Highly improved electrocatalytic activity of NiSx: Effects of Cr-doping and phase transition

Liu, Dong; Tong, Rui; Qu, Yuanju; Zhu, Qing; Zhong, Xiongwei; Fang, Mingliang; Lo, K.H.; Zhang, Feifei; Ye, Yinchao; Tang, Yuxin; Chen, Shi; Xing, Guichuang; Pan, Hui

doi:10.1016/j.apcatb.2020.118721

Cited by 78 publications

(29 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…NF is used as the conductive support owing to its high surface area, good electrical conductivity, and low cost. [ 6a,16 ] The micromorphology of as‐prepared sample was observed by a typical scanning electron microscopy (SEM) (Figures S1 and S2, Supporting Information). The surface of pure commercial NF with acid‐treatment is rough (Figure S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Surface Reconstruction and Phase Transition on Vanadium–Cobalt–Iron Trimetal Nitrides to Form Active Oxyhydroxide for Enhanced Electrocatalytic Water Oxidation

Liu

et al. 2020

Advanced Energy Materials

Self Cite

186

136

View full text Add to dashboard Cite

However, the sluggish kinetics of oxygen evolution reaction (OER) in the electrolysis of water dramatically hinders its development for practical applications. [3] One of the challenges is to develop electrocatalysts with low-cost, abundance, high stability, and high catalytic activity for OER. Noble-metal oxides (such as IrO 2 and RuO 2) are most widely employed as efficient OER catalysts, but their scarcity and high cost limit their commercial application. [4] Therefore, tremendous efforts have been devoted to exploring low-cost earthabundant metals and their compounds for high-efficient and stable OER. [5] Nonprecious transition metal-based compounds, such as sulfides, [4c,6] (oxy)hydroxides, [4a,7] oxides, [4b,8] and phosphides, [4b,9] have been reported for OER owing to their tunable electronic structures and abundant active sites. Recently, 3d transition metal nitrides (TMNs) have been recognized to be promising for the OER process, which are superior to oxides, hydroxides, and sulfides, because of high electrical conductivity and enriched active sites. [10] It should be noted here that the surfaces of TMNs are easily oxidized into oxides and hydroxides. For example, the surface of catalyst was converted to metal oxyhydroxide (*OOH) owing to fast surface reconstruction and phase transition during the electrochemical The sluggish oxygen evolution reaction (OER) is a pivotal process for renewable energy technologies, such as water splitting. The discovery of efficient, durable, and earth-abundant electrocatalysts for water oxidation is highly desirable. Here, a novel trimetallic nitride compound grown on nickel foam (CoVFeN @ NF) is demonstrated, which is an ultra-highly active OER electrocatalyst that outperforms the benchmark catalyst, RuO 2 , and most of the state-of-the-art 3D transition metals and their compounds. CoVFeN @ NF exhibits ultralow OER overpotentials of 212 and 264 mV at 10 and 100 mA cm −2 in 1 m KOH, respectively, together with a small Tafel slop of 34.8 mV dec −1. Structural characterization reveals that the excellent catalytic activity mainly originates from: 1) formation of oxyhydroxide species on the surface of the catalyst due to surface reconstruction and phase transition, 2) promoted oxygen evolution possibly activated by peroxo-like (O 2 2−) species through a combined lattice-oxygen-oxidation and adsorbate escape mechanism, 3) an optimized electronic structure and local coordination environment owing to the synergistic effect of the multimetal system, and 4) greatly accelerated electron 1. Introduction Developing renewable and ecofriendly energy sources/technologies is urgently required to address environmental pollution and energy crisis. [1] Electrically driven water splitting for the production of hydrogen and oxygen has been considered as one

show abstract

Section: Resultsmentioning

confidence: 99%

Surface Reconstruction and Phase Transition on Vanadium–Cobalt–Iron Trimetal Nitrides to Form Active Oxyhydroxide for Enhanced Electrocatalytic Water Oxidation

Liu

et al. 2020

Advanced Energy Materials

Self Cite

186

136

View full text Add to dashboard Cite

show abstract

“…This process entails substantial effort in discovering breakthrough electrolytes and electrodes that are low cost, efficient, long-lasting, and stable. Hydrogen evolution reaction (HER) is an excellent route to produce high purity (≈ 100%) hydrogen from water electrolysis [ 5 , 6 ]. Therefore, an ideal catalyst must have high stability and be present to start proton reduction with minimum over potential and large cathodic current densities, which leads to enhancing the HER efficiency [ 7 – 10 ].…”

