Electrodeposition of NiFe-layered double hydroxide layer on sulfur-modified nickel molybdate nanorods for highly efficient seawater splitting.

Autor: Wang H; Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science (Ministry of Education), State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China., Chen L; Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science (Ministry of Education), State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China., Tan L; Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science (Ministry of Education), State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China., Liu X; Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science (Ministry of Education), State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China., Wen Y; Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science (Ministry of Education), State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China., Hou W; Key Laboratory of Colloid & Interface Chemistry (Ministry of Education), Shandong University, Jinan 250100, China., Zhan T; Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science (Ministry of Education), State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China. Electronic address: trzhan@qust.edu.cn.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2022 May; Vol. 613, pp. 349-358. Date of Electronic Publication: 2022 Jan 10.
DOI: 10.1016/j.jcis.2022.01.044
Abstrakt: Developing high-efficiency and earth-abundant electrocatalysts for electrochemical seawater-splitting is of great significance but remains a grand challenge due to the presence of high-concentration chloride. This work presents the synthesis of a three-dimensional core-shell nanostructure with an amorphous and crystalline NiFe-layered double hydroxide (NiFe-LDH) layer on sulfur-modified nickel molybdate nanorods supported by porous Ni foam (S-NiMoO 4 @NiFe-LDH/NF) through hydrothermal and electrodeposition. Benefiting from high intrinsic activity, plentiful active sites, and accelerated electron transfer, S-NiMoO 4 @NiFe-LDH/NF displays an outstanding bifunctional catalytic activity toward oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in both simulated alkaline seawater and natural seawater electrolytes. To reach a current density of 100 mA cm -2 , this catalyst only requires overpotentials of 273 and 315 mV for OER and 170 and 220 mV for HER in 1 M KOH + 0.5 M NaCl freshwater and 1 M KOH + seawater electrolytes, respectively. Using S-NiMoO 4 @NiFe-LDH as both anode and cathode, the electrolyzer shows superb overall seawater-splitting activity, and respectively needs low voltages of 1.68 and 1.73 V to achieve a current density of 100 mA cm -2 in simulated alkaline seawater and alkaline natural seawater electrolytes with good Cl - resistance and satisfactory durability. The electrolyzer outperforms the benchmark IrO 2 ||Pt/C pair and many other reported bifunctional catalysts and exhibits great potential for realistic seawater electrolysis.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Databáze: MEDLINE
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