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In situ processed tungsten carbide/carbon black-supported platinum electrocatalysts for enhanced electrochemical stability and activity
Green Chemistry ( IF 9.3 ) Pub Date : 2020/02/22 , DOI: 10.1039/c9gc03453f Hyunwoong Na 1, 2, 3, 4, 5 , Hanshin Choi 4, 5, 6, 7 , Ji-Won Oh 4, 5, 6, 7 , Da Bin Kim 1, 2, 3, 4 , Yong Soo Cho 1, 2, 3, 4
Green Chemistry ( IF 9.3 ) Pub Date : 2020/02/22 , DOI: 10.1039/c9gc03453f Hyunwoong Na 1, 2, 3, 4, 5 , Hanshin Choi 4, 5, 6, 7 , Ji-Won Oh 4, 5, 6, 7 , Da Bin Kim 1, 2, 3, 4 , Yong Soo Cho 1, 2, 3, 4
Affiliation
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High performance electrocatalysts have been intensively studied to reduce the usage of expensive platinum-group metals and to obtain excellent electrochemical durability. Herein, we introduce a very promising processing technique based on the low-temperature in situ synthesis of tungsten carbide nanoparticles with carbon under a highly energetic arc plasma atmosphere prior to the deposition of Pt nanoparticles. There is no external supply of carbon for this synthesis since the carbon black (CB) support acts as a source of carbon. Multiple phases, including WC, W2C, and W1−xC, were found to exist by the electron diffraction analytical simulation technique. The final structure of Pt/WxC/CB showed significantly better performance in terms of electrocatalytic activities, such as electrochemically active surface area, methanol oxidation activity, mass activity, CO tolerance, and 10 000 cycle-accelerated durability test, compared to those of the commercial reference sample containing more Pt. The origin of the enhancement was understood to be associated primarily with the presence of WxC itself, a smaller scale of well dispersed WxC nanoparticles, reduced oxidation of Pt, and graphitization of the CB matrix.
中文翻译：
原位处理的碳化钨/炭黑负载铂电催化剂，可增强电化学稳定性和活性
为了减少昂贵的铂族金属的使用并获得优异的电化学耐久性，已经对高性能的电催化剂进行了深入研究。本文中，我们介绍了一种非常有前途的加工技术，该技术基于在沉积Pt纳米颗粒之前在高能电弧等离子体气氛下用碳进行碳化钨纳米颗粒与碳的低温原位合成。由于炭黑（CB）载体充当碳源，因此没有外部碳源可用于该合成。多个阶段，包括WC，W 2 C，并且W 1 X C，发现通过电子衍射解析模拟技术存在。Pt / W x的最终结构与包含更多Pt的商业参考样品相比，C / CB在电催化活性方面表现出明显更好的性能，例如电化学活性表面积，甲醇氧化活性，质量活性，CO耐受性和10000次循环加速耐久性测试。据了解，这种增强作用的起源主要与W x C本身的存在，较小比例的W x C纳米颗粒充分分散，Pt的氧化减少以及CB基质的石墨化有关。
更新日期：2020-03-24
中文翻译：
原位处理的碳化钨/炭黑负载铂电催化剂，可增强电化学稳定性和活性
为了减少昂贵的铂族金属的使用并获得优异的电化学耐久性，已经对高性能的电催化剂进行了深入研究。本文中，我们介绍了一种非常有前途的加工技术，该技术基于在沉积Pt纳米颗粒之前在高能电弧等离子体气氛下用碳进行碳化钨纳米颗粒与碳的低温原位合成。由于炭黑（CB）载体充当碳源，因此没有外部碳源可用于该合成。多个阶段，包括WC，W 2 C，并且W 1 X C，发现通过电子衍射解析模拟技术存在。Pt / W x的最终结构与包含更多Pt的商业参考样品相比，C / CB在电催化活性方面表现出明显更好的性能，例如电化学活性表面积，甲醇氧化活性，质量活性，CO耐受性和10000次循环加速耐久性测试。据了解，这种增强作用的起源主要与W x C本身的存在，较小比例的W x C纳米颗粒充分分散，Pt的氧化减少以及CB基质的石墨化有关。
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