Abstract
For sustainable and incremental growth, mankind is adopting renewable sources of energy along with storage systems. Storing surplus renewable energy in the form of hydrogen is a viable solution to meet continuous energy demands. In this paper the concept of electrochemical hydrogen storage in a solid multi-walled carbon nanotube (MWCNT) electrode integrated in a modified unitized regenerative fuel cell (URFC) is investigated. The method of solid electrode fabrication from MWCNT powder and egg white as an organic binder is disclosed. The electrochemical testing of a modified URFC with an integrated MWCNT-based hydrogen storage electrode is performed and reported. Galvanostatic charging and discharging was carried out and results analyzed to ascertain the electrochemical hydrogen storage capacity of the fabricated electrode. The electrochemical hydrogen storage capacity of the porous MWCNT electrode is found to be 2.47 wt%, which is comparable with commercially available AB5-based hydrogen storage canisters. The obtained results prove the technical feasibility of a modified URFC with an integrated MWCNT-based hydrogen storage electrode, which is the first of its kind. This is surelya step forward towards building a sustainable energy economy.
Highlights
Introduction and BackgroundFor many centuries, exhaustible fuels formed the basis of meeting most of the world’s energy demands
The aim of this paper is; to investigate experimentally the electrochemical hydrogen storage capacity of a solid multi-walled carbon nanotube (MWCNT)-based electrode when integrated in a modified unitized regenerative fuel cell (URFC) or proton battery
At 2.6 V, the charging process was stopped due to the sudden increment in increment in production of hydrogen gas, indicating that the storage was full
Summary
Exhaustible fuels formed the basis of meeting most of the world’s energy demands. The increasing concentrations of the greenhouse gases in the Earth’s atmosphere due to human activities has resulted in global warming and related climate change. Burning of fossil fuels is one of the major activities leading to the emission of greenhouse gases [2]. These reasons generate a need of transition from fossil fuels to renewable energy sources over the coming decades. One of the biggest challenges facing humankind over the few years is decreasing dependence on fossil fuels (such as natural gas) and their by-products and controlling the emission of greenhouse gases responsible for climate change
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