Wastewater treatment in microbial fuel cells – an overview

Bioelectrochemical metal recovery from wastewater: a review.

Metals removal and recovery in bioelectrochemical systems: A review.

Microbial fuel cells (MFC) have recently received increasing attention due to their promising potential in sustainable wastewater treatment and contaminant removal. In general, contaminants can be removed either as an electron donor via microbial catalyzed oxidization at the anode or removed at the cathode as electron acceptors through reduction. Some contaminants can also function as electron mediators at the anode or cathode. While previous studies have done a thorough assessment of electron donors, cathodic electron acceptors and mediators have not been as well described. Oxygen is widely used as an electron acceptor due to its high oxidation potential and ready availability. Recent studies, however, have begun to assess the use of different electron acceptors because of the (1) diversity of redox potential, (2) needs of alternative and more efficient cathode reaction, and (3) expanding of MFC based technologies in different areas. The aim of this review was to evaluate the performance and applicability of various electron acceptors and mediators used in MFCs. This review also evaluated the corresponding performance, advantages and disadvantages, and future potential applications of select electron acceptors (e.g., nitrate, iron, copper, perchlorate) and mediators.

/pdf/an-overview-of-electron-acceptors-in-microbial-fuel-cells-4bogpid7ka.pdf

An overview of electron acceptors in microbial fuel cells

Bioelectrochemical system platform for sustainable environmental remediation and energy generation.

Removal of copper from aqueous solution by electrodeposition in cathode chamber of microbial fuel cell

A membrane-free baffled microbial fuel cell for cathodic reduction of Cu(II) with electricity generation.

The performance of reversible protonic ceramic electrochemical cells (R-PCECs) was significantly limited, due to lack of suitable air electrode materials specifically designed to match proton conducting electrolyte. Here, we report by doping a small amount of magnesium (5 %), a phase-pure triple conducting Ba(Co0.4Fe0.4Zr0.1Y0.1)0.95Mg0.05O3-δ (BCFZYM) perovskite is developed as an air electrode for R-PCECs. The doping of 5 % Mg effectively enhances oxygen/steam surface exchange, oxygen-ion and proton conductivity, consequently significantly improves catalytic oxygen reduction and evolution reactions (ORR/OER) activities over protonic electrolytes. R-PCECs with the BCFZYM display excellent performances in both fuel cell (850 mW cm-2 at 600 °C) and electrolysis modes (−1244 mA cm-2 at 1.3 V at 600 °C). In addition, the R-PCECs show favorable stability in cycling (110 h), electrolysis (200 h) and fuel cell modes (300 h), demonstrating that BCFZYM air electrode has excellent operating stability. 

Magnesium tuned triple conductivity and bifunctionality of BaCo0.4Fe0.4Zr0.1Y0.1O3-δ perovskite towards reversible protonic ceramic electrochemical cells

Anode-supported protonic ceramic fuel cells (PCFCs) are highly promising and efficient energy conversion systems. However, several challenges need to be overcome before these systems are used more widely, including the poor sintering of recently developed proton-conducting oxides and the decreased proton conductivity due to detrimental reactions between the nickel from anode and the electrolyte occurring during high-temperature co-sintering. Herein, a Ni doping strategy to increase the electrolyte sintering, suppress the detrimental phase reactions, and generate stable Ni nanoparticles for enhanced performance is proposed. A nickel-doped perovskite oxide is developed with the nominal composition of Ba(Zr0.1 Ce0.7 Y0.1 Yb0.1 )0.95 Ni0.05 O3- δ . Acting as a sintering aid, such a small amount of nickel effectively improves the sintering of the electrolyte. Concomitantly, reactions between nickel and the Ni-doped ceramic phase are suppressed, turning detrimental phase reactions into benefits. The nickel doping further promotes the formation of Ni nanoparticles, which enhance the electrocatalytic activity of the anode toward the hydrogen oxidation reaction and improve the charge transfer across the anode-electrolyte interface. As a result, highly efficient PCFCs are developed. The innovative anode developed in this work also shows favorable activity toward ammonia decomposition, making it highly promising for use in direct ammonia fuel cells.

Realizing Simultaneous Detrimental Reactions Suppression and Multiple Benefits Generation from Nickel Doping toward Improved Protonic Ceramic Fuel Cell Performance.

High-temperature water oxidation activity of a perovskite-based nanocomposite towards application as air electrode in reversible protonic ceramic cells

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