Xu Hui, Huang Bingji, Zhao Yitao, He Guangyu, Chen Haiqun
Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, Jiangsu Province, China.
Inorg Chem. 2022 Mar 14;61(10):4533-4540. doi: 10.1021/acs.inorgchem.2c00296. Epub 2022 Mar 2.
The electrooxidation of ethylene glycol (EG) is of vital significance for the conversion from biomass energy into electrical energy via direct fuel cells. However, the EG oxidation reaction (EGOR) suffers from poor efficiency due to the limitation of high-performance electrocatalysts for cleaving the C-C bonds. Herein, this limitation is successfully addressed by fabricating the doughnut-shaped Pd-BiTe heterostructured catalyst. Notably, the heterojunction Pd-BiTe nanocatalyst has been demonstrated to be highly active toward the EGOR with superb activity and durability, in which a mass activity as high as 2420.8 mA mg is achieved in alkaline media, being 1.7 times higher than that of the commercial Pd/C catalyst. Upon combination of experimental results with mechanism studies, it is indicated that the remarkable EGOR performance is attributed to the enlarged active areas that stemmed from the doughnut-like structure, as well as the strong synergistic effect from Pd-BiTe and Pd. More importantly, the highly electroactive Pd-BiTe can accelerate charge transfer and boost the oxidation of CO-like intermediates, which are conducive to the enhancement in electrochemical stability.
通过直接燃料电池将生物质能转化为电能的过程中，乙二醇（EG）的电氧化具有至关重要的意义。然而，由于用于裂解C-C键的高性能电催化剂的限制，乙二醇氧化反应（EGOR）的效率较低。在此，通过制备环形Pd-BiTe异质结构催化剂成功解决了这一限制。值得注意的是，已证明异质结Pd-BiTe纳米催化剂对EGOR具有高活性，具有出色的活性和耐久性，在碱性介质中实现了高达2420.8 mA mg的质量活性，比商业Pd/C催化剂高1.7倍。结合实验结果和机理研究表明，显著的EGOR性能归因于源自环形结构的扩大的活性区域，以及Pd-BiTe和Pd之间的强协同效应。更重要的是，高电活性的Pd-BiTe可以加速电荷转移并促进类CO中间体的氧化，这有利于提高电化学稳定性。
