Enhancement of Power Output by using Alginate Immobilized Algae in Biophotovoltaic Devices

Ng, Fong-Lee; Phang, Siew‐Moi; Periasamy, Vengadesh; Yunus, Kamran; Fisher, Adrian C.

doi:10.1038/s41598-017-16530-y

Cited by 54 publications

(55 citation statements)

References 45 publications

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“…The methods of preparing and maintaining the algal cultures were adapted from Ng et al 5 and Ng et al 7 The inoculum size used was 20%, prepared from exponential phase algal cultures that were standardized at OD 620nm = 2.0. UMACC 313 from the University of Malaya Culture Collection (UMACC).…”

Section: Algal Culturementioning

confidence: 99%

“…7 The sodium alginate solution was continuously stirred for 24 hours. Ltd.) was used to immobilize the Chlorella cells.…”

Section: Immobilization Of Algal Culturementioning

confidence: 99%

“…7 The ITO-coated glass with the algal-alginate layer was set aside for a minimum of 15 minutes to allow the algal-alginate suspension to settle on the glass surface. The supernatants were removed, and the concentrated algal cells were resuspended in BBM to prepare an algal suspension of OD 620nm = 2.0.…”

Section: Immobilization Of Algal Culturementioning

confidence: 99%

“…A BPV device contains photosynthetic microorganisms that absorb and convert solar energy into chemical energy with minimal carbon footprint. 7,11,12 Despite the various electron shuttling pathways available, Bombelli et al 3 explained that algal BPV devices without redox mediators were simpler, more efficient, and cheaper in upscaled applications. [3][4][5][6][7] Instead of releasing carbon dioxide (CO 2 ), microalgae remove CO 2 from the surroundings for biomass production.…”

Section: Introductionmentioning

confidence: 99%

“…Although most photoautotrophic organisms including microalgae will recover from minor photo-induced damages, the cessation in photosynthetic energy conversion under high irradiance will debilitate power output from algal BPV devices. 7 Since microalgae are biological cells, the immobilization material should be inert, stable, cost effective, and not interfere with cell metabolism. 9,10 The energy oxidizes water molecules into molecular oxygen, protons, and electrons in the Photosystem II (PSII) oxygen-evolving complex (OEC).…”

Section: Introductionmentioning

confidence: 99%

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Effect of different irradiance levels on bioelectricity generation from algal biophotovoltaic (BPV) devices

Thong

Phang

et al. 2019

Energy Science & Engineering

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Rapid population and economic growth in the world have accelerated the search for new sustainable and environment‐friendly energy sources. Power‐producing systems generally add to the carbon load in the environment, contributing to global climate change. In photosynthesis, energy from light splits water molecules into oxygen, protons, and electrons. Algal biophotovoltaic (BPV) platforms were developed to harvest these electrons to generate bioelectricity through algal photosynthesis. Irradiance is one of the most important parameters that determine power output efficiency from algal BPV devices. In this study, the effective range of irradiance levels for power generation from algal BPV devices comprising of suspension and alginate‐immobilized Chlorella cultures on ITO anodes was determined. Immobilized cultures were prepared by entrapping the algal cells in 2% sodium alginate solution. The algal BPV devices were illuminated by four different irradiance levels (30, 90, 150, and 210 µmol photons m−2 s−1). The maximum power density of 0.456 mW m−2 was generated from the prototype algal fuel cell at the irradiance level of 150 µmol photons m−2 s−1. At 210 µmol photons m−2 s−1, low power density was produced due to photoinhibition as indicated by Fv/Fm values generated through PAM fluorometry. In terms of carbon fixation rate, the highest value was recorded in immobilized culture at 217.11 mg CO2 L−1 d−1. The algal biophotovoltaic device is multifunctional and can provide sustainable energy with simultaneous carbon dioxide removal.

