A Strongly Coupled Graphene and FeNi Double Hydroxide Hybrid as an Excellent Electrocatalyst for the Oxygen Evolution Reaction

Long, Xia; Li, Jinkai; Xiao, Shuang; Yan, Keyou; Wang, Zilong; Chen, Haining; Yang, Shihe

doi:10.1002/anie.201402822

Cited by 756 publications

(521 citation statements)

References 32 publications

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“…As shown in Figure 7, this substrate combines several advantages: good transparency (~62% of transmittance), high diffuse reflectance (~37%), low electric resistance, (≤40 Ω/square), and easy adhesion of the photo-catalysts; in addition, this substrate allows In order for these materials to be used in a Polymeric Exchange Membrane (PEM)-type photo-electrolysis device, to make a membrane-electrode assembly (MEA), the presence of macroporosity is indispensable to allow the diffusion of the water, protons (H + ) and produced gases. For such a purpose, porous metal substrates (i.e., Ni or Ti meshes or foams) have been used as supports for water splitting photocatalysts [92]. Nevertheless, under highly oxidizing conditions, or in the presence of concentrated (acid or basic) electrolytes, they can suffer from low corrosion stability; moreover, they can have a lower surface area than the nanostructured substrates.…”

Section: Substrate Modificationmentioning

confidence: 99%

Recent Advances in the BiVO4 Photocatalyst for Sun-Driven Water Oxidation: Top-Performing Photoanodes and Scale-Up Challenges

2017

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Photoelectrochemical (PEC) water splitting, which is a type of artificial photosynthesis, is a sustainable way of converting solar energy into chemical energy. The water oxidation half-reaction has always represented the bottleneck of this process because of the thermodynamic and kinetic challenges that are involved. Several materials have been explored and studied to address the issues pertaining to solar water oxidation. Significant advances have recently been made in the use of stable and relatively cheap metal oxides, i.e., semiconducting photocatalysts. The use of BiVO 4 for this purpose can be considered advantageous because this catalyst is able to absorb a substantial portion of the solar spectrum and has favourable conduction and valence band edge positions. However, BiVO 4 is also associated with poor electron mobility and slow water oxidation kinetics and these are the problems that are currently being investigated in the ongoing research in this field. This review focuses on the most recent advances in the best-performing BiVO 4 -based photoanodes to date. It summarizes the critical parameters that contribute to the performance of these photoanodes, and highlights so far unresolved critical features related to the scale-up of a BiVO 4 -based PEC water-splitting device.

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Section: Substrate Modificationmentioning

confidence: 99%

Recent Advances in the BiVO4 Photocatalyst for Sun-Driven Water Oxidation: Top-Performing Photoanodes and Scale-Up Challenges

2017

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“…The positive peak observed at ∼0.37 V (vs Ag/AgCl) is the oxidation of catalytically active ions (Ni(II) → Ni(III/IV)) before oxygen evolution. 39 To reach the current density of 10 mA/cm 2 that represents the current density from a device with ∼10% solar to hydrogen efficiency, the overpotential needed for Ni NP/NiFe LDH is 328 mV, which is 47 and 76 mV smaller than NiFe LDH and Ni(OH) 2 , respectively (Fig. 3A), indicating Ni NP/NiFe LDH to be the best OER catalyst (Table S2).…”

Section: Fig 1 (As Well Asmentioning

confidence: 99%

Ni Nanoparticles Decorated NiFe Layered Double Hydroxide as Bifunctional Electrochemical Catalyst

