Utilizing in-situ polymerization of pyrrole to fabricate composited hollow nanospindles for boosting oxygen evolution reaction

[Display omitted] •A novel inorganic/polymer composited hollow nanospindles (FeNi-PPy HNSs) was fabricated via an in-situ polymerization of pyrrole.•The fabrication of hollow structures and polymerization of pyrrole were completed in one step.•The PPy could be combined with the Fe-Ni (oxy)hydroxides...

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Published in:	Applied catalysis. B, Environmental Environmental, 2020-10, Vol.274, p.119112, Article 119112
Main Authors:	Chen, Yixin, Shen, Lin, Wang, Congcong, Feng, Siyang, Zhang, Nan, Xiang, Siyuan, Feng, Tanglue, Yang, Mingxi, Zhang, Kai, Yang, Bai
Format:	Article
Language:	eng
Subjects:	Electrocatalysts Electrochemical oxygen evolution reaction Energy of dissociation Fabrication Free energy Heat of formation High temperature Hollow nanostructrues Hydroxides In-situ polymerization Iron Metal-organic framework Nickel Oxidation Oxygen Oxygen evolution reactions Polymerization Polymers Polypyrroles
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Summary:	[Display omitted] •A novel inorganic/polymer composited hollow nanospindles (FeNi-PPy HNSs) was fabricated via an in-situ polymerization of pyrrole.•The fabrication of hollow structures and polymerization of pyrrole were completed in one step.•The PPy could be combined with the Fe-Ni (oxy)hydroxides effectively to form metal-N coordinate bonds which can improve the activity of OER. The fabrication of electrocatalysts with excellent activity for oxygen evolution reaction is still a challenge, due to the high energy barriers of OER which is a four-electron-transfer process. Here we designed a novel inorganic/polymer composited hollow nanospindles consist of polypyrrole (PPy) and Fe-Ni (oxy)hydroxides (FeNi-PPy HNSs) by in-situ polymerization on MIL-88(FeNi) because of the strong oxidation of Fe3+. FeNi-PPy HNSs could be used as electrocatalyst for OER directly, and high temperature sintering is not necessary. To achieve 10 and 100 mA·cm−2, the FeNi-PPy HNSs only need low overpotential of 227 and 273 mV, respectively. As shown in results of DFT, profiting from the in-situ polymerization, the metal-N coordinate bonds could enhance the performance for OER by reducing the dissociation energy of OH- and promoting the adsorption of OH- in (oxy)hydroxide. This in-situ polymerization method on MOFs to fabricate hollow nanostructures would be a potential pathway to construct highly efficient electrocatalysts.
ISSN:	0926-3373 1873-3883