Zaman Shahid, Tian Xinlong, Su Ya-Qiong, Cai Weiwei, Yan Ya, Qi Ruijuan, Douka Abdoulkader Ibro, Chen Shenghua, You Bo, Liu Hongfang, Ding Shujiang, Guo Xingpeng, Xia Bao Yu
School of Chemistry and Chemical Engineering, Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan 430074, China.
School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China.
Sci Bull (Beijing). 2021 Nov 15;66(21):2207-2216. doi: 10.1016/j.scib.2021.07.001. Epub 2021 Jul 3.
Developing efficient platinum (Pt)-based electrocatalysts is enormously significant for fuel cells. Herein, we report an integrated electrocatalyst of ultralow-Pt alloy encapsulated into nitrogen-doped nanocarbon architecture for efficient oxygen reduction reaction. This hybrid Pt-based catalyst achieves a mass activity of 3.46 A mg at the potential of 0.9 V vs. RHE with a negligible stability decay after 10,000 cycles. More importantly, this half-cell activity can be expressed at full cell level with a high Pt utilization of 10.22 W mg and remarkable durability after 30,000 cycles in single-cell. Experimental and theoretical investigations reveal that a highly strained Pt structure with an optimal Pt-O binding energy is induced by the incorporation of Co/Ni into Pt lattice, which would account for the improved reaction kinetics. The synergistic catalysis due to nitrogen-doped nanocarbon architecture and active Pt component is responsible for the enhanced catalytic activity. Meanwhile, the strong metal-support interaction and optimized hydrophilic properties of nanocarbon matrix facilitate efficient mass transport and water management. This work may provide significant insights in designing the low-Pt integrated electrocatalysts for fuel cells and beyond.
开发高效的铂基电催化剂对燃料电池具有极其重要的意义。在此，我们报道了一种超低铂合金封装在氮掺杂纳米碳结构中的集成电催化剂，用于高效氧还原反应。这种基于铂的混合催化剂在相对于可逆氢电极（RHE）为0.9 V的电位下实现了3.46 A mg的质量活性，在10000次循环后稳定性衰减可忽略不计。更重要的是，这种半电池活性可以在全电池水平上体现，铂利用率高达10.22 W mg，在单电池中经过30000次循环后具有出色的耐久性。实验和理论研究表明，通过将钴/镍掺入铂晶格中，诱导出具有最佳铂-氧结合能的高应变铂结构，这可以解释反应动力学的改善。氮掺杂纳米碳结构与活性铂组分之间的协同催化作用是催化活性增强的原因。同时，强金属-载体相互作用和纳米碳基质优化的亲水性有助于高效的质量传输和水管理。这项工作可能为设计用于燃料电池及其他领域的低铂集成电催化剂提供重要的见解。
