Fe and P Doped 1T-Phase Enriched WS23D-Dendritic Nanostructures for Efficient Overall Water Splitting

Paudel, Dasu Ram; Pan, Uday Narayan; Singh, Thangjam Ibomcha; Gudal, Chandan Chandru; Kim, Nam Hoon; Lee, Joong Hee

doi:10.1016/j.apcatb.2021.119897

Cited by 105 publications

(64 citation statements)

References 37 publications

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“…In the P 2p spectrum, the peaks at 129.7 and 130.3 eV were ascribed to P 2p 3/2 and P 2p 1/2 . Compared with the Ni 3 P-Ni/CNTs, the binding energy of P 2p for N-Ni 3 P-Ni/N-CNTs shifted to the negative binding energy, attributing to the variation of electron density around surface P sites. − Besides, the peak intensity of P–O in N-Ni 3 P-Ni/N-CNTs was significantly lower than the peak intensity of P–O in Ni 3 P-Ni/CNTs. In this network structure (N-Ni 3 P-Ni/N-CNTs), these nanoparticles were preserved in carbon shells of bamboo-like N-CNTs, which could avoid the direct contact of nanoparticles with oxygen, so that the catalyst had a rather high stability. , The total N content was observed at about 11.76 atom % in the N-Ni 3 P-Ni/N-CNTs.…”

Section: Resultsmentioning

confidence: 97%

Porous Ni Foams Filled by N-Doped Carbon Nanotubes Coated with N-Doped Ni₃P and Ni Nanoparticles for Catalytic Water Splitting

Wang

et al. 2021

ACS Appl. Nano Mater.

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The development of bifunctional catalysts possessing high efficiency and excellent stability was still a challenge as regards overall water splitting. Herein, a reasonable space division strategy of Ni foam (NF) was proposed to design a bifunctional catalyst. Ni-P alloy was loaded on carbon nanotubes (CNTs) through Pd-free electroless plating (Ni-P/CNTs). Subsequently, the Ni-P/CNT catalysts mixed with melamine were annealed for N doping. The N-doped CNTs coated with N-doped Ni3P and Ni nanoparticles (N-Ni3P-Ni/N-CNTs) were obtained. Finally, the N-Ni3P-Ni/N-CNTs were used as a filler to divide the pore size of NF by electroplating Ni, obtaining a network-like hierarchical porous electrode (N-Ni3P-Ni/N-CNTs/NF). This hierarchical porous structure exposed abundant catalytically active sites, facilitated the mass transfer, and prevented the catalyst agglomeration and corrosion that promote electrolyte contact and favor facile electron transfer kinetics. On the basis of the rational design, a self-supported N-Ni3P-Ni/N-CNTs/NF electrode showed a high specific surface area and exhibited superior electrocatalytic performances. The electrode achieved low overpotential of 73 and 270 mV at 10 mA cm–2 for the hydrogen and oxygen evolution reaction, respectively. Besides, it required a cell voltage of only 1.57 V to achieve 20 mA cm–2 when assembled in a 1 M KOH electrolyte for overall water splitting. Hence, this study represented a rational design of self-supported bifunctional electrode for overall water splitting.

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Section: Resultsmentioning

confidence: 97%

Porous Ni Foams Filled by N-Doped Carbon Nanotubes Coated with N-Doped Ni₃P and Ni Nanoparticles for Catalytic Water Splitting

Wang

et al. 2021

ACS Appl. Nano Mater.

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“…When Fe was introduced, EIS results (Figure 4d) reveal that the charge transfer resistances of V-FeNi 3 N/Ni 3 N (3.5 Ω) and FeNi 3 N/Ni 3 N (9.5 Ω) are less than those of V-Ni 3 N (33.1 Ω), and Ni 3 N (60.1 Ω), revealing that Fe-doping could enhance the electrical conductivities of V-FeNi 3 N/Ni 3 N and FeNi 3 N/Ni 3 N at the electrode/electrolyte interface. 76 The C dl value of V-FeNi 3 N/Ni 3 N is 11.8 mF cm −2 and larger than that of FeNi 3 N/Ni 3 N (7.7 mF cm −2 ) (Figure S13), implying that V-FeNi 3 N/Ni 3 N has a larger active surface area and could provide more active sites than FeNi 3 N/ Ni 3 N for the OER. 77 Besides, the durability of V-FeNi 3 N/ Ni 3 N was measured by a multi-step current density approach, from 10 to 20, 50, and 100 and then back to 50 and 10 mA cm −2 with 10 h running at each step.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…A smaller Tafel slope confirms that V-FeNi 3 N/Ni 3 N has a more rapid OER kinetic process. When Fe was introduced, EIS results (Figure d) reveal that the charge transfer resistances of V-FeNi 3 N/Ni 3 N (3.5 Ω) and FeNi 3 N/Ni 3 N (9.5 Ω) are less than those of V-Ni 3 N (33.1 Ω), and Ni 3 N (60.1 Ω), revealing that Fe-doping could enhance the electrical conductivities of V-FeNi 3 N/Ni 3 N and FeNi 3 N/Ni 3 N at the electrode/electrolyte interface . The C dl value of V-FeNi 3 N/Ni 3 N is 11.8 mF cm –2 and larger than that of FeNi 3 N/Ni 3 N (7.7 mF cm –2 ) (Figure S13), implying that V-FeNi 3 N/Ni 3 N has a larger active surface area and could provide more active sites than FeNi 3 N/Ni 3 N for the OER .…”

Section: Resultsmentioning

confidence: 99%

Vanadium-Doping and Interface Engineering for Synergistically Enhanced Electrochemical Overall Water Splitting and Urea Electrolysis

