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Electrochemical Neutralization Energy Assisted Low-Cost Acid-alkaline Electrolyzer for Energy-saving Electrolysis Hydrogen Generation

Abstract

The ability to reduce the energy consumed and the cost in water splitting is crucial for generation of hydrogen, which can be stored and then oxidized to deliver clean, abundant and sustainable energy with regenerating water. Here we report an asymmetric electrolyzer with three dimensional (3D) Ni2P Nanorod networks as bifunctional electrocatalysts for acidic cathode and alkaline anode that are separated by a bipolar membrane, such electrolyzer afford us with optimization in decreasing energy required and maximizing electrocatalysts: 1) pH gradient between anolyte and catholyte separated by bipolar membrane provides the electrolyzer with additional electrochemical neutralization energy for facilitating water splitting; 2) efficiency of electrocatalysts can be maximized by offsetting the well-known mismatch of optimal conditions for electrocatalyst between anode (normally alkaline) and cathode (generally acidic). Such unprecedented water electrolysis system can activate water splitting at an applied voltage of around 0.79 V that is significantly lower than the minimum theoretical voltage requirement (1.23 V), reducing electricity energy consumed by more than 35.8 %.

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Publication details

The article was received on 25 Nov 2017, accepted on 05 Jan 2018 and first published on 05 Jan 2018


Article type: Communication
DOI: 10.1039/C7TA10374C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Electrochemical Neutralization Energy Assisted Low-Cost Acid-alkaline Electrolyzer for Energy-saving Electrolysis Hydrogen Generation

    Y. Li, J. Chen, P. Cai and Z. Wen, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA10374C

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