Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
Department of Energy Environment Policy and Technology, Green School, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
Sci Rep. 2017 Mar 14;7:44411. doi: 10.1038/srep44411.
This study explores a facile method to prepare an efficient and durable support for Pt catalyst of polymer electrolyte membrane fuel cell (PEMFC). As a candidate, Nb-doped TiO (Nb-TiO) nanofibers are simply fabricated using an electrospinning technique, followed by a heat treatment. Doping Nb into the TiO nanofibers leads to a drastic increase in electrical conductivity with doping level of up to 25 at. % (NbTiO). Pt nanoparticles are synthesized on the prepared 25 at. % Nb-doped TiO-nanofibers (Pt/Nb-TiO) as well as on a commercial powdered carbon black (Pt/C). The Pt/Nb-TiO nanofiber catalyst exhibits similar oxygen reaction reduction (ORR) activity to that of the Pt/C catalyst. However, during an accelerated stress test (AST), the Pt/Nb-TiO nanofiber catalyst retained more than 60% of the initial ORR activity while the Pt/C catalyst lost 65% of the initial activity. The excellent durability of the Pt/Nb-TiO nanofiber catalyst can be attributed to high corrosion resistance of TiO and strong interaction between Pt and TiO.
本研究探索了一种简便的方法来制备用于聚合物电解质膜燃料电池（PEMFC）的 Pt 催化剂的高效且耐用的载体。作为一种候选材料，Nb 掺杂 TiO（Nb-TiO）纳米纤维是通过静电纺丝技术简单制备的，然后进行热处理。将 Nb 掺杂到 TiO 纳米纤维中，导致电导率急剧增加，掺杂水平高达 25 原子%（NbTiO）。在制备的 25 原子% Nb 掺杂 TiO 纳米纤维（Pt/Nb-TiO）以及商业粉末状炭黑（Pt/C）上合成了 Pt 纳米颗粒。Pt/Nb-TiO 纳米纤维催化剂表现出与 Pt/C 催化剂相似的氧反应还原（ORR）活性。然而，在加速应力测试（AST）中，Pt/Nb-TiO 纳米纤维催化剂保留了初始 ORR 活性的 60%以上，而 Pt/C 催化剂失去了初始活性的 65%。Pt/Nb-TiO 纳米纤维催化剂的优异耐久性可归因于 TiO 的高耐腐蚀性和 Pt 与 TiO 之间的强相互作用。
