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排序方式: 共有752条查询结果,搜索用时 7 毫秒
751.
Dr. Gen Huang Yingying Li Dr. Li Tao Dr. Zhifeng Huang Dr. Zhijie Kong Dr. Chao Xie Dr. Shiqian Du Dr. Tehua Wang Yujie Wu Qie Liu Dongcai Zhang Jiaqi Lin Miaoyu Li Jun Wang Prof. Jin Zhang Prof. Shanfu Lu Prof. Yi Cheng Prof. Shuangyin Wang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2023,135(1):e202215177
The durability degradation during stack-operating conditions seriously deteriorates the lifetime and performance of the fuel cell. To alleviate the rapid potential rise and performance degradation, an anode design is proposed to match the working temperature of high-temperature proton exchange membrane fuel cells (HT-PEMFCs) with the release temperature of hydrogen from palladium. The result is significantly enhanced hydrogen oxidation reaction (HOR) activity of Pd and superior performance of the Pd anode. Furthermore, Pd as hydrogen buffer and oxygen absorbent layer in the anode can provide additional in situ hydrogen and absorb infiltrated oxygen during local fuel starvation to maintain HOR and suppress reverse-current degradation. Compared with the traditional Pt/C anode, the Pd/C also greatly improved HT-PEMFCs durability during start-up/shut-down and current mutation. The storage/release of hydrogen provides innovative guidance for improving the durability of PEMFCs. 相似文献
752.
Jiaqi Zhao Ya Bai Zhenhua Li Dr. Jinjia Liu Dr. Wei Wang Pu Wang Dr. Bei Yang Dr. Run Shi Prof. Geoffrey I. N. Waterhouse Prof. Xiao-Dong Wen Prof. Qing Dai Prof. Tierui Zhang 《Angewandte Chemie (International ed. in English)》2023,62(13):e202219299
The activation of water molecules in thermal catalysis typically requires high temperatures, representing an obstacle to catalyst development for the low-temperature water-gas shift reaction (WGSR). Plasmonic photocatalysis allows activation of water at low temperatures through the generation of light-induced hot electrons. Herein, we report a layered double hydroxide-derived copper catalyst (LD-Cu) with outstanding performance for the low-temperature photo-driven WGSR. LD-Cu offered a lower activation energy for WGSR to H2 under UV/Vis irradiation (1.4 W cm−2) compared to under dark conditions. Detailed experimental studies revealed that highly dispersed Cu nanoparticles created an abundance of hot electrons during light absorption, which promoted *H2O dissociation and *H combination via a carboxyl pathway, leading to the efficient production of H2. Results demonstrate the benefits of exploiting plasmonic phenomena in the development of photo-driven low-temperature WGSR catalysts. 相似文献