Synergistic coupling of NiFeZn-OH nanosheet network arrays on a hierarchical porous NiZn/Ni heterostructure for highly efficient water splitting

نویسندگان

چکیده

Efficient and economical electrocatalysts should be developed for oxygen evolution reaction (OER) hydrogen (HER) to split water an extensive application prospect of green clean energy. Here, we develop highly efficient OER HER through the scalable fabrication NiFeZn hydroxide nanosheets firmly arrayed on a hierarchical porous intermetallic NiZn Ni heterojunction over nickel foam (NiFeZn-OH/NiZn-Ni/NF). One bimodal intermetallic/Ni layer is in situ constructed surface maximize exposure catalytic sites build firm NiFeZn-OH via redox with FeCl3. NiFeZn-OH/NiZn-Ni/NF shows low overpotentials η50/600 around 235/284 mV 73/212 HER, small Tafel slopes 46.1 41.1 dec−1, prolonged durability alkaline medium because strong synergistic effects Zn doping, multiple interface engineering, integral three-dimensional free-standing scaffold. As bifunctional catalysts, required electrolytic voltage 1.49 V at 20 mA cm−2 (1.61 100 cm−2) sustained stable output 40 h during splitting. This work might provide insights into exploration low-cost intermetallic/multimetallic heterostructured practical overall

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ژورنال

عنوان ژورنال: Science China. Materials

سال: 2021

ISSN: ['2095-8226', '2199-4501']

DOI: https://doi.org/10.1007/s40843-021-1926-9