Bacterial nanocellulose as a green and flexible electrode matrix for efficient hydrogen evolution reaction in alkaline c
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ORIGINAL RESEARCH
Bacterial nanocellulose as a green and flexible electrode matrix for efficient hydrogen evolution reaction in alkaline conditions Amith Abraham . Vasanth Rajendiran Jothi . Jungyoup Lee . Sung-Chul Yi . Byoung-In Sang
Received: 30 January 2020 / Accepted: 26 June 2020 Ó Springer Nature B.V. 2020
Abstract Bacterial nanocellullose (BNC) is a versatile matrix for designing and incorporating threedimensional functional nanomaterials for different applications. The present study describes the fabrication of a flexible catalytic electrode for hydrogen evolution reaction using nanocellulose derived from Komagataeibacter sucrofermentans. By simple electroless deposition, the BNC is transformed into a conductive flexible substrate. On the subsequent electrodeposition process in a solution of Ni and Mo, the conductive BNC made into an active electrode for hydrogen (H2) generation. The highly nano-porous architecture and binder-free nature of the BNC
electrode enhances the surface active sites and exhibit an excellent catalytic hydrogen production in alkaline conditions. Electrochemical studies show that the NiMoO4/BNC electrode to achieve a current density of 10 mA cm-2 requires an overpotential of 109 mV with a Tafel slope of 170 mV dec-1 in 1 M KOH. Moreover, the electrode demonstrates good stability in the alkaline medium during prolonged electrolysis for 48 h. The study offers the fabrication of BNC based electrode for efficient electrocatalytic hydrogen production and promoting the usage of green materials in renewable energy technologies.
Amith Abraham and Vasanth Rajendiran Jothi have contributed equally to this work.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03327-y) contains supplementary material, which is available to authorized users. A. Abraham V. R. Jothi J. Lee S.-C. Yi (&) B.-I. Sang (&) Department of Chemical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea e-mail: [email protected] B.-I. Sang e-mail: [email protected]
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Cellulose
Graphic abstract
Keywords Bacterial nanocellulose Electrocatalyst Hydrogen evolution reaction Green electrode Komagataeibacter sucrofermentans
Introduction Hydrogen is considered the most promising fuel for replacing fossil fuels in the future due to its high energy density and eco-friendly properties. Generation of H2 through electrochemical water splitting is one of the most effective and eco-friendly approaches to obtain highly pure H2 gas (Lin et al. 2017). In power-to-gas (P2G) technology, sustainable hydrogen production can be achieved through electrolytic water splitting by electricity generated from renewable sources (Gotz et al. 2016). Even though hydrogen production through water electrolysis is a well-known technology, the cost of production becomes a significant barrier for commercialization. Platinum (Pt) is the spearheading catalyst for HER (Hydrogen evolution r
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