A hybrid catalyst of Pt/CoNiO2 on carbon nanotubes and its synergetic effect towards remarkable ethanol electro-oxidation in alkaline media†,Sustainable Energy & Fuels

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A hybrid catalyst of Pt/CoNiO2 on carbon nanotubes and its synergetic effect towards remarkable ethanol electro-oxidation in alkaline media†
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2017-10-25 00:00:00 , DOI: 10.1039/c7se00392g
Tingting Tang _{1,

2,

3,

4,

5} , Qiuping Gan _{1,

2,

3,

4,

5} , Xiaohui Guo _{1,

2,

3,

4,

5} , Hailin Dong _{6,

7,

8,

9} , Jifang Zhang _{1,

2,

3,

4,

5} , Yanchun Zhao _{1,

2,

3,

4,

5} , Jianniao Tian _{1,

2,

3,

4,

5} , Xiulin Yang _{1,

2,

3,

4,

5}

Affiliation

Herein, a hybrid catalyst of Pt/CoNiO₂ on carbon nanotubes (Pt/CoNiO₂–CNTs) has been successfully synthesized by a facile and cost-effective method, and its crystal structures, chemical valence states, and morphologies have been characterized in detail. CO stripping voltammograms reveal that the adsorbed CO_ads on the active sites of the Pt/CoNiO₂–CNT catalyst is easily oxidized at a lower potential (−0.60 V) as compared to the Pt particles on rGO (−0.35 V) and acid-treated CNTs (−0.36 V). Cyclic voltammograms demonstrate that the designed Pt/CoNiO₂–CNT catalyst possesses an ultrahigh electrocatalytic activity (1136.2 mA mg_Pt⁻¹) for ethanol oxidation, which is 5.1 and 3.0 times higher than that of Pt/rGO (221.6 mA mg_Pt⁻¹) and Pt/CNTs (375.4 mA mg_Pt⁻¹), respectively. The Tafel plot of Pt/CoNiO₂–CNTs is 205 mV dec⁻¹, indicating much faster reaction kinetics than that of the compared catalysts. In addition, the outstanding long-term stability indicates that the designed Pt/CoNiO₂–CNT catalyst exhibits expected application prospects in direct alkaline ethanol fuel cells. Moreover, the catalytic mechanism of the hybrid Pt/CoNiO₂–CNTs has been proposed and discussed via C2 and C1 pathways with respect to the final products for CH₃COO⁻ and CO₃²⁻, respectively.

中文翻译：

碳纳米管上 Pt / CoNiO _2的杂化催化剂及其在碱性介质中对显着乙醇电氧化的协同作用†

在此，已通过一种简便且经济高效的方法成功地合成了碳纳米管上的Pt / CoNiO ₂杂化催化剂（Pt / CoNiO ₂ -CNTs），并详细表征了其晶体结构，化学价态和形态。。CO剥离伏安表明被吸附的CO_的广告在Pt / CoNiO的活性位点₂ -CNT催化剂在相比于上RGO（-0.35 V）和酸的Pt粒子低的电势（-0.60 V）容易氧化处理的CNT（-0.36 V）。循环伏安图表明，设计的Pt / CoNiO ₂ -CNT催化剂具有超高的电催化活性（1136.2 mA mg _Pt^-1）进行乙醇氧化，分别是Pt / rGO（221.6 mA mg _Pt^-1）和Pt / CNTs（375.4 mA mg _Pt^-1）的5.1和3.0倍。Pt / CoNiO ₂ -CNTs的Tafel图为205 mV dec ^-1，表明反应动力学比比较的催化剂快得多。此外，出色的长期稳定性表明，设计的Pt / CoNiO ₂ -CNT催化剂在直接碱性乙醇燃料电池中具有预期的应用前景。此外，关于CH ₃ COO的最终产物，还通过C2和C1途径提出并讨论了混合Pt / CoNiO ₂ -CNTs的催化机理。^-和CO₃^2-。

更新日期：2017-10-25

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