Boosting the Performance of the Nickel Anode in the Oxygen Evolution Reaction by Simple Electrochemical Activation

Shinagawa, Tatsuya; Ng, Marcus Tze-Kiat; Takanabe, Kazuhiro

doi:10.1002/anie.201701642

Cited by 67 publications

(61 citation statements)

References 47 publications

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“…It was reported that the NiOOH phase, with an average oxidation state of 3.6 under OER potential, can facilitate the formation of OOH* intermediates (rate-determining step in OER) and the final release of O2, which consequently enhances the catalytic activity 49,57,58. As 2DNWS displays stronger anodic peak when compared with the other architectures, it is expected to provide more active sites and exhibit higher activity towards OER catalysis.The catalytic activity of different nanosheet architectures was then systematically evaluated by linear sweep voltammetry (LSV) at 5 mV s -1 in the voltage range of 1.22-1.92 V vs. RHE.…”

mentioning

confidence: 99%

Manipulating the Architecture of Atomically Thin Transition Metal (Hydr)oxides for Enhanced Oxygen Evolution Catalysis

Dou

Zhang

et al. 2018

ACS Nano

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Graphene-like nanomaterials have received tremendous research interest due to their atomic thickness and fascinating properties. Previous studies mainly focus on the modulation of their electronic structures, which undoubtedly optimizes the electronic properties, but is not the only determinant of performance in practical applications. Herein, we propose a generalized strategy to incrementally manipulate the architectures of several atomically thin transition metal (hydr)oxides, and study their effects on catalytic water oxidation. The results demonstrate the obvious superiority of a wrinkled nanosheet architecture in both catalytic activity and durability. For instance, wrinkled Ni(OH) nanosheets display a low overpotential of 358.2 mV at 10 mA cm, a high current density of 187.2 mA cm at 500 mV, a small Tafel slope of 54.4 mV dec, and excellent long-term durability with gradually optimized performance, significantly outperforming other nanosheet architectures and previously reported catalysts. The outstanding catalytic performance is mainly attributable to the 3D porous network structure constructed by wrinkled nanosheets, which not only provides sufficient contact between electrode materials and current collector, but also offers highly accessible channels for facile electrolyte diffusion and efficient O escape. Our study provides a perspective on improving the performance of graphene-like nanomaterials in a wide range of practical applications.

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confidence: 99%

Manipulating the Architecture of Atomically Thin Transition Metal (Hydr)oxides for Enhanced Oxygen Evolution Catalysis

Dou

Zhang

et al. 2018

ACS Nano

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“…Energy‐dispersive X‐ray (EDX) elemental mappings show the homogeneous distribution of Co, Fe, and Ni in both materials (Figure S6). The X‐ray diffraction (XRD) pattern for Mat‐2 shows three peaks at 2 θ of 44.5°, 51.8°, and 76.4°, which correspond to the characteristic peaks of metallic nickel . After CV activation, characteristic peaks of (Co,Ni)OOH (JCPDS29‐0491, 2 θ =21.34°, 23.7°) were found in Mat‐2 thereby implying the existence of an intermediate phase of NiOOH in CV‐activated Mat‐2, which were not found in Mat‐1 (Figure S7).…”

Section: Figurementioning

confidence: 99%

Facile Synthesis of a Ternary Metal Hydroxide with Acid Treatment as an Effective and Durable Electrocatalyst in Water Oxidation

Xing

Zhao

et al. 2018

ChemPlusChem

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Developing low‐cost, effective, and durable oxygen‐evolution catalysts (OECs) is still a huge challenge owing to the uphill thermodynamic reaction and the involvement of a four‐electron and four‐proton kinetics process. Herein, a facilely prepared NiCoFe(OH)x/NiOOH/NF electrode affords current densities of 10 and 100 mA cm−2 at overpotentials of 223 and 254 mV, respectively, and a Tafel slope as low as 33.5 mV dec−1 in 1 m KOH, which is superior to NiCoFe(OH)x/NF electrodes electrodeposited with a traditional method. This electrode also displays surprisingly high durability at a current density of 50 mA cm−2 for over 50 hours under alkaline conditions. Component analysis and an electrochemical study revealed that the catalytic activity enhancement of this newly prepared electrode is mainly attributed to the formation of the electrically conductive NiOOH interlayer.

