Summary Depletion of earth's petroleum resources, greenhouse gas emissions, and global warming issues are caused by the conventional vehicles around the globe. In recent years, automotive industries focus on emerging alternative energy sources to mitigate the relying on fossil fuels so as to reduce global harmful emissions. Researchers have focused on the different aspects of hybrid and battery electric vehicles, such as energy management, regenerative braking control, and architecture of power electronics. This paper emphasizes on review of various energy management systems (EMSs) based on fuel cell hybrid electric vehicles (FCHEV) in combination with two secondary energy storage systems like batteries and ultracapacitors to provide high‐performance energy storage system. The performance of the FC–battery–ultracapacitor with various types of energy management schemes and experimental investigations is reported in this paper. This paper provides various braking control schemes to alleviate the hydrogen utilization of an FCHEV in connection with batteries and ultracapacitors and furthermore gives thorough investigation of FCHEV on their energy utilization, configuration, and EMSs developed by different analysts. This study focuses on energy allocation schemes, experimental approaches, recovery of regeneration, and EMS for next generation hybrid electric vehicles.

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Fuel cells technologies are the most promising green energy technologies for diverse applications. One of the fastest growing areas is the portable electronic applications where the power range is the order of 1–100 W. For most of the portable electronic devices, rechargeable battery is the major energy source. Due to limitations like limited capacity, requirement of external power for recharge have led many researchers to look for alternative power sources to power portable electronic devices. The high energy density of fuel cells makes them very attractive alternative to batteries for portable power applications. There are a variety of fuel cell technologies being considered to replace batteries in portable electronic equipment. Direct Liquid Fuel Cells (DLFCs) have attracted much attention due to their potential applications as a power source for portable electronic devices. The advantages of DLFCs over hydrogen fed PEM fuel cells include a higher theoretical energy density and efficiency, a more convenient handling of the streams, and enhanced safety. Unlike batteries, fuel cells need not be recharged, merely refueled. This paper provides an overview on challenges of DLFCs (Direct Liquid Fuel Cells), like fuel crossover, cost, durability, water management, weight and size along with approaches being investigated to solve these challenges. Portable Fuel Cell Commercialization Targets for future and producers of portable fuel cells across the globe are also discussed in this paper.

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The design of flow field greatly influences Proton Exchange Membrane Fuel Cell (PEMFC) performance, as it not only distributes the reactants, also removes the product (water) from the cell. Improper water removal blocks the reaction sites, which results in mass transport losses. A complete 3-D numerical model of PEMFC with a single serpentine (1-S), double serpentine (2-S),triple serpentine (3-S) and 3-2-1 serpentine flow fields with round corner was designed with the help of commercial Computational Fluid Dynamics (CFD) code ANSYS FLUENT. Simulations were carried out to investigate the effect of four flow fields on distribution of pressure, mass fraction of H2, O2, current flux density distribution, water content of membrane, and liquid water activity in the flow channels as well as the functioning of cells. Performance properties of proposed four designs were evaluated and found that 3-2-1 serpentine flow field performance is better than the 1-S, 2-S, and 3-S flow fields for the given flow rates of reactants and this 3-2-1 serpentine flow field model was validated with literature experimental data. The results also show that the velocity in channels increases with a decrease in the number of flow passes, which improve the reactions in the catalyst layers, reaction product removal from the cell thus reduces the concentration losses and improves the cell performance.

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