Strong Interaction between Platinum Nanoparticles and Tantalum-Doped Tin Oxide Nanofibers and Its Activation and Stabilization Effects for Oxygen Reduction Reaction,ACS Catalysis

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Strong Interaction between Platinum Nanoparticles and Tantalum-Doped Tin Oxide Nanofibers and Its Activation and Stabilization Effects for Oxygen Reduction Reaction
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-08-18 , DOI: 10.1021/acscatal.0c02220
Ignacio Jiménez-Morales ₁ , Fatima Haidar ₁ , Sara Cavaliere _{1,

2} , Deborah Jones ₁ , Jacques Rozière ₁

Affiliation

Electrocatalyst supports stable to high potential are required for the proton exchange membrane fuel cell cathode. Electrocatalyst supports based on tantalum-doped tin oxide (Ta/SnO₂) were prepared by electrospinning. The dopant amount was varied between 0 (undoped SnO₂) and 7.5 at. %, and the resulting materials were characterized for their morphology, composition, structure, porosity, and electrical properties. Platinum nanoparticles prepared by a microwave-assisted polyol method were deposited with different loadings on 1 at. % Ta-doped SnO₂ (1Ta/SnO₂), selected for its highest electrical conductivity of 0.09 S cm^–1. Their electrocatalytic properties toward the oxygen reduction reaction (ORR) were compared with those of the same particles deposited on carbon black and those of a commercial carbon-supported Pt catalyst. Pt/1Ta/SnO₂ showed higher ORR activity and stability at high potential than Pt/C. In particular, the electrocatalyst with the lowest Pt loading (7 wt %) presented high mass activity and stability which, from XPS analysis, is suggested to result from very strong metal–support interaction. These results indicate that amongst tin oxides doped with pentavalent metals such as niobium (Nb/SnO₂), antimony (Sb/SnO₂), and tantalum, Ta/SnO₂ has the advantage of both higher conductivity than Nb/SnO₂ and greater stability in the fuel cell voltage range than Sb/SnO₂.

中文翻译：

铂纳米粒子与掺杂钽的氧化锡纳米纤维之间的强相互作用及其对氧还原反应的活化和稳定作用

质子交换膜燃料电池阴极需要稳定至高电位的电催化剂载体。通过电纺丝制备了基于钽掺杂的氧化锡（Ta / SnO ₂）的电催化剂载体。掺杂剂的量在0（未掺杂的SnO ₂）和7.5at。之间变化。％，并且表征所得材料的形态，组成，结构，孔隙率和电性能。通过微波辅助多元醇方法制备的铂纳米颗粒以不同的负载量沉积在1 at。％Ta掺杂的SnO ₂（1Ta / SnO ₂），被选择为具有0.09 S cm ^–1的最高电导率。将其对氧还原反应（ORR）的电催化性能与沉积在炭黑上的相同颗粒的电催化性能以及市售的碳载Pt催化剂的电催化性能进行了比较。与Pt / C相比，Pt / 1Ta / SnO ₂在高电势下具有更高的ORR活性和稳定性。特别是，具有最低Pt负载量（7 wt％）的电催化剂表现出高质量活性和稳定性，根据XPS分析，建议该催化剂是由非常强的金属-载体相互作用产生的。这些结果表明，在掺杂有铌（Nb / SnO ₂），锑（Sb / SnO ₂）和钽等五价金属的氧化锡中，Ta / SnO ₂具有比Nb / SnO ₂高的导电性的优点。并且在燃料电池电压范围内的稳定性高于Sb / SnO ₂。

更新日期：2020-09-20

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