Vertically aligned NiP2 nanosheets with interlaced mesh network for highly efficient water splitting under alkaline and acid solutions

Cao, Qinghe; Wang, Chuanqin; Chen, Shujie; Xu, Xing-Dong; Liu, Fenggang; Geng, Xin; Wang, Jiahai

doi:10.1016/j.ijhydene.2019.01.172

Cited by 39 publications

(22 citation statements)

References 74 publications

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“…The XRD pattern (Fig. 2b) reveals the formation of NiP 2 -FeP 2 on the metallic Cu NW with strong diffraction peaks originating from the cubic NiP 2 (JCPDS 21-0590) 31 and FeP 2 (JCPDS 89-2261) 32 along with diffraction of the metallic Cu core. The EDS pattern confirms the existence of Ni, Fe, P, and Cu with a Ni:Fe:P ratio of 1.17:1:1.96, which is consistent with the phases of the Ni and Fe phosphides deduced from the XRD pattern, whereas, for only NiP 2 /Cu NW /Cu f and FeP 2 /Cu NW /Cu f electrode, the ratio between Ni:P and Fe:P, respectively, are also almost 1:2, similar with the metal to phosphorus ratio of the main electrode ( Supplementary Figs.…”

Section: Resultsmentioning

confidence: 99%

Industry-applicable, efficient hydrogen evolution reaction through an interface-activated bimetallic electrode with seawater photolysis in alkaline media

Kumar

Bui²,

Lee³

et al. 2020

Preprint

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<a>Hydrogen evolution reaction (HER) electrocatalysts over platinum (Pt) in an alkaline medium is crucial for hydrogen economy. Herein, we demonstrate new concept “interface-active electrode” to transform naturally inert alkaline HER materials towards industry-applicable HER electrocatalyst, comprised of interface-rich NiP2-FeP2 on Cu nanowires that required overpotential as low as 23.6 and 357 mV at -10 and -1000 mA/cm2, respectively, with exceptional stability at the industrial current density of -1 A cm-2, superior to commercial Pt under alkaline solution. Structural characterization and theoretical calculations revealed the abundant interface between facets of NiP2-FeP2 on Cu exhibits optimum H adsorption-free energy than Pt and lower kinetic barrier for water dissociation (ΔGB = 0.16 eV), boosting alkaline HER. Additionally, when integrated in a water splitting device, generated 10 mA/cm2 at only </a>1.42, 1.4, and 1.31 V under 1 M KOH, artificial seawater at 25 ̊C and 100 ̊C, respectively, along with high solar-to-hydrogen (STH) conversion efficiency of 19.85 %.

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Section: Resultsmentioning

confidence: 99%

Industry-applicable, efficient hydrogen evolution reaction through an interface-activated bimetallic electrode with seawater photolysis in alkaline media

Kumar

Bui²,

Lee³

et al. 2020

Preprint

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“…[35] In situ Raman spectra were applied to probe the possible surface oxidation of NiP 2 -650(c/ m)e lectrode (Supporting Information, Figure S14a). The in situ Raman spectra showed no obvious change during the HER process with the potential region from À1.03 Vt o À1.5 V( vs.A g/AgCl) and only two in situ Raman peaks (Supporting Information, Figure S14b) at 291 cm À1 and 451 cm À1 ,w hich belonged to P 2 liberation (E g )a nd P À Pi nphase stretch (A g )o fN iP 2 , [37] were observed. Furthermore, ex situ Raman spectra (Supporting Information, Figure S14c) further revealed the excellent stability of NiP 2 -650(c/m) electrode even after 3000 CV cycles.T of urther verify the surface long-term stability of the NiP 2 phase junction, the surface structure and chemical compositions were examined after 14 hs tability test.…”

Section: Angewandte Chemiementioning

confidence: 99%

Phase‐Junction Electrocatalysts towards Enhanced Hydrogen Evolution Reaction in Alkaline Media

