Global warming and the accelerating depletion of fossil-based fuels have catalysed a tremendous surge in the development of alternative and sustainable energy sources e.g. wind, solar and hydropower. Due to the deep penetration of these renewable energy technologies and the UK carbon incentive of providing almost 80% of energy through renewables by 2050 [1], it is required that the surplus energy to be stored. Apart from storing excess energy into battery and other forms, storing hydrogen as energy by electrolysis of water is of recent interest. This is due to the development of new and high...