School of Materials Science and Engineering , Baise University , Baise , Guangxi 533000 , China.
College of Materials Science and Engineering , Guilin University of Technology , Guilin , Guangxi 532100 , China.
ACS Appl Mater Interfaces. 2019 Mar 6;11(9):9117-9124. doi: 10.1021/acsami.8b21459. Epub 2019 Feb 20.
Polymer electrolyte membrane fuel cells are appealing to resolve the environmental and energy issues but are still heavily inhibited by the dilemma of fabricating effective and durable electrocatalysts for oxygen reduction reaction (ORR). In this work, highly open PtCu nanoframes and one-dimensional, hollow titanium nitride architectures are both successfully explored and implemented as the new system to replace the traditional Pt-carbon motif. The ORR performance of the obtained electrocatalyst shows specific and mass activities of 5.32 mA cm and 2.43 A mg, respectively, which are 14.4 and 11.6 times higher than those of the commercial Pt/C. Notably, the novel catalyst also exhibits high stability and a much slower performance degradation than that of the benchmarked PtCu/C with the same durability testing procedures. The comprehensive data confirm that the new type of catalyst possesses a high charge transfer during the ORR process, and the unique structure and synergistic effects between anchored Pt and the support mainly contributes to the high stability. This work provides a strategic method for designing an effective ORR electrocatalyst with desirable stability.
聚合物电解质膜燃料电池在解决环境和能源问题方面具有吸引力，但仍受到为氧还原反应（ORR）制造有效和耐用电催化剂的困境的严重限制。在这项工作中，高度开放的 PtCu 纳米框架和一维、空心氮化钛结构都被成功探索并应用于替代传统的 Pt-碳基序的新体系。所获得的电催化剂的 ORR 性能表现出分别为 5.32 mA cm 和 2.43 A mg 的比质量活性和比表面积活性，分别是商业 Pt/C 的 14.4 和 11.6 倍。值得注意的是，新型催化剂在相同的耐久性测试程序下也表现出比基准 PtCu/C 更高的稳定性和更慢的性能衰减。综合数据证实，新型催化剂在 ORR 过程中具有较高的电荷转移，而锚定的 Pt 和载体之间的独特结构和协同效应主要有助于提高稳定性。这项工作为设计具有理想稳定性的有效 ORR 电催化剂提供了一种策略方法。
