Defective graphene aerogel-supported Bi–CoP nanoparticles as a high-potential air cathode for rechargeable Zn–air batteries

Chen, Jianping; Ni, Bangqing; Hu, Jiugang; Wu, Zexing; Jin, Wei

doi:10.1039/c9ta07669g

Cited by 42 publications

(25 citation statements)

References 67 publications

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“…The electrochemically active surface area (ECSA) of the electrocatalysts can further indicate the cause of the excellent electrochemical activity. The double-layer capacitance (C dl ) of NPMCNT-50, NPMCNT-100, [2] NiP@N,P-CNSs 390 0.75 [7] Co@N-CNTF 350 0.81 [11] CoP NPs/CNSs 340 0.88 [60] CoP-PBSCF 378 0.75 [61] Bi-CoP/NP-DG 370 0.81 [62] CoP x /CoN x C@CNT 460 0.83 [63] CoNP@NC/NG-700 390 0.83 [64] CoZn-NC-800 480 0.82 [65] Co-N/C-800 492 0.67 [66] Co/N-GCA 408 0.81 [67] Co/CoP 342 0.93 This work Fig. 6a-e.…”

Section: Electrocatalytic Performance and Discussionmentioning

confidence: 99%

Co/CoP Nanoparticles Encapsulated Within N, P-Doped Carbon Nanotubes on Nanoporous Metal-Organic Framework Nanosheets for Oxygen Reduction and Oxygen Evolution Reactions

Yang

Ren

et al. 2020

Nanoscale Res Lett

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Herein, Co/CoP nanoparticles encapsulated with N, P-doped carbon nanotubes derived from the atomic layer deposited hexagonal metal-organic frameworks (MOFs) are obtained by calcinations and subsequent phosphating and are employed as electrocatalyst. The electrocatalytic performance evaluations show that the as-prepared electrocatalyst exhibits an overpotential of 342 mV at current density of 10 mA cm −2 and the Tafel slope of 74 mV dec −1 for oxygen evolution reaction (OER), which is superior to the most advanced ruthenium oxide electrocatalyst. The electrocatalyst also shows better stability than the benchmark RuO 2. After 9 h, the current density is only decreased by 10%, which is far less than the loss of RuO 2. Moreover, its onset potential for oxygen reduction reaction (ORR) is 0.93 V and follows the ideal 4-electron approach. After the stability test, the current density of the electrocatalyst retains 94% of the initial value, which is better than Pt/C. The above results indicate that the electrocatalyst has bifunctional activity and excellent stability both for OER and ORR. It is believed that this strategy provides guidance for the synthesis of cobalt phosphide/carbon-based electrocatalysts.

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Section: Electrocatalytic Performance and Discussionmentioning

confidence: 99%

Co/CoP Nanoparticles Encapsulated Within N, P-Doped Carbon Nanotubes on Nanoporous Metal-Organic Framework Nanosheets for Oxygen Reduction and Oxygen Evolution Reactions

Yang

Ren

et al. 2020

Nanoscale Res Lett

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“…The slope of Ni 3 S 2 -350 °C in Figure a is higher than that of the other samples, indicating that it has a very large specific surface area. Because the slope is larger, the roughness of the material itself is larger, indicating that the catalyst has a large active area, which reflects the catalytic performance of the material. , Figure b shows the Mott–Schottky (M-S) curves of different Ni 3 S 2 NR samples. The donor N D and acceptor N A concentration can be obtained by fitting the following Mott–Schottky equation where ε sc , ε 0 , N D , N A , C SC , V , V fb , and q are the dielectric constant of the semiconductor, the vacuum permittivity (8.86 × 10 –14 F cm –1 ), the donor concentration, acceptor concentration, the capacitance of the space charge layer, the applied potential, the flat band potential, and the charge constant (1.6 × 10 –19 C), respectively.…”

Section: Resultsmentioning

confidence: 99%

Efficient Hydrogen Evolution Reaction on Ni₃S₂ Nanorods with a P/N Bipolar Electrode Prepared by Dealloying Sulfurization of NiW Amorphous Alloys

Chen

Ling

et al. 2020

ACS Appl. Energy Mater.

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Rationally designing a new type of earth-abundant and environmentally friendly material with high performance and durability that can convert water to energy by the control point defect method is still a challenge. Herein, we report a newly adjusted method to prepare Ni 3 S 2 nanorods (NRs) by combining transition metals and nanostructures while introducing sulfur vacancies as a means of promoting electron−hole pair transfer. It shows excellent hydrogen evolution electrocatalytic (HER) activity with an overpotential of 162 mV at j = 10 mA cm −2 and chemical stability in 1 M NaOH solution. Electrochemically active surface area (ECSA) calculation results of 0.36 m 2 g −1 confirm the superior performance of Ni 3 S 2 with sulfur vacancies compared to other materials. The Mott−Schottky (M-S) and electrochemical impedance spectroscopy (EIS) results allowed effective optimization of the nanorods after obtaining sulfur vacancies and, surprisingly, showed that they are a P/N-type semiconductor. We speculate that the HER of the Ni 3 S 2 NRs is mainly dominated by the Heyrovsky process. At the same time, the synergistic reaction produced by the electron−hole transfer guided by sulfur vacancies promotes the Heyrovsky process, thus jointly improving the effectiveness of the Ni 3 S 2 NRs. The method of introducing sulfur vacancies in the nanomaterial is simple and has excellent properties, which suggests broad applications for research in the fields of environment and energy.

