Synthesis, electrochemical property and photocatalytic H2 evolution of a novel binuclear complex under irradiation of visible light

Zheng, Hui-Qin; Rao, Heng; Hu, Xiaozong; Li, Xiaohu; Fan, Yaoting; Hou, Hongwei

doi:10.1016/j.solener.2014.04.021

Cited by 11 publications

(10 citation statements)

References 24 publications

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“…Furthermore, a higher added H 2 of 130.1 mmol was observed after 3 h irradiation when extra [Co(dbp) 2 ]Cl 2 and EY 2À were simultaneously added to the inactivated system, indicating the synergetic effect of both catalyst and PS on H 2 generation, and also implying the photodegradation of the target complex was another factor affecting the inactivation of photocatalytic system in the photolysis process. The observations were also consistent with the earlier reports by our research group and some similar studies in the literatures [2,3,7,16]. This deduction was further demonstrated by the changes in the absorption spectra of EY 2À before and after irradiation with visible light (Fig.…”

Section: Stability Of Systemsupporting

confidence: 93%

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Photocatalytic H2 generation based on noble-metal-free Co(II) photocatalyst under visible-light-driven

Zheng

Rao

et al. 2015

Journal of the Energy Institute

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Keywords:Cobalt(II) photocatalyst Photocatalytic system based solely upon noble-metal-free system Photocatalysis H 2 generation Mechanism a b s t r a c t A noble-metal-free catalyst, namely Co(II) complex [Co(dbp) 2 ]Cl 2 (dbp ¼ 4,4 0 -dimethyl-2,2 0 -bipyridyl), had been prepared for photocatalytic H 2 generation. The H 2 generation was achieved by the constructed homogeneous photocatalytic system comprising of [Co(dbp) 2 ]Cl 2 as catalyst, Eosin Y as photosensitizer and triethanolamine as sacrifice agent under visible-light-driven (l > 420 nm). The maximum H 2 yield of 169.2 mmol appeared at target catalyst of 4.0 Â 10 À4 M, EY 2À of 4.0 Â 10 À4 M and 10% TEOA (v/v) at pH 9 in CH 3 CN/H 2 O of 1:1 (v/v), indicating that this complex could also be used as a potential photocatalytic material for H 2 evolution under the irradiation of visible light. In addition, the H 2 generation mechanism was also briefly discussed.

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Section: Stability Of Systemsupporting

confidence: 93%

“…2 and 15% (v/v), respectively. The developing trend was in agreement with that of our previous reports [2,3]. The result indicated that TEOA dosage should be controlled at a reasonable level to generate much more H 2 .…”

Section: Effect Of Sacrificial Reagent On H 2 Generationsupporting

confidence: 92%

Photocatalytic H2 generation based on noble-metal-free Co(II) photocatalyst under visible-light-driven

Zheng

Rao

et al. 2015

Journal of the Energy Institute

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“…The phenomenon could be 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 10 expected because it might cause protonation of TEOA at a lower pH level, which would lead to the partial loss of its electron donor ability. Likewise, it was not favorable for H 2 production at a higher pH level because the concentration of H + was too low [30,31].…”

Section: Effect Of Phmentioning

confidence: 99%

Synthesis, characterization of a new photosensitive compound [Ru(bpy)2 (TPAD)](PF6)2 and its application for photocatalytic hydrogen production

Zheng

Guo

Yin

et al. 2016

Chemical Physics Letters

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A new photosensitive compound based on triphenylamine donor and ruthenium(II), namely [Ru(bpy) 2 (TPAD)](PF 6 ) 2 (PS1,bpy=2,2'-bipyridine, [1,10] phenanthroline-2-yl)phenyl)-N-phenylbenzenamine), had been synthesized and characterized by elemental analysis, 1 H NMR, MS spectra, UV, PL and CV measurements . The target photocatalyst, PS1/0.5wt%Pt/TiO 2 , was prepared by sensitizing PS1 to 0.5wt%Pt/TiO 2 and characterized by SEM and XRD. The highest hydrogen evolution reached to 9500 mol·(g catalyst) -1 (475μmol,31.7 TON and TOF 5.8 vs. PS1) under the optimal conditions with 0.05 g·L -1 of PS1, and 5% of TEOA at pH 11 with the irradiation of 5.5h. The mechanism of hydrogen evolution was also briefly discussed in the present work.

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“…The electrochemical property of the complex ( 23 ) showed three irreversible redox processes that correspond to Co(III)Co(III)/Co(III)Co(II), Co(III)Co(III)/Co(II)Co(II) and Co(II)Co(II)/Co(I)Co(I). The third redox property of the complex indicated that there are two active metal sites in the complex [35] …”

Section: Electrochemistry and Electrocatalytic Activity Of Cobaloximesmentioning

confidence: 99%

“…A binuclear cobalt complex (23) of the type (Co 2 (dmgH) 4 (μ-4,4'-bpy)Cl 2 where bpy = bipyridine was synthesized by H.Q.Zheng et al, [35] and characterized by IR and 1 H-NMR spectroscopy. The IR spectra of the complex showed a peak at 3442 cm À 1 that was assigned to OÀ H stretching vibration, and the peaks at 2963, 2920, 2908 cm À 1 were assigned for -CÀ H stretching.…”

Section: Spectroscopic Characterization Of Cobaloximesmentioning

confidence: 99%

Electrochemistry and Electrocatalytic Activity of Cobaloxime Complexes

Subramanian

Vijaikanth

2022

ChemistrySelect

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Development of clean and renewable energy sources has emerged as one of the major interests due to the environmental issues caused by the fossil fuels. Presently a huge amount of interest has been devoted in developing the cost effective alternative energy sources and hydrogen gas has been considered as one of the substitutes for fossil fuels. Initially noble metals like Platinum was employed as a catalyst for hydrogen generation but they are costly. So, recently first row transition metal based catalysts have been utilized for the production of hydrogen gas since these metals are cost effective and earth copious. Among the first row transition metal catalysts, cobalt complexes in particular cobaloximes have been given importance as capable catalysts for hydrogen production. This review discusses about the recent advances in the electrochemistry and the various approaches employed towards the attachment of the cobaloxime complexes on the electrode surface and their electrocatalytic behaviour.

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Synthesis, electrochemical property and photocatalytic H2 evolution of a novel binuclear complex under irradiation of visible light

Cited by 11 publications

References 24 publications

Photocatalytic H2 generation based on noble-metal-free Co(II) photocatalyst under visible-light-driven

Photocatalytic H2 generation based on noble-metal-free Co(II) photocatalyst under visible-light-driven

Synthesis, characterization of a new photosensitive compound [Ru(bpy)2 (TPAD)](PF6)2 and its application for photocatalytic hydrogen production

Electrochemistry and Electrocatalytic Activity of Cobaloxime Complexes

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