Tungsten-doped Ni–Co phosphides with multiple catalytic sites as efficient electrocatalysts for overall water splitting

Lu, Sen; Zhang, Liming; Dong, Yue; Zhang, Jiaqi; Yan, Xin-Tong; Sun, De-Fan; Shang, Xiao; Chi, Jing‐Qi; Chai, Yong‐Ming; Dong, Bin

doi:10.1039/c9ta03944a

Cited by 157 publications

(80 citation statements)

References 55 publications

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“…peaks. [41][42][43] Additionally, the the minor peaks at 853.77 and 872.07 eV are attributed to the metallic Ni. 44 Compared with Ni 2 P, the Ni 2p binding energy of P-NiFeP positive shifts of 0.97 eV ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of a porous NiFeP/Ni electrode for highly efficient hydrazine oxidation boosted H₂ evolution

Wang

Tao

2021

Nanoscale Adv.

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Section: Resultsmentioning

confidence: 99%

Fabrication of a porous NiFeP/Ni electrode for highly efficient hydrazine oxidation boosted H₂ evolution

Wang

Tao

2021

Nanoscale Adv.

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“…Generally, NiCoP is derived from NiCo oxide (NiCoO x ) via phosphorus substitution using chemical vapor deposition method, in which the morphology of NiCoP inherits from NiCoO x . [ 18,19,29,45–47 ] Recently, Guo et al reported a general wet‐chemical approach to synthesize large‐size, ultrathin 2D metal oxide nanosheets based on graphene oxide (GO) template, in which the nucleation and growth of metal ions are balanced during hydrolysis to prevent forming precipitates. [ 48 ] Based on this approach, only single‐metal oxide nanosheets with micron‐scale size and several nanometer‐thickness have been obtained.…”

Section: Introductionmentioning

confidence: 99%

Large‐Size, Porous, Ultrathin NiCoP Nanosheets for Efficient Electro/Photocatalytic Water Splitting

Yang³

et al. 2020

Adv Funct Materials

143

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Porous ultrathin 2D catalysts are attracting great attention in the field of electro/photocatalytic hydrogen evolution reaction (HER) and overall water splitting. Herein, a universal pH-controlled wet-chemical strategy is reported followed by thermal and phosphorization treatment to prepare large-size, porous and ultrathin bimetallic phosphide (NiCoP) nanosheets, in which graphene oxide is adopted as a template to determine the size of products. The thickness of the resultant NiCoP nanosheets ranges from 3.5 to 12.8 nm via delicately adjusting pH from 7.8 to 8.5. The thickness-dependent electrocatalytic performance is evidenced experimentally and explained by computational studies. The prepared large-size ultrathin NiCoP nanosheets show excellent bifunctional electrocatalytic activity for overall water splitting, with low overpotentials of 34.3 mV for HER and 245.0 mV for oxygen evolution reaction, respectively, at 10 mA cm −2 . Furthermore, the NiCoP nanosheets exhibit superior photocatalytic HER performance, achieving a high HER rate of 238.2 mmol h −1 g −1 in combination with commonly used photocatalyst CdS, which is far superior to that of Pt/CdS (81.7 mmol h −1 g −1 ). All these results demonstrate large-size porous ultrathin NiCoP nanosheets as an efficient and multifunctional electro/photocatalyst for water splitting.

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“…The parameter R ct relates to the overall rate in the OER process; a decrease in its value concerning increasing potential represents faster electron transfer kinetics. [56] At 1.54 V vs. RHE, W-doped NiÀ Fe hydroxides show smaller R ct than NiFe, which accounted for fast surface reactions for water oxidation. In the initial overpotential region, NiFeW2 presents the lowest R ct value, 1.56 Ω at 1.464 V vs. RHE, compared to those of NiFeW1 (2.23 Ω) and NiFeW3 (1.76 Ω), indicating accelerated charge transfer between the catalyst and substrate for faster OER kinetics.…”

Section: àmentioning

confidence: 96%

Electrodeposited Trimetallic NiFeW Hydroxide Electrocatalysts for Efficient Water Oxidation

et al. 2021

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Tungsten‐doped Ni−Fe hydroxides fabricated on a three‐dimensional nickel foam through cathodic electrodeposition are proposed as effective oxygen evolution reaction (OER) catalysts for alkaline water oxidation. Incorporating an adequate amount of W into Ni−Fe hydroxides modulates the electronic structure by changing the local environment of Ni and Fe and create oxygen vacancies, resulting in abundant active sites for the OER. The optimized electrocatalyst, with a substantial number of catalytic sites, is found to outperform the well‐established 20 wt% Ir/C electrocatalyst. The catalyst only requires small overpotentials of 224 mV and 251 mV to generate current densities of 10 mA cm−2 and 50 mA cm−2, respectively, at an extremely low Tafel slope. Surface study after long‐term chronopotentiometry (ca. 30 h) reveals that the tungsten dopant undergoes reduction to stabilize the Ni and Fe active sites for predominant water oxidation. This research provides new insight to apply optimum amounts of tungsten doping to enable more significant electronic coupling within Ni−Fe for the chemisorption of hydroxy and oxygen intermediates and greatly improved OER activity.

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Tungsten-doped Ni–Co phosphides with multiple catalytic sites as efficient electrocatalysts for overall water splitting

Abstract: The design of electrocatalysts including precious and nonprecious metals for the hydrogen evolution reaction (HER) in alkaline media remains challenging due to the sluggish reaction kinetics caused by the additional water dissociation step.

Cited by 157 publications

References 55 publications

Fabrication of a porous NiFeP/Ni electrode for highly efficient hydrazine oxidation boosted H₂ evolution

Fabrication of a porous NiFeP/Ni electrode for highly efficient hydrazine oxidation boosted H₂ evolution

Large‐Size, Porous, Ultrathin NiCoP Nanosheets for Efficient Electro/Photocatalytic Water Splitting

Electrodeposited Trimetallic NiFeW Hydroxide Electrocatalysts for Efficient Water Oxidation

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Tungsten-doped Ni–Co phosphides with multiple catalytic sites as efficient electrocatalysts for overall water splitting

Abstract: The design of electrocatalysts including precious and nonprecious metals for the hydrogen evolution reaction (HER) in alkaline media remains challenging due to the sluggish reaction kinetics caused by the additional water dissociation step.

Cited by 157 publications

References 55 publications

Fabrication of a porous NiFeP/Ni electrode for highly efficient hydrazine oxidation boosted H2 evolution

Fabrication of a porous NiFeP/Ni electrode for highly efficient hydrazine oxidation boosted H2 evolution

Large‐Size, Porous, Ultrathin NiCoP Nanosheets for Efficient Electro/Photocatalytic Water Splitting

Electrodeposited Trimetallic NiFeW Hydroxide Electrocatalysts for Efficient Water Oxidation

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Fabrication of a porous NiFeP/Ni electrode for highly efficient hydrazine oxidation boosted H₂ evolution

Fabrication of a porous NiFeP/Ni electrode for highly efficient hydrazine oxidation boosted H₂ evolution