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“…All these merits make Zn‐air battery become a feasible power supply compared with other contenders [12–16] . In Zn‐air battery, discharge of cathode is realized by oxygen reduction reaction (ORR, O 2 +2H 2 O+4e↔4OH − ) [17–21] . During charge process, oxygen evolution reaction happens (OER, 4OH − −4e↔O 2 +2H 2 O) [22–25] .…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic POM Electrocatalyst Achieves Low Voltage “Charge” in Zn‐Air Battery Coupled with Bisphenol A Degradation

Yin

Zhang

Yao

et al. 2021

Chemistry A European J

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Zn‐air batteriesare a perspective power source for grid‐storage. But, after they are discharged at1.1 to 1.2 V, large overpotential is required for their charging (usually 2.5 V). This is due to a sluggish oxygen evolution reaction (OER). Incorporating organic pollutants into the cathode electrolyte is a feasible strategy for lowering the required charging potential. In the discharge process, the related oxygen reduction reaction, hydrophobic electrocatalysts are more popular than hydrophilic ones. Here, a hydrophobic bifunctional polyoxometalate electrocatalyst is synthesized by precise structural design. It shows excellent activities in both bisphenol A degradation and oxygen reduction reactions. In bisphenol A containing electrolyte, to achieve 100 mA ⋅ cm−2, its potential is only 1.32 V, which is 0.34 V lower than oxygen evolution reaction. In the oxygen reduction reaction, this electrocatalyst follows the four‐electron mechanism. In both bisphenol A degradation and oxygen reduction reactions, it shows excellent stability. With this electrocatalyst as cathode material and bisphenol A containing KOH as electrolyte, a Zn‐air battery was assembled. When “charged” at 85 mA ⋅ cm−2, it only requires 1.98 V. Peak power density of this Zn‐air battery reaches 120.5 mW ⋅ cm−2. More importantly, in the “charge” process, bisphenol A is degraded, which achieves energy saving and pollutant removal simultaneously in one Zn‐air battery.

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Defective graphene aerogel-supported Bi–CoP nanoparticles as a high-potential air cathode for rechargeable Zn–air batteries

Abstract: Bi–CoP nanoparticles supported on N, P doped defective graphene aerogel (Bi–CoP–P-DG) electrocatalyst presents excellent catalytic performances for OER, ORR and Zn–air battery. Moreover, the home-made Zn–air battery can drive overall water-splitting.

Cited by 42 publications

References 67 publications

Co/CoP Nanoparticles Encapsulated Within N, P-Doped Carbon Nanotubes on Nanoporous Metal-Organic Framework Nanosheets for Oxygen Reduction and Oxygen Evolution Reactions

Co/CoP Nanoparticles Encapsulated Within N, P-Doped Carbon Nanotubes on Nanoporous Metal-Organic Framework Nanosheets for Oxygen Reduction and Oxygen Evolution Reactions

Efficient Hydrogen Evolution Reaction on Ni₃S₂ Nanorods with a P/N Bipolar Electrode Prepared by Dealloying Sulfurization of NiW Amorphous Alloys

Hydrophobic POM Electrocatalyst Achieves Low Voltage “Charge” in Zn‐Air Battery Coupled with Bisphenol A Degradation

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Defective graphene aerogel-supported Bi–CoP nanoparticles as a high-potential air cathode for rechargeable Zn–air batteries

Abstract: Bi–CoP nanoparticles supported on N, P doped defective graphene aerogel (Bi–CoP–P-DG) electrocatalyst presents excellent catalytic performances for OER, ORR and Zn–air battery. Moreover, the home-made Zn–air battery can drive overall water-splitting.

Cited by 42 publications

References 67 publications

Co/CoP Nanoparticles Encapsulated Within N, P-Doped Carbon Nanotubes on Nanoporous Metal-Organic Framework Nanosheets for Oxygen Reduction and Oxygen Evolution Reactions

Co/CoP Nanoparticles Encapsulated Within N, P-Doped Carbon Nanotubes on Nanoporous Metal-Organic Framework Nanosheets for Oxygen Reduction and Oxygen Evolution Reactions

Efficient Hydrogen Evolution Reaction on Ni3S2 Nanorods with a P/N Bipolar Electrode Prepared by Dealloying Sulfurization of NiW Amorphous Alloys

Hydrophobic POM Electrocatalyst Achieves Low Voltage “Charge” in Zn‐Air Battery Coupled with Bisphenol A Degradation

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Efficient Hydrogen Evolution Reaction on Ni₃S₂ Nanorods with a P/N Bipolar Electrode Prepared by Dealloying Sulfurization of NiW Amorphous Alloys