Ultrahigh oxygen reduction activity of Pt/nitrogen-doped porous carbon microspheres prepared via spray-drying
Ultrahigh oxygen reduction activity of Pt/nitrogen-doped porous carbon microspheres prepared via spray-drying
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DOI：
10.1016/j.jpowsour.2012.11.143
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发表时间：
2013-05
影响因子：
9.2
通讯作者：
R. Balgis;G. Anilkumar;S. Sago;T. Ogi;K. Okuyama
中科院分区：
文献类型：
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作者：
R. Balgis;G. Anilkumar;S. Sago;T. Ogi;K. Okuyama
通过原位喷雾干燥技术和煅烧合成了负载在氮掺杂多孔碳微球（Pt/CN）上的 Pt 纳米颗粒。氢氧化铵的添加对溶液化学有显着影响，促进了碳载体材料上金属Pt和氮掺杂的同时形成。此外，前体pH值影响产物随后的氧还原活性。在前体 pH 值为 8.4 时制备的催化剂记录了超高氧还原反应 (ORR) 活性，质量活性和比活性分别为 564 mA mg−1Pt 和 834 μA cm−2Pt。这项研究得出了在有限的催化剂表面积增强期间提高催化剂 ORR 的有效策略。
Pt nanoparticles supported on nitrogen-doped porous carbon microspheres (Pt/CN) were synthesized via an in-situ spray-drying technique followed by calcination. The addition of ammonium hydroxide had a remarkable influence on the solution chemistry, which promoted the simultaneous formation of metallic Pt and nitrogen doping onto carbon support material. Furthermore, the precursor pH influenced the subsequent oxygen reduction activity of the product. Ultrahigh oxygen reduction reaction (ORR) activity was recorded for a catalyst prepared at a precursor pH of 8.4 with mass activity and specific activity were 564 mA mg−1Pt and 834 μA cm−2Pt, respectively. This investigation resulted in an effective strategy to escalate the catalyst ORR during limited catalyst surface area enhancement.