Gao

Long

Han

et al. 2017

J. Electrochem. Soc.

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Reducing overpotential and increasing current density remain a great challenge for promoting the application of transition metalsbased layered double hydroxides (LDHs). Herein, Ni nanoparticles (∼10 nm) decorated NiFe LDH ultrathin (thickness: ∼2 nm) nanosheets (Ni NP/NiFe LDH) were successfully synthesized which exhibited advanced electrocatalytic activity and long-term stability on both oxygen evolution reaction (OER) and urea oxidation reaction (UOR). The onset potentials for OER and UOR are 1.50 V and 1.34 V, respectively, both are lower than NiFe LDH under the same conditions. Moreover, the peak current density of UOR was 300 mA/cm 2 , which is much larger than reported precious-metal free UOR catalysts. The excellent catalytic performance of Ni NP/NiFe LDH composite for OER and UOR is proposed to result from the abundant exposed active sites, small charge transfer resistance, and the synergistic effects between NiFe LDH and anchored Ni nanoparticles. This work provides inspiring ideas and helpful guidelines in design of low-cost but highly efficient electrochemical catalysts. The global energy crisis and environmental contamination have prompted intense research into the development of sustainable energy conversion and storage systems.1-10 Water splitting and direct urea fuel cell (DUFC) as promising approaches to produce clean energy recyclable, have been widely investigated recently. Nevertheless, oxygen evolution reaction (OER: 2H 2 O === O 2 + 4H + + 4e − ) suffers from a sluggish kinetics owing to a 4e-transfer process, which is frequently an obstacle to the whole water splitting. Same as OER, urea oxidation reaction (UOR: CO(NH 2 ) 2 + H 2 O === N 2 + 3H 2 + CO 2 ) is also under a multistep proton-coupled electron transfer process, which remains to be a great challenge for DUFC. As a consequence, the sluggish kinetics of OER and UOR lead to considerable overpotential and decrease the efficiency of energy conversion and storage. To achieve efficient energy conversion, much effort has been devoted to the research for robust yet stable electrochemical catalysts with reduced overpotentials. Precious metal based catalysts have shown significant electrocatalytic properties, 11-13 but their high cost and scarcity hamper the commercialization of the technique. Therefore, developing functional nanomaterials composed of cost-effective and abundant elements are on great demand.Owing to the unique physicochemical properties (e.g. tunable metal species/ratios, and exchangeable interlayer spacings, etc.), layered double hydroxides (LDHs) [23][24][25][26][27] and among which, NiFe LDH showed the best performance.28 Nevertheless, reducing the overpotential and increasing the current density remain under intensive pursuit for promoting the application of NiFe LDH. For example, the introduction of conductive materials (graphene, carbon nanotube, etc.) into LDH systems can improve the conductivity of the catalysts 21,22 and hence further enhance their catalytic performance. Herein, we report a bifunctional catalyst ...

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“…Various supports have been used such as glassy carbon (GC), fluorine doped tin oxide (FTO), indium doped tin oxide (ITO), Pt, Pd, carbon paper, nickel foam, and Au. [25][26][27][28][29][30][31][32] It has been widely reported that Au substrates can enhance the activity of submonolayer 5 transition metal oxide OER catalysts such as Ni, Co, Fe, and Mn oxides either by electronic structure modification of the active sites or by direct participation in the reaction. [27][28][33][34][35][36] Recently, we have also discovered that Au substrates drastically enhance the geometric activity of NiOOH-based catalysts, especially NiCeOOH synthesized by cathodic electrodeposition, which can be fabricated to a highly active and stable OER electrode.…”

mentioning

confidence: 99%

Effects of Gold Substrates on the Intrinsic and Extrinsic Activity of High-Loading Nickel-Based Oxyhydroxide Oxygen Evolution Catalysts

et al. 2017

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We systematically investigate the effects of Au substrates on the oxygen evolution activities of cathodically electrodeposited nickel oxyhydroxide (NiOOH), nickel-iron oxyhydroxide (NiFeOOH), and nickel-cerium oxyhydroxide (NiCeOOH) at varying loadings from 0 -2000 nmol of metal/cm 2 . We determine that the geometric current densities, especially at higher loadings, were greatly enhanced on Au substrates: NiCeOOH/Au reached 10 mA/cm 2 at 259 mV overpotential, and NiFeOOH/Au achieved 140 mA/cm 2 at 300 mV overpotential, which were much greater than those of the analogous catalysts on graphitic carbon (GC) substrates. By performing a loading quantification using both inductively coupled plasma optical emission spectrometry and integration of the Ni 2+/3+ redox peak, we show that the enhanced activity is predominantly caused by the stronger physical adhesion of catalysts on Au. Further characterizations using impedance spectroscopy and in situ X-ray absorption spectroscopy revealed that the catalysts on Au exhibited lower film resistances and higher number of electrochemically active metal sites. We attribute this enhanced activity to a more homogeneous electrodeposition on Au, yielding catalyst films with very high geometric current densities on flat 3 substrates. By investigating the mass and site specific activities as a function of loading, we bridge the practical geometric activity to the fundamental intrinsic activity.

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A Strongly Coupled Graphene and FeNi Double Hydroxide Hybrid as an Excellent Electrocatalyst for the Oxygen Evolution Reaction

Cited by 756 publications

References 32 publications

Recent Advances in the BiVO4 Photocatalyst for Sun-Driven Water Oxidation: Top-Performing Photoanodes and Scale-Up Challenges

Recent Advances in the BiVO4 Photocatalyst for Sun-Driven Water Oxidation: Top-Performing Photoanodes and Scale-Up Challenges

Ni Nanoparticles Decorated NiFe Layered Double Hydroxide as Bifunctional Electrochemical Catalyst

Effects of Gold Substrates on the Intrinsic and Extrinsic Activity of High-Loading Nickel-Based Oxyhydroxide Oxygen Evolution Catalysts

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