[논문]Fe2O3 hierarchical tubular structure decorated with cobalt phosphide (CoP) nanoparticles for efficient photoelectrochemical water splitting

Quang, Nguyen Duc; Hu, Weiguang; Chang, Hyo Sik; Van, Phuoc Cao; Viet, Duc Duong; Jeong, Jong-Ryul; Seo, Dong‑; Bum; Kim, Eui‑; Tae; Kim, Chunjoong; Kim, Dojin

doi:10.1016/j.cej.2021.129278

[해외논문] Fe2O3 hierarchical tubular structure decorated with cobalt phosphide (CoP) nanoparticles for efficient photoelectrochemical water splitting

Chemical engineering journal, v.417, 2021년, pp.129278 -

Quang, Nguyen Duc (Department of Materials Science and Engineering, Chungnam National University) , Hu, Weiguang (Graduate School of Energy Science and Technology, Chungnam National University) , Chang, Hyo Sik (Graduate School of Energy Science and Technology, Chungnam National University) , Van, Phuoc Cao (Department of Materials Science and Engineering, Chungnam National University) , Viet, Duc Duong (Department of Materials Science and Engineering, Chungnam National University) , Jeong, Jong-Ryul (Department of Materials Science and Engineering, Chungnam National University) , Seo, Dong‑Bum (Department of Materials Science and Engineering, Chungnam National University) , Kim, Eui‑Tae (Department of Materials Science and Engineering, Chungnam National University) , Kim, Chunjoong (Department of Materials Science and Engineering, Chungnam Nati) , Kim, Dojin

Abstract ▼ AI-Helper

Abstract Severe charge recombination and poor water oxidation kinetics limit the performance of hematite-based (Fe2O3) photoanodes far from their theoretical levels and restrict their applicability for photoelectrochemical (PEC) water splitting devices. In this study, a hierarchical tubular structure (HTS) CoP/SnO2:Fe2O3 with a large surface area and well-defined crystalline structures was fabricated via a facile template-engaged redox etching method. The SnO2 nano-layer served as a dopant source to improve the bulk charge carrier transport efficiency along the Fe2O3 HTS growth axis; therefore, the achieved photocurrent could be up to 2.0 mA cm−2 at 1.23VRHE (V vs. reversible hydrogen electrode). The CoP nanoparticles (NPs) were introduced as a high-speed hole collector from the light-absorber layer as well as a catalyst to enhance charge carrier injection efficiency on the photoelectrode surface. As a result, CoP/SnO2:Fe2O3 shows the highest photocurrent density of 3.50 mA cm−2 (at 1.23VRHE) with a negative shift in the onset potential of 180 mV. Highlights Fabrication of large surface area and high crystallinity CoP/SnO2:Fe2O3 HTS for PEC application. The role of SnO2 and CoP on the oxidation reaction kinetics in the photoanode system was proved. The highest photocurrent density of 3.54 mA cm−2 at 1.23 VRHE among the Fe2O3-based photoanodes. Graphical abstract [DISPLAY OMISSION]

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