Ternary Ni2(1-x)Mo2xP nanowire arrays toward efficient and stable hydrogen evolution electrocatalysis under large-current-density

Luo, Yu; Mishra, Ishwar Kumar; Xie, Yunlong; Zhou, Haiqing; Zhou, Junqiang; Ni, Yizhou; Luo, Dan; Fang, Yu; Yu, Ying; Chen, Shuo; Ren, Zhifeng

doi:10.1016/j.nanoen.2018.08.025

Cited by 247 publications

(163 citation statements)

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“…Our MoS 2 / Ni 3 S 2 NW-NF has a Tafel slope of 58.9 mV dec -1 , indicating that the HER process follows the Volmer-Heyrovsky mechanism, where the electrochemical desorption of hydrogen is the ratedetermining step. This value is also lower than many NF-based catalysts, like MoS 2 /Ni 3 S 2 [21][22][23], Ni 3 S 2 [31], Ni 2 P-Ni 3 S 2 [32] and Ni@Co-Ni-P [33], except for Ni 2(1-x) Mo 2x P [27] and FeP/Ni 2 P [28] ( Fig. 3c and Table S1 (online)).…”

Section: Resultsmentioning

confidence: 73%

“…This comparison indicates that the electrochemical active materials in our catalyst are dominantly coaxial MoS 2 / Ni 3 S 2 NWs. Note that these values are much smaller than those of the reported MoS 2 /Ni 3 S 2 -NF materials (187 and 274, 110 and 200, 98 and 191 mV) [21][22][23] and many other NF-based catalysts (Table S1 online), including Ni 3 S 2 (135 and 225 mV) [31], Ni 2 P-Ni 3 S 2 heteronanoflake arrays (80 and~160 mV) [32] and Ni 2(1-x) Mo 2x P (72 and 162 mV) [27]. Moreover, the overpotential for current density of 100 mA cm À2 is close to that of Pt/C-NF (110 mV).…”

Section: Resultsmentioning

confidence: 78%

“…Nevertheless, most studies generally focus on low current density such as 10 and 100 mA cm À2 . Currently, only a few heterostructure electrocatalysts in-situ grown on metal electrodes such as spherical MoS 2 /Mo 2 C-Ti [7], Ni 2(1-x) Mo 2x P nanowires-nickel foam (NF) [27] and coralloid FeP/Ni 2 P-NF [28] have shown the potential for large current density (500 and 1000 mA cm À2 ) hydrogen evolution in alkaline solution. It still remains an open challenge to further improve the HER performance at large current density.…”

Section: Introductionmentioning

confidence: 99%

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A highly active and durable electrocatalyst for large current density hydrogen evolution reaction

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Liu

et al. 2020

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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A highly active and durable electrocatalyst for large current density hydrogen evolution reaction

Xue

Liu

et al. 2020

Science Bulletin

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“…Earlier investigations have considered HER activity in acidic medium over Ni 2 P catalysts, whereby the Volmer-Tafel mechanism (H + (aq) → H * , 2H * → ↑H 2 ) involves only characterizing the Gibb's free energy hydrogen adsorption to the catalyst surface [22,23]. There exist limited studies of the HER activity of Ni 2 P under alkaline conditions and the underlying mechanism is still poorly understood [37,38]. The mechanism of the HER in alkaline media is slightly different to acidic media and can typically be treated as a combination of three elementary steps: the Volmer step-water dissociation and formation of a reactive intermediate (H 2 O + e − + cat → H*-cat + OH − )-followed by either the Heyrovsky step (H*-cat + H 2 O + e-→ cat + OH − + ↑H 2 ) or the Tafel recombination step (2H*-cat → ↑H 2 ).…”

mentioning

confidence: 99%

First-Principles Mechanistic Insights into the Hydrogen Evolution Reaction on Ni2P Electrocatalyst in Alkaline Medium

