Reduced Graphene Oxide-Supported Cobalt Phosphide Nanoflowers via in situ Hydrothermal Synthesis as Pt-Free Effective Electrocatalysts for Oxygen Reduction Reaction

Yang Lv; Xianbao Wang; Tao Mei; Jinhua Li; Jianying Wang

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자료유형: 학술저널

저자정보: Yang Lv (Hubei University) Xianbao Wang (Hubei University) Tao Mei (Hubei University) Jinhua Li (Hubei University) Jianying Wang (Hubei University)

저널정보: 성균관대학교 성균나노과학기술원 NANO NANO Vol.13 No.5

발행연도: 2018.1

수록면: 30 - 37 (8page)

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Cobalt phosphide (CoP) has aroused extensive research interest in a field of electrochemical application due to its excellent catalytic activities. CoP and its compounds have been widely reported using in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). However, few reports about CoP as electrocatalysts for oxygen reduction reaction (ORR) were presented. In this work, we prepare reduced graphene-oxide(rGO)-loaded CoP (rGO@CoP) as an electrocatalyst for ORR through in situ hydrothermal treatment. The rGO@CoP as ORR catalyst exhibits excellent activities where its onset potential has a positive increase of 129 mV, and the ORR potential achieves an increase of 330mV at a current density of 1.0mA cm -2 compared with that of pure CoP. The current density is also significantly improved with an increase of 0.51mA cm -2 at -350 mV, and the Tafel slope has a decrease of 19mV dec -1. Further tests show that the electron transfer number of rGO@CoP is 3.66, which is larger than 2.19 of pure CoP, indicating that it is dominated by a four-electron transfer pathway. Moreover, its stability (remained 98.6% current after working 6000 s) and methanol tolerance are outstanding. These results show that rGO@CoP may be considered to replace traditional Pt-based ORR catalysts for fuel cells, and rGO loading has been proven to be an effective strategy to enhance the ORR performance of CoP, which may provide a new idea to synthesize transition metal phosphides as ORR catalysts.

참고문헌 (29)

참고문헌 신청

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M. Klingele / 2017 / Electrochem. Commun. 77:71

J. Lee / 2014 / Electrochem. Commun. 49:55

Kun Cheng / 2016 / Enhancing the Specific Activity of Metal Catalysts Toward Oxygen Reduction by Introducing Proton Conductor / NANO 11(5):48~55

L. M. Fabio / 2008 / J. Appl. Electrochem. 38:893

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