Design and synthesis Zn doped CoP/Co2P nanowire arrays for boosting hydrogen generation reaction

Yang, Yuying; Zhu, Cuimei; Zhou, Yi; Zhang, Yan; Xie, Yandong; Lv, Liwen; Chen, Wenlian; He, Yuanyuan; Hu, Zhongai

doi:10.1016/j.jssc.2020.121231

Cited by 27 publications

(9 citation statements)

References 42 publications

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“…[398] Transition metal doping altered the H-coverage, and Mo doping was found to be the most effective at lowering the overpotential to 40 mV compared to pristine Ni 2 P 71 mV at 10 mA cm −2 in 1 m KOH solution (Figure 15c). Other metal dopants, such as Zn, [399] Ce, [400] W, [401,402] Er, [403] Mn [404][405][406] and Cu, [407] were also employed to seek enhancement in HER performance, as enlisted in Table 9.…”

Section: Electrocatalytic Applicationsmentioning

confidence: 99%

Transition Metal Non‐Oxides as Electrocatalysts: Advantages and Challenges

Das

Sinha

Roy

2022

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energy crisis. To satisfy this surging global energy demand, people often tend to use nonrenewable resources (coal, petroleum, natural gas, etc.), which generates an enormous amount of greenhouse gases, causing great obstacles for the development of a healthy human society. [1] To avoid such unhealthy environmental pollution, the use of renewable energy resources such as wind, solar, hydroelectric power, etc., over the past few years has served as the top priority to meet the global energy demand. The advancement of science and technology and the global realization of escalating energy demand have led the present generation to explore clean energy sources as future alternatives due to their easy accessibility and high energy density. [2,3] Consequently, in recent years, energy conversion technologies focusing on the conversion of renewable energies (wind, water, etc.) into easily stored chemical energy is attracting much attention. [4][5][6] The electrochemical splitting of water molecules to generate highly efficient hydrogen and oxygen is considered to be one of the promising methods for the generation of green hydrogen as a clean fuel alternative to fossil fuel. [7][8][9][10][11] Hydrogen, present in abundance, with zero carbon emissions and high energy yield, is considered an efficient energy carrier similar to electricity and batteries. The electrocatalytic process in an electrolyzer involves hydrogen generation at the cathode based on the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at the anode. [12,13] However, in practical applications, the largescale utilization of water electrolysis is seriously hindered due to the sluggish kinetics of OER and lack of stability of the electrocatalyst. [14] The sluggish reaction kinetics of OER are due to the four-electron transfer reaction, which requires overcoming a considerable amount of activation energy barrier corresponding to the breaking of the O-H bond and the formation of the O-O double bond, unlike HER, involving only two electron-transfer reactions. On the other hand, the oxygen reduction reaction (ORR), as a very important part of fuel cell applications, also requires four electron transfer pathways to dissociate the O-O double bond with slow reaction kinetics. To overcome the sluggish kinetics of OER, diverse studies have been devoted to designing electrocatalysts to facilitate the process. Undoubtedly, noble metal (Ru, Ir)-based electrocatalysts well served in minimizing the required activation energy, The identification of hydrogen as green fuel in the near future has stirred global realization toward a sustainable outlook and thus boosted extensive research in the field of water electrolysis focusing on the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). A huge class of compounds consisting of transition metalbased nitrides, carbides, chalcogenides, phosphides, and borides, which can be collectively termed transition metal non-oxides (TMNOs), has emerged recently as an ef...

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Section: Electrocatalytic Applicationsmentioning

confidence: 99%

Transition Metal Non‐Oxides as Electrocatalysts: Advantages and Challenges

Das

Sinha

Roy

2022

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“…Anjum et al [ 55 ] studied sulfur-doped cobalt phosphide electrocatalysts and concluded that their performance is better than all-noble-metal electrocatalysts in alkaline electrolyzers for overall water splitting. Yang et al [ 56 ] synthesized Zn-doped CoP nanowire arrays for boosting hydrogen generation, and they found the overpotential of Zn-doped CoP was two times lower than undoped CoP. Zhang et al [ 57 ] also reported that Ga dopant could enhance the activity of CoP.…”

