Controlled synthesis of Mo-doped Ni<sub>3</sub>S<sub>2</sub>nano-rods: an efficient and stable electro-catalyst for water splitting

Cui, Zheng; Ge, Yuancai; Chu, Hang; Baines, Robert; Dong, Pei; Tang, Jianhua; Yang, Yang; Ajayan, Pulickel M.; Ye, Mingxin; Shen, Jianfeng

doi:10.1039/c6ta09853c

Cited by 158 publications

(78 citation statements)

References 67 publications

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“…The Mo‐doped porous NiCo 2 O 4 /Co 5.47 N nanosheet array coated on nickel foam (denoted as Mo‐NiCo 2 O 4 /Co 5.47 N/NF) is obtained by pyrolysis of a trimetallic metal–organic framework (TMOF) nanosheet array grown on NF ( Figure ). Specifically, Mo is chosen as a dopant due to its important role in reducing the chemisorption free energy of both hydrogen and oxygen containing intermediates, and thus accelerating electrocatalytic process . The unique structure of Mo‐NiCo 2 O 4 /Co 5.47 N/NF brings balanced electronic structure and highly exposed active site, leading to a binder‐free electrode with superior electrocatalytic performance.…”

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confidence: 99%

Non‐3d Metal Modulation of a 2D Ni–Co Heterostructure Array as Multifunctional Electrocatalyst for Portable Overall Water Splitting

Liu

Yin

et al. 2020

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Portable water splitting devices driven by rechargeable metal–air batteries or solar cells are promising, however, their scalable usages are still hindered by lack of suitable multifunctional electrocatalysts. Here, a highly efficient multifunctional electrocatalyst is demonstrated, i.e., 2D nanosheet array of Mo‐doped NiCo2O4/Co5.47N heterostructure deposited on nickel foam (Mo‐NiCo2O4/Co5.47N/NF). The successful doping of non‐3d high‐valence metal into a heterostructured nanosheet array, which is directly grown on a conductive substrate endows the resultant catalyst with balanced electronic structure, highly exposed active sites, and binder‐free electrode architecture. As a result, the Mo‐NiCo2O4/Co5.47N/NF exhibits remarkable catalytic activity toward the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), affording high current densities of 50 mA cm−2 at low overpotentials of 310 mV for OER, and 170 mV for HER, respectively. Moreover, a low voltage of 1.56 V is achieved for the Mo‐NiCo2O4/Co5.47N/NF‐based water splitting cell to reach 10 mA cm−2. More importantly, a portable overall water splitting device is demonstrated through the integration of a water‐splitting cell and two Zn–air batteries (open‐circuit voltage of 1.43 V), which are all fabricated based on Mo‐NiCo2O4/Co5.47N/NF, demonstrating a low‐cost way to generate fuel energy. This work offers an effective strategy to develop high‐performance metal‐doped heterostructured electrode.

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confidence: 99%

Non‐3d Metal Modulation of a 2D Ni–Co Heterostructure Array as Multifunctional Electrocatalyst for Portable Overall Water Splitting

Liu

Yin

et al. 2020

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“…[47][48][49] Clearly,t he peaks of Mo 3d 5/2 and Mo 3d 3/2 were shiftedt oh igherb inding energy owing to the existence of strong electronic interactions between Ni 3 S 2 and MoS 2 . [38,[57][58][59] Figure 2e shows the high-resolution XPS Ni 2p spectrum obtained for the 0.2-A@NF sample. [38,[57][58][59] Figure 2e shows the high-resolution XPS Ni 2p spectrum obtained for the 0.2-A@NF sample.…”

Section: Resultsmentioning

confidence: 99%

Hatted 1T/2H‐Phase MoS₂ on Ni₃S₂ Nanorods for Efficient Overall Water Splitting in Alkaline Media

Wei

Wang

et al. 2020

Chemistry A European J

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An ew hatted 1T/2H-phaseM oS 2 on Ni 3 S 2 nanorods, as ab ifunctionale lectrocatalyst for overall water splitting in alkaline media, is prepared through as imple one-pot hydrothermals ynthesis. The hat-rod structurei sc omposed mainly of Ni 3 S 2 ,w ith 1T/2H-MoS 2 adhered to the top of the growth.A queousa mmonia plays an importantr ole in forming the 1T-phaseM oS 2 by twisting the 2H-phase transition and expanding the interlayer spacing throught he intercalation of NH 3 /NH 4 + .O wing to the special "hat-like" structure, the electronsc onduct easily from Ni foam along Ni 3 S 2 to MoS 2 ,a nd the catalyst particles maintain sufficient contact with the electrolyte, with gaseous molecules produced by waters plitting easily removedf rom the surface of the catalyst. Thus, the electrocatalytic performance is enhanced, with an overpotential of 73 mV,aTa fel slope of 79 mV dec À1 ,a nd excellent stability,a nd the OER demonstrates an overpotential of 190 mV and Tafel slope of 166 mV dec À1 .

