Anodization driven enhancement of catalytic activity of Pd towards electro-oxidation of methanol, ethanol and formic acid

Anodization driven enhancement of catalytic activity of Pd towards electro-oxidation of methanol, ethanol and formic acid
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阳极氧化驱动钯对甲醇、乙醇和甲酸电氧化的催化活性增强

DOI:
10.1016/j.elecom.2012.04.023
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发表时间:
2012-07
期刊:
Electrochemistry Communications (IF=4.859)
影响因子:
--
通讯作者:
Zhonghua Zhang
Zhonghua Zhang
中科院分区:
其他
文献类型:
--
作者:
Junzhe Sun;Yingzi Wang;Chi Zhang;Tianyi Kou;Zhonghua Zhang

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研究了Pd在1.0M H2SO4溶液中的阳极氧化过程,该过程能够自发形成Pd纳米颗粒。电化学测试结果表明,阳极氧化后的Pd具有更大的电化学活性表面积(EASA),对甲醇、乙醇和甲酸的电氧化具有优异的催化活性。阳极氧化后的Pd具有良好的电催化活性。在碱性介质中,对甲醇和乙醇的催化氧化活性分别是平面Pd的260倍和210倍。此外,阳极氧化后的Pd对甲醇的扩散控制电氧化具有上级稳态活性,阳极氧化大大提高了每个Pd原子的本征催化活性.阳极氧化钯是一种很有前途的燃料电池阳极催化剂。
The anodization of Pd in a 1.0M H2SO4solution has been investigated, which enables spontaneous formation of Pd nanoparticles. Electrochemical measurements show that the anodized Pd exhibits significantly larger electrochemically active surface area (EASA) and excellent catalytic activity towards electro-oxidation of methanol, ethanol, and formic acid in comparison to the flat Pd. The electro-catalytic activity of the anodized Pd is ca. 260 and 210 times higher than that of the flat Pd for the oxidation of methanol and ethanol in the alkaline media, respectively. Moreover, the anodized Pd presents superior steady-state activity for the diffusion-controlled electro-oxidation of methanol, and the anodization greatly enhances the intrinsic catalytic activity of each Pd atom. The anodized Pd will be a promising candidate for anode catalysts of fuel cells.
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