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Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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A Supramolecular Coordination-Polymer-Derived Electrocatalyst for the Oxygen Evolution Reaction.

Chi Zhang¹, Chen Zhang², Yunchao Xie¹

¹Department of Mechanical & Aerospace Engineering, University of Missouri, Columbia, Missouri, 65211, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|November 16, 2018

Summary

A novel iron oxide and nickel iron alloy hybrid on porous graphene demonstrates superior performance for the oxygen evolution reaction (OER). This advanced electrocatalyst offers high activity and durability, outperforming current standards.

Keywords:

electrocatalysis laser induced graphene oxygen evolution reaction polymers supramolecular chemistry

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Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

The oxygen evolution reaction (OER) is crucial for energy conversion technologies like water splitting.
Developing efficient and durable electrocatalysts is essential to overcome OER's kinetic limitations.
Current state-of-the-art catalysts, such as RuO2, face challenges related to cost and stability.

Purpose of the Study:

To synthesize and characterize a novel hybrid electrocatalyst based on iron oxide decorated nickel iron alloy nanoparticles supported on porous graphene.
To evaluate the electrocatalytic activity and durability of the hybrid material for the oxygen evolution reaction.
To compare the performance of the developed catalyst against state-of-the-art OER electrocatalysts.

Main Methods:

Synthesis of iron oxide decorated nickel iron alloy nanoparticles.
Integration of nanoparticles with porous graphene to form a hybrid material.
Electrochemical characterization using techniques such as cyclic voltammetry and chronoamperometry to assess OER performance.

Main Results:

The hybrid electrocatalyst exhibited high electrocatalytic activity for OER.
A low overpotential of 274 mV at 10 mA cm⁻² and a low Tafel slope of 37 mV dec⁻¹ were recorded.
The material demonstrated excellent durability, surpassing the performance of RuO2.

Conclusions:

The iron oxide decorated nickel iron alloy nanoparticle/porous graphene hybrid is a highly effective electrocatalyst for OER.
The synergistic effect between the alloy nanoparticles, iron oxide decoration, and porous graphene contributes to enhanced catalytic performance.
This novel material presents a promising alternative to existing OER electrocatalysts for energy applications.