A key challenge for the effective adoption of hydrogen technology is safety. There are significant safety risks in using and storing hydrogen; H2 is 14x lighter than air, it is odourless, it is colourless and importantly H2/air mixtures can readily ignite over significant distances. The rapid detection of H2 leaks is imperative to ensure that there is sufficient public confidence and that the technology becomes acceptable. Typically, hydrogen sensors are used to detect H2 leaks. This technology it is well established but would unsuitable for emerging hydrogen technology markets given their cost. Additionally, a method for sensing hydrogen leaks, either through smell (or sight) would beneficial in increasing public confidence in hydrogen technology. Odour agents are typically unpleasant smelling organic compounds added to an odourless gas that when detected by the human nose provoke alarm. Natural gas is odourless, but we immediately recognise a leak from the smell of an odour agent added to the natural gas, tert-butylthiol. This signals an immediate alarm, as well as providing assurance that we can effectively sense the leak if required. However, unlike natural gas, odour additives used for hydrogen use and storage has significant limitations. Firstly, typical aliphatic sulphur and nitrogen based odour agents can impact the catalysts used within fuel cells; and secondly, the odour agents must be non-toxic given the use of hydrogen gas in domestic markets. This project will design and synthesize new odour additives for hydrogen storage, and then benchmark them against the current industry standard(s). Their will be three elements to this project (1) synthetic chemistry modification of the recently divulged sulphur and nitrogen free method using acrylate/acetophenone (antioxidant) system;(2) the development aromatic thiophene and derivatives, where their structures can be modified to reduce (or eliminate) catalyst poisoning in fuel cells; and (3) use of carbon rich saturated readily available natural products (e.g. longifolene). This latter element of the project goes against existing paradigms in odours additives, but we believe these substrates remain underutilised as potential odorants, particularly given they are aliphatic and contain limited functional groups that could potentially poison a catalyst with a fuel cell. The implementation of the results from this project will provide novel odour agents that can be used in hydrogen storage. By delivering a cost-effective method for hydrogen detection, public confidence in hydrogen technology will be enhance. This should see an increased uptake of hydrogen technology by business, thereby reducing reliance on fossil fuel use leading to decarbonisation of the economy. Additionally, a more cost-effective safety platform should see hydrogen technology becoming more available to developing economies and emerging markets.