首页|Atomically Adjustable Rhodium Catalyst Synthesis with Outstanding Mass Activity via Surface-Li mi ted Cation Exchange

Atomically Adjustable Rhodium Catalyst Synthesis with Outstanding Mass Activity via Surface-Li mi ted Cation Exchange

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Rh has been widely studied as a catalyst for the promising hydrazine oxidation reaction that can replace oxygen evolution reactions for boosting hydrogen production from hydrazine-containing wastewater.Despite Rh being expensive,only a few studies have examined its electrocatalytic mass activity.Herein,surface-limited cation exchange and electrochemical activation processes are designed to remarkably enhance the mass activity of Rh.Rh atoms were readily replaced at the Ni sites on the surface of NiOOH electrodes by cation exchange,and the resulting RhOOH compounds were activated by the electrochemical reduction process.The cation exchange-derived Rh catalysts exhibited particle sizes not exceeding 2 nm without agglomeration,indicating a decrease in the number of inactive inner Rh atoms.Consequently,an improved mass activity of 30 A mgRh-1 was achieved at 0.4 V versus reversible hydrogen electrode.Furthermore,the two-electrode system employing the same CE-derived Rh electrodes achieved overall hydrazine splitting over 36 h at a stable low voltage.The proposed surface-limited CE process is an effective method for reducing inactive atoms of expensive noble metal catalysts.

cation exchange synthesiselectrochemical metallizationhydrazine oxidation reactionmass activityrhodium catalyst

Hak Hyeon Lee、Dong Su Kim、Swagotom Sarker、Ji Hoon Choi、Ho Seong Lee、Hyung Koun Cho

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Department of Advanced Materials Science & Engineering,Sungkyunkwan University,2066,Seobu-ro,Jangan-gu,Suwon-si,Gyeonggi-do,Seoul 16419,Korea

Department of Advanced Materials Science & Engineering,Kyungpook National University,80,Daehak-ro,Buk-gu,Daegu 41566,Korea

Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of EducationBasic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of EducationKorea Research Fellowship Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science an

2021R1A2C30118702019R1A6A1A030332152020H1D3A1A04081323

2024

10.1002/eem2.12556

能源与环境材料(英文)

能源与环境材料(英文)

ISSN：
年,卷(期)：2024.7(2)