Evolutionary face-to-face 2D/2D bismuth-based heterojunction: The quest for sustainable photocatalytic applications

Chong, Di Sen; Foo, Joel Jie; Tan, Xin‐Quan; Ling, Grayson Zhi Sheng; Tan, Lling‐Lling; Chen, Xingzhu; Ong, Wee‐Jun

doi:10.1016/j.apmt.2022.101636

Cited by 11 publications

(18 citation statements)

References 179 publications

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“…The photocatalytic CO 2 reduction system uses a relatively green and sustainable way to produce methanol, which results in 76.85 kg CO 2 equiv greenhouse gas emissions and 23.85 kg oil equiv fossil depletion. In this step, it alleviates the use of inorganic chemical substances such as triethanolamine and bipyridine compounds, which is usually employed as the sacrificial agents in most of the photocatalytic systems . Therefore, electricity becomes the major contributor (68.2%) to GWP, followed by heat generation (15.7%) and activated carbon production (5.5%) (Figure d).…”

Section: Resultsmentioning

confidence: 99%

“…In this step, it alleviates the use of inorganic chemical substances such as triethanolamine and bipyridine compounds, which is usually employed as the sacrificial agents in most of the photocatalytic systems. 58 Therefore, electricity becomes the major contributor (68.2%) to GWP, followed by heat generation (15.7%) and activated carbon production (5.5%) (Figure 3d). As such, for the CO 2 reduction subprocess, the FDP score of 23.85 kg oil equiv is mainly caused by the consumption of fossil fuels for electricity and heat energy generation.…”

Section: ■ Introductionmentioning

confidence: 99%

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Transition into Net-Zero Carbon Community from Fossil Fuels: Life Cycle Assessment of Light-Driven CO₂ Conversion to Methanol Using Graphitic Carbon Nitride

Ling

Foo

Tan

et al. 2023

ACS Sustainable Chem. Eng.

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Direct conversion of waste CO2 into CH3OH by solar irradiation has emerged as the most enthralling alternative to conventional steam methane reforming, which reduced the concentration of greenhouse gases and the consumption of fossil resources. A cradle-to-gate life cycle assessment was carried out to assess the environmental feasibility of implementing the current g-C3N4-based photocatalytic CO2 reduction system based on 1 kg CH3OH production. It was observed that the emerging photocatalytic CH3OH system induced 68 and 53% less carbon footprint and fossil usage, respectively, in producing the same amount of CH3OH as compared to the conventional approach. The CO2 reduction reaction step was identified as the main contributor in photocatalytic system, which accounted for more than 50% of the total environmental impact scores. In the conventional system, the score points of global warming and fossil depletion contributed the most by the product purification and desulfurization step, respectively. In addition, sensitivity analysis manifested that the lowest environmental burden of 46.50 kg of CO2 equiv carbon emission and 15.27 kg oil equiv fossil consumption was obtained in the photocatalytic CH3OH system upon replacing fossil-based energy with hydro-powered electricity. These results suggest a potent replacement of the incumbent industry system for the amelioration of climate benefits and resource conservation with the advanced development of the photocatalytic system.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Transition into Net-Zero Carbon Community from Fossil Fuels: Life Cycle Assessment of Light-Driven CO₂ Conversion to Methanol Using Graphitic Carbon Nitride

Ling

Foo

Tan

et al. 2023

ACS Sustainable Chem. Eng.

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“…Certainly, the photocatalyst is another critical factor in determining pollutant removal efficiency. [145] First, the photocatalysts absorb more irradiated light to produce electron-hole pairs. Second, the photocatalyst should be able to separate effectively and transfer the photogenerated electrons and holes, making them participate in the subsequent reaction.…”

Section: Photochemical Processmentioning

confidence: 99%

Interface Engineering in 2D/2D Heterogeneous Photocatalysts

Meng

Zhang

et al. 2022

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reduction to energy-efficient fuels, [6][7][8] N 2 fixation to ammonia, [9] ammonia treatment, [10,11] and pollutants elimination. [12][13][14][15] Generally, photocatalysis is greatly affected by the composition, crystal structure, and electronic structure of photocatalysts. [16] Recently, 2D nanostructured photocatalysts have evoked interdisciplinary research interest because of their atomiclevel thickness, large specific surface area, excellent flexibility, unique physicochemical and electronic properties.

