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Fuel Cell Electric Vehicles (FCEVs) have garnered significant attention for their eco-friendliness, offering a promising solution to address the challenges posed by greenhouse gas emissions from gasoline and diesel-powered vehicles. These vehicles utilize fuel cell technology to convert hydrogen gas into electricity, producing only water vapor and heat as byproducts. Despite their potential, FCEVs face hurdles in achieving their intended market share targets. This paper focuses on exploring the market growth of FCEVs and the role of government incentives in this context. The study delves into the dynamics between automakers, who invest in research, development, and production of FCEVs, and hydrogen suppliers, responsible for producing and supplying hydrogen at hydrogen refueling stations (HRSs). A decentralized model using the Stackelberg game approach is employed, considering the profits of each stakeholder as the main equation to derive decentralized variables. Various government incentives are examined, including subsidies for the operating and capital costs of automakers and hydrogen suppliers, along with tax credits for FCEVs. By analyzing these incentives, their impacts on the growth of the FCEV market are evaluated. The paper seeks to identify the potential reasons for the shortfall in achieving the FCEV market share target and propose viable solutions for the identified problems. Ultimately, this research aims to shed light on the significance of government support and industry collaboration in fostering the widespread adoption of fuel cell electric vehicles and achieving a sustainable, low-emission transportation system. [ABSTRACT FROM AUTHOR]