Affiliation:
1. Department of Chemistry and Chemical Biology Rutgers The State University of New Jersey 610 Taylor Road Piscataway New Jersey 08854 USA
2. Department of Chemical and Biochemical Engineering Rutgers The State University of New Jersey 98 Brett Road Piscataway 08854 New Jersey USA
3. Hoffman Institute of Advanced Materials Shenzhen Polytechnic 7098 Liuxian Boulevard Shenzhen 518060 China
Abstract
AbstractThe development of durable and efficient electrocatalysts composed of low‐cost, earth‐abundant metals for the oxygen evolution reaction (OER) is crucial for industrial‐scale water splitting to produce green hydrogen on a large scale. Transition metal borates are considered good candidate electrocatalysts for OER due to their low cost, ease of synthesis, and good catalytic activity. In this work, we demonstrate that the incorporation of an oxophilic main group metal, bismuth (Bi), into cobalt borates produces highly effective electrocatalysts for OER. We also show that the catalytic activity of Bi‐doped cobalt borates can be improved further by pyrolyzing them in an argon atmosphere. During pyrolysis, the Bi crystallites formed in the materials melt, transform into amorphous phases, interact better with the Co or B atoms in there, and form more synergistic catalytic sites for OER. By varying the amount of Bi as well as the pyrolysis temperature, different Bi‐doped cobalt borates are synthesized, and the most optimal OER electrocatalyst is identified. Among them, the one with Co : Bi ratio of 9 : 1 and that is pyrolyzed at 450 °C exhibits the best catalytic activity, driving the reaction at a current density of 10 mA cm−2 with the lowest overpotential (318 mV) and a Tafel slope of 37 mV dec−1.
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献