Hydrogen and Oxygen Production via Water Electrolysis

Water electrolysis is the electrochemical process of splitting water ($H_{2}O$) into hydrogen ($H_2$) and oxygen ($O_2$) gases using an electric current.[1] This reaction occurs within a device known as an electrolyzer, which consists of an anode and a cathode separated by an electrolyte.[2] In a Polymer Electrolyte Membrane (PEM) electrolyzer, water reacts at the anode to form oxygen and protons ($H^{+}$); the protons migrate across the membrane to the cathode, where they combine with electrons to produce hydrogen gas.[1] [3] The fundamental chemical equations for this process are: Anode: $2H_{2}O\to O_2+4H^{+}+4e^{-}$ Cathode: $4H^{+}+4e^{-}\to 2H_2$ [1]

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Benefits of Hydrogen and Oxygen Injection in Crop Soils

The periodic injection of hydrogen and oxygen into living plant soil, often delivered via hydrogen-rich water (HRW) or nanobubbles, provides significant physiological advantages for crop development and stress resilience.[4] [5] Hydrogen gas acts as a novel signaling molecule that modulates the antioxidant capacity of plant cells, helping to neutralize reactive oxygen species (ROS) such as the hydroxyl radical ($\cdot OH$) and peroxynitrite ($ONO{O}^{-}$).[5] [6] This reduction in oxidative stress is particularly beneficial when crops are exposed to environmental stressors like salinity, heavy metal toxicity (e.g., cadmium or mercury), and extreme temperatures.[5] [7]

Enhanced Growth and Nutrient Uptake

Hydrogen application has been shown to stimulate root elongation and increase the dry weight of various crops, including rice and alfalfa.[5] [8] In saline conditions, hydrogen treatments help plants maintain a better $N{a}^{+}/K^{+}$ ratio by promoting sodium extrusion through the activation of SOS1-like transport proteins.[5] Furthermore, oxygenation of the rhizosphere—the soil area surrounding the roots—prevents hypoxia (oxygen deficiency), which is a common issue in compacted or waterlogged soils.[2] [9] Increased oxygen availability supports aerobic respiration in root cells, leading to more efficient nutrient uptake and overall plant vigor.[2]

Postharvest Preservation and Disease Resistance

Beyond the growth phase, hydrogen treatments applied during cultivation can improve the postharvest shelf life of fruits and vegetables.[5] [10] Research indicates that hydrogen-treated crops, such as kiwifruit and tomatoes, exhibit delayed senescence, maintained firmness, and reduced rot.[5] [11] These effects are often linked to the modulation of phytohormones like ethylene and the enhancement of heme oxygenase-1 (HO-1) activity, which further bolsters the plant's internal defense mechanisms against pathogens.[5] [12]