Controllable synthesis of Co2P nanorods as high-efficiency bifunctional electrocatalyst for overall water splitting

Song, Meijing; He, Yu; Zhang, Mengmeng; Zheng, Xuerong; Wang, Yang; Zhang, Jinfeng; Han, Xiaopeng; Zhong, Cheng; Hu, Wenbin; Deng, Yida

doi:10.1016/j.jpowsour.2018.09.042

Cited by 53 publications

(15 citation statements)

References 44 publications

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“…The superior OER activity is even comparable to the state-of-the-art RuO 2 catalyst (0.320 V). [30] Furthermore, the fitted Tafel slopes of 74.1 and 74.7 mV dec À 1 exhibited faster kinetics for both HER and OER. The durabilities of Co 2 P@CoP/PC for catalytic HER and OER in 0.5 mol L À 1 H 2 SO 4 and 1 mol L À 1 KOH electrolytes were evaluated with a chronopotentiometry test, respectively.…”

Section: Resultsmentioning

confidence: 94%

“…XPS survey spectrum (Figure A) further confirmed the component of Co and P. The high‐resolution Co 2p spectrum (Figure B) showed two broadened peaks attributed to Co 2p 3/2 at 782.1 eV, Co 2p 1/2 at 798.2 eV, and their apparent satellite peaks at 785.9 eV and 803.1 eV, respectively. Two new overlapped small peaks centered at 778.6 and 793.5 eV were both assigned to Co−P . In the P 2p spectra (Figure C), P 2p1/2 and P 2p3/2 peaks were clearly resolved at 129.6 and 130.4 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Low overpotential of 0.212 and 0.328 V were required for HER and OER, respectively over the Co 2 P@CoP/PC to achieve a current density of 10 mA cm −2 . The superior OER activity is even comparable to the state‐of‐the‐art RuO 2 catalyst (0.320 V) . Furthermore, the fitted Tafel slopes of 74.1 and 74.7 mV dec −1 exhibited faster kinetics for both HER and OER.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure S12, the EASA of Co 2 P@CoP/PC (41.13 mF cm −2 ) is higher than that of Co/PC (28.15 mF cm −2 ). In addition, turnover frequency (TOF) was calculated to further assess the intrinsic activity . As seen from Figure S13, the Co 2 P@CoP/PC displayed enhanced TOF values of HER and OER compared to Co/PC, indicating a superior catalytic activity for the Co 2 P@CoP/PC.…”

Section: Resultsmentioning

confidence: 99%

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Ammonium Nitrate‐Assisted Low‐Temperature Synthesis of Co, Co₂P@CoP Embedded in Biomass‐Derived Carbons as Efficient Electrocatalysts for Hydrogen and Oxygen Evolution Reaction

et al. 2020

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Electrochemical water splitting into H 2 and O 2 provides a promising and sustainable strategy for the future production of clean energy. Herein, we report an ammonium nitrate (AN)assisted synthetic strategy to prepare Co, Co 2 P@CoP nanoparticles embedded in biomass-derived porous carbons as bifunctional electrodes for water splitting. The use of AN is not only activating biomass to porous carbons, but also reducing the synthetic temperature significantly. The synergistic effects of the Co 2 P@CoP heterostructure could lead to a low adsorption energy of hydrogen (ΔG H*) and conduction band bending, together with the N/S-codoped porous carbons could provide large specific surface area and desirable electrondonating feature, contribute to the remarkable performance with overpotentials of 0.129 and 0.212 V for hydrogen evolution reaction (HER) in 0.5 mol L À 1 H 2 SO 4 and 1 mol L À 1 KOH, and 0.328 V for oxygen evolution reaction (OER) in 1 mol L À 1 KOH, at a current density of 10 mA cm À 2. Moreover, the Co 2 P@CoP/PC catalysts enable overall water splitting with a small cell voltage of 1.63 V to achieve 10 mA cm À 2 and exhibit long-term durability over 1000 min.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Ammonium Nitrate‐Assisted Low‐Temperature Synthesis of Co, Co₂P@CoP Embedded in Biomass‐Derived Carbons as Efficient Electrocatalysts for Hydrogen and Oxygen Evolution Reaction

et al. 2020

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“…46 Most studies have focused on the development of single-metal phosphide nanostructures, yet their activities are still far from satisfactory. 47 Compared with single transition-metal phosphide nanoparticles, the fabrication of bimetallic phosphide is verified as a promising method to boost the catalytic activities. 48 For instance, Ni 2 P/iron phosphide (FeP) heterostructure nanoparticles with graphene nanosheets (NFP@NG) were found to make a greater contribution to H 2 production than single-component counterparts.…”

Section: Introductionmentioning

confidence: 99%

Cu₃P and Ni₂P co‐modified g‐C₃N₄ nanosheet with excellent photocatalytic H₂ evolution activities

