Ionic liquid polyoxometalate-enhanced Pd/N,P-codoped coal-based carbon fiber catalysts for formic acid electrooxidation
Ionic liquid polyoxometalate-enhanced Pd/N,P-codoped coal-based carbon fiber catalysts for formic acid electrooxidation
复制标题
用于甲酸电氧化的离子液体多金属氧酸盐增强Pd/N,P共掺杂煤基碳纤维催化剂
DOI：
10.1016/j.apsusc.2020.146137
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发表时间：
2020-06-30
影响因子：
6.7
通讯作者：
Shi, Hongli
中科院分区：
文献类型：
--
作者：
Lou, Mengran;Wang, Ruiying;Shi, Hongli
直接甲酸燃料电池在能源领域具有巨大的应用潜力，但其商业化受到CO中毒和Pd基阳极催化剂性能低下的阻碍。本研究成功地合成了由Pd、有机-无机杂化咪唑离子液体聚氧乙烯酸盐和N，P共掺杂的煤基碳纤维组成的新型复合催化剂。物理和电化学表征结果表明，所制备的Pd基复合催化剂具有良好的抗CO中毒性能，对甲酸的电催化氧化具有较好的电催化活性。值得注意的是，用具有长烷基链的咪唑离子液体聚氧乙烯酸酯改性的催化剂的CO氧化起始电位比未改性的催化剂的CO氧化起始电位低0.1V。所制备的Pd催化剂在甲酸氧化中的质量活性为754.1 mA mg-1 Pd。有机-无机杂化聚氧乙烯酸盐有望进一步应用于燃料电池催化剂。
Direct formic acid fuel cells have great application potential in the energy field, but their commercialization is hindered by the CO poisoning and low performance of Pd-based anode catalysts. In this study, novel composite catalysts composed of Pd, organic-inorganic hybrid imidazole ionic liquid polyoxometalates, and N,P-codoped coal-based carbon fibers with good dispersion and smaller Pd nanoparticles were synthesized successfully. Physical and electrochemical characterizations revealed that the as-prepared Pd-based composite catalysts have excellent CO poisoning resistance and enhanced electrocatalytic activity in formic acid electrooxidation. Notably, the CO oxidation onset potential of a catalyst modified by imidazole ionic liquid polyoxometalate with long alkyl chain was 0.1 V lower than that of the unmodified catalyst. The mass activity of the as-prepared Pd catalyst in formic acid oxidation was 754.1 mA mg−1Pd. It is expected that organic-inorganic hybrid polyoxometalates can be further applied to fuel cell catalysts.