| # | Title | Journal | Year | Citations |
|---|
| 1 | A comprehensive review on PEM water electrolysis | International Journal of Hydrogen Energy | 2013 | 3,509 |
| 2 | Metal hydride materials for solid hydrogen storage: A review☆ | International Journal of Hydrogen Energy | 2007 | 2,915 |
| 3 | Hydrogen energy, economy and storage: Review and recommendation | International Journal of Hydrogen Energy | 2019 | 1,804 |
| 4 | Hydrogen production by biological processes: a survey of literature | International Journal of Hydrogen Energy | 2001 | 1,732 |
| 5 | Review of the proton exchange membranes for fuel cell applications | International Journal of Hydrogen Energy | 2010 | 1,696 |
| 6 | Review and evaluation of hydrogen production methods for better sustainability | International Journal of Hydrogen Energy | 2015 | 1,666 |
| 7 | Hydrogen production for energy: An overview | International Journal of Hydrogen Energy | 2020 | 1,441 |
| 8 | Photo-electrochemical hydrogen generation from water using solar energy. Materials-related aspects | International Journal of Hydrogen Energy | 2002 | 1,385 |
| 9 | Biohydrogen production: prospects and limitations to practical application | International Journal of Hydrogen Energy | 2004 | 1,297 |
| 10 | Progress of electrochemical capacitor electrode materials: A review | International Journal of Hydrogen Energy | 2009 | 1,280 |
| 11 | Future cost and performance of water electrolysis: An expert elicitation study | International Journal of Hydrogen Energy | 2017 | 1,240 |
| 12 | Hydrogen futures: toward a sustainable energy system | International Journal of Hydrogen Energy | 2002 | 1,197 |
| 13 | A review on reforming bio-ethanol for hydrogen production | International Journal of Hydrogen Energy | 2007 | 1,061 |
| 14 | Potential importance of hydrogen as a future solution to environmental and transportation problems | International Journal of Hydrogen Energy | 2008 | 1,046 |
| 15 | Hydrogen storage in Mg: A most promising material | International Journal of Hydrogen Energy | 2010 | 953 |
| 16 | Hydrogen from renewable electricity: An international review of power-to-gas pilot plants for stationary applications | International Journal of Hydrogen Energy | 2013 | 907 |
| 17 | Biological hydrogen production; fundamentals and limiting processes | International Journal of Hydrogen Energy | 2002 | 866 |
| 18 | Ammonia and related chemicals as potential indirect hydrogen storage materials | International Journal of Hydrogen Energy | 2012 | 852 |
| 19 | Green methods for hydrogen production | International Journal of Hydrogen Energy | 2012 | 841 |
| 20 | The properties of hydrogen as fuel tomorrow in sustainable energy system for a cleaner planet | International Journal of Hydrogen Energy | 2005 | 838 |
| 21 | The hydrogen-fueled internal combustion engine: a technical review | International Journal of Hydrogen Energy | 2006 | 806 |
| 22 | A review on the current progress of metal hydrides material for solid-state hydrogen storage applications | International Journal of Hydrogen Energy | 2016 | 789 |
| 23 | Efficiency of solar water splitting using semiconductor electrodes | International Journal of Hydrogen Energy | 2006 | 786 |
| 24 | Factors influencing fermentative hydrogen production: A review | International Journal of Hydrogen Energy | 2009 | 785 |
| 25 | Sustainable fermentative hydrogen production: challenges for process optimisation | International Journal of Hydrogen Energy | 2002 | 780 |
| 26 | The future of hydrogen – opportunities and challenges☆ | International Journal of Hydrogen Energy | 2009 | 775 |
| 27 | Hydrogen the fuel for 21st century | International Journal of Hydrogen Energy | 2009 | 763 |
| 28 | “Green” path from fossil-based to hydrogen economy: An overview of carbon-neutral technologies | International Journal of Hydrogen Energy | 2008 | 759 |
| 29 | The hydrogen economy in the 21st century: a sustainable development scenario | International Journal of Hydrogen Energy | 2003 | 745 |
| 30 | Hydrogen production by methane decomposition: A review | International Journal of Hydrogen Energy | 2010 | 740 |
| 31 | Bipolar plates for PEM fuel cells: A review | International Journal of Hydrogen Energy | 2005 | 738 |
| 32 | Review of bipolar plates in PEM fuel cells: Flow-field designs | International Journal of Hydrogen Energy | 2005 | 727 |
| 33 | Towards the hydrogen economy? | International Journal of Hydrogen Energy | 2007 | 713 |
| 34 | Large-scale storage of hydrogen | International Journal of Hydrogen Energy | 2019 | 703 |
| 35 | Review of hydrogen storage techniques for on board vehicle applications | International Journal of Hydrogen Energy | 2013 | 701 |
| 36 | Hydrogen storage and delivery: Review of the state of the art technologies and risk and reliability analysis | International Journal of Hydrogen Energy | 2019 | 684 |
| 37 | Hydrogen from hydrocarbon fuels for fuel cells | International Journal of Hydrogen Energy | 2001 | 683 |
| 38 | Hydrogen production from agricultural waste by dark fermentation: A review | International Journal of Hydrogen Energy | 2010 | 679 |
| 39 | Overview on the application of direct methanol fuel cell (DMFC) for portable electronic devices | International Journal of Hydrogen Energy | 2009 | 678 |
| 40 | Comparative assessment of hydrogen production methods from renewable and non-renewable sources | International Journal of Hydrogen Energy | 2014 | 665 |
| 41 | Modeling of advanced alkaline electrolyzers: a system simulation approach | International Journal of Hydrogen Energy | 2003 | 644 |
| 42 | Advances in biological hydrogen production processes | International Journal of Hydrogen Energy | 2008 | 644 |
| 43 | A safe, portable, hydrogen gas generator using aqueous borohydride solution and Ru catalyst | International Journal of Hydrogen Energy | 2000 | 641 |
| 44 | Solar hydrogen production via a two-step water-splitting thermochemical cycle based on Zn/ZnO redox reactions | International Journal of Hydrogen Energy | 2002 | 638 |
| 45 | From hydrocarbon to hydrogen?carbon to hydrogen economy | International Journal of Hydrogen Energy | 2005 | 637 |
| 46 | Power to gas: Technological overview, systems analysis and economic assessment for a case study in Germany | International Journal of Hydrogen Energy | 2015 | 629 |
| 47 | Hydrogen from biomass – Present scenario and future prospects | International Journal of Hydrogen Energy | 2010 | 618 |
| 48 | Electrocatalysts for hydrogen evolution reaction | International Journal of Hydrogen Energy | 2017 | 613 |
| 49 | Review of electrochemical ammonia production technologies and materials | International Journal of Hydrogen Energy | 2013 | 611 |
| 50 | The survey of key technologies in hydrogen energy storage | International Journal of Hydrogen Energy | 2016 | 611 |
