Surface modification of hydroxyapatite for hydrogen generation

Jaworski, Justyn; Kim, Dae Hyun; Jung, Kyeongmun; Kim, Sohue; Jung, Jong Hwa; Jeong, Jong Ok; Jeon, Hyo Sang; Min, Byoung Koun; Kwon, Ki Young

doi:10.1016/j.jcis.2011.03.068

Cited by 12 publications

(4 citation statements)

References 33 publications

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“…One important surface characteristic of HAP is that various cations and anions can be incorporated on HAP surface in aqueous solution either ion exchange or sorption processes . Previously, we investigated microscopic surface properties of HAP in aqueous solution using AFM and catalytic properties of transition metal doped HAPs …”

Section: Figuresupporting

confidence: 78%

“…[25] Previously, we investigated microscopic surface properties of HAP in aqueous solution using AFM and catalytic properties of transition metal doped HAPs. [26][27][28][29] After ion exchange reaction of HAP with Co 2 + , white color of HAP is changed into the violet (Insert in Figure 1). The cobalt quantity in CoHAP analyzed by ICP-AES and EDX amounts to 0.96 wt.…”

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confidence: 99%

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Cobalt Incorporated Hydroxyapatite Catalyst for Water Oxidation

et al. 2019

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We report the novel oxygen evolution reaction (OER) catalyst based on cobalt incorporated hydroxyapatite (CoHAP). Our catalyst is prepared on the surface of hydroxyapatite by ion exchange reaction in Co2+ aqueous solution. The cobalt content is approximately 1 wt. % based on ICP‐AES and XPS experiments. XRD, TEM, EDX experiments suggest that individual cobalt ions are adsorbed on the HAP surface in non‐aggregated manner. The cyclic voltammetry (CV) of CoHAP exhibits a weak oxidation peak at 1.10 V which is comparable to CV of in‐situ formed Co−Pi in previous literature. Tafel slope is approximately 80 mV/decade which is independent on the loading amount of CoHAP. The Faradaic efficiency is 94 % measured by quantitative analysis of O2 using gas chromatography. Bulk electrolysis verifies that CoHAP can be utilized OER catalyst at neutral pH with high stability. Our preparation method using hydroxyapatite as a solid phase phosphate source offers a new strategy to fabricate the OER catalysts.

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confidence: 78%

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confidence: 99%

Cobalt Incorporated Hydroxyapatite Catalyst for Water Oxidation

et al. 2019

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“…3 More important than ever is the exploration of an effective catalytic system for on-demand hydrogen fuel generation from such chemical hydride precursors for effective use in applications including proton exchange membrane fuel cells. Among the chemical hydrides, sodium borohydride (NaBH 4 ) has been praised for its hydrogen storage density, 4 stability in air and in basic solutions, 5 and the recyclability of its sideproduct sodium metaborate (NaBO 2 ). 6 In prior works, cobalt has proven to be an effective and low-cost catalyst for the hydrolysis of stable NaBH 4 solutions into H 2 gas and NaBO 2 as an alternative to high priced noble metal based catalysts.…”

Section: Introductionmentioning

confidence: 99%

Amphiphilic coatings on cobalt boride nanocatalysts for stability in hydrogen generation applications

Kim

Jaworski

2015

Macromol. Res.

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“…22 Support structure must prevent the agglomeration of catalyst, surface oxidation of the catalyst, leaching metal catalyst, and precipitation of hydrated borates on the surface of heterogeneous catalyst. 23 Both the pore structures and hydrophilicity of supporting materials affect the performance of catalysts, and additionally, the hydrophilicity of supporting materials contributes the well-stable dispersion for a catalyst.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of graphene-based Co-B catalyst via simultaneous chemical reduction for hydrolysis of sodium borohydride

Özdemir

Haşimoğlu

Ahsen

2013

Journal of Renewable and Sustainable Energy

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Co-B nanoparticles are deposited on graphene sheets by simultaneous chemical reduction of Co þ2 and graphite oxides using NaBH 4 as the reducing agent. The reduced CoÀB/graphene nanocomposites were characterized by X-ray diffraction, Fourier transform infrared spectra, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The results show that after reduction, not only considerable amount of functional groups has been removed but also exhibited formation of Co-B alloy on the graphene sheets. The catalytic activity of nanocomposites was investigated by the hydrolysis of NaBH 4 in aqueous solution. Graphene support material greatly enhances the hydrolysis of NaBH 4 with respect to graphite and active carbon supports, and chemical reduced graphene sheets can readily form stable aqueous colloids through electrostatic stabilization. The present method is promising for the synthesis of effective supported catalysts for hydrolysis of NaBH 4 . V C 2013 AIP Publishing LLC. [http://dx.

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Surface modification of hydroxyapatite for hydrogen generation

Cited by 12 publications

References 33 publications

Cobalt Incorporated Hydroxyapatite Catalyst for Water Oxidation

Cobalt Incorporated Hydroxyapatite Catalyst for Water Oxidation

Amphiphilic coatings on cobalt boride nanocatalysts for stability in hydrogen generation applications

Synthesis of graphene-based Co-B catalyst via simultaneous chemical reduction for hydrolysis of sodium borohydride

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