电催化剂
磷腈
过电位
催化作用
杂原子
材料科学
析氧
聚合物
化学工程
可逆氢电极
无机化学
化学
电极
物理化学
电化学
有机化学
复合材料
工作电极
工程类
戒指(化学)
作者
Pandiaraj Sekar,Nithya Murugesh,Ramasamy Shanmugam,Sunil Kumar,Stefano Agnoli,Narendraraj Chandran,Seenuvasan Vedachalam,Ramasamy Karvembu
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-08-25
卷期号:4 (9): 9341-9352
被引量:14
标识
DOI:10.1021/acsaem.1c01550
摘要
Developing nonprecious metal-based electrocatalysts to convert water into green fuels (H2 and O2) is key to address urgent climate and energy challenges. We have prepared an electrocatalyst by the immobilization of NiCo2O4 on a phosphazene-based covalent organic polymer (P-COP) through a facile hydrothermal method. The elemental composition of the P-COP showed the presence of a greater amount of heteroatoms N (6.62%) and P (5.62%) throughout the polymer support. Scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS) were utilized to determine the atomic structure of the nanocuboids, which depicted the formation of an inverse spinel structure. A NiCo2O4-P-COP-based electrode was simultaneously used for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), and it displayed a minimum overpotential of 270 and 130 mV (V vs RHE), respectively, at a current density of 10 mA cm–2. In addition, it acted as an oxygen reduction catalyst with a half-wave potential of 0.83 V (V vs RHE) and a maximum current density of 4.5 mA cm–2. The electrocatalytic activity is comparable with that of the commercially available Pt and RuO2 catalysts. The combined experimental and computational studies confirm that the catalytic centers formed through the interaction between the heteroatoms (N and P) in the phosphazene matrix and metal oxides (Co and Ni) play an important role in its improved durability and electrocatalytic activity.
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