Hierarchical structured CoP nanosheets/carbon nanofibers bifunctional eletrocatalyst for high-efficient overall water splitting

Xie, Xiao‐Qiao; Liu, Junpeng; Gu, Chaonan; Li, Jingjing; Zhao, Yan; Liu, Chun‐Sen

doi:10.1016/j.jechem.2021.05.020

Cited by 81 publications

(28 citation statements)

References 44 publications

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“…The increasingly serious dilemma about the depletion of traditional fossil fuels and its associated environmental pollution is obliging researchers to explore clean, efficient, and sustainable energy sources. Due to its zero-carbon emission and high energy value, H 2 has stood out from the crowd as an ideal alternative energy carrier to tackle environmental issues and energy crises. − Unfortunately, the current technologies for large-scale hydrogen production, such as reforming reaction and biohydrogen process, suffer from mass carbon emission or low conversion efficiency. , Water electrolysis triggered by electricity from solar and wind conversion is an efficient solution to develop a hydrogen economy at no environmental cost. The sluggish kinetics of the cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER) in water splitting seriously limit the rate of hydrogen generation, requiring highly efficient electrocatalysts .…”

Section: Introductionmentioning

confidence: 99%

Boosting Hydrogen Evolution Electrocatalysis via Regulating the Electronic Structure in a Crystalline–Amorphous CoP/CeO_x p–n Heterojunction

Song

Zhu

et al. 2022

ACS Appl. Mater. Interfaces

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The modulation of the electronic structure is the effective access to achieve highly active electrocatalysts for the hydrogen evolution reaction (HER). Transition-metal phosphide-based heterostructures are very promising in enhancing HER performance but the facile fabrication and an in-depth study of the catalytic mechanisms still remain a challenge. In this work, the catalytically inactive n-type CeO x is successfully combined with p-type CoP to form the CoP/CeO x heterojunction. The crystalline–amorphous CoP/CeO x heterojunction is fabricated by the phosphorization of predesigned Co(OH)2/CeO x via the as-developed reduction–hydrolysis strategy. The p–n CoP/CeO x heterojunction with a strong built-in potential of 1.38 V enables the regulation of the electronic structure of active CoP within the space–charge region to enhance its intrinsic activity and facilitate the electron transfer. The functional CeO x entity and the negatively charged CoP can promote the water dissociation and optimize H adsorption, synergistically boosting the electrocatalytic HER output. As expected, the heterostructured CoP/CeO x -20:1 with the optimal ratio of Co/Ce shows significantly improved HER activity and favorable kinetics (overpotential of 118 mV at a current density of 10 mA cm–2 and Tafel slope of 77.26 mV dec–1). The present study may provide new insight into the integration of crystalline and amorphous entities into the p–n heterojunction as a highly efficient electrocatalyst for energy storage and conversion.

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Section: Introductionmentioning

confidence: 99%

Boosting Hydrogen Evolution Electrocatalysis via Regulating the Electronic Structure in a Crystalline–Amorphous CoP/CeO_x p–n Heterojunction

Song

Zhu

et al. 2022

ACS Appl. Mater. Interfaces

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“…The ZIF-67 cubes were first prepared by previous literature and then assembled with PAN through the electrospinning method. The ZIF-67/NF film was acquired, in which the ZIF-67 and PAN were connected by the interaction of CN coordination. , Subsequently, the ZIF-67/NF was etched by immersing in Ni(NO 3 ) 2 ·6H 2 O with the interaction of nanoscale Kirkendall effect and the ion exchange reaction. The Ni(NO 3 ) 2 ·6H 2 O as Ni source and etchant became the second active sites to obtain NiCo-LDH/NF precursor.…”

Section: Resultsmentioning

confidence: 99%

ZIF-67-Derived (NiCo)S₂@NC Nanosheet Arrays Hybrid for Efficient Overall Water Splitting

Zheng

Zhu

et al. 2022

Inorg. Chem.

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Electrocatalytic water splitting is considered a promising approach to obtain clean and sustainable hydrogen energy. The integration of optimal nanoarchitecture and multicomponent synergy has been a significant factor for designing a bifunctional electrocatalyst to promote the cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER). In particular, the charge migration, mass transfer, and gas release rate in the catalyzing process are closely correlated with the architecture of the catalyst. Here, ZIF-67-derived N-doped carbon nanofiber-supported (NiCo)S2 nanosheet [(NiCo)S2/NCNF] as a bifunctional electrocatalyst was synthesized using electrospinning, template etching, and subsequent gas sulfidation method. The hierarchical hybrid nanofiber with inner hollow cubes and outer nanosheets provides easy electron penetration, high charge/mass transportation efficiency, and robust structure stability. Furthermore, the MOF-derived carbon-encapsuled bimetal-sulfide and the synergistic effect of double active centers are conducive to an exceptional performance, showing low overpotentials of 177 and 203 mV to drive a current density of 10 mA cm–2 and robust stability for the HER and OER, respectively. Meanwhile, the (NiCo)S2/NCNF electrodes exhibit a small voltage of 1.61 V for overall water splitting activity with an electrolyzer cell at current densities of 10 mA cm–2 over 12 h. This work presents novel insights into the bifunctional catalyst for promoting the overall water splitting via a MOF-derived nanoarchitecture and multicomponent synergy.

