Cobalt phosphide as a highly active non-precious metal cocatalyst for photocatalytic hydrogen production under visible light irradiation

Cao, Shuang; Chen, Yong; Hou, Chun‐Chao; Lv, Xiao‐Jun; Fu, Wen‐Fu

doi:10.1039/c4ta07149b

Cited by 162 publications

(100 citation statements)

References 41 publications

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“…Likewise, the peaks at 778.5 eV and 793.6 eV are attributed to Co 2p 3/2 and Co 2p 1/2 of metallicC o as ar esult of the formation of CoÀP ( Figure 4c). [39,40] The peaks at 782.6 eV and 798.3 eV are assigned to Co 2p 3/2 and Co 2p 1/2 of oxidized cobalts pecies, with ab inding energy of 803.3 eV. [41] The XPS results further confirm the formation of NiCoP on the surface of g-C 3 N 4 .…”

Section: Resultsmentioning

confidence: 87%

“…The corresponding peaks centered at 862.2 eV and 878.2 eV are attributed to satellite peaks. Likewise, the peaks at 778.5 eV and 793.6 eV are attributed to Co 2p 3/2 and Co 2p 1/2 of metallic Co as a result of the formation of Co−P (Figure c) . The peaks at 782.6 eV and 798.3 eV are assigned to Co 2p 3/2 and Co 2p 1/2 of oxidized cobalt species, with a binding energy of 803.3 eV .…”

Section: Resultsmentioning

confidence: 95%

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Enhanced Photocatalytic Hydrogen Evolution of NiCoP/g‐C₃N₄ with Improved Separation Efficiency and Charge Transfer Efficiency

et al. 2017

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Although NiCoP has attracted much attention in the field of electrocatalysis, the study of its photocatalytic activity and mechanism have been somewhat limited. NiCoP/g‐C3N4, synthesized by simple one‐pot method, is a highly efficient photocatalyst for hydrogen production from water. NiCoP/g‐C3N4 exhibits a hydrogen evolution rate of 1643 μmol h−1 g−1, which is 21 times higher than that of bare g‐C3N4. The excellent performance is due to a combination of improved separation efficiency and effective charge transfer efficiency. The photogenerated charge behavior is characterized by the surface photovoltage (SPV), transient photovoltage (TPV), and photoluminescence spectroscopy. The photogenerated charge transport is investigated by electrochemical impedance spectroscopy and polarization curve. Moreover, the effective charge transfer efficiency was measured according to the mimetic apparent quantum yield. SPV and TPV measurements, whereby 10 vol % of a triethanolamine–water mixture was added into the testing system, were taken to simulate the real atmosphere for photocatalytic reaction, which can give rise to the photogenerated charge transfer process. A possible photocatalytic mechanism was also proposed. This study may provide an efficient theoretical basis to design transition metal phosphide cocatalyst‐modified photocatalysts.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 95%

Enhanced Photocatalytic Hydrogen Evolution of NiCoP/g‐C₃N₄ with Improved Separation Efficiency and Charge Transfer Efficiency

et al. 2017

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“…41‐1049) (Figure S3, Supporting Information). No obvious diffraction peaks were attributed to Ni‐MoS 2 in the XRD patterns and no significant diffraction peaks were different from those of the CdS nanorods after the co‐catalyst loaded, probably due to the relatively small amount of Ni‐MoS 2 distribution and too strong diffraction peaks of the CdS nanorods . In addition, we performed the synthesis of Ni‐MoS 2 without CdS nanorods addition, and the resulting XRD pattern unveiled that the nickel was doped in the MoS 2 , due to no obvious characteristic peaks of NiS (Figure S4, Supporting Information), which was in agreement with a previous report …”

Section: Figurementioning

confidence: 94%

Visible‐Light Direct Conversion of Ethanol to 1,1‐Diethoxyethane and Hydrogen over a Non‐Precious Metal Photocatalyst

Chao

Zhang

et al. 2018

Chemistry A European J

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Converting renewable biomass and their derivatives into chemicals and fuels has received much attention to reduce the dependence on fossil resources. Photocatalytic ethanol dehydrogenation–acetalization to prepare value‐added 1,1‐diethoxyethane and H2 was achieved over non‐precious metal CdS/Ni‐MoS2 catalyst under visible light. The system displays an excellent production rate and high selectivity of 1,1‐diethoxyethane, 52.1 mmol g−1 h−1 and 99.2 %, respectively. In‐situ electron spin resonance, photoluminescence spectroscopy and transient photocurrent responses were conducted to investigate the mechanism. This study provides a promising strategy for a green application of bioethanol.