Cross

Dzade

2020

Catalysts

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Nickel phosphide (Ni 2 P) is a promising material for the electrocatalytic generation of hydrogen from water. Here, we present a chemical picture of the fundamental mechanism of Volmer-Tafel steps in hydrogen evolution reaction (HER) activity under alkaline conditions at the (0001) and (1010) surfaces of Ni 2 P using dispersion-corrected density functional theory calculations. Two terminations of each surface (Ni 3 P 2 -and Ni 3 P-terminated (0001); and Ni 2 P-and NiP-terminated (1010)), which have been shown to coexist in Ni 2 P samples depending on the experimental conditions, were studied. Water adsorption on the different terminations of the Ni 2 P (0001) and (1010) surfaces is shown to be exothermic (binding energy in the range of 0.33−0.68 eV) and characterized by negligible charge transfer to/from the catalyst surface (0.01−0.04 e − ). High activation energy barriers (0.86−1.53 eV) were predicted for the dissociation of water on each termination of the Ni 2 P (0001) and (1010) surfaces, indicating sluggish kinetics for the initial Volmer step in the hydrogen evolution reaction over a Ni 2 P catalyst. Based on the predicted Gibbs free energy of hydrogen adsorption (∆G H *) at different surface sites, we found that the presence of Ni 3 -hollow sites on the (0001) surface and bridge Ni-Ni sites on the (1010) surface bind the H atom too strongly. To achieve facile kinetics for both the Volmer and Heyrovsky-Tafel steps, modification of the surface structure and tuning of the electronic properties through transition metal doping is recommended as an important strategy.and Ni 2 P [18-20] have been regarded as very promising electrocatalysts for the HER owing to their low-cost, appropriate electronic structures, and high electrochemical stability. Nickel phosphide (Ni 2 P) in particular is an emerging catalyst for hydrogen evolution reactions [20][21][22][23], hydrodesulfurization (HDS) [24,25], hydrodenitrogenation (HDN) [26][27][28], hydrodeoxygenation (HDO) [29], hydrodechlorination (HDCl) [30], and water-gas shift reactions [31]. Ni 2 P is considered an attractive alternative to noble metal catalysts for HER [20] because both of its constituent elements nickel and phosphorous are cheap, abundant, and non-toxic, which makes Ni 2 P a promising cost-effective material for scalable renewable energy conversion systems.Nickel phosphides are stable and durable in strong acid and alkali conditions, prolonging the turnover number (TON) and lifetime of the catalyst and hence can achieve enhanced HER efficiency [32,33]. The Ni 2 P (0001) surface is the most studied facet for HER activity owing to its comparable predicted hydrogen evolution activity to that of hydrogenase [22,[34][35][36]. Earlier investigations have considered HER activity in acidic medium over Ni 2 P catalysts, whereby the Volmer-Tafel mechanism (H + (aq) → H * , 2H * → ↑H 2 ) involves only characterizing the Gibb's free energy hydrogen adsorption to the catalyst surface [22,23]. There exist limited studies of the HER activity of Ni 2 P under alkaline c...

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“…[ 91 ] The DFT result suggested that CoN x @GDY had a relatively small H 2 O activation energy (Δ G 1, 0.45 eV), which was much smaller than that of benchmarked electrocatalysts such as Ni 2 P (1.16 eV) and NiMoP (0.84 eV) ( Figure 9 a,c). [ 140 ] It also possessed a small H adsorption energy of 0.05 eV, which was similar with Pt catalyst. All of these results suggested that CoN x @GDY catalyzed HER proceeded an energy‐favorable Volmer–Heyrovsky pathway, further revealing its high catalytic activity.…”

Section: Gdy Supported Electrocatalysts For Energy Conversionmentioning

confidence: 93%

Graphdiyne: A Rising Star of Electrocatalyst Support for Energy Conversion

Lai

Zhang

et al. 2020

Advanced Energy Materials

118

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Graphdiyne (GDY), a rising star of 2D carbon allotropes with one‐atom‐thick planar layers, has achieved the coexistence of sp‐ and sp2‐hybridized carbon atoms in a 2D planar structure. In contrast to the prevailing carbon allotropes, GDY possesses Dirac cone structures, which endow it with unique chemical and physical properties, including an adjustable inherent bandgap, high‐speed charge carrier transfer efficiency, and excellent conductivity. Additionally, GDY also displays great potential in photocatalysis, rechargeable batteries, solar cells, detectors, and especially electrocatalysis. In this work, various GDY‐supported electrocatalysts are described and the reasons why GDY can act as a novel support are analyzed from the perspective of molecular structure, electronic properties, mechanical properties, and stability. The various electrochemical applications of GDY‐supported electrocatalysts in energy conversion such as hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction, overall water splitting, and nitrogen reduction reaction are reviewed. The challenges facing GDY and GDY‐based materials in future research are also outlined. This review aims at providing an in‐depth understanding of GDY and promoting the development and application of this novel carbon material.

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Ternary Ni2(1-x)Mo2xP nanowire arrays toward efficient and stable hydrogen evolution electrocatalysis under large-current-density

Cited by 247 publications

References 52 publications

A highly active and durable electrocatalyst for large current density hydrogen evolution reaction

A highly active and durable electrocatalyst for large current density hydrogen evolution reaction

First-Principles Mechanistic Insights into the Hydrogen Evolution Reaction on Ni2P Electrocatalyst in Alkaline Medium

Graphdiyne: A Rising Star of Electrocatalyst Support for Energy Conversion

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