Scanty graphene-driven phase control and heteroatom functionalization of ZIF-67-derived CoP-draped N-doped carbon/graphene as a hybrid electrode for high-performance asymmetric supercapacitor

Gayathri, Sampath; Arunkumar, Paulraj; Han, Jong Hun

doi:10.1016/j.jcis.2020.08.096

Cited by 45 publications

(17 citation statements)

References 39 publications

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“…Moreover, the presence of nitrogen in the N−RGO analogue denotes the nitrogen doping into graphene sheets. The high‐resolution Co2p spectrum revealed two sets (Co2p 3/2 and Co2p 1/2 ) of five peaks corresponding to metallic cobalt (777.9 and 792.6 eV), Co−P (779.2 and 793.6 eV) and the oxidized Co species (781.5 and 796.3 eV), whereas the remaining peaks were satellite peaks denoted as “Sat.” (Figure 3b) [29] . The high‐resolution Ni2p spectrum exhibited features of metallic nickel (853.1 and 870 eV) and Ni−P species (855.1 and 872.2 eV) attributed to Ni2p 3/2 and Ni2p 1/2 peaks, respectively, along with the satellite peaks (Figure 3c).…”

Section: Resultsmentioning

confidence: 94%

“…There is no substantial shift in the Co2p and Ni2p XPS peaks between CoNiP/CoNi and its N−RGO analogues. In the P2p spectrum, the peak at 129.5 eV can be assigned to metal phosphide (M−P; Figure 3d) [30] . Additional peaks at 134.7 and 138.5 eV is attributed to different chemical environments of oxidized P (phosphate‐like) species namely tetra‐coordinated P (PO 4 3− ) and polyphosphate with P−O−P bonds (P 4 O 10 ), respectively, due to surface oxidation of phosphide on contact with air [31,32] .…”

Section: Resultsmentioning

confidence: 99%

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A Complementary Co−Ni Phosphide/Bimetallic Alloy‐Interspersed N‐Doped Graphene Electrocatalyst for Overall Alkaline Water Splitting

2021

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Echinops‐like bimetallic CoNiP−CoNi alloy is synthesized from a metal−organic framework (MOF) and serves as an efficient catalyst for the oxygen evolution reaction (OER), with a low overpotential of 300 mV in 1 M KOH at 10 mA cm−2 (η10). The cooperative effect of Ni and Co metal, as well as the interfacial properties of the integrated semiconducting phosphide/metallic alloy and electronic conductivity of the MOF‐derived carbon regulate the performance of the catalyst. Moreover, the bimetallic CoNiP/CoNi alloy catalyst is interspersed with N‐doped graphene, forming a triad catalyst that demonstrates superior activity towards the hydrogen evolution reaction (η10=150 mV) and excellent durability, owing to interfacial effects of the triad catalyst, large electrochemical active surface area, and enhanced conductivity from N‐doped graphene. The stability of the carbon‐containing catalyst during OER (oxidation) is altered by the high reactivity of heteroatom dopant. The assembled CoNiP/CoNi/N−RGO||CoNiP/CoNi water electrolyzer delivers a reasonable cell potential of 1.76 V at 10 mA cm−2. The synthesized bimetallic CoNiP/CoNi alloy‐based triad catalyst thus demonstrates excellent electrocatalytic activity and high durability suitable for efficient alkaline water splitting.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

A Complementary Co−Ni Phosphide/Bimetallic Alloy‐Interspersed N‐Doped Graphene Electrocatalyst for Overall Alkaline Water Splitting

2021

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“…45-0937) were observed, demonstrating conversion of Cu(OH) 2 into CuO after calcination treatment . ZIF-67 powder well matched the simulated ZIF-67 . CuO/CF@Co 3 O 4 reveals the characteristics of Co 3 O 4 (JCPDS No.…”

Section: Resultsmentioning

confidence: 53%

“…42 ZIF-67 powder well matched the simulated ZIF-67. 43 CuO/CF@Co 3 O 4 reveals the characteristics of Co 3 O 4 (JCPDS No. 431003) as well as displays obvious characteristic peaks at 36.94 and 61.43, related to the (311) and (511) crystal faces.…”

Section: Resultsmentioning

confidence: 99%

Metal–Organic Framework (MOF)-Assisted Construction of Core–Shell Nanoflower-like CuO/CF@NiCoMn–OH for High-Performance Supercapacitor

Lei

Zhang

et al. 2021

Energy Fuels

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Urgent requests for environmentally friendly clean energy and the development of modern electronic products have resulted in fervent research on novel energy storage technologies, particularly for supercapacitors. But supercapacitors suffer from low energy densities, restricting their development. In order to obtain high performance supercapacitors with a high energy density and power density, the indispensable factor is designing electrode materials with excellent capacitive performance. We have successfully prepared innovative materials and unique structures to apply in high-performance supercapacitors. The nanowire is good for making close contact with the electrolyte for fast ion diffusion, and the nanoflower sheet enables shortening the electron convey route and provides a number of reaction active sites. Herein, we use copper foam (CF) as the substrate, and binder-free core–shell nanoflower-like CuO/CF@NiCoMn–OH is designed as a battery-style positive electrode. Benefiting from the advantages of a metal–organic framework (MOF)-assisted growth strategy and simple hydrothermal dynamics, the prepared optimizing electrode structure delivers a distinguished specific capacity of 26.8 F cm–2 at 8 mA cm–2 (3356 F g–1 at 1 A g–1). The assembled CuO/CF@NiCoMn–OH//AC exhibits a high energy density of 37.28 W h kg–1 and a power density of 170 W kg–1, under a potential window of 1.5 V. This work implies that MOF-assisted construction of core–shell nanoflower-like CuO/CF@NiCoMn–OH has broad application prospects in high-performance energy storage equipment.

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“…9f, the P-ZIF-67//AC device presents an energy density of 19.7 W h kg À1 at a power density of 500 W kg À1 , which also has certain advantages compared with the similar work reported. [57][58][59][60][61] In short, the phosphating treatment improves the conductivity performance and optimizes the aperture structure of ZIF-67, while the asymmetric assembly expands the operating voltage window of the device; thus the resulting P-ZIF-67//AC supercapacitor exhibits good power density and energy density.…”

Section: Resultsmentioning

confidence: 99%

The methodologically obtained derivative of ZIF-67 metal–organic frameworks present impressive supercapacitor performance

et al. 2022

New J. Chem.

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Scanty graphene-driven phase control and heteroatom functionalization of ZIF-67-derived CoP-draped N-doped carbon/graphene as a hybrid electrode for high-performance asymmetric supercapacitor

Cited by 45 publications

References 39 publications

A Complementary Co−Ni Phosphide/Bimetallic Alloy‐Interspersed N‐Doped Graphene Electrocatalyst for Overall Alkaline Water Splitting

A Complementary Co−Ni Phosphide/Bimetallic Alloy‐Interspersed N‐Doped Graphene Electrocatalyst for Overall Alkaline Water Splitting

Metal–Organic Framework (MOF)-Assisted Construction of Core–Shell Nanoflower-like CuO/CF@NiCoMn–OH for High-Performance Supercapacitor

The methodologically obtained derivative of ZIF-67 metal–organic frameworks present impressive supercapacitor performance

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