Porous Pd/NiFeO_x Nanosheets Enhance the pH-Universal Overall Water Splitting

Zhang Wen; Jiang Xue; Dong ZemengWang JingZhang NingLiu JieXu Guang-RuiWang Lei

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Porous Pd/NiFeO_x Nanosheets Enhance the pH-Universal Overall Water Splitting

机译：Porous Pd/NiFeO_x Nanosheets Enhance the pH-Universal Overall Water Splitting

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Modulating the morphology and chemical composition is an efficient strategy to enhance the catalytic activity for water splitting, since it is still a great challenge to develop a bifunctional catalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) over a wide pH range. Herein, Pd/NiFeOx nanosheets are synthesized with tightly arranged petal nanosheets and uniform mesoporous structure on nickel foam (NF). The porous 2D structure yields a larger surface area and exposes more active sites, facilitating water splitting at all pH values. The overpotential of Pd/NiFeOx nanosheets for OER is only 180, 169, and 310 mV in 1 m KOH, 0.5 m H2SO4, and 1 m phosphate-buffered saline (PBS) conditions at 10 mA cm(-2) current density, as well as excellent HER activity with ultralow overpotential in a wide pH range. When using porous Pd/NiFeOx nanosheets as bifunctional catalysts for water splitting, it just required a cell voltage of 1.57 V to reach a current density of 20 mA cm(-2) with nearly 100% faradic efficiency in alkaline conditions, which is much lower than that of benchmark Pt/CRuO2 (1.76 V) couples, along with the improving stability benefiting from the good corrosion resistance of the inner NiFeOx nanosheets.

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《Advanced functional materials》 |2021年第51期|2107181.1-2107181.11|共11页
作者
Zhang Wen; Jiang Xue; Dong ZemengWang JingZhang NingLiu JieXu Guang-RuiWang Lei;
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Qingdao Univ Sci & Technol, Team Eco Chem Proc & Technol, Taishan Scholar Advantage & Characterist Discipli, Key Lab Ecochem Engn,Key Lab Opt Elect Sensing &, Qingdao 266042, Peoples R China|Qingdao Univ Sci & Technol, Coll Chem Engn, Qingdao 266042, Peop;

Qingdao Univ Sci & Technol, Team Eco Chem Proc & Technol, Taishan Scholar Advantage & Characterist Discipli, Key Lab Ecochem Engn,Key Lab Opt Elect Sensing &, Qingdao 266042, Peoples R China|Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266042;

Qingdao Univ Sci & Technol, Team Eco Chem Proc & Technol, Taishan Scholar Advantage & Characterist Discipli, Key Lab Ecochem Engn,Key Lab Opt Elect Sensing &, Qingdao 266042, Peoples R China|Qingdao Univ Sci & Technol, Sch Mat Sci & Engn, Qingdao 266042,;

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2D porous nanosheets; bifunctional electrocatalysts; oxygen evolution reaction; water splitting; wide pH range;

Porous Pd/NiFeO_x Nanosheets Enhance the pH-Universal Overall Water Splitting

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