Graphene/MoS2/FeCoNi(OH)x and Graphene/MoS2/FeCoNiPx multilayer-stacked vertical nanosheets on carbon fibers for highly efficient overall water splitting

Xixi Ji, Yanhong Lin, Jie Zeng, Zhonghua Ren, Zijia Lin, Yongbiao Mu, Yejun Qiu () and Jie Yu ()
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Xixi Ji: Harbin Institute of Technology, Shenzhen, University Town
Yanhong Lin: Harbin Institute of Technology, Shenzhen, University Town
Jie Zeng: Harbin Institute of Technology, Shenzhen, University Town
Zhonghua Ren: Harbin Institute of Technology, Shenzhen, University Town
Zijia Lin: Harbin Institute of Technology, Shenzhen, University Town
Yongbiao Mu: Harbin Institute of Technology, Shenzhen, University Town
Yejun Qiu: Harbin Institute of Technology, Shenzhen, University Town
Jie Yu: Harbin Institute of Technology, Shenzhen, University Town

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: Abstract Development of excellent and cheap electrocatalysts for water electrolysis is of great significance for application of hydrogen energy. Here, we show a highly efficient and stable oxygen evolution reaction (OER) catalyst with multilayer-stacked hybrid structure, in which vertical graphene nanosheets (VGSs), MoS2 nanosheets, and layered FeCoNi hydroxides (FeCoNi(OH)x) are successively grown on carbon fibers (CF/VGSs/MoS2/FeCoNi(OH)x). The catalyst exhibits excellent OER performance with a low overpotential of 225 and 241 mV to attain 500 and 1000 mA cm−2 and small Tafel slope of 29.2 mV dec−1. Theoretical calculation indicates that compositing of FeCoNi(OH)x with MoS2 could generate favorable electronic structure and decrease the OER overpotential, promoting the electrocatalytic activity. An alkaline water electrolyzer is established using CF/VGSs/MoS2/FeCoNi(OH)x anode for overall water splitting, which generates a current density of 100 mA cm−2 at 1.59 V with excellent stability over 100 h. Our highly efficient catalysts have great prospect for water electrolysis.

Date: 2021
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DOI: 10.1038/s41467-021-21742-y

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