Controlled Hydrolysis of a Nickel–Ammonia Complex on Pt Nanoparticles for the Preparation of Highly Active and Stable PtNi/C Catalysts,Industrial & Engineering Chemistry Research

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Controlled Hydrolysis of a Nickel–Ammonia Complex on Pt Nanoparticles for the Preparation of Highly Active and Stable PtNi/C Catalysts
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-11-18 , DOI: 10.1021/acs.iecr.1c02975
Hao Wu ₁ , Huichi Zhong ₁ , Yingzhi Pan ₁ , Huibin Li ₁ , Jianhuang Zeng _{1,

2}

Affiliation

Thermal annealing at high temperatures is usually employed to alloy Pt with transitional metals to produce Pt-based electrocatalysts in an oxygen reduction reaction for polymer exchange membrane fuel cells. How to curb thermal annealing induced aggregation and sintering has been a major concern in post-treatment. Here we developed an optimized impregnation method by controlled hydrolysis of a nickel–ammonia complex on Pt/C via dropwise addition of NaOH to form homogeneously dispersed catalyst precursors. These precursor powders are then subjected to thermal annealing and subsequent acidic leaching to produce alloyed A-PtNi/C catalysts. A-PtNi/C displayed a high mass activity (MA) and specific activity (SA) of 0.903 A mg_Pt^–1@0.9 V and 2.36 mA cm^–2, respectively. In addition, the electrochemical surface area (ECSA) and MA only suffered losses of 3 and 33%, respectively, after an accelerated durability test. Both activity and stability of A-PtNi/C far exceed the 2020 Department of Energy target set for ORR catalysts.

中文翻译：

Pt纳米颗粒上镍-氨络合物的可控水解制备高活性和稳定的PtNi/C催化剂

高温热退火通常用于将 Pt 与过渡金属合金化，以在聚合物交换膜燃料电池的氧还原反应中生产 Pt 基电催化剂。如何抑制热退火引起的聚集和烧结一直是后处理的主要问题。在这里，我们开发了一种优化的浸渍方法，通过滴加 NaOH 在 Pt/C 上控制水解镍 - 氨络合物以形成均匀分散的催化剂前体。然后对这些前体粉末进行热退火和随后的酸浸以生产合金 A-PtNi/C 催化剂。A-PtNi/C 的质量活度 (MA) 和比活度 (SA) 为 0.903 A mg _Pt^–1 @0.9 V 和 2.36 mA cm ^–2，分别。此外，在加速耐久性试验后，电化学表面积 (ECSA) 和 MA 分别仅损失 3% 和 33%。A-PtNi/C 的活性和稳定性都远远超过了能源部为 ORR 催化剂设定的 2020 年目标。

更新日期：2021-11-18

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