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首页> 外文期刊>RSC Advances >Effect of acid-leaching on carbon-supported copper phthalocyanine tetrasulfonic acid tetrasodium salt (CuTSPc/C) for oxygen reduction reaction in alkaline electrolyte: active site studies
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Effect of acid-leaching on carbon-supported copper phthalocyanine tetrasulfonic acid tetrasodium salt (CuTSPc/C) for oxygen reduction reaction in alkaline electrolyte: active site studies

机译：酸浸出对碳负载铜酞菁硫酸四胞盐（CutSPC / C）在碱性电解质中氧还原反应的影响：活性部位研究

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摘要

Although non-precious metal catalysts (NPMCs) have been extensively studied as low-cost catalyst alternatives to Pt, in particular for the oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells (PEMFCs), the nature of the active ORR catalytic sites is still a subject of controversy. In this work, using carbon-supported copper phthalocyanine tetrasulfonic acid tetrasodium salt (CuTSPc/C) nanoparticles as the target catalyst, the effects of the transition metal Cu on the ORR active sites are systematically studied using both rotating disk electrode (RDE) and rotating ring disk electrode (RRDE) techniques in alkaline electrolyte. The results show that acid-leaching can significantly decrease the ORR activity of the CuTSPc/C catalyst, with the half-wave potential negatively shifted by more than 50 mV compared to the catalyst before acid-leaching. The electron transfer number of the ORR process catalyzed by the catalyst before acid-leaching remained at about 3.85 over the whole tested potential range from -0.6 to -0.1 V, while this number greatly decreased from 3.82 at -0.55 V to 3.53 at -0.1 V after acid-leaching. The H2O2 produced accordingly increased sharply from 7.8% to 22%. XRD and TEM results indicate that acid-leaching is an effective method to remove metal-Cu. XPS analysis reveals that metal-Cu is essential in the ORR active site structure, and also plays a key part in the stabilization of the active N and S species.
机译：尽管已经广泛地研究了非贵金属催化剂（NPMC）作为低成本的催化剂替代品至Pt，特别是对于聚合物电解质膜燃料电池（PEMFCs）中的氧还原反应（ORR），活性ORR催化位点的性质仍然是一个争议的主题。在这项工作中，使用碳负载的铜酞菁硫酸四硫酸四胞盐（CutSPC / C）纳米粒子作为靶催化剂，使用旋转盘电极（RDE）和旋转系统地研究过渡金属Cu对ORR活性部位的影响碱性电解质中的环形盘电极（RRDE）技术。结果表明，酸浸出可以显着降低CutSPC / C催化剂的ORR活性，与酸浸出前的催化剂相比，半波电位与催化剂相比呈现超过50mV。在酸浸出前催化剂催化的ORR工艺的电子转移次数在-0.6至-0.1V的整个测试电位范围内保持在约3.85，而该数量在-0.55V至3.53处，此数量大大降低至-0.1乙酸浸出后。因此，H2O2产生的急剧增加到7.8％至22％。 XRD和TEM结果表明酸浸出是除去金属-Cu的有效方法。 XPS分析表明，金属-C在ORR活性部位结构中是必需的，并且还在活性N和S物种的稳定下起作用的关键部分。

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  • 来源
    《RSC Advances》 |2015年第62期|共9页
  • 作者

    Zhang Qing; Zhu Taishan; Qing Xin; Qiao Jinli; Sun Shuhui;

  • 作者单位

    Henan Normal Univ Sch Chem &

    Chem Engn Key Lab Green Chem Media &

    React Minist Educ Xinxiang 453007 Henan Peoples R China;

    Donghua Univ Coll Environm Sci &

    Engn Shanghai 201620 Peoples R China;

    Donghua Univ Coll Environm Sci &

    Engn Shanghai 201620 Peoples R China;

    Henan Normal Univ Sch Chem &

    Chem Engn Key Lab Green Chem Media &

    React Minist Educ Xinxiang 453007 Henan Peoples R China;

    INRS Energie Mat Telecommun Res Ctr Varennes PQ J3X 1S2 Canada;

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  • 正文语种 eng
  • 中图分类 化学;
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