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“…However, such a composite has rarely been reported as yet. On the other hand, the sample area of the ever‐reported OER catalysts is usually smaller than 9.0 cm 2 due to the possible synthesis difficulty or the little effort on increasing the sample size, which is far from the requirement for future industrial applications. The synthesis of high‐efficient OER catalysts with an even larger sample size still remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

MoFe‐Codoped Ni₃S₂/Ni(OH)₂ Nanosheets with Large Sample Size toward High‐Performance Oxygen Evolution

Xie

Tong²,

Zhang

et al. 2019

Energy Tech

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Efficient, stable, and scalable oxygen evolution reaction (OER) electrocatalysts are highly needed for industrial hydrogen production. Herein, MoFe‐codoped Ni3S2/Ni(OH)2 nanosheets with a sample size area of 200 cm2 are established on Ni foam via a facial hydrothermal method. It is found that Fe3+ and MoO42− are effectively doped into the Ni3S2/Ni(OH)2 nanosheets that are composed by heazlewoodite Ni3S2 and β‐Ni(OH)2 nanocrystals. Based on the systematic study on the non‐, Fe‐, Mo‐, and MoFe‐doped Ni3S2/Ni(OH)2 composites, it is revealed that Fe3+ and MoO42− play important roles in reducing the interfacial charge transfer and increasing the electrochemical active surface area, respectively. When doping at a MoFe molar ratio of 5/3, the synergistic effect of Fe and Mo leads to an optimum OER property with low overpotentials of η100 (263 mV) and η500 (301 mV), Tafel plot of 52 mV dec−1, and long durability for at least 24 h. An effective strategy for high‐efficiency, long‐durability, and nonprecious OER electrocatalysts with promising applications is provided.

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Controlled synthesis of Mo-doped Ni₃S₂nano-rods: an efficient and stable electro-catalyst for water splitting

Abstract: Fabrication of stable, efficient, and inexpensive bifunctional electro-catalysts for water splitting has become increasingly attractive.

Cited by 158 publications

References 67 publications

Non‐3d Metal Modulation of a 2D Ni–Co Heterostructure Array as Multifunctional Electrocatalyst for Portable Overall Water Splitting

Non‐3d Metal Modulation of a 2D Ni–Co Heterostructure Array as Multifunctional Electrocatalyst for Portable Overall Water Splitting

Hatted 1T/2H‐Phase MoS₂ on Ni₃S₂ Nanorods for Efficient Overall Water Splitting in Alkaline Media

MoFe‐Codoped Ni₃S₂/Ni(OH)₂ Nanosheets with Large Sample Size toward High‐Performance Oxygen Evolution

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Controlled synthesis of Mo-doped Ni3S2nano-rods: an efficient and stable electro-catalyst for water splitting

Abstract: Fabrication of stable, efficient, and inexpensive bifunctional electro-catalysts for water splitting has become increasingly attractive.

Cited by 158 publications

References 67 publications

Non‐3d Metal Modulation of a 2D Ni–Co Heterostructure Array as Multifunctional Electrocatalyst for Portable Overall Water Splitting

Non‐3d Metal Modulation of a 2D Ni–Co Heterostructure Array as Multifunctional Electrocatalyst for Portable Overall Water Splitting

Hatted 1T/2H‐Phase MoS2 on Ni3S2 Nanorods for Efficient Overall Water Splitting in Alkaline Media

MoFe‐Codoped Ni3S2/Ni(OH)2 Nanosheets with Large Sample Size toward High‐Performance Oxygen Evolution

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Controlled synthesis of Mo-doped Ni₃S₂nano-rods: an efficient and stable electro-catalyst for water splitting

Hatted 1T/2H‐Phase MoS₂ on Ni₃S₂ Nanorods for Efficient Overall Water Splitting in Alkaline Media

MoFe‐Codoped Ni₃S₂/Ni(OH)₂ Nanosheets with Large Sample Size toward High‐Performance Oxygen Evolution