Phosphorization Treatment Improves the Catalytic Activity and Durability of Platinum Catalysts toward Oxygen Reduction Reaction,Chemistry of Materials

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Phosphorization Treatment Improves the Catalytic Activity and Durability of Platinum Catalysts toward Oxygen Reduction Reaction
Chemistry of Materials ( IF 7.2 ) Pub Date : 2019-09-23 , DOI: 10.1021/acs.chemmater.9b03143
Ruiyun Guo ₁ , Wei Bi ₁ , Ke Zhang ₁ , Yaming Liu ₁ , Chaoqi Wang ₁ , Yangzi Zheng ₁ , Mingshang Jin ₁

Affiliation

Modification of Pt catalysts to achieve satisfactory activities for commercialization of proton exchange membrane fuel cells has attracted numerous attention in recent years. In this work, phosphorization treatment has been developed to enhance the catalytic performance of Pt catalysts toward oxygen reduction reaction (ORR), including both the activity and the durability. By treating Pt with tri-n-octylphosphine at 300 °C for 3 h, Pt nanoparticles can transform to Pt₂P nanoparticles with slightly increased sizes. After the phosphorization treatment, the catalytic performance of Pt catalysts can be enhanced markedly, with a factor of 10.3 enhancement in mass activity and a factor of 10.2 enhancement in specific activity, respectively. More importantly, long-term stability tests (30 000 cycles of accelerated durability tests) demonstrated that the excellent durability could be obtained after the phosphorization treatment, with a drop of 9.1% in mass activity, showing another advantage of the method reported in this work. Given the highly improved catalytic performance, one can anticipate that the nanocrystals composed of Pt and P atoms would shed new light on next-generation energy conversion and storage devices, and offer an efficient phosphorization treatment strategy for promoting activity and durability of Pt electrocatalysts.

中文翻译：

磷化处理提高了铂催化剂对氧还原反应的催化活性和耐久性

近年来，为了使质子交换膜燃料电池商品化而实现令人满意的活性的Pt催化剂的改性引起了广泛的关注。在这项工作中，已经开发了磷化处理以增强Pt催化剂对氧还原反应（ORR）的催化性能，包括活性和耐久性。通过用三-治疗的Pt Ñ在300℃下3小时-octylphosphine，铂纳米颗粒可以转变为铂₂P纳米粒子的尺寸略有增加。经过磷化处理后，Pt催化剂的催化性能可以得到显着提高，质量活性提高了10.3倍，比活性提高了10.2倍。更重要的是，长期稳定性测试（3万次加速耐久性测试循环）表明，经过磷化处理后，可以获得优异的耐久性，质量活性下降了9.1％，这表明该方法报道的方法的另一个优势。鉴于催化性能已大大提高，人们可以预料到，由Pt和P原子组成的纳米晶体将为下一代能量转换和存储设备提供新的亮点，

更新日期：2019-09-23

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