Double functionalization strategy toward Co-Fe-P hollow nanocubes for highly efficient overall water splitting with ultra-low cell voltage

Zhu, Yuanxin; Zhang, Lei; Zhang, Xin; Li, Ziyao; Zha, Meng; Li, Meng; Hu, Guangzhi

doi:10.1016/j.cej.2020.127002

Cited by 83 publications

(29 citation statements)

References 78 publications

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“…Nyquist plots shown in Figure d reveal the smallest diameter of the semicircles for the Co@IC/MoC@PC catalyst, indicating its best charge-transfer behavior for ORR. , Next, to investigate the origins of the fast kinetics and striking ORR catalytic activity of Co@IC/MoC@PC, ultraviolet photoelectron spectroscopy was employed to evaluate the electron-donating abilities of the samples. As obviously seen in Figure , the Co@IC/MoC@PC catalyst shows an expected valence band maximum value of 0.13 eV, close to the Fermi level ( E F , set to 0 eV) and lower than 0.19 eV of Co@IC, implying that the exposed surfaces of Co@IC/MoC@PC nanocomposites possess more metallic character with higher density of states around E F . − Not surprisingly, the calculated working function of the Co@IC/MoC@PC is expected to be 4.19 eV, smaller than that of Co@IC catalyst. The work function is the energy barrier needed to liberate the electron from the semiconductor to the vacuum level and the gap between the vacuum level and the E F .…”

Section: Resultsmentioning

confidence: 89%

Co/MoC Nanoparticles Embedded in Carbon Nanoboxes as Robust Trifunctional Electrocatalysts for a Zn–Air Battery and Water Electrocatalysis

et al. 2021

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To meet the application needs of rechargeable Zn−air battery and electrocatalytic overall water splitting (EOWS), developing high-efficiency, cost-effective, and durable trifunctional catalysts for the hydrogen evolution reaction (HER), oxygen evolution, and reduction reaction (OER and ORR) is extremely paramount yet challenging. Herein, the interface engineering concept and nanoscale hollowing design were proposed to fabricate N-doping carbon nanoboxes confined with Co/MoC nanoparticles. Uniform zeolitic imidazolate framework nanocube was employed as the starting material to construct the trifunctional electrocatalyst through the conformal polydopamine−Mo layer coating and the subsequent pyrolysis treatment. The Co@IC/MoC@PC catalyst displayed superior electrochemical ORR performances with a positive half-wave potential of 0.875 V and a high limiting current density of 5.89 mA/cm 2 . When practically employed as an electrocatalyst in regenerative Zn−air battery, a high specific capacity of 728 mAh/g, a large peak power density of 221 mW/cm 2 , a high open-circuit voltage of 1.482 V, and a low charge/discharge voltage gap of 0.41 V were obtained. Moreover, its practicability was further exploited by overall water splitting, affording low overpotentials of 277 and 68 mV at 10 mA/cm 2 for the OER and HER in 1 M KOH solution, respectively, and a decent operating potential of 1.57 V for EOWS. Ultraviolet photoelectron spectroscopy and density functional theory calculation revealed that the Co/MoC interface synergistically facilitated the charge-transfer, thereby contributing to the enhancements of electrocatalytic ORR/OER/HER processes. More importantly, this catalyst design concept can offer some interesting prospects for the construction of outstanding trifunctional catalysts toward various energy conversion and storage devices.

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Section: Resultsmentioning

confidence: 89%

Co/MoC Nanoparticles Embedded in Carbon Nanoboxes as Robust Trifunctional Electrocatalysts for a Zn–Air Battery and Water Electrocatalysis

et al. 2021

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“…The NiCoSe NSs array derived from 2D ZIF-67 on NF through ion exchange followed by the hydrothermal process exhibits a multiporous framework with high ECSA, high conductivity, and open channels to release gaseous products during HER/OER processes. [23] In ZIF-67-derived 3D nanostructured electrocatalysts, polyhedrons, [184,185] spheres, [186,187] cubes, [188] and urchin [189] have been reported so far for electrochemical water splitting application. The 3D nanostructure can effectively hinder aggregation of nanomaterials, providing high ECSA with a high exposed active site and superior pathway for electron transfer.…”

