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Transition metal ions regulated oxygen evolution reaction performance of Ni-based hydroxides hierarchical nanoarrays.

ABSTRACT: Nickel-based hydroxide hierarchical nanoarrays (Ni_yM(OH)_x HNAs M?=?Fe or Zn) are doped with non-noble transition metals to create nanostructures and regulate their activities for the oxygen evolution reaction. Catalytic performance in these materials depends on their chemical composition and the presence of nanostructures. These novel hierarchical nanostructures contain small secondary nanosheets that are grown on the primary nanowire arrays, providing a higher surface area and more efficient mass transport for electrochemical reactions. The activities of the Ni_yM(OH)_x HNAs for the oxygen evolution reaction (OER) followed the order of Ni_2.2Fe(OH)_x?>?Ni(OH)₂?>?Ni_2.1Zn(OH)_x, and these trends are supported by density functional theory (DFT) calculations. The Fe-doped nickel hydroxide hierarchical nanoarrays (Ni_2.2Fe(OH)_x HNAs), which had an appropriate elemental composition and hierarchical nanostructures, achieve the lowest onset overpotential of 234?mV and the smallest Tafel slope of 64.3?mV dec^-1. The specific activity, which is normalized to the Brunauer-Emmett-Teller (BET) surface area of the catalyst, of the Ni_2.2Fe(OH)_x HNAs is 1.15?mA?cm^-2_BET at an overpotential of 350?mV. This is ~4-times higher than that of Ni(OH)₂. These values are also superior to those of a commercial IrO_x electrocatalyst.

SUBMITTER: Zhou T

PROVIDER: S-EPMC5382681 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature

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Transition metal ions regulated oxygen evolution reaction performance of Ni-based hydroxides hierarchical nanoarrays.

Zhou Tingting T Cao Zhen Z Zhang Pan P Ma Houyi H Gao Zhen Z Wang Heng H Lu Yue Y He Jia J Zhao Yunfeng Y

Scientific reports 20170406

Nickel-based hydroxide hierarchical nanoarrays (Ni<sub>y</sub>M(OH)<sub>x</sub> HNAs M = Fe or Zn) are doped with non-noble transition metals to create nanostructures and regulate their activities for the oxygen evolution reaction. Catalytic performance in these materials depends on their chemical composition and the presence of nanostructures. These novel hierarchical nanostructures contain small secondary nanosheets that are grown on the primary nanowire arrays, providing a higher surface area ...[more]

PMID: 28383065

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Project description:Polypyrrole (PPy) nanoparticles (NPs) possess high near-infrared absorption and good biosafety, showing the potentials as photothermal therapeutic materials. However, the single function and the weak diagnostic function limit the further combination with other functional units to achieve theranostics. In this work, polyaminopyrrole (PPy-NH2) is demonstrated as the alternative of PPy for preparing NPs. Because of the amino group, metal ions, such as Cu(II) and Fe(III) can be loaded in PPy-NH2 NPs, which extends the applications in multimodal theranostics. Systematical studies reveal that the contribution of Cu(II) in multimodal theranostics is greater than Fe(III). Cu can enhance T1 response signal for magnetic resonance imaging (MRI) and be released controllably in the organism, leading to the effect of chemotherapy. Therefore, Cu(II) and Fe(III) co-loaded PPy-NH2 NPs are defined as CuPPy-NH2 NPs. Experimental results indicate that the optimal size of CuPPy-NH2 NPs is 50.2 nm. The photothermal transduction efficiency is 76.4%. After thermochemotherapy, a complete ablation of human oral epithelial carcinoma tumors is observed. No tumor recurrence is found. Methods: Cu(II) and Fe(III) co-loaded PPy-NH2 NPs are prepared through oxidation polymerization by mixing Py-NH2, CuCl2, and FeCl3 in water under stirring at room temperature, which are defined as CuPPy-NH2 NPs. The as-prepared CuPPy-NH2 NPs are tested with a variety of cell and animal experiments for tumor theranostics. Results: CuPPy-NH2 NPs have good light stability, photothermal stability, biosafety and low toxicity. The optimal size of theranostic CuPPy-NH2 NPs is 50.2 nm, which present a photothermal transduction efficiency of 76.4%. The doped Cu(II) ions also show chemotherapeutic behavior. After thermochemotherapy, a complete ablation of human oral epithelial carcinoma tumors is observed. No tumor recurrence is found. Because of the unpaired electron in Cu atomic orbits, CuPPy-NH2 NPs also show T1-weighted magnetic resonance imaging. Conclusions: This kind of transition metal-doped polymer gives a competitive approach for designing and fabricating multimodal theranostic nanodevices, which shows the potential in tumor treatment.

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Transition metal ions regulated oxygen evolution reaction performance of Ni-based hydroxides hierarchical nanoarrays.

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Transition metal ions regulated oxygen evolution reaction performance of Ni-based hydroxides hierarchical nanoarrays.

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