Abstract
In the electrolysis of water process, hydrogen is produced and the anodic oxygen evolution reaction (OER) dominates the reaction rate of the entire process. Currently, OER catalysts mostly consist of noble metal (NM) catalysts, which cannot be applied in industries due to the high price. It is of great importance to developing low-cost catalysts materials as NM materials substitution. In this work, jarosite (AFe3(SO4)2(OH)6, A = K+, Na+, NH4+, H3O+) was synthesized by a one-step method, and its OER catalytic performance was studied using catalytic slurry (the weight ratios of jarosite and conductive carbon black are 2:1, 1:1 and 1:2). Microstructures and functional groups of synthesized material were analyzed using XRD, SEM, FI-IR, etc. The OER catalytic performance of (NH4)Fe3(SO4)2(OH)6/conductive carbon black were examined by LSV, Tafel, EIS, ECSA, etc. The study found that the OER has the best catalytic performance when the weight ratio of (NH4)Fe3(SO4)2(OH)6 to conductive carbon black is 2:1. It requires only 376 mV overpotential to generate current densities of 10 mA cm−2 with a small Tafel slope (82.42 mV dec−1) and large Cdl value (26.17 mF cm−2).
Highlights
With the increasingly negative impact of fossil fuels on the environment, it is with a huge demand that modern science and technology need to pursue clean and sustainable energy [1,2]
The hydrogen evolution reaction (HER) reaction is a two-electron transfer process, while oxygen evolution reaction (OER) is a four-electron transfer process, whose higher energy barrier dominates the rate of the cathodic hydrogen production [5]
We explored the OER performance of these four catalysts under acidic, neutral and alkaline conditions
Summary
With the increasingly negative impact of fossil fuels on the environment, it is with a huge demand that modern science and technology need to pursue clean and sustainable energy [1,2]. Jarosite has been extensively studied by the acid leach mining industry due to the precipitation of jarosite in acidic media—a crucial step that allows for the physical separation of Fe3+ and other cations from the leach solution [19,20,21,22,23] As a result, these refining plants produce large amounts of environmentally hazardous jarosite wastes that currently provide no commercial value. When the weight ratio of (NH4)Fe3(SO4)2(OH) to conductive carbon black is 2:1, the overpotential of (NH4)Fe3(SO4)2(OH) is 376 mV at a current density of 10 mA cm−2 in alkaline conditions This performance is not comparable to that of precious metals (IrO2), there is a lot of room to improve the performance, which is our future research task. The final product was collected after filtration and washed with deionized water several times
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