N-Carbon coated P-W<sub>2</sub>C composite as efficient electrocatalyst for hydrogen evolution reactions over the whole pH range

Yan, Gang; Wu, C.L.; Tan, Huaqiao; Feng, Xuechao; Yan, Lingling; Zang, Hong‐Ying; Li, Yangguang

doi:10.1039/c6ta09052d

Cited by 197 publications

(103 citation statements)

References 48 publications

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“…Notably, the N 1s peak of the Carbon‐PMo 12 composite (Figure e) can be divided into three peaks at 402.7, 400.8, and 398.5 eV, which correspond to graphitic‐N, pyrrolic‐N, and pyridinic‐N species, respectively . The C 1s peaks of the Carbon‐PMo 12 located at 289.1, 285.8, and 284.8 eV (Figure S3) were characteristic of C−N, C=N, and C−C/C=C, respectively . Compared with PMo 12 , the Mo peak of the Carbon‐PMo 12 shifted toward lower binding energy, suggesting electrostatic interactions between the PMo 12 clusters and carbon substrate …”

Section: Resultsmentioning

confidence: 98%

Three‐Dimensional Carbon Framework Anchored Polyoxometalate as a High‐Performance Anode for Lithium‐Ion Batteries

Jia

Wang

et al. 2020

Chemistry A European J

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Recently,i th as become very important to develop cost-effective anode materials for the large-scale use of lithium-ion batteries (LIBs). Polyoxometalates (POMs) have been considered as one of the most promisinga lternatives for LIB electrodes owing to their reversible multi-electron-transfer capacity.H erein, Keggin-type [PMo 12 O 40 ] 3À (donated as PMo 12 )c lusters are anchored onto a3 Dm icroporous carbon framework derived from ZIF-8 through electrostatic interactions. TheP Mo 12 clusters can be immobilizeds teadily and uniformly on the carbon framework, which provides enhanced electrical conductivity andh igh stability.C ompared with PMo 12 itself, the as-prepared novel 3D Carbon-PMo 12 composite displays as ignificantly improved Li-ion storage performance as an LIB anode,w ith excellent reversible specific capacity and rate capacity,a sw ell as high cycling performance (discharge capacity of 985 mA hg À1 after 200 cycles), which are superior to other POM-based anode materials reporteds of ar.T he high performance of the Carbon-PMo 12 composite can be attributed to the 3D conductiven etwork with fast electront ransport, high ratio of pseudocapacitive contribution, and evenly distributed PMo 12 clusters with reversible 24-electron transfer capacity.T his work offers af acile way to explore novel LIB anodes consisting of electroactive molecule clusters.

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Section: Resultsmentioning

confidence: 98%

Three‐Dimensional Carbon Framework Anchored Polyoxometalate as a High‐Performance Anode for Lithium‐Ion Batteries

Jia

Wang

et al. 2020

Chemistry A European J

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“…Because the impedance data of other catalysts also fit in the equivalent circuit, the smaller the R ct , the better the electrical conductivity, and hence the better the HER performance. It can be seen that Co 2 P@N,P‐C/CG had the smallest R ct of 2.54 Ω among all catalysts (at 0.1 V vs. RHE), which may be because 1) the introduction of RGO could improve the conductivity, 2) the N,P‐dopants improve the graphitization degree of the carbon materials, 3) the Co 2 P exhibits metallic properties with a higher conductivity, or 4) the C shell can enhance interfacial electron transfer in the morphology of Co 2 P cores and a C shell . Recently, some reports have suggested that the Tafel slope derived from the polarization curve may contain the contribution of the electron transport process, whereas the Tafel slopes obtained from the impedance data can completely consider the charge transfer kinetics.…”

Section: Resultsmentioning

confidence: 99%

Encapsulating Co₂P@C Core–Shell Nanoparticles in a Porous Carbon Sandwich as Dual‐Doped Electrocatalyst for Hydrogen Evolution

Yang

Liang

et al. 2018

ChemSusChem

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A highly efficient and pH-universal hydrogen evolution reaction (HER) electrocatalyst with a sandwich-architecture constructed using zero-dimensional N- and P-dual-doped core-shell Co P@C nanoparticles embedded into a 3 D porous carbon sandwich (Co P@N,P-C/CG) was synthesized through a facile two-step hydrothermal carbonization and pyrolysis method. The interfacial electron transfer rate and the number of active sites increased owing to the synergistic effect between the N,P-dual-doped Co P@C core-shell and sandwich-nanostructured substrates. The presence of a high surface area and large pore sizes improved the mass-transfer dynamics. This nanohybrid showed remarkable electrocatalytic activity toward the HER in a wide pH range with good stability. The computational study and experiments revealed that the carbon atoms close to the N and P dopants on the shell of Co P@N,P-C were effective active sites for HER catalysis and that both Co P and the N,P dopants gave rise to an optimized binding free energy of H on the active sites.

