Surface charge modification via protonation of graphitic carbon nitride (g-C3N4) for electrostatic self-assembly construction of 2D/2D reduced graphene oxide (rGO)/g-C3N4 nanostructures toward enhanced photocatalytic reduction of carbon dioxide to methane

Ong, Wee‐Jun; Tan, Lling‐Lling; Chai, Siang‐Piao; Yong, Siek Ting; Mohamed, Abdul Rahman

doi:10.1016/j.nanoen.2015.03.014

Cited by 753 publications

(413 citation statements)

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“…The limited availability of primary forms of energy including non-renewable fossil based energy sources such as oil and gas is increasingly forcing engineers and scientists to develop techniques to extract electric energy from renewable energy sources [1,2,3,4,5,6] . Electrochemically initiated water splitting allows the conversion of electricity into fuel-hydrogen plus oxygen, with which a fuel cell can be operated [7, 8, 9, 10, 11, 12,] .…”

Section: Introductionmentioning

confidence: 99%

Electro‐Oxidation of Ni42 Steel: A Highly Active Bifunctional Electrocatalyst

Schäfer

Chevrier

Zhang

et al. 2016

Adv Funct Materials

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Janus type Water-Splitting Catalysts have attracted highest attention as a tool of choice for solar to fuel conversion. AISI Ni 42 steel was upon harsh anodization converted in a bifunctional electrocatalyst. Oxygen evolution reaction-(OER) and hydrogen evolution reaction (HER) are highly efficiently and steadfast catalyzed at pH 7, 13, 14, 14.6 (OER) respectively at pH 0, 1, 13, 14, 14.6 (HER). The current density taken from long-term OER measurements in pH 7 buffer solution upon the electro activated steel at 491 mV overpotential (η) was around 4 times higher (4 mA/cm 2 ) in comparison with recently developed OER electrocatalysts. The very strong voltagecurrent behavior of the catalyst shown in OER polarization experiments at both pH 7 and at pH 13 were even superior to those known for IrO 2 -RuO 2 . No degradation of the catalyst was detected even when conditions close to standard industrial operations were applied to the catalyst. A stable Ni-, Fe-oxide based passivating layer sufficiently protected the bare metal for further oxidation. Quantitative charge to oxygen-(OER) and charge to hydrogen (HER) conversion was confirmed. High resolution XPS spectra showed that most likely γ−NiO(OH) and FeO(OH) are the catalytic active OER and NiO is the catalytic active HER species.

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Section: Introductionmentioning

confidence: 99%

Electro‐Oxidation of Ni42 Steel: A Highly Active Bifunctional Electrocatalyst

Schäfer

Chevrier

Zhang

et al. 2016

Adv Funct Materials

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“…It is well documented that 2D/2D nanocomposites bestow greater electron-hole mobility across the heterojunction interface, which will in turn reduce the distance and time of charge transport to impede the electron-hole recombination rate (Hou et al, 2013a;Cheng et al, 2015;Ong et al, 2015c). This is attributed to the larger 2D/2D face-to-face contact area compared with line-toface contact in 1D/2D heterojunction and point-to-face contact in 0D/2D heterojunction as depicted in Figure 2.…”

Section: Development Of 2d/2d G-c 3 N 4 -Based Heterojunctionmentioning

confidence: 97%

“…In another closely related work by the similar research group, the novel 2D/2D-reduced graphene oxide (rGO)-hybridized protonated g-C3N4 (rGO/pCN) was rationally constructed by π-π stacking and electrostatic self-assembly between the positively charged pCN and the negatively charged rGO ( Figure 5B) (Ong et al, 2015c). In the rGO/pCN hybrid nanoarchitectures, a welldispersed sheet-on-sheet structure of rGO and pCN confirmed the well-intact interfacial contact (Figures 5C,D) as compared to the rGO/g-C3N4, which employed the unmodified g-C3N4 with a negatively charged surface.…”

Section: Hybridization With 2d Graphenementioning

confidence: 99%

2D/2D Graphitic Carbon Nitride (g-C3N4) Heterojunction Nanocomposites for Photocatalysis: Why Does Face-to-Face Interface Matter?

Ong

2017

Front. Mater.

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211

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In recent years, two-dimensional (2D) graphitic carbon nitride (g-C3N4) has elicited interdisciplinary research fascination among the scientific communities due to its attractive properties such as appropriate band structures, visible-light absorption, and high chemical and thermal stability. At present, research aiming at engineering 2D g-C3N4 photocatalysts at an atomic and molecular level in conquering the global energy demand and environmental pollution has been thriving. In this review, the cutting-edge research progress on the 2D/2D g-C3N4-based hybrid nanoarchitectures will be systematically highlighted with a specific emphasis on a multitude of photocatalytic applications, not only in waste degradation for pollution alleviation, but also in renewable energy production [e.g., water splitting and carbon dioxide (CO2) reduction]. By reviewing the substantial developments on this hot research platform, it is envisioned that the review will shed light and pave a new prospect for constructing high photocatalytic performance of 2D/2D g-C3N4-based system, which could also be extended to other related energy fields, namely solar cells, supercapacitors, and electrocatalysis.

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“…Still, the high excess of RGO (>15%) occupied the active catalytic centers at pCN and thus the effective absorption of visible light and the number of photogenerated electrons from pCN to RGO, were reduced. The reaction mechanism involved the transportation of the photogenerated electrons from the VB of pCN to the CB and then to the Fermi level of RGO for the reduction of CO 2 to CO 2 -* as shown in Figure 19 [166]. For the first time, it was demonstrated by W.Yu and T.Peng et.al that g-C 3 N 4 /ZnO composites reduced CO 2 to CH 3 OH (0.6 μmol CH 3 OH/g * h) via a direct Z-shceme mechanism (and not the conventional charge separation mechanism) favored by the intimate interfacial contact between the g-C 3 N 4 and ZnO phases [167].…”

Section: Composite Photocatalysts Based On Graphene (Gr)mentioning

confidence: 99%