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“…The peak of P 2p 3/2 at 129.3 eV implies the presence of partially negatively charged P, while the broad peak at 133.8 eV belongs to the oxidized phosphorus species due to air contact. [16,19] It is noted that the Co 2p and P 2p 3/2 peaks of Co 2 P/g-C 3 N 4 shifted slightly toward larger binding energy as compared to those of the pure Co 2 P sample ( Figure S5, Supporting Information), which was ascribed to the interfacial coupling between Co 2 P and g-C 3 N 4 . Furthermore, the C 1s and N 1s XPS spectra ( Figure S6, Supporting Information) of Co 2 P/g-C 3 N 4 manifest the characteristic nature of g-C 3 N 4 , [13] and the O 1s XPS spectrum ( Figure S4c, Supporting Information) depicts two deconvoluted peaks at 533.1 and 531.5 eV, accounting for the adsorbed oxygen species on the surface and CO bonds, respectively.…”

Section: Photocatalytic H 2 Evolutionmentioning

confidence: 96%

“…[18] Not only that, 0D Co 2 P nanoparticles have also been employed as efficient cocatalysts integrated CdS nanorods for photocatalytic H 2 evolution. [19] Lu and co-workers also accentuated that Co 2 P was a promising and highly efficient candidate as a cocatalyst for photocatalytic H 2 evolution reaction. [20] Nevertheless, at present, the 1D Co 2 P nanorods are scarcely discussed as cocatalysts for H 2 photogeneration.…”

Section: Doi: 101002/ppsc201700251mentioning

confidence: 99%

Co₂P Nanorods as an Efficient Cocatalyst Decorated Porous g‐C₃N₄ Nanosheets for Photocatalytic Hydrogen Production under Visible Light Irradiation

Zeng

Ong

Chen

et al. 2017

Part & Part Syst Charact

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promote the photocatalytic activity for H 2 generation. [4] Up to now, transition metal sulfides, namely NiS, [5,6] MoS 2 , [7,8] and WS 2 , [9,10] generally act as noble metal-free cocatalysts modified g-C 3 N 4 for the achievement of enhanced photocatalytic H 2 evolution activity. In analogy to metal sulfides, transition metal phosphides such as Ni 2 P, [11] Ni 12 P 5 , [12,13] and CoP, [14] also serve as reduction cocatalysts decorated g-C 3 N 4 for light-driven H 2 evolution. However, nearly all the reported metal phosphides loaded g-C 3 N 4 are synthesized via a gassolid reaction strategy using NaH 2 PO 2 or NH 4 H 2 PO 4 as P sources, in which the synthesis undergoes multistep procedures and high temperature for releasing highly toxic PH 3 from hypophosphites. [15] Furthermore, the as-developed metal phosphide/g-C 3 N 4 systems often consist of 0D nanoparticles and g-C 3 N 4 . To the best of our knowledge, other dimensions of metal phosphides such as 1D nanorods and 2D nanosheets have not ever been reported hitherto for the g-C 3 N 4 -based photocatalytic system for H 2 production.Recently, Co 2 P has been widely used in the fields of supercapacitors, [16] lithium ion batteries, [17] and electrocatalytic H 2 evolution reaction. [18] Not only that, 0D Co 2 P nanoparticles have also been employed as efficient cocatalysts integrated CdS nanorods for photocatalytic H 2 evolution. [19] Lu and co-workers also accentuated that Co 2 P was a promising and highly efficient candidate as a cocatalyst for photocatalytic H 2 evolution reaction. [20] Nevertheless, at present, the 1D Co 2 P nanorods are scarcely discussed as cocatalysts for H 2 photogeneration. Equally important, it constitutes a critical challenge for the hybridization of 1D Co 2 P nanorods and 2D g-C 3 N 4 nanosheets.Here, we report a novel type of hybrid photocatalysts composed of 1D metal phosphides and 2D g-C 3 N 4 nanosheets, which feature relatively low-cost, a facile preparation, and noble metal-free photocatalytic H 2 evolution. Briefly, the colloidally synthesized Co 2 P nanorods by using low-cost triphenylphosphine (TPP) as the P source were successfully loaded on the porous g-C 3 N 4 nanosheets for the first time through a solutionphase route under sonication. In this work, the cocatalysts of Co 2 P nanorods play an imperative role in the photocatalytic H 2 generation, which could be attested by photoluminescence (PL) spectroscopy and photoelectrochemical (PEC) analysis. Essentially, this solution-phase approach could be broadly applied for the rational construction of other 1D and 2D nanomaterials, C 3 N 4 ), which typically acts as the 2D support for loading with cocatalysts, endows fascinating performances for photocatalytic water splitting. Benefiting from the natural sheet-like structure in g-C 3 N 4 , 1D metal phosphides (Co 2 P) nanorods are incorporated into 2D porous g-C 3 N 4 nanosheets via a solution-phase method under ultrasonication. The novel 1D/2D Co 2 P/g-C 3 N 4 heterojunction nanohybrids exhibit ameliorated visible-light phot...

