Metal-organic frameworks derived reverse-encapsulation Co-NC@Mo2C complex for efficient overall water splitting

Liang, Qirui; Jin, Huihui; Wang, Zhe; Xiong, Yuli; Yuan, Shuai; Zeng, Xierong; He, Daping; Mu, Shichun

doi:10.1016/j.nanoen.2018.12.060

Cited by 324 publications

(124 citation statements)

References 59 publications

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“…The value of I D /I G for Ni/MoN@NCNT/CC (1.18) is larger than that for Ni@NCNT/CC (1.13), indicating that more structural defects or higher disorder exist in the NCNT of Ni/MoN@NCNT/CC than in that of Ni@NCNT/CC. This might be ascribed to the process of co‐doping with N, Ni and MoN and the absence of part C atoms in the crystal structure of the NCNT, which could be beneficial to exposing more active sites.…”

Section: Resultsmentioning

confidence: 99%

N‐Doped Carbon Nanotubes Encapsulating Ni/MoN Heterostructures Grown on Carbon Cloth for Overall Water Splitting

Wang

et al. 2020

ChemElectroChem

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Herein, we reported a new strategy to grow N‐doped carbon nanotubes encapsulating Ni/MoN heterostructures on carbon cloth (Ni/MoN@NCNT/CC). The high intrinsic activity in the interface engineering of the Ni/MoN heterostructures, the high conductivity and protection of NCNT, and the three‐dimensional structure of the Ni/MoN@NCNT/CC contribute to its outstanding activity and stability for HER (overpotential of 207 mV at 10 mA cm−2) and OER (overpotential of 252 mV at 10 mA cm−2). Particularly, for HER, it can maintain a consistent potential at 100 mA cm−2 for 100 h. Besides, for OER the generated surface roughness and larger surface area can enhance OER activity of the catalyst. When used as a bifunctional electrocatalyst for overall water splitting, it can achieve a current density of 10 mA cm−2 at a cell voltage of 1.699 V with excellent durability. This work provides a new strategy to fabricate three‐dimensional heterostructured water‐splitting electrocatalysts with large surface area.

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Section: Resultsmentioning

confidence: 99%

N‐Doped Carbon Nanotubes Encapsulating Ni/MoN Heterostructures Grown on Carbon Cloth for Overall Water Splitting

Wang

et al. 2020

ChemElectroChem

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“…), but their high cost, supply scarcity, and poor bifunctional catalytic characters have greatly restricted their applications in ZABs . In response, various transition‐based catalysts with high activity and good durability have been explored, such as transition metal oxides, chalcogenides, and metal‐heteroatom doped carbon materials . Despite significant progress, current bifunctional catalysts are still facing the problems of insufficient activity and stability together with poor mass transport properties.…”

mentioning

confidence: 99%

Co Nanoislands Rooted on Co–N–C Nanosheets as Efficient Oxygen Electrocatalyst for Zn–Air Batteries

