Construction of hierarchical Ni–Co–P hollow nanobricks with oriented nanosheets for efficient overall water splitting

Hu, Enlai; Yan, Feng; Nai, Jianwei; Zhao, Dian; Hu, Yong; Lou, Xiong Wen David

doi:10.1039/c8ee00076j

Cited by 764 publications

(379 citation statements)

References 72 publications

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“…For example, Ni‐based sulfides and phosphides were synthesized for the electrocatalytic HER, and Ni‐based oxides and hydroxides exhibited electrochemical oxygen evolution activities . Since the overall water splitting is critical in the practical application, it is desired to develop bifunctional electrocatalysts . Recently, several Ni‐based nanomaterials have been prepared and exhibited bifunctional electrocatalytic activities in HER and OER .…”

Section: Figurementioning

confidence: 99%

Ultrathin Ni(0)‐Embedded Ni(OH)₂ Heterostructured Nanosheets with Enhanced Electrochemical Overall Water Splitting

et al. 2020

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The efficiency of splitting water into hydrogen and oxygen is highly dependent on the catalyst used. Herein, ultrathin Ni(0)‐embedded Ni(OH)2 heterostructured nanosheets, referred to as Ni/Ni(OH)2 nanosheets, with superior water splitting activity are synthesized by a partial reduction strategy. This synthetic strategy confers the heterostructured Ni/Ni(OH)2 nanosheets with abundant Ni(0)‐Ni(II) active interfaces for hydrogen evolution reaction (HER) and Ni(II) defects as transitional active sites for oxygen evolution reaction (OER). The obtained Ni/Ni(OH)2 nanosheets exhibit noble metal‐like electrocatalytic activities toward overall water splitting in alkaline condition, to offer 10 mA cm−2 in HER and OER, the required overpotentials are only 77 and 270 mV, respectively. Based on such an outstanding activity, a water splitting electrolysis cell using the Ni/Ni(OH)2 nanosheets as the cathode and anode electrocatalysts has been successfully built. When the output voltage of the electrolytic cell is 1.59 V, a current density of 10 mA cm−2 can be obtained. Moreover, the durability of Ni/Ni(OH)2 nanosheets in the alkaline electrolyte is much better than that of noble metals. No obvious performance decay is observed after 20 h of catalysis. This facile strategy paves the way for designing highly active non‐precious‐metal catalyst to generate both hydrogen and oxygen by electrolyzing water at room temperature.

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Section: Figurementioning

confidence: 99%

Ultrathin Ni(0)‐Embedded Ni(OH)₂ Heterostructured Nanosheets with Enhanced Electrochemical Overall Water Splitting

et al. 2020

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“…Earth‐abundant 3d transition metal‐based catalysts exhibit unique d electron configurations and have recently being recognized as promising alternatives. A variety of transition metal‐based catalysts have been developed for high‐efficient hydrogen production …”

Section: Introductionmentioning

confidence: 99%

In Situ Growth of Ag Nanodots Decorated Cu₂O Porous Nanobelts Networks on Copper Foam for Efficient HER Electrocatalysis

Song

Zhao

Sun

et al. 2019

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Developing earth‐abundant electrocatalysts for high‐efficiency hydrogen evolution reaction (HER) has become one of the leading research frontiers in energy conversion. Here, the design and in situ growth of Ag nanodots decorated Cu2O porous nanobelts networks on Cu foam (denoted as Ag@Cu2O/CF) are carried out via a simple one‐pot solution strategy at room temperature. Serving as self‐supporting electrocatalysts, Ag@Cu2O porous nanobelts provide plentiful active sites, and the 3D hybrid foams provide fast transportation for electrolyte and short diffusion path for newly formed H2 bubbles, which result in excellent electrocatalytic HER activity and long‐term stability. Owing to the synergistic effect between Ag nanodots and Cu2O porous nanobelts and CF, the hybrid electrocatalyst exhibits a low Tafel slope of 58 mV dec−1, a small overpotential of 108 mV at 10 mA cm−2, and high durability for more than 20 h at a potential of 200 mV for HER in 1.0 mol L−1 KOH solution.

