气候变化领域集成服务门户(CCPortal): Cable-like Ru/WNO@C nanowires for simultaneous high-efficiency hydrogen evolution and low-energy consumption chlor-alkali electrolysis

CCPortal

DOI	10.1039/c9ee01647c
	Cable-like Ru/WNO@C nanowires for simultaneous high-efficiency hydrogen evolution and low-energy consumption chlor-alkali electrolysis
	Zhang L.-N.; Lang Z.-L.; Wang Y.-H.; Tan H.-Q.; Zang H.-Y.; Kang Z.-H.; Li Y.-G.
发表日期	2019
ISSN	17545692
起始页码	2569
结束页码	2580
卷号	12 期号:8
英文摘要	The rational design of high-efficiency and stable hydrogen evolution electrocatalysts under the condition of strong alkali is the key issue for the combination of hydrogen production with low-energy consumption chlor-alkali electrolysis. Herein, ultra-small Ru nanoclusters anchored on WNO nanowires covered by few-layer N-doped carbon (named Ru/WNO@C) were synthesized through a simple pyrolysis method. We demonstrate a comprehensive understanding of the hydrogen evolution reaction (HER) performance of such cable-like Ru/WNO@C electrocatalysts by combining experimental and computational techniques. The optimal catalyst Ru/WNO@C (Ru wt% = 3.37%) delivers a record-low overpotential of 2 mV at a current density of 10 mA cm-2, a low Tafel slope of 33 mV dec-1, a high mass activity of 4095.6 mA mg-1 at an overpotential of 50 mV, and long-term durability in 1 M KOH. The superior HER activity of Ru/WNO@C is revealed to be caused by two factors using density functional theory (DFT) calculations: a moderate H adsorption free energy (ΔGH∗ = -0.21 eV) and a rather low water dissociation barrier (ΔGB = 0.27 eV). Specifically, Ru/WNO@C (Ru wt% = 3.37%) shows more remarkable HER performance than industrial low carbon steel under a simulated chlor-alkali electrolyte at 90 °C, making it an efficient cathode candidate applied in chlor-alkali electrolysis. Finally, a homemade ionic membrane electrolyzer with a Ru/WNO@C (Ru wt% = 3.37%) (-)//RuO2/IrO2-coated Ti-mesh (+) couple presents a low cell voltage of 2.48 V at a current density of 10 mA cm-2, which is 320 mV lower than the value for the low carbon steel (-)//RuO2/IrO2-coated Ti-mesh (+) (2.8 V) couple, exhibiting robust stability for 25 h. This work provides a meaningful reference for the design and fabrication of efficient and stable alkaline HER catalysts, and realizes high-efficiency hydrogen production and low-energy consumption chlor-alkali electrolysis at the same time. © The Royal Society of Chemistry 2019.
英文关键词	Cables; Computation theory; Density functional theory; Design for testability; Doping (additives); Electrocatalysts; Electrolysis; Electrolytes; Energy efficiency; Energy utilization; Free energy; Low carbon steel; Mesh generation; Nanowires; Potassium hydroxide; Chlor-alkali electrolysis; Computational technique; Hydrogen evolution; Hydrogen evolution reactions; Long term durability; Low energy consumption; Optimal catalysts; Robust stability; Hydrogen production; electrokinesis; energy efficiency; energy use; experimental design; experimental study; nanoparticle; nanotechnology
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189849
作者单位	Key Laboratory of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, China; Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, 215123, China
推荐引用方式 GB/T 7714	Zhang L.-N.,Lang Z.-L.,Wang Y.-H.,et al. Cable-like Ru/WNO@C nanowires for simultaneous high-efficiency hydrogen evolution and low-energy consumption chlor-alkali electrolysis[J],2019,12(8).
APA	Zhang L.-N..,Lang Z.-L..,Wang Y.-H..,Tan H.-Q..,Zang H.-Y..,...&Li Y.-G..(2019).Cable-like Ru/WNO@C nanowires for simultaneous high-efficiency hydrogen evolution and low-energy consumption chlor-alkali electrolysis.Energy & Environmental Science,12(8).
MLA	Zhang L.-N.,et al."Cable-like Ru/WNO@C nanowires for simultaneous high-efficiency hydrogen evolution and low-energy consumption chlor-alkali electrolysis".Energy & Environmental Science 12.8(2019).