Enhancing bioelectricity generation of bio-electrochemical reactors using porous nickel-based composite as effective oxygen reduction catalyst

JOURNAL OF CLEANER PRODUCTION

卷:277

Article

Li, Meng¹  Li, Yan-Wen¹  Yu, Xiao-Long²  Xiang, Lei¹  Zhao, Hai-Ming¹  Yan, Jian-Fang¹  Feng, Nai-Xian¹  Xu, Ming-Yi³  Cai, Quan-Ying¹  Mo, Ce-Hui¹ 

[1] Jinan Univ, Coll Life Sci & Technol, Guangdong Prov Res Ctr Environm Pollut Control &, Guangzhou 510632, Peoples R China

[2] Guangdong Univ Petrochem Technol, Sch Environm Sci & Engn, Guangdong Prov Key Lab Petrochem Pollut Proc & Co, Maoming 525000, Guangdong, Peoples R China

[3] Tech Univ Denmark, Dept Environm Engn, Bldg 113, DK-2800 Lyngby, Denmark

关键词: Nickel-based composites;    Microbial fuel cells;    Oxygen reduction performance;    Stability;   

DOI  :  10.1016/j.jclepro.2020.124137

来源: Elsevier

【 摘 要 】

Microbial fuel cell as a sustainable microbial-electrochemical reactor can harvest bio-power from wastewater by the oxidation of electro-active bacteria on the anode, while its power output is greatly relying on the oxygen reduction reaction performance of the cathode electro-catalysts. Here, the dahlia flower-like nickel-based composites have been synthesized through a hydrothermal reaction, and was used as an efficient oxygen reduction reaction catalyst in a single chamber microbial fuel cell. The physical characterization of surface structure suggests the composites have successfully prepared. The MFC with Ni-melamine cathode can achieve obviously higher power density of 378.08 mW m(-2) than those of Ni-urea cathode (244.02 mW m(-2)) and Ni-dicyandiamide cathode (201.67 mW m(-2)). A series of electrochemical characterization suggests that Ni-melamine electrode possesses larger electrochemical active surface area, lower charge transfer resistance, and higher oxygen reduction performance than those of Ni-urea electrode and Ni-dicyandiamide electrode. The electrochemical measurements have also demonstrated that nickel-melamine composites can be involved in oxygen reduction reaction via a four-electron route due to the high-efficient electrocatalytic activity. In addition, the maximum power density of nickel-based composites is obviously increased with an increase of catalysts coating amounts. When the loading amounts are 4 mg cm(-2), the power density for nickel-based composites is improved to 1421.4 mW m(-2), which is 1.68 times higher than that of Pt/C due to the introduction of oxygen vacancies and nitrogen element. Thus, nickel-based composite is an effective and promising catalyst material for microbial fuel cell to substitute Pt/C for oxygen reduction reaction application. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free