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Cobalt phosphide as a highly active non-precious metal cocatalyst for photocatalytic hydrogen production under visible light irradiation

Abstract: Co2P nanoparticles were applied to photocatalytic hydrogen evolution in aqueous acidic media, and simultaneously, dl-mandelic acid was transformed into benzoylformic acid.

Cited by 162 publications

References 41 publications

Enhanced Photocatalytic Hydrogen Evolution of NiCoP/g‐C₃N₄ with Improved Separation Efficiency and Charge Transfer Efficiency

Enhanced Photocatalytic Hydrogen Evolution of NiCoP/g‐C₃N₄ with Improved Separation Efficiency and Charge Transfer Efficiency

Visible‐Light Direct Conversion of Ethanol to 1,1‐Diethoxyethane and Hydrogen over a Non‐Precious Metal Photocatalyst

Co₂P Nanorods as an Efficient Cocatalyst Decorated Porous g‐C₃N₄ Nanosheets for Photocatalytic Hydrogen Production under Visible Light Irradiation

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Cobalt phosphide as a highly active non-precious metal cocatalyst for photocatalytic hydrogen production under visible light irradiation

Abstract: Co2P nanoparticles were applied to photocatalytic hydrogen evolution in aqueous acidic media, and simultaneously, dl-mandelic acid was transformed into benzoylformic acid.

Cited by 162 publications

References 41 publications

Enhanced Photocatalytic Hydrogen Evolution of NiCoP/g‐C3N4 with Improved Separation Efficiency and Charge Transfer Efficiency

Enhanced Photocatalytic Hydrogen Evolution of NiCoP/g‐C3N4 with Improved Separation Efficiency and Charge Transfer Efficiency

Visible‐Light Direct Conversion of Ethanol to 1,1‐Diethoxyethane and Hydrogen over a Non‐Precious Metal Photocatalyst

Co2P Nanorods as an Efficient Cocatalyst Decorated Porous g‐C3N4 Nanosheets for Photocatalytic Hydrogen Production under Visible Light Irradiation

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Enhanced Photocatalytic Hydrogen Evolution of NiCoP/g‐C₃N₄ with Improved Separation Efficiency and Charge Transfer Efficiency

Enhanced Photocatalytic Hydrogen Evolution of NiCoP/g‐C₃N₄ with Improved Separation Efficiency and Charge Transfer Efficiency

Co₂P Nanorods as an Efficient Cocatalyst Decorated Porous g‐C₃N₄ Nanosheets for Photocatalytic Hydrogen Production under Visible Light Irradiation