Nanostructured palladium catalyst poisoning depressed by cobalt phosphide in the electro-oxidation of formic acid for fuel cells
Nanostructured palladium catalyst poisoning depressed by cobalt phosphide in the electro-oxidation of formic acid for fuel cells
复制标题
燃料电池甲酸电氧化过程中磷化钴抑制纳米结构钯催化剂中毒
DOI：
10.1016/j.nanoen.2016.10.023
复制
发表时间：
2016-12-01
期刊：
影响因子：
17.6
通讯作者：
Zhang, Jiujun
中科院分区：
文献类型：
--
作者：
Feng, Ligang;Chang, Jinfa;Zhang, Jiujun
纳米结构钯被认为是直接甲酸燃料电池的最佳催化剂材料，但中间体对催化剂的毒害严重降低了催化剂的活性和稳定性，从而进一步阻碍了燃料电池技术的商业化应用。在此，我们报告棘手的Pd催化剂中毒问题可以大大降低磷化钴（CoP）材料在甲酸氧化过程中，所以一个非常活跃和稳定的Pd催化剂与非常低的Pd负载量（5重量%）实现。与Pd/C催化剂相比，其抗中毒能力强，反应动力学速度快，表面吸附的中毒中间体少。当集成到真实的燃料电池模型中时，由该Pd-CoP/C催化剂（5重量%，Pd）催化的150 mW cm（-2）的功率密度与商业Pd/C催化剂（20重量%，Pd）的功率密度相当，表明在电化学能量装置中非常有前景的应用。这项工作开辟了一条途径，以克服普遍的催化剂中毒问题，推动钯催化剂系统更强大的商业应用在燃料电池技术。
Nanostructured palladium is considered as the best catalyst materials for direct formic acid fuel cells but catalyst poisoning suffering from the intermediates seriously reduces catalytic activity and stability, thus further hinders the commercial application of fuel cells technology. Herein, we report the tricky Pd catalyst poisoning problem could be greatly depressed by cobalt phosphide (CoP) material during formic acid oxidation, so an extremely active and stable Pd catalyst with very low Pd loading (5 wt%) is realized. The high anti-poisoning ability was evidenced by a significantly faster kinetics study and less poisoning intermediates adsorbed on its surface compared with Pd/C catalyst. When integrated into a real fuel cells model, a power density of 150 mW cm(-2) catalyzed by this Pd-CoP/C catalyst (5 wt%, Pd) was comparable to that of the commercial Pd/C catalyst (20 wt%, Pd) indicating a very promising application in the electrochemical energy devices. This work opens an avenue to overcome the universal catalyst poisoning issue and pushes Pd catalyst system much stronger for commercial application in fuel cells technology.