Cu nanowires shelled with NiFe layered double hydroxide nanosheets as bifunctional electrocatalysts for overall water splitting

Luo, Yu; Zhou, Haiqing; Sun, Jingying; Qin, Fan; Fang, Yu; Bao, Jiming; Yu, Ying; Chen, Shuo; Ren, Zhifeng

doi:10.1039/c7ee01571b

Cited by 1,083 publications

(670 citation statements)

References 64 publications

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“…This result suggests that the NiCoFe‐NC displayed a higher active electrochemical area than the raw NiCoFe without the incorporation of the N‐doped carbon nanoplates. Such a large ECSA could facilitate the adsorption of water molecules and intimate contact with the electrolyte, exposing rich active catalytic sites for OER, which contributed to the enhanced OER activity . Meanwhile, electrochemical impedance spectroscopy (EIS) was used to analyze the reaction kinetics of the catalysts.…”

Section: Resultsmentioning

confidence: 99%

Pseudocapacitive Ni‐Co‐Fe Hydroxides/N‐Doped Carbon Nanoplates‐Based Electrocatalyst for Efficient Oxygen Evolution

Liu

et al. 2018

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The oxygen evolution reaction (OER) catalytic activity of a transition metal oxides/hydroxides based electrocatalyst is related to its pseudocapacitance at potentials lower than the OER standard potential. Thus, a well-defined pseudocapacitance could be a great supplement to boost OER. Herein, a highly pseudocapacitive Ni-Fe-Co hydroxides/N-doped carbon nanoplates (NiCoFe-NC)-based electrocatalyst is synthesized using a facile one-pot solvothermal approach. The NiCoFe-NC has a great pseudocapacitive performance with 1849 F g specific capacitance and 31.5 Wh kg energy density. This material also exhibits an excellent OER catalytic activity comparable to the benchmark RuO catalysts (an initiating overpotential of 160 mV and delivering 10 mA cm current density at 250 mV, with a Tafel slope of 31 mV dec ). The catalytic performance of the optimized NiCoFe-NC catalyst could keep 24 h. X-ray photoelectron spectroscopy, electrochemically active surface area, and other physicochemical and electrochemical analyses reveal that its great OER catalytic activity is ascribed to the Ni-Co hydroxides with modular 2-Dimensional layered structure, the synergistic interactions among the Fe(III) species and Ni, Co metal centers, and the improved hydrophily endowed by the incorporation of N-doped carbon hydrogel. This work might provide a useful and general strategy to design and synthesize high-performance metal (hydr)oxides OER electrocatalysts.

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Section: Resultsmentioning

confidence: 99%

Pseudocapacitive Ni‐Co‐Fe Hydroxides/N‐Doped Carbon Nanoplates‐Based Electrocatalyst for Efficient Oxygen Evolution

Liu

et al. 2018

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“…Earth-abundant elementbased electrocatalysts, [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] such as transition-metal oxides, carbides, sulfides, phosphides, and graphdiyne, are promising alternatives to precious electrocatalysts. RuO 2 /IrO 2 and Pt-based materials are currently considered as the state-ofthe-art electrocatalysts for OER in alkaline conditions and HER in acidic conditions, respectively.…”

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confidence: 99%

Multifunctional Single‐Crystallized Carbonate Hydroxides as Highly Efficient Electrocatalyst for Full Water splitting

