![]() On the contrary, no viable candidates are known to substitute noble-metal oxides such as IrO 2 at the anode where the oxygen evolution reaction (OER) takes place 1, 6, 9, 15, 16, 17, 18, 19, 20, 21. Several electrocatalysts based on low-cost raw materials have shown great promise to substitute the state-of-the-art platinum electrodes responsible for HER 6, 7, 11, 12, 13, 14. The catalysts responsible to improve the efficiency of the process, mainly relying on noble metals, are part of the high cost of the technology, and because of this, many laboratories in the world are working to find viable solutions to develop effective, earth-abundant, robust and scalable catalyst 5, 6, 7, 8.Īcidic electrolytes offer many advantages for hydrogen production, given that high H + concentration improves the hydrogen evolution reaction (HER), and also facilitates fast/low resistance ionic transport 9, 10. ![]() Electrochemical water splitting powered by renewable sources is regarded as the ideal future technology to produce hydrogen, but costs must be lowered to improve its market penetration 3, 4. However, hydrogen production is still dominated worldwide by natural gas steam reforming, a mature technology fixing a very low competitive price in the market. Hydrogen is considered the most environmentally friendly alternative fuel to replace traditional fossil energy 1, 2. ![]()
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