Synthesis of 3D graphite oxide-exfoliated carbon nanotube carbon composite and its application as catalyst support for fuel cells
Synthesis of 3D graphite oxide-exfoliated carbon nanotube carbon composite and its application as catalyst support for fuel cells
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DOI：
10.1016/j.jpowsour.2014.03.014
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发表时间：
2014-08
影响因子：
9.2
通讯作者：
Hailin Wang;B. Kakade;Takanori Tamaki;Takeo Yamaguchi
中科院分区：
文献类型：
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作者：
Hailin Wang;B. Kakade;Takanori Tamaki;Takeo Yamaguchi
石墨烯或还原氧化石墨（r-GO）的重新堆叠通常被认为是潜在应用的严重障碍。我们提出了剥离的碳纳米管（e-CNT）作为一个有效的碳间隔制造一个类似的三维（3D）碳复合材料与GO的应用。通过在水性分散体中均匀混合GO和e-CNT成功地制备了GO + e-CNT的3D碳组合，其中碳间隔物均匀地插入石墨烯层。通过添加碳间隔物，与热还原后的r-GO（17.2m2g-1）相比，3D碳的BET表面积（51.6m2g-1）增加了三倍。此外，3D GO + e-CNT负载的PtPd催化剂（PtPd-GO + e-CNT）显示出尺寸为3.9 ± 0.6 nm的PtPd纳米颗粒的均匀分布，具有164 m2 g − 1的扩大的电化学活性表面积（ECSA）值和690 mA mg− 1的对于甲醇氧化反应（莫尔）的质量活性，该甲醇氧化反应是直接甲醇燃料电池（DMFC）的典型阳极反应。
The restacking of graphene or reduced graphite oxide (r-GO) is commonly regarded as a severe obstacle for potential applications. We propose the application of exfoliated carbon nanotube (e-CNT) as an effective carbon spacer for fabricating a sandwich-like three-dimensional (3D) carbon composite with GO. The 3D carbon combination of GO + e-CNT is successfully prepared via homogenously mixing of GO and e-CNT in an aqueous dispersion in which carbon spacers are homogenously intercalated with graphene layers. With the addition of a carbon spacer, the BET surface area of 3D carbon (51.6 m2g−1) is enhanced by a factor of three compared with r-GO (17.2 m2g−1) after thermal reduction. In addition, the 3D GO + e-CNT supported PtPd catalyst (PtPd-GO + e-CNT) shows homogenous distribution of PtPd nanoparticles of 3.9 ± 0.6 nm in size, with an enlarged electrochemical active surface area (ECSA) value of 164 m2g−1and a mass activity of 690 mA mg−1toward the methanol oxidation reaction (MOR), which is the typical anode reaction for direct methanol fuel cells (DMFC).