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“…Therefore, a two-electrode configuration was constructed by using the CoPS UPNSs as both anode and cathode catalysts in 1 M KOH solution (inset of Figure 5a). The overall water splitting performance of CoPS UPNSs is comparable with the conventional noble metal catalysts such as Pt/C/NF j j RuO 2 /NF (1.55 V @ 10 mA cm À 2 ) [52] and is much better than most other reported bifunctional catalysts for water splitting (for more details, see Table S2, Supporting Information) such as Co 0.9 S 0.58 P 0.42 j j Co 0.9 S 0.58 P 0.42 (1.59 V @ 10 mA cm À 2 ), [14] CoP@NPC j j CoP@NPC (1.67 V @ 10 mA cm À 2 ), [53] NiÀ CoÀ P j j NiÀ CoÀ P (1.62 V @ 10 mA cm À 2 ), [54] and NiSe j j NiSe (1.63 V @ 10 mA cm À 2 ). The overall water splitting performance of CoPS UPNSs is comparable with the conventional noble metal catalysts such as Pt/C/NF j j RuO 2 /NF (1.55 V @ 10 mA cm À 2 ) [52] and is much better than most other reported bifunctional catalysts for water splitting (for more details, see Table S2, Supporting Information) such as Co 0.9 S 0.58 P 0.42 j j Co 0.9 S 0.58 P 0.42 (1.59 V @ 10 mA cm À 2 ), [14] CoP@NPC j j CoP@NPC (1.67 V @ 10 mA cm À 2 ), [53] NiÀ CoÀ P j j NiÀ CoÀ P (1.62 V @ 10 mA cm À 2 ), [54] and NiSe j j NiSe (1.63 V @ 10 mA cm À 2 ).…”

Section: Resultsmentioning

confidence: 99%

Engineering Ternary Pyrite‐Type CoPS Nanosheets with an Ultrathin Porous Structure for Efficient Electrocatalytic Water Splitting

Liu

Lin

et al. 2019

ChemElectroChem

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For electrochemical water splitting, the development of lowcost, efficient, and robust electrocatalysts for both the oxygen evolution reaction and hydrogen evolution reaction remains challenging. Herein, we report stoichiometric ternary-phase CoPS with a two-dimensional ultrathin porous nanosheet structure as an efficient bifunctional electrocatalyst for overall water splitting. Owing to the stable stoichiometric ternary phase, abundant octahedral Co 3 + is observed in CoPS, serving as active sites to boost electrocatalytic activities. With the introduction of the ultrathin porous nanosheet structure, more active sites are exposed to enhance the electrochemical performance. Therefore, the samples display remarkable oxygen evolution activity with a low overpotential of 316 mV at 10 mA cm À 2 and a small Tafel slope of 50.2 mV dec À 1 . Combined with their highly efficient hydrogen evolution activity, CoPS ultrathin porous nanosheets are demonstrated to have extraordinary activities for overall water splitting, with a cell voltage of 1.57 V to reach 10 mA cm À 2 current density. This work not only provides a bifunctional catalyst with outstanding performance, but also offers a facile route for improving electrocatalytic activity by synergistic morphology design and electronic modulation.

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Construction of hierarchical Ni–Co–P hollow nanobricks with oriented nanosheets for efficient overall water splitting

Abstract: Novel Ni–Co–P hollow nanobricks are constructed with oriented nanosheets and manifest as an excellent bifunctional electrocatalyst for overall water splitting.

Cited by 764 publications

References 72 publications

Ultrathin Ni(0)‐Embedded Ni(OH)₂ Heterostructured Nanosheets with Enhanced Electrochemical Overall Water Splitting

Ultrathin Ni(0)‐Embedded Ni(OH)₂ Heterostructured Nanosheets with Enhanced Electrochemical Overall Water Splitting

In Situ Growth of Ag Nanodots Decorated Cu₂O Porous Nanobelts Networks on Copper Foam for Efficient HER Electrocatalysis

Engineering Ternary Pyrite‐Type CoPS Nanosheets with an Ultrathin Porous Structure for Efficient Electrocatalytic Water Splitting

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Construction of hierarchical Ni–Co–P hollow nanobricks with oriented nanosheets for efficient overall water splitting

Abstract: Novel Ni–Co–P hollow nanobricks are constructed with oriented nanosheets and manifest as an excellent bifunctional electrocatalyst for overall water splitting.

Cited by 764 publications

References 72 publications

Ultrathin Ni(0)‐Embedded Ni(OH)2 Heterostructured Nanosheets with Enhanced Electrochemical Overall Water Splitting

Ultrathin Ni(0)‐Embedded Ni(OH)2 Heterostructured Nanosheets with Enhanced Electrochemical Overall Water Splitting

In Situ Growth of Ag Nanodots Decorated Cu2O Porous Nanobelts Networks on Copper Foam for Efficient HER Electrocatalysis

Engineering Ternary Pyrite‐Type CoPS Nanosheets with an Ultrathin Porous Structure for Efficient Electrocatalytic Water Splitting

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Product

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Ultrathin Ni(0)‐Embedded Ni(OH)₂ Heterostructured Nanosheets with Enhanced Electrochemical Overall Water Splitting

Ultrathin Ni(0)‐Embedded Ni(OH)₂ Heterostructured Nanosheets with Enhanced Electrochemical Overall Water Splitting

In Situ Growth of Ag Nanodots Decorated Cu₂O Porous Nanobelts Networks on Copper Foam for Efficient HER Electrocatalysis