Abstract
The water oxidation is the limiting step in the water-splitting process. Given this scenario, the development of new catalysts is essential in this field. The emergent demand is the use of Earth-abundant elements and catalysts with high performance under mild conditions. Because of this, catalysts such as Prussian Blue analogues (PBA) have been receiving a lot of attention in recent years. In addition, working under neutral conditions allows us to take advantage of the modification of conductive polymeric 3D printed electrodes (3DPE) with Prussian Blue. Thus, we described in this work the development of the polymeric 3D printed electrodes modified by cobalt-Prussian Blue and their performance in the water oxidation process. The 3D printed electrodes modified with Co3[Co(CN)6]2 (Co-Co PBA) have a Tafel slope of 343 mV dec−1 while those modified with Co3[Fe(CN)6]2 (Co-Fe PBA) have a Tafel slope of 378 mV dec−1. This means that both catalysts have the same mechanism for the water oxidation process. On the other hand, the overpotential of Co-Co PBA in 3DPE is lower than the value observed by Co-Fe PBA in 3DPE suggesting the best electrocatalytic activity for Co-Co PBA catalyst.
Highlights
Our society is going through a huge transition in terms of the energy matrix
In order to solve this limitation, to modulate the electrocatalytic response and take advantage of the modification of the 3D printed electrodes (3DPE) under mild conditions, we reported the development of the 3DPE modified by cobalt-Prussian Blue and their performance in the water oxidation process
The prepared Co-Co Prussian Blue analogues (PBA) has a pink color which indicates the presence of the hydrated form[45] and its spectrum consists of three main bands in the 300-900 nm range that can be assigned to ligand field (LF) transitions
Summary
Fossil fuels have been the driving force of the last two centuries due to their abundance, density of energy, processing technology and, especially, the price.[1] the emission of CO2 and other greenhouse gases, such as CH4, N2O and chlorofluorocarbons (CFCs), increased substantially and is contributing to the heating of the planet.[2] There are a lot of options to minimize the problem, but the consensus is the urgency in the development of new sources of clean and renewable energy.[3,4,5]. Nature gives us countless sources of energy and the challenges are how to convert, store and use them. Among these available options, water splitting can be highlighted by the fact that it is possible to produce hydrogen from water. The byproduct of the combustion or reaction with oxygen is water. The limiting step of water splitting is the oxidation of water to molecular oxygen
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