Wang

Sun

et al. 2021

ACS Appl. Mater. Interfaces

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Fabricating effective non-precious metal-based catalysts for hydrogen production via electrochemical water splitting is of considerable importance but remains challenging. Transition metal nitrides possessing metallic character and corrosion resistance have been considered as potential replacements for precious metals. However, their activities for water electrolysis are impeded by the strong hydrogen adsorption and low water adsorption energies. Herein, V-doped bimetallic nitrides, V-FeNi3N/Ni3N heterostructure, are synthesized via a hydrothermal–nitridation protocol and used as electrocatalysts for water splitting and urea electrolysis. The V-FeNi3N/Ni3N electrode exhibits superior HER and OER activities, and the overpotentials are 62 and 230 mV to acquire a current density of 10 mA cm–2, respectively. Moreover, as a bifunctional electrocatalyst for overall water splitting, a two-electrode device needs a voltage of 1.54 V to reach a current density of 10 mA cm–2. The continuous electrolysis can be run for more than 120 h, surpassing most previously reported electrocatalysts. The excellent performance for water electrolysis is dominantly due to V-doping and interface engineering, which could enhance water adsorption and regulate the adsorption/desorption of intermediates species, thereby accelerating HER and OER kinetic processes. Besides, a urea-assisted two-electrode electrolyzer for electrolytic hydrogen production requires a cell voltage of 1.46 V at 10 mA cm–2, which is 80 mV lower than that of traditional water electrolysis.

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“…[12] The OER performance is heavily influenced by water-adsorption capability and the electrical conductivity of the catalysts, which are strongly correlated to their electronic configurations, especially the electron delocalization. [12][13][14] In this regard, defect engineering has been adopted as a potential approach to cause electron delocalization. [13] Currently, as one of the most studied types of defect engineering, oxygen vacancy creations in transition metal oxides can facilitate electrochemical water splitting by activating the neighboring atoms, causing the antibonding orbitals to shift upward toward the Fermi level, thereby providing extra electronic states around the Fermi level and increasing the reactivity of the catalytically active sites.…”

Section: Introductionmentioning

confidence: 99%

Alkaline Water Splitting Enhancement by MOF‐Derived Fe–Co–Oxide/Co@NC‐mNS Heterostructure: Boosting OER and HER through Defect Engineering and In Situ Oxidation

Singh

Rajeshkhanna

Pan

et al. 2021

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Introducing defects and in situ topotactic transformation of the electrocatalysts generating heterostructures of mixed‐metal oxides(hydroxides) that are highly active for oxygen evolution reaction (OER) in tandem with metals of low hydrogen adsorption barrier for efficient hydrogen evolution reaction (HER) is urgently demanded for boosting the sluggish OER and HER kinetics in alkaline media. Ascertaining that, metal–organic‐framework‐derived freestanding, defect‐rich, and in situ oxidized Fe–Co–O/Co metal@N‐doped carbon (Co@NC) mesoporous nanosheet (mNS) heterostructure on Ni foam (Fe–Co–O/Co@NC‐mNS/NF) is developed from the in situ oxidation of micropillar‐like heterostructured Fe–Co–O/Co@NC/NF precatalyst. The in situ oxidized Fe–Co–O/Co@NC‐mNS/NF exhibits excellent bifunctional properties by demanding only low overpotentials of 257 and 112 mV, respectively, for OER and HER at the current density of 10 mA cm−2, with long‐term durability, attributed to the existence of oxygen vacancies, higher specific surface area, increased electrochemical active surface area, and in situ generated new metal (oxyhydr)oxide phases. Further, Fe–Co–O/Co@NC‐mNS/NF (+/−) electrolyzer requires only a low cell potential of 1.58 V to derive a current density of 10 mA cm−2. Thus, the present work opens a new window for boosting the overall alkaline water splitting.

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Fe and P Doped 1T-Phase Enriched WS23D-Dendritic Nanostructures for Efficient Overall Water Splitting

Cited by 105 publications

References 37 publications

Porous Ni Foams Filled by N-Doped Carbon Nanotubes Coated with N-Doped Ni₃P and Ni Nanoparticles for Catalytic Water Splitting

Porous Ni Foams Filled by N-Doped Carbon Nanotubes Coated with N-Doped Ni₃P and Ni Nanoparticles for Catalytic Water Splitting

Vanadium-Doping and Interface Engineering for Synergistically Enhanced Electrochemical Overall Water Splitting and Urea Electrolysis

Alkaline Water Splitting Enhancement by MOF‐Derived Fe–Co–Oxide/Co@NC‐mNS Heterostructure: Boosting OER and HER through Defect Engineering and In Situ Oxidation

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Fe and P Doped 1T-Phase Enriched WS23D-Dendritic Nanostructures for Efficient Overall Water Splitting

Cited by 105 publications

References 37 publications

Porous Ni Foams Filled by N-Doped Carbon Nanotubes Coated with N-Doped Ni3P and Ni Nanoparticles for Catalytic Water Splitting

Porous Ni Foams Filled by N-Doped Carbon Nanotubes Coated with N-Doped Ni3P and Ni Nanoparticles for Catalytic Water Splitting

Vanadium-Doping and Interface Engineering for Synergistically Enhanced Electrochemical Overall Water Splitting and Urea Electrolysis

Alkaline Water Splitting Enhancement by MOF‐Derived Fe–Co–Oxide/Co@NC‐mNS Heterostructure: Boosting OER and HER through Defect Engineering and In Situ Oxidation

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Porous Ni Foams Filled by N-Doped Carbon Nanotubes Coated with N-Doped Ni₃P and Ni Nanoparticles for Catalytic Water Splitting

Porous Ni Foams Filled by N-Doped Carbon Nanotubes Coated with N-Doped Ni₃P and Ni Nanoparticles for Catalytic Water Splitting