et al. 2019

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been devoted to various energy storage and conversion systems. [1,2] Metal-air batteries, especially Zn-air batteries (ZABs) have been regarded as a promising energy storage system due to their low-cost, high theoretical specific energy density (1084 Wh kg −1 ), and environmental friendliness. [3][4][5] Nevertheless, the multistep and proton-coupled electron transfer processes of the reversible oxygen reactions lead to sluggish kinetics for oxygen reduction (ORR) and oxygen evolution (OER) at aircathode, which are the bottlenecks of inefficient and unideal lifetime. [6] The current benchmark catalysts for simply ORR or OER are precious-metal-based catalysts (Pt, Ir, RuO 2 , etc.), but their high cost, supply scarcity, and poor bifunctional catalytic characters have greatly restricted their applications in ZABs. [7,8] In response, various transition-based catalysts with high activity and good durability have been explored, such as transition metal oxides, chalcogenides, and metal-heteroatom doped carbon materials. [9][10][11][12][13][14] Despite significant progress, current bifunctional catalysts are still facing the problems of insufficient activity and stability together with poor mass transport properties.Alternatively, metal-nitrogen-carbon (M-N-C) systems comprising the earth abundant transition metals and catalytic active metalN x centers with carbonized ligand have received growing interest due to their low cost and excellent catalytic activities. [15][16][17] Specially, Co-N-C has emerged as ORR catalyst for improvement the overall performance of ZABs. [18,19] Inspired by the excellent OER performance of Co-based catalysts (e.g., cobalt metal and cobalt oxide) and intrinsically electrical conductivity of Co metal, [20,21] so constructing hierarchical structure of Co-N-C contained Co metal maybe an effective way to promote the bifunctional ORR/OER activity. At present, various strategies have been applied to synthesize Co-N-C structures. Traditionally, carbonized the Co-based precursors (such as porphyrins and phthalocyanines) have been developed for several decades to synthesize metal contained N-doped carbon nanostructures, [22,23] but always suffer from large nanoparticles size and ununiformed structures. Hence, much efforts have been devoted to construct Co-N-C-based catalysts with novel morphology and structures, such as core-shell or single-atom dispersed Co-N-C catalysts combined with carbon nanotubes Developing non-precious-metal bifunctional oxygen reduction and evolution reaction (ORR/OER) catalysts is a major task for promoting the reaction efficiency of Zn-air batteries. Co-based catalysts have been regarded as promising ORR and OER catalysts owing to the multivalence characteristic of cobalt element. Herein, the synthesis of Co nanoislands rooted on Co-N-C nanosheets supported by carbon felts (Co/Co-N-C) is reported. Co nanosheets rooted on the carbon felt derived from electrodeposition are applied as the self-template and cobalt source. The synergistic effect of metal Co islands with OER a...

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“…XPS is used to investigate the chemical states and composition of the IN‐PSNCs‐X. In the high‐resolution Co 2p spectra for IN‐PSNCs‐2, IN‐PSNCs‐3 and IN‐PSNCs‐5 (Figure a), two pairs of peaks for Co 3+ and Co 2+ can be observed . In addition, the portion of Co 3+ gradually increases with the S content, demonstrating that the S content of H‐SNCs‐X affects the chemical valence of Co ion in IN‐PSNCs‐X.…”

Section: Resultsmentioning

confidence: 99%

Microstructural Engineering of Heterogeneous P−S−Co Interface for Oxygen and Hydrogen Evolution

Wang

et al. 2019

ChemElectroChem

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Fabricating and engineering heterointerface was an effective approach to improve electrochemical activity of catalysts through modulating their atomic arrangement and chemical states. Herein, cobalt phosphide and cobalt sulfide (CoP/CoS x ) heterostructure hollow nanocones were fabricated by an in situ ion intercalation template-assisted method. The microstructure of the heterointerface could be adjusted by changing the molar ratio of S/P. Electrochemical investigation revealed that the disordered structures at the heterointerface could influence the catalytic behavior of active sites. Rationally engineering the disordered structure could improve the electrocatalytic activity for oxygen and hydrogen evolution reactions (OER/HER). The optimized CoP/CoS x heterostructure exhibited favorable catalytic activity for OER, which delivered an overpotential at 10 mA cm À 2 of 313 mV and a Tafel slope (93 mV dec À 1 ) in alkaline media. Meanwhile, the optimized CoP/CoS x heterostructure also exhibited superior HER performance under acidic condition.

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Metal-organic frameworks derived reverse-encapsulation Co-NC@Mo2C complex for efficient overall water splitting

Cited by 324 publications

References 59 publications

N‐Doped Carbon Nanotubes Encapsulating Ni/MoN Heterostructures Grown on Carbon Cloth for Overall Water Splitting

N‐Doped Carbon Nanotubes Encapsulating Ni/MoN Heterostructures Grown on Carbon Cloth for Overall Water Splitting

Co Nanoislands Rooted on Co–N–C Nanosheets as Efficient Oxygen Electrocatalyst for Zn–Air Batteries

Microstructural Engineering of Heterogeneous P−S−Co Interface for Oxygen and Hydrogen Evolution

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