Sun

Shi

et al. 2020

J of Chemical Tech & Biotech

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Copper-nickel phosphides/ graphite-like phase carbon nitride (Cu 3 P-Ni 2 P/g-C 3 N 4) composites were obtained through a facile one-pot in situ solvothermal approach. The coexistence of Cu 3 P and Ni 2 P plays an important role in enhancing the catalytic activity of g-C 3 N 4. The 7 wt% Cu 3 P-Ni 2 P/g-C 3 N 4 bimetallic phosphide photocatalyst demonstrates the best photocatalytic hydrogen (H 2) evolution rate of 6529.8 ∼mol g −1 h −1 , which is 80.7-fold higher than that of g-C 3 N 4. The apparent quantum yield (AQE) was determined to be 18.5% at 400 nm over the 7% Cu 3 P-Ni 2 P/g-C 3 N 4. This in situ growth strategy produced intimate contact interfaces, leading to a significantly promoted separation of charge carriers, and hence strengthened the photocatalytic H 2 production. Moreover, the coexistence of Cu 3 P and Ni 2 P reduced the overpotential of H 2 during the evolution process, further benefiting H 2 production. Finally, the photocatalytic enhancement mechanism was proposed and verified by fluorescence and electrochemical analysis. This work provides a low-cost strategy to synthesize nonprecious bimetallic phosphides/ carbon nitride photocatalyst with outstanding H 2 production activity.

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Hierarchical Core‐Shell N‐Doped Carbon@FeP₄‐CoP Arrays as Robust Bifunctional Electrocatalysts for Overall Water Splitting at High Current Density

Yan

Shoko

et al. 2021

Adv Materials Inter

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Exploring non‐precious metal‐based electrocatalysts at high current density and stability is an urgent issue for sustainable H2 production. Here, hierarchical core‐shell N‐doped carbon encapsulated array‐like FeP4 and CoP active components have been fabricated in situ on the surface of nickel foam (NC@FeP4‐CoP/NF) by etching sheet‐like ZIF‐67 arrays, Prussian analog formation, and phosphating in turns. The crystallinity, hierarchical heterostructure, and chemical state have been carefully discussed. Electrochemical studies demonstrate that the catalyst displays excellent electrocatalytic activity and durability in electrochemical oxygen evolution reaction (η20 = 218 mV) and hydrogen evolution reaction (η10 = 116 mV), better than most previously reported bifunctional catalysts. Moreover, the bifunctional catalyst only needs 1.72 and 1.80 V cell voltages at 500 and 1000 mA cm−2 respectively, together with a good catalytic stability at 500 mA cm−2 for 48 h, implying potential commercialization prospects. This excellent electrocatalytic performance is mainly attributed to the distinctive hierarchical structure as well as core‐shell NC encapsulated FeP4‐CoP active sites, which can enhance the charge transport rate, inhibit the exfoliation of the active materials, provide a larger active surface area, and facilitate electrolyte diffusion and gas release.

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Controllable synthesis of Co2P nanorods as high-efficiency bifunctional electrocatalyst for overall water splitting

Cited by 53 publications

References 44 publications

Ammonium Nitrate‐Assisted Low‐Temperature Synthesis of Co, Co₂P@CoP Embedded in Biomass‐Derived Carbons as Efficient Electrocatalysts for Hydrogen and Oxygen Evolution Reaction

Ammonium Nitrate‐Assisted Low‐Temperature Synthesis of Co, Co₂P@CoP Embedded in Biomass‐Derived Carbons as Efficient Electrocatalysts for Hydrogen and Oxygen Evolution Reaction

Cu₃P and Ni₂P co‐modified g‐C₃N₄ nanosheet with excellent photocatalytic H₂ evolution activities

Hierarchical Core‐Shell N‐Doped Carbon@FeP₄‐CoP Arrays as Robust Bifunctional Electrocatalysts for Overall Water Splitting at High Current Density

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Controllable synthesis of Co2P nanorods as high-efficiency bifunctional electrocatalyst for overall water splitting

Cited by 53 publications

References 44 publications

Ammonium Nitrate‐Assisted Low‐Temperature Synthesis of Co, Co2P@CoP Embedded in Biomass‐Derived Carbons as Efficient Electrocatalysts for Hydrogen and Oxygen Evolution Reaction

Ammonium Nitrate‐Assisted Low‐Temperature Synthesis of Co, Co2P@CoP Embedded in Biomass‐Derived Carbons as Efficient Electrocatalysts for Hydrogen and Oxygen Evolution Reaction

Cu3P and Ni2P co‐modified g‐C3N4 nanosheet with excellent photocatalytic H2 evolution activities

Hierarchical Core‐Shell N‐Doped Carbon@FeP4‐CoP Arrays as Robust Bifunctional Electrocatalysts for Overall Water Splitting at High Current Density

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Resources

About

Ammonium Nitrate‐Assisted Low‐Temperature Synthesis of Co, Co₂P@CoP Embedded in Biomass‐Derived Carbons as Efficient Electrocatalysts for Hydrogen and Oxygen Evolution Reaction

Ammonium Nitrate‐Assisted Low‐Temperature Synthesis of Co, Co₂P@CoP Embedded in Biomass‐Derived Carbons as Efficient Electrocatalysts for Hydrogen and Oxygen Evolution Reaction

Cu₃P and Ni₂P co‐modified g‐C₃N₄ nanosheet with excellent photocatalytic H₂ evolution activities

Hierarchical Core‐Shell N‐Doped Carbon@FeP₄‐CoP Arrays as Robust Bifunctional Electrocatalysts for Overall Water Splitting at High Current Density