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Published on: June 21, 2017
Room-Temperature Synthesis of Amorphous Fe-Doped Nickel Phosphate for High-Efficiency Alkaline Seawater Oxidation
Deshuang Xu1, Chenxi Zhang1, Yun Liu1
1Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710127, China.
Abstract:
The construction of an efficient and durable oxygen evolution reaction (OER) electrocatalyst through a simple synthesis strategy is crucial for the hydrogen produced from seawater splitting. However, achieving this goal remains a great challenge. Herein, the synthesis of amorphous Fe-doped nickel phosphate (Fe-NixPO4) as a high-performance OER electrocatalysts for alkaline freshwater/seawater splitting is presented using a straightforward co-precipitation method at room-temperature. Experimental results reveal the structural reconstruction of Fe-NixPO4 into Fe-doped NiOOH decorated with PO4 3-. The collaborative interplay between Ni2+ and Fe3+, along with the decoration of PO4 3-, can effectively modulate the electronic environment of the electrocatalyst. Consequently, the optimized Fe-NixPO4 exhibits exceptional OER activity, requiring overpotentials of 359 and 422 mV to generate 1000 mA cm-2 in alkaline freshwater and alkaline seawater, respectively. Moreover, Fe-NixPO4 also displays outstanding stability for 100 h at 100 mA cm-2 in alkaline seawater. This research presents a viable approach for fabricating OER electrocatalysts with exceptional efficiency for seawater electrolysis.
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