Section: Resultsmentioning

confidence: 99%

Theoretical Study of Hydrogen Production from Ammonia Borane Catalyzed by Metal and Non-Metal Diatom-Doped Cobalt Phosphide

et al. 2022

Molecules

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The decomposition of ammonia borane (NH3BH3) to produce hydrogen has developed a promising technology to alleviate the energy crisis. In this paper, metal and non-metal diatom-doped CoP as catalyst was applied to study hydrogen evolution from NH3BH3 by density functional theory (DFT) calculations. Herein, five catalysts were investigated in detail: pristine CoP, Ni- and N-doped CoP (CoPNi-N), Ga- and N-doped CoP (CoPGa-N), Ni- and S-doped CoP (CoPNi-S), and Zn- and S-doped CoP (CoPZn-S). Firstly, the stable adsorption structure and adsorption energy of NH3BH3 on each catalytic slab were obtained. Additionally, the charge density differences (CDD) between NH3BH3 and the five different catalysts were calculated, which revealed the interaction between the NH3BH3 and the catalytic slab. Then, four different reaction pathways were designed for the five catalysts to discuss the catalytic mechanism of hydrogen evolution. By calculating the activation energies of the control steps of the four reaction pathways, the optimal reaction pathways of each catalyst were found. For the five catalysts, the optimal reaction pathways and activation energies are different from each other. Compared with undoped CoP, it can be seen that CoPGa-N, CoPNi-S, and CoPZn-S can better contribute hydrogen evolution from NH3BH3. Finally, the band structures and density of states of the five catalysts were obtained, which manifests that CoPGa-N, CoPNi-S, and CoPZn-S have high-achieving catalytic activity and further verifies our conclusions. These results can provide theoretical references for the future study of highly active CoP catalytic materials.

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“…The peak at ∼775 eV originated from the Co LMM Auger peak. The existence of Co–P and P–M bonds suggests the presence of phosphide phase in O–Co 1 –x Fe x P y . , Figure d shows the deconvoluted high-resolution XPS Fe 2p spectra of O–Co 1 –x Fe x P y . The binding energies of the Fe 2p 3/2 peak at 710.5 eV and the Fe 2p 1/2 peak at 722.1 eV match Fe(III). , Compared to O–Co 2 P, the Co 2p peaks in O–Co 1 –x Fe x P y show a positive shift, and the shift in the binding energies of the Fe 2p 3/2 peaks is also observed for O–Co 1 –x Fe x P y .…”

Section: Resultsmentioning

confidence: 99%

Iron and Oxygen Codoped Cobalt Phosphide Solvothermally Prepared from a Metal–Organic Framework for Oxygen Evolution

et al. 2022

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The preparation of highly active and low-cost electrocatalysts is a major challenge for water electrolysis. Here, iron and oxygen codoped cobalt phosphide nanoparticles (O− Co 1−x Fe x P y , x = 0−0.42) are prepared by reacting metal−organic framework with phosphorus under solvothermal conditions. When electrochemically catalyzing the oxygen evolution reaction (OER) in 1 M KOH, O−Co 0.58 Fe 0.42 P y supported on the nickel foam exhibits the best activity, with only 232 mV overpotential to reach 10 mA cm −2 OER current densities. O−Co 0.58 Fe 0.42 P y is robust toward the long-term OER, and surface phosphide layers transform to (oxy)hydroxides during the OER. O−Co 1−x Fe x P y also shows better OER activity than Co 3 O 4 nanoparticles and commercial IrO 2 . The abundant electrochemically active sites exposed by the highly porous morphology and the electron interactions between Co and Fe that accelerate the OER intermediate adsorption process could account for the observed high OER activity.

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Design and synthesis Zn doped CoP/Co2P nanowire arrays for boosting hydrogen generation reaction

Cited by 27 publications

References 42 publications

Transition Metal Non‐Oxides as Electrocatalysts: Advantages and Challenges

Transition Metal Non‐Oxides as Electrocatalysts: Advantages and Challenges

Theoretical Study of Hydrogen Production from Ammonia Borane Catalyzed by Metal and Non-Metal Diatom-Doped Cobalt Phosphide

Iron and Oxygen Codoped Cobalt Phosphide Solvothermally Prepared from a Metal–Organic Framework for Oxygen Evolution

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