyed oxygen reduction catalyst through the gradual reduction method
Synthesis of a high-performance low-platinum PtAg/C alloyed oxygen reduction catalyst through the gradual reduction method
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DOI：
10.1039/c9nj06156h
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发表时间：
2020-03
影响因子：
3.3
通讯作者：
Qing Zhao;Cheng Wang;Haifeng Wang;Jianlong Wang;Yaping Tang;Z. Mao;K. Sasaki
中科院分区：
文献类型：
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作者：
Qing Zhao;Cheng Wang;Haifeng Wang;Jianlong Wang;Yaping Tang;Z. Mao;K. Sasaki
为了减少铂的使用量，提高贵金属在催化氧还原反应中的效率，以Ag为辅助还原剂、载体和牺牲模板，采用逐步还原法制备了低铂PtAg/C催化剂，最终Pt质量分数为10.86wt%。这种合成的低铂PtAg/C催化剂在酸中表现出优异的氧还原反应活性和耐久性。当Pt用量仅为54.77%时，PtAg/C的半波电位比商品Pt/C高28 mV，极限扩散电流密度是Pt/C的1.1倍。此外，其电化学活性表面积是商业Pt/C的2.28倍。此外，其面积比活度和质量比活度分别约为Pt/C的1.85和4.22倍。PtAg/C催化剂在HClO 4中经过10 000次循环后，显示出比商业Pt/C更高的极限电流密度和半波电位，具有优异的ORR性能。 因此，PtAg/C对于酸中的ORR催化更有活性和稳定性。
Herein, to reduce the platinum usage and increase the efficiency of noble metals in the catalysis of the oxygen reduction reaction, Ag was used as an assistant reductant, support and sacrificial template to prepare a low-platinum PtAg/C catalyst through a gradual reduction method with the final Pt mass percentage of 10.86 wt%. This as-synthesized low-platinum PtAg/C catalyst exhibited excellent oxygen reduction reaction activity and durability in an acid. With only 54.77% Pt usage, the half-wave potential of PtAg/C is 28 mV higher than that of commercial Pt/C and its limited diffusion current density is 1.1 times that of Pt/C. Furthermore, its electrochemically active surface area is 2.28 times higher than that of commercial Pt/C. Also, its area-specific activity and mass activity are approximately 1.85 and 4.22 times that of Pt/C, respectively. The PtAg/C catalyst displayed extraordinary ORR performance with higher limited current density and half-wave potential than commercial Pt/C after 10 000 potential cycles in HClO4. Thus, PtAg/C is more active and stable for ORR catalysis in acid.