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- 2015
Pd-Sb/C复合纳米催化剂对甲酸电催化氧化的性能研究
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Abstract:
摘要 以柠檬酸三钠为稳定剂，硼氢化钠为还原剂，制备了碳载型的Pd-Sb复合纳米催化剂（Pd-Sb/C），通过调制不同Pd:Sb摩尔比研究了其对甲酸电催化性能的影响. TEM结果表明，合成的纳米颗粒粒径较小且均匀分散在碳载体表面. XRD和XPS测试表明，Pd-Sb/C中少量的单质态Sb(0)高度分散在Pd颗粒中或表面，形成合金化程度较低的PdSb合金. 电化学测试表明，当Pd:Sb = 20:1时，合成的催化剂对甲酸的催化效能最佳. 与合成的Pd/C和商业Pd/C相比，Pd-Sb/C(20:1)的电流密度分别是Pd/C的2.6倍、商业Pd/C的4.2倍. Pd-Sb/C的整体催化性能得到改善主要归因于适量的单质态Sb(0)引入到Pd中，诱导产生电子效应和“双功能”效应，一方面减小Pd与CO毒性物种之间的吸附作用，另一方面促使Pd表面吸附的CO快速氧化，提高了Pd-Sb/C催化剂的抗CO中毒能力，使得Pd-Sb/C催化剂的整体催化性能得到改善
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