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Live microalgal cells modified by L-cys/Au@carbon dots/bilirubin oxidase layers for enhanced oxygen reduction in a membrane-less biofuel cell

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SmartMat 2022年第2期3卷 298-310页

作者： Sili Qing Lin-Lin Wang Li-Ping Jiang Xiaoge Wu Jun-Jie Zhu State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjingChina Environment Science and Engineering College Yangzhou UniversityYangzhouChina

Electrochemical oxygen reduced reaction(ORR)is a critical element in clean energy *** efforts to enhance gas transfer to the reaction interface,the low solubility of O_(2)molecules and slow diffusion rate in liquid electrolyte is still a significant ***,we design an artificial outer membrane on microalgal cells,which consists of a carbon dots/bilirubin oxidase(CDs/BOD)ORR catalyst layer and a L-cystine/Au nanoporous O_(2)supply layer.O_(2)generated by photosynthesis from microalgal cells then can be directly transported to the CDs/BOD catalytic interfaces,overcoming the sluggish gas transfer in the ***,the cathode constructed by the fabricated microalgal cells realizes an ORR current density of 655.2μA/cm^(2) with fast ORR kinetics,which is 2.68 times higher than that of a BOD cathode fed with pure O_(2).A membrane-less glucose/O_(2)biofuel cell is further developed using the hybrid artificial cells as the cathode,and the power density is 2.39 times higher than that of a BOD cathode biofuel cell in O_(2)saturated *** biomimetic design supplies O_(2)directly to the carbon dots/BOD catalyst layer from the microalgae membrane through a nanoporous L-cys/Au layer,providing an alternative solution for the transfer barrier of O_(2)in the electrolyte.

关键词： biofuel cells carbon dots microalgal cells O_(2)supply in situ

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Hydrogenase as the basis for green hydrogen production and utilization

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Journal of Energy Chemistry 2023年第10期85卷 348-362,I0011页

作者： Haishuo Ji Lei Wan Yanxin Gao Ping Du Wenjin Li Hang Luo Jiarui Ning Yingying Zhao Huangwei Wang Lixin Zhang Liyun Zhang State Key Laboratory of Medicinal Chemical Biology College of PharmacyNankai UniversityTianjin 300350China Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34-3645470 Mülheim an der RuhrGermany State Key Laboratory of Medicinal Chemical Biology College of Life SciencesNankai UniversityTianjin 300350China State Key Laboratory of Bioreactor Engineering and School of BiotechnologyEast China University of Science and Technology(ECUST)Shanghai 200237China

Hydrogenase is a paradigm of highly efficient biocatalyst for H_(2) production and utilization evolved in nature. A dilemma is that despite the high activity and efficiency expected for hydrogenases as promising catalysts for the hydrogen economy, the poor oxygen tolerance and low yield of hydrogenases largely hinder their practical application. In these years, the enigmas surrounding hydrogenases regarding their structures, oxygen tolerance, mechanisms for catalysis, redox intermediates, and proton-coupled electron transfer schemes have been gradually elucidated;the schemes, which can well couple hydrogenases with other highly efficient(in)organic and biological catalysts to build novel reactors and drive valuable reactions, make it possible for hydrogenases to find their niches. To see how scientists put efforts to tackle this issue and design novel reactors in the fields where hydrogenases play crucial roles, in this review,recent advances were summarized, including different strategies for protecting enzyme molecules from oxygen, enzyme-based assembling systems for H_(2) evolution in the photoelectronic catalysis, enzymatic biofuel cells for H_(2) utilization and storage and the efficient electricity-hydrogen-carbohydrate cycle for high-purity hydrogen and biofuel automobiles. Limitations and future perspectives of hydrogenasebased applications in H_(2) production and utilization with great impact are discussed. In addition, this review also provides a new perspective on the use of biohydrogen in healthcare beyond energy.

关键词： Hydrogenase Biological H_(2)energy Oxygen tolerance Artificial photosynthesis biofuel cells

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Screen-Printable Functional Nanomaterials for Flexible and Wearable Single-Enzyme-Based Energy-Harvesting and Self-Powered Biosensing Devices

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Nano-Micro Letters 2023年第6期15卷 254-269页

作者： Kornautchaya Veenuttranon Kanyawee Kaewpradub Itthipon Jeerapan Center of Excellence for Trace Analysis and Biosensor Prince of Songkla UniversityHat YaiSongkhla 90110Thailand Division of Physical Science Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90110Thailand Center of Excellence for Innovation in Chemistry Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90110Thailand

Developing flexible bioelectronics is essential to the realization of artificial intelligence devices and biomedical applications, such as wearables, but their potential is limited by sustainable energy supply. An enzymatic biofuel cell(BFC) is promising for power supply, but its use is limited by the challenges of incorporating multiple enzymes and rigid platforms. This paper shows the first example of screen-printable nanocomposite inks engineered for a single-enzyme-based energy-harvesting device and a self-powered biosensor driven by glucose on bioanode and biocathode. The anode ink is modified with naphthoquinone and multiwalled carbon nanotubes(MWCNTs), whereas the cathode ink is modified with Prussian blue/MWCNT hybrid before immobilizing with glucose oxidase. The flexible bioanode and the biocathode consume glucose. This BFC yields an open circuit voltage of 0.45 V and a maximum power density of 266 μW cm-2. The wearable device coupled with a wireless portable system can convert chemical energy into electric energy and detect glucose in artificial sweat. The self-powered sensor can detect glucose concentrations up to 10 mM. Common interfering substances,including lactate, uric acid, ascorbic acid, and creatinine, have no effect on this self-powered biosensor. Additionally, the device can endure multiple mechanical deformations. New advances in ink development and flexible platforms enable a wide range of applications, including on-body electronics, self-sustainable applications, and smart fabrics.

关键词： Screen-printable nanocomposites Glucose Glucose oxidase biofuel cells Self-powered biosensors Flexible bioelectronics

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