Transition Metal Oxides: The Material of Choice for Heterogeneous Catalysis

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy Science and Technology".

Deadline for manuscript submissions: closed (30 October 2019) | Viewed by 5571

Special Issue Editors


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Guest Editor
Institute of Chemistry of New Materials, Universität Osnabrück, Barbarastrasse 7, 49076 Osnabrück, Germany
Interests: heterogenous catalysis; electrocatalysis; water-splitting; energy conversion; inorganic chemistry; materials chemistry

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Guest Editor
Biology Groups, School of Natural Sciences, Hull University, Hull HU6 7RX, UK
Interests: behavioral ecology and ecophysiology; aquaculture and pest control applications of chemical ecology; ecotoxicology; marine invertebrates reproductive; sensory physiology

Special Issue Information

Dear Colleagues,

The limited availability and environmental impacts of using fossil-based energy sources as primary energy is increasingly forcing engineers and scientists to develop techniques that allow to extract electric energy from alternative sources including solar energy. Electrochemically initiated water splitting allows the conversion of electricity into hydrogen plus oxygen thus the combination of both techniques potentially represents an environmentally friendly and potentially commercially exploitable solar to fuel conversion pathway provided that the electrocatalysts are non-toxic, highly efficient and based on cost-efficient and earth abundant elements.

Transition metal oxides (TMO) including Fe-, Ni-, Co- and Mn-oxides fulfill these requirements and can be created on conductive substrates. Despite recent progress in the exploitation of TMOs as water splitting catalysts there exist significant challenges to improve the overall properties, and to enable wider, practical applications of TMOs in heterogeneous catalysis. This special Issue, is designed to promote publications of new research and technological developments on transition metal-oxide based materials suitable to serve as highly efficient heterogenous catalysts. We invite contributions on topics that include, but is not limited to, alternative energy conversion and storage techniques.

Dr. Helmut Schäfer
Dr. Jorg. D. Hardege
Guest Editors

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Keywords

  • Transition metal oxides
  • Electrocatalysis
  • Water Splitting
  • Oxygen evolution reaction
  • Hydrogen evolution reaction
  • Methanol oxidation
  • Selective conversion of organic compound
  • Fischer Tropsch catalysts
  • Steam reforming
  • Heterogenous catalysis

Published Papers (1 paper)

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Research

9 pages, 2798 KiB  
Article
Nanosheets of CuCo2O4 As a High-Performance Electrocatalyst in Urea Oxidation
by Camila Zequine, Fangzhou Wang, Xianglin Li, Deepa Guragain, S.R. Mishra, K. Siam, P. K. Kahol and Ram K. Gupta
Appl. Sci. 2019, 9(4), 793; https://doi.org/10.3390/app9040793 - 24 Feb 2019
Cited by 28 | Viewed by 5115
Abstract
The urea oxidation reaction (UOR) is a possible solution to solve the world’s energy crisis. Fuel cells have been used in the UOR to generate hydrogen with a lower potential compared to water splitting, decreasing the costs of energy production. Urea is abundantly [...] Read more.
The urea oxidation reaction (UOR) is a possible solution to solve the world’s energy crisis. Fuel cells have been used in the UOR to generate hydrogen with a lower potential compared to water splitting, decreasing the costs of energy production. Urea is abundantly present in agricultural waste and in industrial and human wastewater. Besides generating hydrogen, this reaction provides a pathway to eliminate urea, which is a hazard in the environment and to people’s health. In this study, nanosheets of CuCo2O4 grown on nickel foam were synthesized as an electrocatalyst for urea oxidation to generate hydrogen as a green fuel. The synthesized electrocatalyst was characterized using X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. The electroactivity of CuCo2O4 towards the oxidation of urea in alkaline solution was evaluated using electrochemical measurements. Nanosheets of CuCo2O4 grown on nickel foam required the potential of 1.36 V in 1 M KOH with 0.33 M urea to deliver a current density of 10 mA/cm2. The CuCo2O4 electrode was electrochemically stable for over 15 h of continuous measurements. The high catalytic activities for the hydrogen evolution reaction make the CuCo2O4 electrode a bifunctional catalyst and a promising electroactive material for hydrogen production. The two-electrode electrolyzer demanded a potential of 1.45 V, which was 260 mV less than that for the urea-free counterpart. Our study suggests that the CuCo2O4 electrode can be a promising material as an efficient UOR catalyst for fuel cells to generate hydrogen at a low cost. Full article
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