Section: Introductionmentioning

confidence: 99%

Molybdenum Disulfide Nanosheets Decorated with Platinum Nanoparticle as a High Active Electrocatalyst in Hydrogen Evolution Reaction

et al. 2022

View full text Add to dashboard Cite

Electrochemical hydrogen evolution reaction (HER) refers to the process of generating hydrogen by splitting water molecules with applied external voltage on the active catalysts. HER reaction in the acidic medium can be studied by different mechanisms such as Volmer reaction (adsorption), Heyrovsky reaction (electrochemical desorption) or Tafel reaction (recombination). In this paper, facile hydrothermal methods are utilized to synthesis a high-performance metal-inorganic composite electrocatalyst, consisting of platinum nanoparticles (Pt) and molybdenum disulfide nanosheets (MoS2) with different platinum loading. The as-synthesized composite is further used as an electrocatalyst for HER. The as-synthesized Pt/Mo-90-modified glassy carbon electrode shows the best electrocatalytic performance than pure MoS2 nanosheets. It exhibits Pt-like performance with the lowest Tafel slope of 41 mV dec−1 and superior electrocatalytic stability in an acidic medium. According to this, the HER mechanism is related to the Volmer-Heyrovsky mechanism, where hydrogen adsorption and desorption occur in the two-step process. According to electrochemical impedance spectroscopy analysis, the presence of Pt nanoparticles enhanced the HER performance of the MoS2 nanosheets because of the increased number of charge carriers transport.

show abstract

“…Moreover, the peak intensity of S 2p due to SO decreases after electrochemical stability testing. This is caused by the reduction effect during the electrochemical stability testing . Meanwhile, the active material film of both samples is also covered on nickel foam (Figure S6a,b).…”

mentioning

confidence: 94%

“…This is caused by the reduction effect during the electrochemical stability testing. 43 Meanwhile, the active material film of both samples is also covered on nickel foam (Figure S6a,b). However, Sample 1 shows honeycomb-like shape morphology, while the film with stacked particles becomes dense.…”

mentioning

confidence: 96%

“…This phenomenon reveals that the amorphous crystal structure of Sample 2 remained stable before and after the reaction, while the amorphous crystal structure of the Sample 1 changes before and after the reaction. Due to the random arrangements of atoms, the amorphous structure can afford a low-energy barrier, contributing partly to the high electrochemical performance of the as-prepared nickel/nickel sulfide composite films. , Hence, the stability of Sample 2 keeps constant (Figure e,f), while that of Sample 1 presents obvious degeneration at the end of the test. Finally, the enhanced Ni content of Sample 2 reduces charge resistance and optimizes the electronic structure, and the amorphous crystal structure of Sample 2 can be retained, which can contribute to fast electron transport and keep remarkable electrocatalytic activity and stability.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Facile Electrodeposition of Amorphous Nickel/Nickel Sulfide Composite Films for High-Efficiency Hydrogen Evolution Reaction

Miao

Zheng

Sun

et al. 2021

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Low-cost preparation of high-efficiency electrocatalysts is challenging the development of electrocatalytic water splitting. Here, amorphous nickel/nickel sulfide composite films with controlled Ni content are prepared directly on nickel foam by adopting the reductant during a facile electrodeposition route, functioning as active hydrogen evolution electrocatalysts. By adopting the reductant during the electrodeposition process, the content of Ni increases in the as-prepared nickel/nickel sulfide composite film, deducing from an energy-dispersive spectrometer. As a result of increased Ni to the optimal ratio, the amorphous nickel/nickel sulfide composite film exhibits remarkable electrocatalytic performance, benefiting possibly the modulated electronic structure, the reduced charge resistance, and the higher effectively electrochemical surface area. In a word, the optimal electrocatalyst presents an excellent catalytic stability and exhibits a small Tafel slope of 79.9 mV•dec −1 and low overpotentials of 43.8 and 134.5 mV to deliver current densities of 10 and 100 mA•cm −2 , respectively. The low-cost preparation of the high-efficiency amorphous nickel/nickel sulfide composite film here suggests that the adopted facile electrodeposition method may provide a feasible route for the fabrication of next-generation high-efficiency electrocatalysts for practical applications.

show abstract

Highly improved electrocatalytic activity of NiSx: Effects of Cr-doping and phase transition

Cited by 78 publications

References 61 publications

Surface Reconstruction and Phase Transition on Vanadium–Cobalt–Iron Trimetal Nitrides to Form Active Oxyhydroxide for Enhanced Electrocatalytic Water Oxidation

Surface Reconstruction and Phase Transition on Vanadium–Cobalt–Iron Trimetal Nitrides to Form Active Oxyhydroxide for Enhanced Electrocatalytic Water Oxidation

Molybdenum Disulfide Nanosheets Decorated with Platinum Nanoparticle as a High Active Electrocatalyst in Hydrogen Evolution Reaction

Facile Electrodeposition of Amorphous Nickel/Nickel Sulfide Composite Films for High-Efficiency Hydrogen Evolution Reaction

Contact Info

Product

Resources

About