Section: Morphology Controlmentioning

confidence: 99%

Critical Review, Recent Updates on Zeolitic Imidazolate Framework‐67 (ZIF‐67) and Its Derivatives for Electrochemical Water Splitting

et al. 2022

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High surface area provides abundant active sites for catalytic reaction High Surface area Open crystal structure can exposes more interior atoms to provide more active sites Open crystal structure Organic linker acts as source of nitrogen source to improve the conductivity of overall matrix Organic linker Metal nanoparticles and metal complexes can be encapsulated inside MOFs to form guest@MOFs Tunable pore structure Figure 2.Advantages of the ZIF-67 for electrocatalytic application. The schematics of ZIF-67 was reproduced under the terms of the CC BY license. [468]

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“…[439] As a bifunctional water electrolyzer, the Cu 2 O@Fe 2 O 3 @CC-500 requires a cell voltage of 1.675 V at 10 mA cm −2 and exhibited excellent stability. Moreover, the Co-P@IC/(Co-Fe)P@CC was fabricated with a thermal phosphorization route and exhibited small overpotentials of ≈174 and ≈53 mV at 10 mA cm -2 for the OER and HER in an alkaline media, respectively, and exhibited an ultralow operating cell voltage for overall water splitting of 1.46 V. [440] As shown in Figure 41ii, a bifunctional catalyst of Co 2 Cr 1 -P@3DGF prepared by phosphorization at 300 °C at 4 h under Ar, achieved remarkable electrocatalytic HER and OER activities in 1.0 m KOH, with a low overpotential of ≈118 and ≈270 mV to reach 10 mA cm −2 , respectively. [441] In addition, when applying Co 2 Cr 1 -P@3DGF as overall water splitting catalytic electrode in an alkaline condition, the required cell voltage at ≈10 mA cm −2 with ≈1.56 V. The superior performance was mainly attributed to the incorporation of a Cr into CoP and the high conductivity of the 3D graphene network substrate formed by thermal phosphidation.…”

Section: Effect Of Catalysts Processing Temperaturesmentioning

confidence: 99%

Developments and Perspectives on Robust Nano‐ and Microstructured Binder‐Free Electrodes for Bifunctional Water Electrolysis and Beyond

Chandrasekaran

Khandelwal

Fan

et al. 2022

Advanced Energy Materials

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Ni, Fe, and Cu foams to form robust binder-free electrodes for high-performance electrocatalytic reactions. [55][56][57][58][59] Interestingly, multidimensional electrocatalysts grown at the nanoscale on a range of current collectors, namely substrates and will benefit from a strong adhesion with the current collector to avoid catalyst delamination, limited active sites, and charge transfer blockage to enhance catalytic reactions (Figure 1b-d). [9,[60][61][62][63][64] Key Prospects, Insights, and the Dynamic Properties of Nano-and Microstructured Binder-Free Electrocatalysts and Their Direct Impact on Electrochemical ReactionsWater splitting has become one of the most important technologies to produce hydrogen (H 2 ) in high purity form. Water splitting includes two half-reactions, namely the cathodic HER and anodic OER. [8,65] Generally, the electrocatalytic performance and activity are highly sensitive to local reaction conditions and is largely valued by the energy required for adsorption/desorption of reaction intermediates and the rupture/creation of chemical bonds. Hence, the conventional powder form of precious metals such as Pt/C for the HER and RuO 2 or IrO 2 for the OER are considered ideal electrocatalysts. [66] In addition, several nonprecious 1D, 2D, and 3D nano-and microstructured powder catalysts such as MoS 2 , WS 2 , Ni 3 S 2 , NiCo 2 S 4 are also of interest for the HER and OER reactions. [54,[67][68][69][70][71][72][73][74] However, for commercial purposes and practical applica-

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Double functionalization strategy toward Co-Fe-P hollow nanocubes for highly efficient overall water splitting with ultra-low cell voltage

Cited by 83 publications

References 78 publications

Co/MoC Nanoparticles Embedded in Carbon Nanoboxes as Robust Trifunctional Electrocatalysts for a Zn–Air Battery and Water Electrocatalysis

Co/MoC Nanoparticles Embedded in Carbon Nanoboxes as Robust Trifunctional Electrocatalysts for a Zn–Air Battery and Water Electrocatalysis

Critical Review, Recent Updates on Zeolitic Imidazolate Framework‐67 (ZIF‐67) and Its Derivatives for Electrochemical Water Splitting

Developments and Perspectives on Robust Nano‐ and Microstructured Binder‐Free Electrodes for Bifunctional Water Electrolysis and Beyond

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