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Section: Algal Culturementioning

confidence: 99%

“…7 The sodium alginate solution was continuously stirred for 24 hours. Ltd.) was used to immobilize the Chlorella cells.…”

Section: Immobilization Of Algal Culturementioning

confidence: 99%

Section: Immobilization Of Algal Culturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of different irradiance levels on bioelectricity generation from algal biophotovoltaic (BPV) devices

Thong

Phang

et al. 2019

Energy Science & Engineering

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Conductive Polymer–Exoelectrogen Hybrid Bioelectrode with Improved Biofilm Formation and Extracellular Electron Transport

Zhang

Zhou

et al. 2019

Adv Elect Materials

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generation and wastewater treatment. [1][2][3] MFCs generate power by harvesting electrons from the exoelectrogen through oxidizing organic substrates, [4] and BPVs produce current by acquiring electrons from photosynthetic organisms through photochemical and respiratory activities. [5] Although great progresses have been achieved during recent years, low biocompatibility and organisms loading capacity at the surface of electrode and inefficient extracellular electron transport (EET), the ability of microorganisms transferring electrons to electrode, are still bottlenecks that limit the practical applications of BESs. [6][7][8] To address these issues, extensive studies have been devoted to enhance the biocompatibility of anode and improve the EET efficiency. The first strategy is to add exogenous mediators in order to increase the EET, such as riboflavin, [9] quinone, [10] neutral red, [11] and thionin. [12] But the toxicity, solubility, and requirement of continuous exogenous addition limit their application. [13,14] The second strategy is the modification of the anode with materials to provide large surface area for bacteria adhesion in the electrode interior, including inorganic nanoparticles, [15] conducting polymer nanoparticles, [16,17] and porous carbon materials. [18,19] However, the complexity and rigor of the preparation for these nanoparticles lead to poor reproducibility and the hydrophobicity of carbon materials would hinder the attachment of organisms. [20] The third way is the employment of conductive nanomaterial-coated organisms. [21,22] By coating bacteria with polypyrrole through in situ polymerization, enhanced electrical conductivity, and power output in MFC are achieved by improving the direct contact-based EET and the viability of bacteria. [23] However, the encapsulation of individual bacteria with in situ generated conductive polypyrrole needs tedious and time-consuming procedure, and the enhancement is restricted only to direct EET. Therefore, it is highly desirable to develop simple and new strategies to simultaneously satisfy the need of increased organisms loading capacity, enhanced viability of organisms on anode, and improved EET efficiency.Conductive polymers (CPs) have an electronically delocalized structure that allows electron transfer along the whole backbone. Thus, they have long been used as semiconductor and Low organism loading capacity and inefficient extracellular electron transport (EET) are still the bottlenecks hindering the development of bioelectrochemical systems (BESs). It is shown that cationic polythiophene derivative (PMNT) has the ability to simultaneously enhance bacteria biofilm formation, improve the bacteria viability, decrease the resistance value, and accelerate the EET process between exoelectrogen and the electrode. Shewanella oneidensis can form a robust and thick biofilm on the electrode surface in the presence of PMNT. Mediated by electron-transporting PMNT, even bacteria far away from the electrode can transfer electrons to it. This bioelectrode is...

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The Development of Biophotovoltaic Systems for Power Generation and Biological Analysis

et al. 2019

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Biophotovoltaic systems (BPVs) resemble microbial fuel cells, but utilise oxygenic photosynthetic microorganisms associated with an anode to generate an extracellular electrical current, which is stimulated by illumination. Study and exploitation of BPVs have come a long way over the last few decades, having benefited from several generations of electrode development and improvements in wiring schemes. Power densities of up to 0.5 W m À 2 and the powering of small electrical devices such as a digital clock have been reported. Improvements in standardisation have meant that this biophotoelectrochemical phenomenon can be further exploited to address biological questions relating to the organisms. Here, we aim to provide both biologists and electrochemists with a review of the progress of BPV development with a focus on biological materials, electrode design and interfacial wiring considerations, and propose steps for driving the field forward.[a] L.

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Enhancement of Power Output by using Alginate Immobilized Algae in Biophotovoltaic Devices

Cited by 54 publications

References 45 publications

Effect of different irradiance levels on bioelectricity generation from algal biophotovoltaic (BPV) devices

Effect of different irradiance levels on bioelectricity generation from algal biophotovoltaic (BPV) devices

Conductive Polymer–Exoelectrogen Hybrid Bioelectrode with Improved Biofilm Formation and Extracellular Electron Transport

The Development of Biophotovoltaic Systems for Power Generation and Biological Analysis

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