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“…[53][54][55][56] POMs can not only give rise to an assembly of catalytically active metal and nonmetal elements into one nanoscale cluster,b ut they can also be easily dispersed in variousc arbon sourceso wing to their high negative charge, whichi sb eneficial for uniform carbonization, phosphorization,o rn itrogenization in confined spaces. In the last three years, as eries of transition-metal carbides, nitrides, and phosphides have been prepared by using POM precursors, [57][58][59][60][61][62] suggesting af easible strategyf or the construction of nano-heterojunctions. Herein, we report an ew type of nano-heterojunction that consists of cobalt phosphide and tungsten carbide composite phases covered by few-layer N-doped graphitic carbon shells (Co 2 P/ WC@NC).…”

Section: Introductionmentioning

confidence: 99%

A Co₂P/WC Nano‐Heterojunction Covered with N‐Doped Carbon as Highly Efficient Electrocatalyst for Hydrogen Evolution Reaction

Gao

Lang

et al. 2018

ChemSusChem

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The hydrogen evolution reaction (HER) produces clean hydrogen through an electrochemical process. However, new nonprecious-metal electrocatalysts for the HER are required to reduce the consumption of energy. Herein, we report a new Co P/WC nano-heterojunction that consists of Co P and WC composite phases coated with a few-layer N-doped graphitic carbon shells (Co P/WC@NC). The composite was prepared by a one-step annealing of the polyoxometalate Na (NH ) [{(B-α-PW O )Co (OH)(H O) (Ale)} Co]⋅35 H O (Co P W ) and dicyandiamide (DCA). The preparation method consisted of the simultaneous phosphorization of Co and carbonization of W in a confined space to isolate a Co P/WC nano-heterojunction phase for the first time. Co P/WC@NC facilitated the generation of hydrogen in the electrolysis process, which had an overpotential of only 91 mV at a current density of 10 mA cm in the acid solution; an excellent HER performance (2 H +2 e →H ) and Tafel slope (40 mV dec ) as well as durability over a period of 50 h were achieved. Theoretical calculations showed that the Co P, WC, and N C dopants in the material synergistically promoted the HER activity rather than the individual constituents. Furthermore, Co P/WC@NC nano-heterojunctions showed good HER performance in the whole pH range of electrolytes and considerable durability in acidic media containing transition metal ions, which may attract more attention for the exploration and optimization of nano-heterojunction catalysts for the HER.

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N-Carbon coated P-W₂C composite as efficient electrocatalyst for hydrogen evolution reactions over the whole pH range

Abstract: A N-carbon coated P-modified W2C composite (P-W2C@NC), prepared by annealing a mixture of H3PW12O40and dicyandiamide, exhibits excellent HER electrocatalytic activity and durability over the whole pH range.

Cited by 197 publications

References 48 publications

Three‐Dimensional Carbon Framework Anchored Polyoxometalate as a High‐Performance Anode for Lithium‐Ion Batteries

Three‐Dimensional Carbon Framework Anchored Polyoxometalate as a High‐Performance Anode for Lithium‐Ion Batteries

Encapsulating Co₂P@C Core–Shell Nanoparticles in a Porous Carbon Sandwich as Dual‐Doped Electrocatalyst for Hydrogen Evolution

A Co₂P/WC Nano‐Heterojunction Covered with N‐Doped Carbon as Highly Efficient Electrocatalyst for Hydrogen Evolution Reaction

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N-Carbon coated P-W2C composite as efficient electrocatalyst for hydrogen evolution reactions over the whole pH range

Abstract: A N-carbon coated P-modified W2C composite (P-W2C@NC), prepared by annealing a mixture of H3PW12O40and dicyandiamide, exhibits excellent HER electrocatalytic activity and durability over the whole pH range.

Cited by 197 publications

References 48 publications

Three‐Dimensional Carbon Framework Anchored Polyoxometalate as a High‐Performance Anode for Lithium‐Ion Batteries

Three‐Dimensional Carbon Framework Anchored Polyoxometalate as a High‐Performance Anode for Lithium‐Ion Batteries

Encapsulating Co2P@C Core–Shell Nanoparticles in a Porous Carbon Sandwich as Dual‐Doped Electrocatalyst for Hydrogen Evolution

A Co2P/WC Nano‐Heterojunction Covered with N‐Doped Carbon as Highly Efficient Electrocatalyst for Hydrogen Evolution Reaction

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N-Carbon coated P-W₂C composite as efficient electrocatalyst for hydrogen evolution reactions over the whole pH range

Encapsulating Co₂P@C Core–Shell Nanoparticles in a Porous Carbon Sandwich as Dual‐Doped Electrocatalyst for Hydrogen Evolution

A Co₂P/WC Nano‐Heterojunction Covered with N‐Doped Carbon as Highly Efficient Electrocatalyst for Hydrogen Evolution Reaction