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大颗粒煤反应过程中灰层有效扩散系数的研究 被引量:3
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作者 王苑 罗永浩 +1 位作者 季俊杰 林鹏云 《煤炭转化》 CAS CSCD 北大核心 2010年第3期87-91,共5页
在大颗粒煤燃烧或者气化过程中,气体穿过灰层的有效扩散系数是非常重要的参数.对有效扩散系数的研究主要有两种思路:一方面,灰层本质上是多孔介质,因此在研究有效扩散系数时,沿用气体在多孔介质中扩散的研究思路;另一方面,焦炭的燃烧或... 在大颗粒煤燃烧或者气化过程中,气体穿过灰层的有效扩散系数是非常重要的参数.对有效扩散系数的研究主要有两种思路:一方面,灰层本质上是多孔介质,因此在研究有效扩散系数时,沿用气体在多孔介质中扩散的研究思路;另一方面,焦炭的燃烧或者气化本质上是气固反应,气体在灰层也即产物层中的扩散是气固反应的重要影响因素,因此应用气固反应的理论对有效扩散系数进行研究.根据以上两种思路综述了有效扩散系数的实验和模型的研究现状,并对今后的研究重点进行了展望. 展开更多
关键词 大颗粒煤 燃烧 气化 灰层 有效扩散系数
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MoS2-rGO hybrid architecture as durable support for cathode catalyst in proton exchange membrane fuel cells 被引量:5
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作者 Muhammad Tuoqeer Anwar Xiaohui Yan +6 位作者 Muhammad Rehman Asghar Naveed Husnain Shuiyun Shen Liuxuan Luo Xiaojing Cheng Guanghua Wei Junliang Zhang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第8期1160-1167,共8页
Carbon black is utilized as a conventional electrocatalyst support material for proton exchange membrane fuel cells. However, this support is prone to corrosion under oxidative and harsh environments, thus limiting th... Carbon black is utilized as a conventional electrocatalyst support material for proton exchange membrane fuel cells. However, this support is prone to corrosion under oxidative and harsh environments, thus limiting the durability of the fuel cells. Meanwhile, carbon corrosion would also weaken the linkage between Pt and the support material, which causes Pt agglomeration, and consequently, deterioration of the cell performance. To overcome the drawbacks of a Pt/C electrocatalyst, a hybrid support material comprising molybdenum disulfide and reduced graphene oxide is proposed and synthesized in this study to exploit the graphitic nature of graphene and the availability of the exposed edges of MoS2. TEM results show the uniform dispersion of Pt nanoparticles over the MoS2-rGO surface. Electrochemical measurements indicate higher ECSA retention and better ORR activity after 10000 potential cycles for Pt/MoS2-rGO as compared to Pt/C, demonstrating the improved durability for this hybrid support material. 展开更多
关键词 Fuel cell Hybrid catalyst support Carbon corrosion Supported catalyst Pt-based electrocatalyst
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