Trimetallic PtNiCo branched nanocages as efficient and durable bifunctional electrocatalysts towards oxygen reduction and methanol oxidation reactions,Journal of Materials Chemistry A

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Trimetallic PtNiCo branched nanocages as efficient and durable bifunctional electrocatalysts towards oxygen reduction and methanol oxidation reactions
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-10-06 , DOI: 10.1039/d1ta07488a
Hengrui Ma ₁ , Zhiping Zheng ₁ , Hongsheng Zhao ₁ , Cong Shen ₁ , Hanming Chen ₁ , Huiqi Li ₁ , Zhenming Cao ₁ , Qin Kuang ₁ , Haixin Lin ₁ , Zhaoxiong Xie ₁

Affiliation

Engineering the composition and structure of Pt-based alloy electrocatalysts has exhibited great promise for enhancing activity and durability in the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR). However, it remains a great challenge to completely achieve this goal because of sluggish kinetics and surface CO poisoning. Herein, we successfully constructed trimetallic PtNiCo branched nanocages via a simple etching treatment. The trimetallic PtNiCo nanocages exhibited outstanding activity and durability in both acidic ORR and MOR. Strikingly, the mass activity of the catalyst in ORR and MOR reached 1.03 A mg_Pt⁻¹ and 2.82 A mg_Pt⁻¹, with 13.8- and 5.6-times enhancement of specific activity compared to Pt/C. Detailed investigations reveal that the most optimized electronic structure for the d-band center (a 0.17 eV downshift compared to pure Pt) by the alloying effect of Co and Ni contributed to the enhanced performances and great CO-tolerance of such unique Pt-based catalysts, which provide a new perspective for designing high-performance electrocatalysts for commercial fuel cells.

中文翻译：

三金属 PtNiCo 支化纳米笼作为高效耐用的双功能电催化剂，用于氧还原和甲醇氧化反应

对 Pt 基合金电催化剂的成分和结构进行改造，在提高氧还原反应 (ORR) 和甲醇氧化反应 (MOR) 的活性和耐久性方面表现出巨大的希望。然而，由于动力学缓慢和表面 CO 中毒，完全实现这一目标仍然是一个巨大的挑战。在此，我们通过简单的蚀刻处理成功构建了三金属 PtNiCo 分支纳米笼。三金属 PtNiCo 纳米笼在酸性 ORR 和 MOR 中均表现出出色的活性和耐久性。引人注目的是，催化剂在 ORR 和 MOR 中的质量活性达到 1.03 A mg _Pt^-1和 2.82 A mg _Pt^-1，与 Pt/C 相比，比活性提高了 13.8 倍和 5.6 倍。详细研究表明，通过 Co 和 Ni 的合金化效应，d 带中心最优化的电子结构（与纯 Pt 相比降低了 0.17 eV）有助于这种独特的 Pt 基催化剂的性能增强和良好的 CO 耐受性，这为设计用于商业燃料电池的高性能电催化剂提供了新的视角。

更新日期：2021-10-12

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