Porous Co2P nanowires as high efficient bifunctional catalysts for 4-nitrophenol reduction and sodium borohydride hydrolysis

Huang, Xingkai; Wu, Dengfeng; Cheng, Daojian

doi:10.1016/j.jcis.2017.08.024

Cited by 56 publications

(13 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the BE of Co 2p 3/2 is higher than that of metallic Co (777.9 eV) [41] and the P 2p 3/2 is lower than that of element P (130.2 eV). [16] This observation indicates that Co and P have a partially positive or negative shift, suggesting that electron transfers from Co to P. Interestingly, the BE of Adv. Energy Mater.…”

Section: Resultsmentioning

confidence: 97%

Vertical CoP Nanoarray Wrapped by N,P‐Doped Carbon for Hydrogen Evolution Reaction in Both Acidic and Alkaline Conditions

Huang

et al. 2019

Advanced Energy Materials

Self Cite

322

139

View full text Add to dashboard Cite

commercial application is significantly restricted due to the paucity and preciousness of Pt. Therefore, the exploration of high-efficient and earth-abundant materials is of great importance for the future of hydrogen economy, [6][7][8] and it is highly desirable to create a low-cost, robust, and high-active electrocatalyst for HER.In the last decade, abundant transition metal-based electrocatalysts have been reported as the promising alternatives to noble metals for HER, including transition metal chalcogenide, carbides, and nitrides, such as MoS 2 , [9] CoSe 2 , [10] W 2 C, [11] and MoN 4 . [12] In particular, transition metal phosphides (TMPs) have attracted considerable attention in HER, [13][14][15] where CoP has been regarded as one of the best candidates for HER. It has been demonstrated that P atoms in the TMPs can draw electrons from metal and serve as a proton-acceptor, [16,17] and the activity of this kind of catalyst severely depends on the microstructures of CoP. [18] Hence, great efforts have been made to fabricate different morphologies of CoP materials, such as nanoparticles, [19] nanowires, [20,21] nanosheets, [22,23] and nanotube. [24] However, some CoP nanorods or nanoparticles are vulnerable to agglomeration due to the large current density and long-term testing, resulting in degenerative stability and low electrocatalytic activity. [25] Accordingly, it is challengeable but more attractive to develop an electrocatalyst with robust stability and high activity.3D nanoarrays (NA) directly grown on the current collectors have been regarded as popular high-capability electrodes in the past few years. The advantages of 3D nanoarray can be mainly summarized as the following points: 1) The 3D nanostructures could accelerate the desorption of H 2 gas bubbles from catalyst surface and then improve the mass transfer. [26] 2) The 3D structures can avoid the aggregation of electrocatalysts caused by the high current and long-term testing. 3) The self-assembled electrodes possess prominent advantages than that required to be immobilized by polymer binder such as Nafion which will block active sites and inhibit diffusion. [27] In order to further enhance electrocatalytic performances and stability, an effective method is to wrap the nanorods array or nanoparticles (NPs) with carbon layers, which can protect the catalysts from the degradation and agglomeration at performance testing. [28] For Hydrogen evolution reaction (HER) is a key reaction in water splitting, and developing efficient and robust non-noble electrocatalysts for HER is still a great challenge for large-scale hydrogen production. Herein, a vertically aligned core-shell structure grown on Ti foil with CoP nanoarray as a core and N,P-doped carbon (NPC) as a shell (CoP/NPC/TF) is first reported as an efficient electrocatalyst for HER. Results indicate that CoP/NPC/TF only demands the overpotentials of 91 and 80 mV to drive the current density of 10 mA cm −2 in acidic and alkaline solutions. The electrochemical measurements and theoretical calcula...

show abstract

Section: Resultsmentioning

confidence: 97%

Vertical CoP Nanoarray Wrapped by N,P‐Doped Carbon for Hydrogen Evolution Reaction in Both Acidic and Alkaline Conditions

Huang

et al. 2019

Advanced Energy Materials

Self Cite

322

139

View full text Add to dashboard Cite

show abstract

“…A comparison of the present results with those previously reported in the literature is shown in Table 3. (Huang, Wu, and Cheng 2017) Nevertheless, the use of a renewable, three-dimensional support and the simple method of fabrication of spongin-based composites represent added value of the materials described here in comparison to other heterogeneous catalytic systems.…”

Section: Catalytic Activitymentioning

confidence: 99%

Commercial sponges in heterogeneous catalysis: developing novel composites with cobalt and silver

Żółtowska¹,

Modelska²,

Piasecki³

et al. 2020

Physicochem. Probl. Miner. Process.

