Bi-component Cu2O–CuCl composites with tunable oxygen vacancies and enhanced photocatalytic properties

Yang, Renchun; Lu, Xia; Huang, Xiang; Chen, Zhiming; Zhang, Xu; Xu, Maodong; Song, Qingwu; Zhu, Ling

doi:10.1016/j.apcatb.2015.01.046

Cited by 85 publications

(38 citation statements)

References 49 publications

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“…Compared to CoMoO 4 , the P-CoMoO 4-x -3 exhibits a much higher EPR signal at g = 2.005 ( Fig. 2g), corresponding to the unpaired electrons trapped at the site of oxygen vacancies, which is consistent with previous report [22]. The selected area electron diffraction (SAED) pattern of the P-CoMoO 4-x -3 nanosheet reveals a polycrystalline feature and diffraction rings that correspond to the (400), (310), and (002) planes (Fig.…”

Section: Resultssupporting

confidence: 92%

Phosphorous-containing oxygen-deficient cobalt molybdate as an advanced electrode material for supercapacitors

Liu

Yin

et al. 2019

Energy Storage Materials

150

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The intrinsically poor electrical conductivity and insufficient number of electrochemically active sites of transition-metal oxides hamper their wide application in high-performance supercapacitors. Herein, we demonstrate an effective strategy of creating phosphorus-containing cobalt molybdate (CoMoO 4) with oxygen vacancies (P-CoMoO 4-x) on nickel foam for use as a supercapacitor electrode. Experimental We have demonstrated a facile strategy for creating O vacancies and incorporating P atoms in P-CoMoO 4-x nanosheets on conductive Ni foam. Experimental and theoretical studies provide insight into the effect of the introduction of P and of O vacancies on structural and electrical properties of P-CoMoO 4-x. Moreover, P incorporation into the P-CoMoO 4-x lattice induces reduction in bond energy of CoO and the formation of Mo species with a lower oxidation state, resulting in substantially enhanced redox reaction kinetics and electrochemical performance. 4 Accordingly, the optimized P-CoMoO 4-x achieves a high specific capacity of 1368 C g −1 at a current density of 2 A g −1 , and excellent electrochemical stability. The asymmetric supercapacitor P-CoMoO 4-x //AC delivers superior energy densities of 58 W h kg −1 at a power density of 850 W kg −1 .

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Section: Resultssupporting

confidence: 92%

Phosphorous-containing oxygen-deficient cobalt molybdate as an advanced electrode material for supercapacitors

Liu

Yin

et al. 2019

Energy Storage Materials

150

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“…which can only absorb light wavelength less than 498 nm. In recent reports, numerous investigations have been enhanced photocatalysis efficiency by introduced surface oxygen vacancies in several semiconductors, such as, BiPO 4 49, CeO 2 50 and Bi-component Cu 2 O-CuCl51, which could be demonstrated to be conductive to band gap narrowing and photoactivity. Compared to the surface oxygen vacancies, the introduction of surface sulfur vacancies by doping N in our research narrows band gap and many shallow surface sulfur vacancies appear at the valance band (VB), as well as, N doping could introduce an impurity band.…”

Section: Resultsmentioning

confidence: 99%

Efficient visible light-induced degradation of rhodamine B by W(NxS1−x)2 nanoflowers

Liu

Zhang

Gao

et al. 2017

Sci Rep

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Here, W(NxS1−x)2 nanoflowers were fabricated by simple sintering process. Photocatalytic activity results indicated our fabricated N-doped WS2 nanoflowers shown outstanding photoactivity of degradating of rhodamine B with visible light. Which is attributed to the high separation efficiency of photoinduced electron–hole pairs, the broadening of the valence band (VB), and the narrowing of energy band gap. Meanwhile, our work provided a novel method to induce surface sulfur vacancies in crystals by introduing impurities atoms for enhancing their photodegradation.

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“…CuCl has cubic morphology with 1 to 2 μ along with few 400-nm-sized particles. Yang et al 33 have also reported uniform cubic shape microcrystals in SEM image of CuCl.…”

Section: Particle Sizementioning

confidence: 92%

Investigations on the hydrolysis step of copper‐chlorine thermochemical cycle for hydrogen production

et al. 2019

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Summary Detailed investigations of CuCl2 hydrolysis step of Cu–Cl thermochemical cycle were carried out on various aspects: (a) characterization and thermal properties of reactants/products using X‐ray diffraction (XRD), thermogravimetry–mass spectrometry (TG‐MS), scanning electron microscopy (SEM), temperature‐programmed desorption (TPD), and extended X‐ray absorption fine structure (EXAFS); (b) performance evaluation of fixed bed hydrolysis; (c) parametric optimization with respect to S/Cu, flow rate (gas hourly space velocity, GHSV), reaction duration, temperature, and particle size; and (d) monitored hydrolysis using isothermal TG experiments at 360°C, 370°C, 380°C, 390°C, and 400°C to derive kinetic parameters rate constant (k) and activation energy (Ea) on the basis of the shrinking‐core model. 97% conversion to Cu2OCl2 at 17 630 h−1 of GHSV, 400°C was achieved using ball‐milled CuCl2 (BM6), as compared with that of 55% over commercial un–ball‐milled reactant, CuCl2 (UBM). Correspondingly, higher k value of 2.84 h−1 over BM6 as compared with 0.97 h−1 over UBM reactant at 400°C was achieved. Ea for hydrolysis of BM6 was 93 kJ/mol, while it was 106 kJ/mol for UBM as derived from the Arrhenius plot. A probable pathway for CuCl2 hydrolysis is proposed here. It was found to be diffusion controlled, and the particle size of reactant molecules affects the packing and diffusion length. Based on our investigations, it is very unlikely to get >99% phase pure product (Cu2OCl2). Cu2OCl2 is labile in nature and tends to transform into structurally similar and stable compounds CuO and CuCl2.

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Bi-component Cu2O–CuCl composites with tunable oxygen vacancies and enhanced photocatalytic properties

Cited by 85 publications

References 49 publications

Phosphorous-containing oxygen-deficient cobalt molybdate as an advanced electrode material for supercapacitors

Phosphorous-containing oxygen-deficient cobalt molybdate as an advanced electrode material for supercapacitors

Efficient visible light-induced degradation of rhodamine B by W(NxS1−x)2 nanoflowers

Investigations on the hydrolysis step of copper‐chlorine thermochemical cycle for hydrogen production

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