Ultrathin Nanotube Structure for Mass-Efficient and Durable Oxygen Reduction Reaction Catalysts in PEM Fuel Cells,Journal of the American Chemical Society

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Ultrathin Nanotube Structure for Mass-Efficient and Durable Oxygen Reduction Reaction Catalysts in PEM Fuel Cells
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2022-10-05 , DOI: 10.1021/jacs.2c08361
Jieyuan Liu ₁ , Shiyuan Liu ₁ , Fangzheng Yan ₁ , Zishu Wen ₁ , Weiwei Chen _{2,

3} , Xiaofang Liu ₁ , Qingtao Liu ₁ , Jiaxiang Shang ₁ , Ronghai Yu ₁ , Dong Su ₂ , Jianglan Shui ₁

Affiliation

It remains a challenge for platinum-based oxygen reduction reaction catalysts to simultaneously possess high mass activity and high durability in proton-exchange-membrane fuel cells. Herein, we report ultrathin holey nanotube (UHT)-structured Pt–M (M = Ni, Co) alloy catalysts that achieve unprecedented comprehensive performance. The nanotubes have ultrathin walls of 2–3 nm and construct self-supporting network-like catalyst layers with thicknesses of less than 1 μm, which have efficient mass transfer and 100% surface exposure, thus enabling high utilization of Pt atoms. Combined with the high intrinsic activity produced by the alloying effect, the catalysts achieve high mass activity. Moreover, the nanotube structure not only avoids the agglomeration problem of nanoparticles, but the low curvature of the tube wall also gives UHT a low surface energy (less than 1/3 of that of the same size nanoparticle), so UHT is more resistant to the Ostwald ripening and is stable. For the first time, the U.S. DOE mass activity target and dual durability targets for load and start–stop cycles are achieved on one catalyst. This study provides an effective structural strategy for the preparation of electrocatalysts with high atomic efficiency and excellent durability.

中文翻译：

用于 PEM 燃料电池中质量高效且耐用的氧还原反应催化剂的超薄纳米管结构

铂基氧还原反应催化剂在质子交换膜燃料电池中同时具有高质量活性和高耐久性仍然是一个挑战。在此，我们报告了具有前所未有的综合性能的超薄多孔纳米管 (UHT) 结构的 Pt-M (M = Ni, Co) 合金催化剂。纳米管具有 2-3 nm 的超薄壁，并构建了厚度小于 1 μm 的自支撑网络状催化剂层，具有高效的传质和 100% 的表面暴露，从而实现了 Pt 原子的高利用率。结合合金化效应产生的高本征活性，催化剂实现了高质量活性。而且，纳米管结构不仅避免了纳米粒子的团聚问题，但管壁的低曲率也使 UHT 具有较低的表面能（小于相同尺寸纳米颗粒的 1/3），因此 UHT 更耐奥斯特瓦尔德熟化并且稳定。首次在一个催化剂上实现了美国能源部的质量活动目标和负载和启停循环的双重耐久性目标。该研究为制备具有高原子效率和优异耐久性的电催化剂提供了一种有效的结构策略。

更新日期：2022-10-05

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