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“…In addition, the presence of a built-in electric field in NbOXY enables the efficient spatial separation of photoexcited electron-hole pairs onto the two opposite surface [89], with electron (hole) preferentially migrates towards the surface with X (Y ) halogen atoms upon photoexcitation. Importantly, the combined factors of (i) sizable (∆E 1 , ∆E 2 ) that is beneficial for enhancing HER and OER activities; (ii) built-in electric field that is beneficial for photoexcited electron-hole pair separation; (iii) strong optical absorption covering visible and ultraviolet regimes that is beneficial for optimal coverage of solar spectrum (discussed below); and (iv) large carrier mobility reaching well over 10 4 cm 2 V −1 s −1 (discussed below), suggest the capability of NbOXY monolayers in photocatalytic water splitting applications [93,94].…”

Section: Band Alignment Interface Potential Difference and Overall Ph...mentioning

confidence: 99%

2D Janus Niobium Oxydihalide NbO$XY$: Multifunctional High-Mobility Piezoelectric Semiconductor for Electronics, Photonics and Sustainable Energy Applications

Su¹,

Lee²,

Guo³

et al. 2022

Preprint

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Two-dimensional (2D) niobium oxydihalide NbOI2 has been recently demonstrated as an excellent in-plane piezoelectric and nonlinear optical material. Here we show that Janus niobium oxydihalide, NbOXY (X, Y = Cl, Br, I and X =Y), is a multifunctional anisotropic semiconductor family with exceptional piezoelectric, electronic, photocatalytic and optical properties. NbOXY are stable and flexible monolayers with band gap around the visible light regime of ∼ 1.9 eV. The anisotropic carrier mobility of NbOXY lies in the range of 10 3 ∼ 10 4 cm 2 V −1 s −1 , which represents some of the highest among 2D semiconductors of bandgap 2 eV. Inversion symmetry breaking in Janus NbOXY generates sizable out-of-plane d31 piezoelectric response while still retaining a strong in-plane piezoelectricity. Remarkably, NbOXY exhibits an additional out-of-plane piezoelectric response, d32 as large as 0.55 pm/V. G0W0-BSE calculation further reveals the strong linear optical dichroism of NbOXY in the visible-to-ultraviolet regime. The optical absorption peaks of 14 ∼ 18 % in the deep UV regime (5 ∼ 6 eV) outperform the vast majority of other 2D materials. The high carrier mobility, strong optical absorption, sizable built-in electric field and band alignment compatible with overall water splitting further suggest the strengths of NbOXY in solar-to-hydrogen conversion. We further propose a directional stress sensing device to demonstrate how the outof-plane piezoelectricity can be harnessed for functional device applications. Our findings unveil NbOXY as an exceptional multifunctional 2D semiconductor for flexible electronics, optoelectronics, UV photonics, piezoelectronics and sustainable energy applications.

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Evolutionary face-to-face 2D/2D bismuth-based heterojunction: The quest for sustainable photocatalytic applications

Cited by 11 publications

References 179 publications

Transition into Net-Zero Carbon Community from Fossil Fuels: Life Cycle Assessment of Light-Driven CO₂ Conversion to Methanol Using Graphitic Carbon Nitride

Transition into Net-Zero Carbon Community from Fossil Fuels: Life Cycle Assessment of Light-Driven CO₂ Conversion to Methanol Using Graphitic Carbon Nitride

Interface Engineering in 2D/2D Heterogeneous Photocatalysts

2D Janus Niobium Oxydihalide NbO$XY$: Multifunctional High-Mobility Piezoelectric Semiconductor for Electronics, Photonics and Sustainable Energy Applications

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Evolutionary face-to-face 2D/2D bismuth-based heterojunction: The quest for sustainable photocatalytic applications

Cited by 11 publications

References 179 publications

Transition into Net-Zero Carbon Community from Fossil Fuels: Life Cycle Assessment of Light-Driven CO2 Conversion to Methanol Using Graphitic Carbon Nitride

Transition into Net-Zero Carbon Community from Fossil Fuels: Life Cycle Assessment of Light-Driven CO2 Conversion to Methanol Using Graphitic Carbon Nitride

Interface Engineering in 2D/2D Heterogeneous Photocatalysts

2D Janus Niobium Oxydihalide NbO$XY$: Multifunctional High-Mobility Piezoelectric Semiconductor for Electronics, Photonics and Sustainable Energy Applications

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Product

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Transition into Net-Zero Carbon Community from Fossil Fuels: Life Cycle Assessment of Light-Driven CO₂ Conversion to Methanol Using Graphitic Carbon Nitride

Transition into Net-Zero Carbon Community from Fossil Fuels: Life Cycle Assessment of Light-Driven CO₂ Conversion to Methanol Using Graphitic Carbon Nitride