The sluggish oxygen reduction reaction (ORR) at the cathode largely hinders the practical application of the proton-exchange membrane fuel cells (PEMFCs). Pt-based nanocrystals are the most effective electrocatalysts for the oxygen reduction reaction, however, suffer high cost, scarcity and unsatisfied durability. Herein, we report a new category of annealed multimetallic core-shell catalyst of gold core doped with titanium and platinum-nickel (PtNi) shell with Pt-rich surface as a highly active and robust electrocatalyst for ORR. The introduction of titanium can effectively stabilize the gold core, avoiding the outward migration of Au atoms and ensuring the exposure of Pt-Ni active sites. The experimental findings revealed that the annealed Ti-Au@PtNi NPs catalyst provides 19.26 and 9.84 times higher mass and specific activities than commercial Pt/C catalysts for the oxygen reduction reaction. Moreover, durability tests of annealed Ti-Au@PtNi NPs show no noticeable activity loss even after 20000 potential cycles between 0.6 and 1.0 V vs. RHE, demonstrating a promising catalyst for the oxygen reduction reaction.

阴极缓慢的氧还原反应（ORR）很大程度上阻碍了质子交换膜燃料电池（PEMFC）的实际应用。铂基纳米晶是氧还原反应最有效的电催化剂，但其成本高、稀缺且耐用性不理想。在此，我们报告了一种新的退火多金属核壳催化剂，其金核掺杂钛和铂镍（PtNi）壳，表面富铂，作为高活性和坚固的ORR电催化剂。钛的引入可以有效稳定金核，避免Au原子向外迁移，保证Pt-Ni活性位点的暴露。实验结果表明，退火后的 Ti-Au@PtNi NPs 催化剂在氧还原反应中的质量和比活性比商业 Pt/C 催化剂高 19.26 倍和 9.84 倍。此外，退火后的 Ti-Au@PtNi NP 的耐久性测试表明，即使在 0.6 至 1.0 V vs. 0.6 至 1.0 V 电压之间进行 20000 次电位循环后，也没有明显的活性损失。RHE，展示了一种有前途的氧还原反应催化剂。