Hui

Xue

Jia

et al. 2018

Advanced Energy Materials

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η) are thus needed to drive these reactions. RuO 2 /IrO 2 and Pt-based materials are currently considered as the state-ofthe-art electrocatalysts for OER in alkaline conditions and HER in acidic conditions, respectively. But their high cost and scarcity hinder their practical uses. Another important aspect, researchers expect that electrocatalysts are able to work in the same alkaline media for both OER and HER processes to achieve superior FWS performances. Earth-abundant elementbased electrocatalysts, [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] such as transition-metal oxides, carbides, sulfides, phosphides, and graphdiyne, are promising alternatives to precious electrocatalysts. However, most of them are effective for OER, but very inactive to HER in alkaline condition and vice versa. We can find that there is still a lack of low cost, high efficiency bifunctional OER/HER electrocatalysts in practical applications.Transition metal carbonate hydroxides (TMCHs) are a class of layered materials, which comprised of positive-charged cations and intercalated anions in the interlayer region. [15][16][17][18] Such structure has rich redox properties and high accessibility to electrolyte, providing a very interesting possibility in developing electrocatalysts with efficient electrocatalytic activities. However, because of its low conductivity, only very limited focus has been put on the electrocatalytic behavior of TMCHs. For example, cobalt carbonate hydroxide microspheres required 466 mV, [15] cobalt carbonate hydroxide on carbon black required 509 mV, [16] and cobalt carbonate hydroxide superstructures on carbon paper needed 240 mV [17] to deliver 10 mA cm −2 , respectively. Obviously, the electrocatalytic activities of the reported TMCHs are still far from practical applications. Making the TMCHs with excellent electrocatalytic activities and stabilities is therefore of great significance.The first-row (3d) TMs (e.g., Co and Fe) are promising candidates for precious catalysts. For TM hydroxides, the cations on the surface are considered to be the active sites during the catalytic processes. The introduction of dopants or changing of the M 2+ /M 3+ molar ratios have been reported to effectively tune the electronic structure and lead to optimal adsorption energies toward higher electrocatalytic activity. [4,19,20] Recently, Zhang et al. reported that the OH adsorption energy was either too weak on CoOOH(01-12) surface or too strong on FeOOH(010) surface. [4] After being doped with Fe, the OH adsorption energy was reduced by ≈50% compared with the unary CoOOH(01-12)The controllable synthesis of single-crystallized iron-cobalt carbonate hydroxide nanosheets array on 3D conductive Ni foam (FCCH/NF) as a monolithic oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) bifunctional electrocatalyst for full water splitting is described. The results demonstrate that the incorporation of Fe can effectively tune the morphology, composition, electronic structure, and electrochemical active surface ...

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“…An optical photograph of the alkaline water electrolyzer setup indicating the evolution of gas bubbles on the surface of the electrodes is shown in Figure S10 of the Supporting Information. [42][43][44][45][46][47] For comparison, pairs of Pt/C-Ir/C and NCNi/SWCNT-700 electrodes were loaded onto nickel foam and their LSV curves are shown in Figure S11a of the Supporting Information, suggesting the superior catalytic activity of NCNi/SWCNT-700 compared to the Pt/C-Ir/C electrolyzer. [42][43][44][45][46][47] For comparison, pairs of Pt/C-Ir/C and NCNi/SWCNT-700 electrodes were loaded onto nickel foam and their LSV curves are shown in Figure S11a of the Supporting Information, suggesting the superior catalytic activity of NCNi/SWCNT-700 compared to the Pt/C-Ir/C electrolyzer.…”

Section: Resultsmentioning

confidence: 99%

A Freestanding Single‐Wall Carbon Nanotube Film Decorated with N‐Doped Carbon‐Encapsulated Ni Nanoparticles as a Bifunctional Electrocatalyst for Overall Water Splitting

et al. 2019

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Noble‐metal free, cost‐effective, and highly stable catalysts with efficient activity for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) have attracted tremendous research interest in recent years. Here, a flexible, self‐standing hybrid film comprising a N‐doped single‐wall carbon nanotube (SWCNT) network on which are anchored Ni nanoparticles encapsulated by a monolayer of N‐doped carbon (NCNi) is reported. The films are prepared by floating catalyst chemical vapor deposition followed by NH 3 treatment. The material obtained at optimum conditions shows excellent bifunctional electrocatalytic activity in alkaline media with low overpotentials of 190 and 270 mV for HER and OER, respectively, to reach a current density of 10 mA cm −2 . A current density of 10 mA cm −2 at 1.57 V is achieved when this freestanding and binder‐free rod‐shaped NCNi/SWCNT assembly is used as cathode and anode in 1 m KOH solution for overall water splitting, presenting one of the best values reported to date.

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Cu nanowires shelled with NiFe layered double hydroxide nanosheets as bifunctional electrocatalysts for overall water splitting

Abstract: 3D core–shell nanostructures of few-layer NiFe LDH nanosheets grown on Cu nanowires are fabricated toward highly efficient overall water splitting.

Cited by 1,083 publications

References 64 publications

Pseudocapacitive Ni‐Co‐Fe Hydroxides/N‐Doped Carbon Nanoplates‐Based Electrocatalyst for Efficient Oxygen Evolution

Pseudocapacitive Ni‐Co‐Fe Hydroxides/N‐Doped Carbon Nanoplates‐Based Electrocatalyst for Efficient Oxygen Evolution

Multifunctional Single‐Crystallized Carbonate Hydroxides as Highly Efficient Electrocatalyst for Full Water splitting

A Freestanding Single‐Wall Carbon Nanotube Film Decorated with N‐Doped Carbon‐Encapsulated Ni Nanoparticles as a Bifunctional Electrocatalyst for Overall Water Splitting

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