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用于氧还原反应的负载型钯基电催化剂的研究：性能、耐久性和甲醇耐受性

Investigation of Supported Pd-Based Electrocatalysts for the Oxygen Reduction Reaction: Performance, Durability and Methanol Tolerance.

作者信息

Lo Vecchio Carmelo, Alegre Cinthia, Sebastián David, Stassi Alessandro, Aricò Antonino S, Baglio Vincenzo

机构信息

CNR-ITAE Institute, Via Salita Santa Lucia sopra Contesse, 5, Messina 98126, Italy.

出版信息

Materials (Basel). 2015 Nov 25;8(12):7997-8008. doi: 10.3390/ma8125438.

DOI:10.3390/ma8125438
PMID:28793693
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5458862/
Abstract

Next generation cathode catalysts for direct methanol fuel cells (DMFCs) must have high catalytic activity for the oxygen reduction reaction (ORR), a lower cost than benchmark Pt catalysts, and high stability and high tolerance to permeated methanol. In this study, palladium catalysts supported on titanium suboxides (Pd/TiO) were prepared by the sulphite complex route. The aim was to improve methanol tolerance and lower the cost associated with the noble metal while enhancing the stability through the use of titanium-based support; 30% Pd/Ketjenblack (Pd/KB) and 30% Pd/Vulcan (Pd/Vul) were also synthesized for comparison, using the same methodology. The catalysts were characterized by physico-chemical analysis and investigated for the ORR to evaluate their activity, stability, and methanol tolerance properties. The Pd/KB catalyst showed the highest activity towards the ORR in perchloric acid solution. All Pd-based catalysts showed suitable tolerance to methanol poisoning, leading to higher ORR activity than a benchmark Pt/C catalyst in the presence of low methanol concentration. Among them, the Pd/TiO catalyst showed a very promising stability compared to carbon-supported Pd samples in an accelerated degradation test of 1000 potential cycles. These results indicate good perspectives for the application of Pd/TiO catalysts in DMFC cathodes.

摘要

用于直接甲醇燃料电池（DMFC）的下一代阴极催化剂必须对氧还原反应（ORR）具有高催化活性，成本低于基准铂催化剂，并且具有高稳定性和对渗透甲醇的高耐受性。在本研究中，通过亚硫酸盐络合路线制备了负载在低价钛氧化物上的钯催化剂（Pd/TiO）。目的是提高甲醇耐受性，降低与贵金属相关的成本，同时通过使用钛基载体提高稳定性；还使用相同的方法合成了30% Pd/科琴黑（Pd/KB）和30% Pd/瓦肯（Pd/Vul）用于比较。通过物理化学分析对催化剂进行了表征，并对ORR进行了研究，以评估它们的活性、稳定性和甲醇耐受性。Pd/KB催化剂在高氯酸溶液中对ORR表现出最高活性。所有钯基催化剂对甲醇中毒均表现出适当的耐受性，在低甲醇浓度存在下导致比基准Pt/C催化剂更高的ORR活性。其中，在1000次电位循环的加速降解试验中，与碳载钯样品相比，Pd/TiO催化剂表现出非常有前景的稳定性。这些结果表明Pd/TiO催化剂在DMFC阴极中的应用具有良好前景。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/2bc594db2f0c/materials-08-05438-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/c9aa2554265b/materials-08-05438-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/1d5593b39437/materials-08-05438-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/66fd1e9f73ff/materials-08-05438-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/91c60d873b78/materials-08-05438-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/6aae251e23b4/materials-08-05438-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/56a0c853a7f6/materials-08-05438-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/1fd8e68be637/materials-08-05438-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/0f52c472726a/materials-08-05438-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/2bc594db2f0c/materials-08-05438-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/c9aa2554265b/materials-08-05438-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/1d5593b39437/materials-08-05438-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/66fd1e9f73ff/materials-08-05438-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/91c60d873b78/materials-08-05438-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/6aae251e23b4/materials-08-05438-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/56a0c853a7f6/materials-08-05438-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/1fd8e68be637/materials-08-05438-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/0f52c472726a/materials-08-05438-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2e24/5458862/2bc594db2f0c/materials-08-05438-g009.jpg

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