Large-scale synthesis of low-cost bimetallic polyphthalocyanine for highly stable water oxidation

过电位 双金属片 析氧 电负性 催化作用 材料科学 化学工程 分解水 纳米技术 电化学 化学 电极 物理化学 有机化学 光催化 工程类
作者
Qianglong Qi,Jue Hu,Sitian Guo,Hongchuan Song,Shixing Wang,Yaochun Yao,Thiquynhxuan Le,Li Wei,Chengxu Zhang,Libo Zhang
出处
期刊:Applied Catalysis B-environmental [Elsevier BV]
卷期号:299: 120637-120637 被引量:69
标识
DOI:10.1016/j.apcatb.2021.120637
摘要

Although large-scale synthesis of inexpensive and efficient electrocatalysts for oxygen evolution reaction (OER) is critical for industrial water splitting, little attention has been paid to that. Here, FeCo-bimetallic polyphthalocyanine (FeCo-PPc) with ultra-low-cost of less than $0.1 per gram and excellent OER electrocatalytic performance has been prepared in kilogram-scale for the first time. The FeCo-PPc catalyst, around 1/5000th times lower the cost of the commercial IrO2, exhibits 24 times higher turnover frequency (0.417 s−1 at 300 mV) and much lower the overpotential (308 mV at 500 mA cm−2) than that of IrO2 (0.0177 s−1 and 588 mV, respectively). Moreover, the FeCo-PPc catalyst shows outstanding long-term stability under an industrial condition (6 M KOH and 85℃) at the high current densities of 100 mA cm−2 and 500 mA cm−2. The excellent OER activity can be attributed to the electron interaction between Fe and Co and the electronegativity of N atoms, which regulate the electron cloud density of neighboring atoms and form active sites to promote the adsorption of reactants. Our work may guide rational design and large-scale synthesis of electrocatalysts that work well at high current densities in industrial conditions.
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