Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (11): 20220475.doi: 10.7503/cjcu20220475

• Physical Chemistry • Previous Articles     Next Articles

Zinc-based Activated Fe/Co/N Doped Biomass Carbon Electrocatalysts with High Oxygen Reduction Activity

HE Yujing, LI Jiale, WANG Dongyang, WANG Fuling, XIAO Zuoxu, CHEN Yanli()   

  1. School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China
  • Received:2022-07-13 Online:2022-11-10 Published:2022-08-22
  • Contact: CHEN Yanli E-mail:yanlichen@upc.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21771192);the National Undergraduate Training Program for Innovation and Entrepreneurship, China(S202010425002)

Abstract:

To promote the wide application of clean energy fuel cells, there is an urgent need to develop transition metal-based high-efficiency oxygen reduction(ORR) catalytic materials with low cost and a wide source of raw materials to replace the precious metal platinum-based catalytic materials currently in use. In this paper, non-noble metal ions such as iron and cobalt metal ions were used as the main active sites of catalytic materials, and the carbon source of sodium alginate, a marine biomass material with a three-dimensional pore structure, rich in carboxyl, hydroxyl groups, and easy to form in aqueous gel networks, was preanchored in situ by metal-carboxyl/ hydroxyl chelating key, freeze-drying get aerogel. Then, through high-temperature carbonization, a highly active and stable Co/Zn/Fe/N@bio-C-2 oxygen reduction catalyst material with active sites evenly distributed in the carbon skeleton with multistage pore structure was obtained. The catalyst consists of two different iron-based active materials(Fe2O3 and Fe) and two different cobalt-based active materials(CoO and Co). At the same time, zinc nitrate was used as an activator to improve the pore structure of the catalytic materials. The total area of the carbon materials increased from 149.3 m2/g to 325.3 m2/g. A series of comparative tests revealed that the synergistic effect of the Fe/Co dual active site and a suitable specific surface area resulted in the best ORR catalytic activity of Co/Zn/Fe/N@bio-C-2. The initial potential and half-wave potential reached 0.99 and 0.87 V in 0.1 mol/L KOH, respectively. This performance has reached the excellent level reported at present. This study provides a new strategy for the preparation of high-performance ORR catalyst materials by dispersing active sites and increasing the porosity of catalytic materials.

Key words: Iron/cobalt-based electrocatalyst, Biomass carbon, Activating agent, Oxygen reduction reaction

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