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“…The use of various carbon materials, such as graphene, 25 carbon nanotubes, 26 , 27 carbon paper, 28 carbon cloth, 29 and carbon fibers, 30 as catalyst carriers has been reported in the literature. For example, Xie et al 31 developed a CoP/CNF bifunctional catalyst by in situ growth of CoP nanosheets on the CNF substrate. The synergetic effect of two-dimensional CoP nanosheets and one-dimensional CNFs endowed the CoP/CNF composites with abundant active sites and rapid electron transport pathways and thereby significantly improved the electrocatalytic performances.…”

Section: Introductionmentioning

confidence: 99%

Construction of CoP/Co₂P Coexisting Bifunctional Self-Supporting Electrocatalysts for High-Efficiency Oxygen Evolution and Hydrogen Evolution

et al. 2022

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Development of a low cost, high activity, and stable nonprecious metal bifunctional catalyst for electrocatalytic water cracking is a hot topic and big challenge. In this paper, we prepared a nitrogen-doped carbon nanotube (NCNT)-enhanced three-dimensional self-supported electrocatalyst with CoP and Co 2 P coexistence by a two-step strategy of high-temperature carbonization and low-temperature phosphorylation. Furthermore, the induced three-dimensional carbon network skeleton facilitates rapid charge transfer. In addition, the active sites of the carbon foam (CF) are greatly increased by the construction of hollow structures. As a bifunctional electrocatalyst, CoP/Co 2 P/NCNT@CF exhibited excellent catalytic activity for both hydrogen evolution reaction and oxygen evolution reaction in alkaline media, requiring low overpotentials of 133 and 289 mV to obtain a current density of 10 mA cm –2 , respectively. Additionally, the synthesized catalysts also exhibit good long-term stability, maintaining high catalytic activity after 20 h of continuous operation. We also confirmed the main driving force to improve the electron transfer between the heterostructures of Co and P by XPS spectra. The excellent electrocatalytic performance can be attributed to the close synergy between the highly active CoP/Co 2 P/NCNT and CF. This study provides a new strategy for the design of highly active bifunctional self-supporting electrocatalysts.

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Hierarchical structured CoP nanosheets/carbon nanofibers bifunctional eletrocatalyst for high-efficient overall water splitting

Cited by 81 publications

References 44 publications

Boosting Hydrogen Evolution Electrocatalysis via Regulating the Electronic Structure in a Crystalline–Amorphous CoP/CeO_x p–n Heterojunction

Boosting Hydrogen Evolution Electrocatalysis via Regulating the Electronic Structure in a Crystalline–Amorphous CoP/CeO_x p–n Heterojunction

ZIF-67-Derived (NiCo)S₂@NC Nanosheet Arrays Hybrid for Efficient Overall Water Splitting

Construction of CoP/Co₂P Coexisting Bifunctional Self-Supporting Electrocatalysts for High-Efficiency Oxygen Evolution and Hydrogen Evolution

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Hierarchical structured CoP nanosheets/carbon nanofibers bifunctional eletrocatalyst for high-efficient overall water splitting

Cited by 81 publications

References 44 publications

Boosting Hydrogen Evolution Electrocatalysis via Regulating the Electronic Structure in a Crystalline–Amorphous CoP/CeOx p–n Heterojunction

Boosting Hydrogen Evolution Electrocatalysis via Regulating the Electronic Structure in a Crystalline–Amorphous CoP/CeOx p–n Heterojunction

ZIF-67-Derived (NiCo)S2@NC Nanosheet Arrays Hybrid for Efficient Overall Water Splitting

Construction of CoP/Co2P Coexisting Bifunctional Self-Supporting Electrocatalysts for High-Efficiency Oxygen Evolution and Hydrogen Evolution

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Boosting Hydrogen Evolution Electrocatalysis via Regulating the Electronic Structure in a Crystalline–Amorphous CoP/CeO_x p–n Heterojunction

Boosting Hydrogen Evolution Electrocatalysis via Regulating the Electronic Structure in a Crystalline–Amorphous CoP/CeO_x p–n Heterojunction

ZIF-67-Derived (NiCo)S₂@NC Nanosheet Arrays Hybrid for Efficient Overall Water Splitting

Construction of CoP/Co₂P Coexisting Bifunctional Self-Supporting Electrocatalysts for High-Efficiency Oxygen Evolution and Hydrogen Evolution