Microspheres assembled by KMn8O16 nanorods and their catalytic oxygen reduction activity in direct methanol fuel cells
Microspheres assembled by KMn8O16 nanorods and their catalytic oxygen reduction activity in direct methanol fuel cells
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DOI：
10.1016/j.jpowsour.2014.04.085
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发表时间：
2014-12-01
影响因子：
9.2
通讯作者：
Liu, Yongning
中科院分区：
文献类型：
--
作者：
Fang, Yuan;Yang, Xiaodong;Liu, Yongning
通过一种简单的无模板一步水热技术合成了由隐钾矿型KMn 8 O 16纳米棒组装的微球。合成的KMn_8 O_（16）生成直径为10 - 20 nm、长约300-1000 nm的纳米棒。棒自组装形成直径为2-6 μ m的微球。ORR期间KMn 8 O 16的电子转移数在0.5 V vs. Hg/HgO下约为3.98，H2 O2百分比为0.66%。此外，直接甲醇燃料电池（DMFC）的构建使用KMn 8 O 16作为阴极催化剂，PtRu/C合金作为阳极催化剂和聚合物纤维膜（PFM）代替传统的聚合物电解质膜（PEM）。在25 ℃和70 ℃下分别获得了峰值功率密度（43.3 mW cm（-2）和153.9 mW cm（-2））。KMn_8 O_（16）在碱性溶液中对氧还原具有良好的电催化活性和稳定性，并表现出对甲醇中毒的耐受性。(C)2014爱思唯尔有限公司版权所有。
Microspheres assembled using cryptomelane-type KMn8O16 nanorods are synthesized via a facile template-free, single-step hydrothermal technique. The synthesized KMn8O16 generates nanorods 10 -20 nm in diameter and approximately 300-1000 nm long. The rods self-assemble to form microspheres of 2-6 mu m in diameters. The electron transfer number for KMn8O16 during the ORR is approximately 3.98 at 0.5 V vs. Hg/HgO, and the H2O2 percentage is 0.66%. Moreover, a direct methanol fuel cell (DMFC) is built using KMn8O16 as cathodic catalyst, PtRu/C alloy as the anodic catalyst and a polymer fiber membrane (PFM) instead of a conventional polymer electrolyte membrane (PEM). The peak power densities (43.3 mW cm(-2) and 153.9 mW cm(-2)) have been achieved at 25 degrees C and 70 degrees C, respectively. KMn8O16 shows good electrocatalytic activity and stability during oxygen reduction in alkaline solutions and demonstrates tolerance toward methanol poisoning. (C) 2014 Elsevier B.V. All rights reserved.