Wang

Han

et al. 2020

Angewandte Chemie

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To ensure sustainable hydrogen production by water electrolysis,robust, earth-abundant, and high-efficient electrocatalysts are required. Constructing ahybrid system could lead to further improvement in electrocatalytic activity.I nterface engineering in composite catalysts is thus critical to determine the performance,a nd the phase-junction interface should improve the catalytic activity.H ere,w es howt hat nickel diphosphide phase junction (c-NiP 2 /m-NiP 2)i sa ne ffective electrocatalyst for hydrogen production in alkaline media. The overpotential (at 10 mA cm À2)f or NiP 2-650 (c/m) in alkaline media could be significantly reduced by 26 %a nd 96 % compared with c-NiP 2 and m-NiP 2 ,respectively.The enhancement of catalytic activity should be attributed to the strong water dissociation ability and the rearrangement of electrons around the phase junction, which markedly improved the Volmer step and benefited the reduction process of adsorbed protons.

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“…Notably, nickel phosphides have eight mono-phosphides and poly-phosphides with different Ni/P ratios, i.e., Ni3P, Ni5P2, Ni12P5, Ni2P, Ni5P4, NiP, NiP2, and NiP3, and the stoichiometric compositions, crystal phases, and crystal facets show influences on the electrocatalytic HER activity. The nickel phosphides of Ni2P [45], Ni5P4 [46], Ni12P5 [47], Ni3P [48], and NiP2 [49] phases are generally obtained according to the reported results. Pan et al investigated the HER performance of different types of nickel phosphides (Ni12P5, Ni2P, and Ni5P4) and found that their catalytic performance followed the order of Ni5P4>Ni2P>Ni12P5 [50].…”

Section: Properties Of Nickel Phosphidesmentioning

confidence: 72%

“…The Ni-P/CNFs electrode exhibits excellent HER performance in 0.5 M H 2 SO 4 solution with a low overpotential of 71 mV to achieve a current density of 10 mA cm −2 with a small Tafel slope of 74 mV/dec and excellent catalytic stability over 100 h (Figure 11d,e). Cao et al successfully synthesized vertically aligned NiP 2 nanosheets on Ti foil via a facile two-step process [49]. As shown in Figure 11f, the precursor of Ni(OH) 2 nanosheets was first prepared on Ti foil through a facile hydrothermal method, and then was transformed into NiP 2 nanosheets by thermal phosphidation with red phosphorus.…”

Section: Thermal Phosphidation With Red Phosphorusmentioning

confidence: 99%

Nickel Phosphide Electrocatalysts for Hydrogen Evolution Reaction

Liu

et al. 2020

Catalysts

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The production of hydrogen through electrochemical water splitting driven by clean energy becomes a sustainable route for utilization of hydrogen energy, while an efficient hydrogen evolution reaction (HER) electrocatalyst is required to achieve a high energy conversion efficiency. Nickel phosphides have been widely explored for electrocatalytic HER due to their unique electronic properties, efficient electrocatalytic performance, and a superior anti-corrosion feature. However, the HER activities of nickel phosphide electrocatalysts are still low for practical applications in electrolyzers, and further studies are necessary. Therefore, at the current stage, a specific comprehensive review is necessary to focus on the progresses of the nickel phosphide electrocatalysts. This review focuses on the developments of preparation approaches of nickel phosphides for HER, including a mechanism of HER, properties of nickel phosphides, and preparation and electrocatalytic HER performances of nickel phosphides. The progresses of the preparation and HER activities of the nickel phosphide electrocatalysts are mainly discussed by classification of the preparation method. The comparative surveys of their HER activities are made in terms of experimental metrics of overpotential at a certain current density and Tafel slope together with the preparation method. The remaining challenges and perspectives of the future development of nickel phosphide electrocatalysts for HER are also proposed.

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Vertically aligned NiP2 nanosheets with interlaced mesh network for highly efficient water splitting under alkaline and acid solutions

Cited by 39 publications

References 74 publications

Industry-applicable, efficient hydrogen evolution reaction through an interface-activated bimetallic electrode with seawater photolysis in alkaline media

Industry-applicable, efficient hydrogen evolution reaction through an interface-activated bimetallic electrode with seawater photolysis in alkaline media

Phase‐Junction Electrocatalysts towards Enhanced Hydrogen Evolution Reaction in Alkaline Media

Nickel Phosphide Electrocatalysts for Hydrogen Evolution Reaction

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