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“…Another interesting finding is the differences of K 2p spectra between two electrodes (Figure S25, Supporting Information). The peaks located at 292.5 and 295.3 eV in the K 2p spectra of G‐Ni 4 Fe/GF electrode are assigned to the typical K 2p 3/2 and K 2p 1/2 phases, attributed to the adsorbed residual K salts in the electrolyte . However, these two peaks in G‐Pt 4 Ni/GF electrode are shifted to higher binding energies of 1 eV, indicating the strong interactions of K + with this electrode, and probably due to that K + ions are in the form of hydrated K cations during alkaline HER.…”

Section: Resultsmentioning

confidence: 92%

A Large‐Scale Graphene–Bimetal Film Electrode with an Ultrahigh Mass Catalytic Activity for Durable Water Splitting

Zhang

Yue

et al. 2018

Advanced Energy Materials

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these cases, most of the electrocatalysts are powdery, they should be pasted on conductive substrate (e.g., glassy carbon or carbon cloth electrode) with polymer binders (e.g., polytetrafluoroethylene or nafion); this would sacrifice part of ionsaccessible surface areas of catalysts and also bring additional contact resistances to the electrode. [12] Another popular case is to directly grow active species on the 3D nickel foams; the high porosity of nickel foams can provide active species with unblocked contact with electrolytes and can also efficiently release generated bubbles. [22] However, the intrinsic low conductivity and poor stability of nickel substrate induced unsatisfied durability of composite catalysts. Furthermore, these above mentioned catalysts, either powdery catalysts or nickel foam supported catalysts, often exhibit poor activities at low mass loadings, or exhibit high areal activities only at high mass loadings, thereby resulting in their poor mass activities and low utilizations of active species. The above disadvantages of existing catalysts invisibly increase the production costs of catalysts and reactions, which are far away from the requirements for industrialization. More efficient, costeffective, and durable catalysts/electrodes are urgently needed to promote the practical industrialization of water splitting. Herein, we introduce a versatile solution-processing method to fabricate large-scale, flexible, and conductive films directly as catalytic electrodes for water splitting. This film electrode takes bimetal components as active species, greatly improved the specific activities of prominent catalysts. It also takes graphene sheets as metal carriers and film-forming agent, facilitating the fast charge transfers and sufficient utilization of metal surfaces. The obtained graphene-bimetal film has excellent comprehensive performances with high areal activity even at a low mass loading of 0.05 mg cm −2 , and a record-high mass activity for water splitting with respect to reported works. The assembled two-electrode configuration delivers a cell voltage of 1.58 V at 10 mA cm −2 , as well as a long-term stability over 200 h; these performances are much superior to those of commercial Pt/C||IrO 2 coupled with the same mass loading and also surpass most of reported systems for the same purpose. Furthermore, this system also worked well at large sizes, and its performance can be further increased via raising the bath temperatures. Given the above superiorities, this graphene-bimetal film can be taken as a practical example to propel the industrialization of water splitting.The practical industralization of water splitting needs high-efficient and costeffective catalytic electrodes. A versatile and scalable solution-processing method to prepare such a catalytic electrode with high flexibility and conductivity is introduced. This preparation method is applicable for a wide variety of metal species and takes graphene sheets as metal carriers and filmforming agents, resulting in 100% utilization of...

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Boosting the Performance of the Nickel Anode in the Oxygen Evolution Reaction by Simple Electrochemical Activation

Cited by 67 publications

References 47 publications

Manipulating the Architecture of Atomically Thin Transition Metal (Hydr)oxides for Enhanced Oxygen Evolution Catalysis

Manipulating the Architecture of Atomically Thin Transition Metal (Hydr)oxides for Enhanced Oxygen Evolution Catalysis

Facile Synthesis of a Ternary Metal Hydroxide with Acid Treatment as an Effective and Durable Electrocatalyst in Water Oxidation

A Large‐Scale Graphene–Bimetal Film Electrode with an Ultrahigh Mass Catalytic Activity for Durable Water Splitting

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