View full text Add to dashboard Cite

The use of commercial sponges in materials science has gained much recent attention. Their unique properties, namely a fibrous, rigid skeleton, thermal stability and resistance to acid and basic hydrolysis, have been the primary motivation to use them in the development of new composites. In this work, a simple method of immobilization of cobalt and silver cations, followed by their reduction using sodium borohydride, was successfully applied for the first time to obtain functionalized spongin scaffolds. Three different materials, labeled Co_spongin, Ag_spongin and Co-Ag_spongin, were prepared. Their morphological and physicochemical properties were explored using various techniques (SEM+EDS, TG/DTA, FTIR). The focal point of the research was the application of the resulting materials in the reaction of 4-nitrophenol reduction with sodium borohydride in water. It was found that all of the composites possess superior activity in the reduction of 4-nitrophenol, achieving high rate constants of 0.31 min-1 for Ag_spongin, 0.52 min-1 for Co_spongin and 0.86 min-1 for Co-Ag_spongin. Reusability tests showed that all of the composites could be reused five times. Additional structural analysis after catalytic application showed no visible changes in the morphology of the catalysts. The results indicate that spongin can be considered as a facile, cost-effective, renewable and environmentally friendly three-dimensional support for use in heterogeneous catalysis.

show abstract

“…Therefore, a NaBH 4 concentration of 0.2 M could be used in further experiments. [44][45][46] It is well known that organic dyes have a high toxicity, including carcinogenic and mutagenic effects. They damage plants and animals and pose a threat to human health due to the difficulty of their biodegradation.…”

Section: Catalytic Reduction Of 4-np and Dyesmentioning

confidence: 99%

Hollow N‐ZIFs@NiCo‐LDH as highly efficient catalysts for 4‐nitrophenol and dyes

Lin

Duan

Zhao

2020

Applied Organom Chemis

View full text Add to dashboard Cite

N‐ZIF‐(1:0)@NiCo‐LDH, N‐ZIF‐(1:3.5)@NiCo‐LDH and N‐ZIF‐(0:1)@NiCo‐LDH were prepared by mixing solvents in various volume ratios (Vmethanol:Vwater = 1:0, 1:3.5 and 0:1) when synthesizing precursors. These composite materials were characterized using scanning and transmission electron microscopies, X‐ray diffraction, X‐ray photoelectron spectroscopy and nitrogen adsorption–desorption measurements, and investigated as catalysts for reduction of 4‐nitrophenol, methyl orange and methylene blue. The NaBH4 concentration as an important factor that may affect catalytic activity for reduction of 4‐nitrophenol was examined. Under optimal experimental conditions, the excellent catalytic activity of the N‐ZIF‐(0:1)@NiCo‐LDH composite, compared to that of N‐ZIF‐(1:0)@NiCo‐LDH and N‐ZIF‐(1:3.5)@NiCo‐LDH composites, could be attributed to the presence of graphitic nitrogen. In addition, compared with previously reported catalysts, all catalysts prepared show excellent catalytic activity owing to the unique structure exposing more active sites.

show abstract

Porous Co2P nanowires as high efficient bifunctional catalysts for 4-nitrophenol reduction and sodium borohydride hydrolysis

Cited by 56 publications

References 63 publications

Vertical CoP Nanoarray Wrapped by N,P‐Doped Carbon for Hydrogen Evolution Reaction in Both Acidic and Alkaline Conditions

Vertical CoP Nanoarray Wrapped by N,P‐Doped Carbon for Hydrogen Evolution Reaction in Both Acidic and Alkaline Conditions

Commercial sponges in heterogeneous catalysis: developing novel composites with cobalt and silver

Hollow N‐ZIFs@NiCo‐LDH as highly efficient catalysts for 4‐nitrophenol and dyes

Contact Info

Product

Resources

About