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Alloying-Triggered Phase Engineering of NiFe System via Laser-Assisted Al Incorporation for Full Water Splitting |
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| Authors: | Xiaoyu Liu Haolin Lu Prof. Shengli Zhu Prof. Zhenduo Cui Prof. Zhaoyang Li Prof. Shuilin Wu Prof. Wence Xu Prof. Yanqin Liang Prof. Guankui Long Prof. Hui Jiang |
| Affiliation: | 1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300350 China;2. School of Materials Science and Engineering, Tianjin Key Lab for Rare Earth Materials and Applications, Renewable Energy Conversion and Storage Center (RECAST), Nankai University, Tianjin, 300350 China;3. School of Materials Science and Engineering, Tianjin University, Tianjin, 300350 China Tianjin Key Laboratory of Composite and Functional Materials, Tianjin, 300350 China Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin, 300350 China;4. School of Materials Science and Engineering, Tianjin University, Tianjin, 300350 China Tianjin Key Laboratory of Composite and Functional Materials, Tianjin, 300350 China Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin, 300350 China School of Materials Science & Engineering, Peking University, Beijing, 100871 China |
| Abstract: | It is challenging to design one non-noble material with balanced bifunctional performance for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) for commercial sustainability at a low cost since the different electrocatalytic mechanisms are not easily matchable for each other. Herein, a self-standing hybrid system Ni18Fe12Al70, consisting of Ni2Al3 and Ni3Fe phases, was constructed by laser-assisted aluminum (Al) incorporation towards full water splitting. It was found that the incorporation of Al could effectively tune the morphologies, compositions and phases. The results indicate that Ni18Fe12Al70 delivers an extremely low overpotential to trigger both HER (η100=188 mV) and OER (η100=345 mV) processes and maintains a stable overpotential for 100 h, comparable to state-of-the-art electrocatalysts. The synergistic effect of Ni2Al3 and Ni3Fe alloys on the HER process is confirmed based on theoretical calculation. |
| Keywords: | Incorporation NiAl NiFe Water Splitting the Synergistic Effect |