Cobalt single atom catalysts for the efficient electrosynthesis of hydrogen peroxide,Inorganic Chemistry Frontiers

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Cobalt single atom catalysts for the efficient electrosynthesis of hydrogen peroxide
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2021-4-1 , DOI: 10.1039/d1qi00158b
Hui Xu _{1,

2,

3,

4,

5} , Shengbo Zhang _{1,

2,

3,

4,

5} , Jing Geng _{1,

2,

3,

4,

5} , Guozhong Wang _{1,

2,

3,

4,

5} , Haimin Zhang _{1,

2,

3,

4,

5}

Affiliation

We report the synthesis of cobalt (Co) single atoms (SAs) anchored on N-doped graphitic carbon (Co-SAs/NC) by the pyrolysis of a mixture of cobalt chloride hexahydrate, ethylene diamine tetraacetic acid (EDTA) and polyvinylpyrrolidone (PVP). As an electrocatalyst, the Co-SAs/NC with a surface area of 165.6 m² g⁻¹ and a dominant mesoporous structure exhibited superior two-electron oxygen reduction reaction (2e⁻ ORR) activity in 0.1 M KOH electrolyte, affording a very positive onset potential of 0.84 V (vs. RHE) and a H₂O₂ selectivity of ∼76.0% at 0.5 V (vs. RHE). The long-term durability tests indicated that the Co-SAs/NC can generate 380.9 ± 14.85 μmol H₂O₂ stably after 10 h of reaction at 0.5 V (vs. RHE) in 0.1 M KOH, showing only ∼10% decay of the current and the corresponding faradaic efficiency (FE) of ∼72.1 ± 4.2%. The superior 2e⁻ ORR performance of Co-SAs/NC is ascribed to the synergetic effect of the Co–N_x active sites and nearby oxygen functional groups.

中文翻译：

钴单原子催化剂，用于高效电合成过氧化氢

我们报告了通过六水合氯化钴，乙二胺四乙酸（EDTA）和聚乙烯吡咯烷酮（PVP）混合物的热解，锚固在N掺杂石墨碳（Co-SAs / NC）上的钴（Co）单原子（SAs）的合成）。作为电催化剂，表面积为165.6 m ² g ^-1且占主导地位的中孔结构的Co-SAs / NC在0.1 M KOH电解质中表现出优异的双电子氧还原反应（2e ^- ORR）活性，具有非常强的正电性。起始电位为0.84 V（相对于RHE），在0.5 V（相对于RHE）下H ₂ O ₂选择性约为76.0％。长期耐久性测试表明，Co-SAs / NC可以产生380.9±14.85μmolH₂ O₂在0.5 V（相对于RHE）在0.1 M KOH中反应10小时后稳定，显示电流衰减仅约10％，相应的法拉第效率（FE）为约72.1±4.2％。Co-SAs / NC优异的2e^- ORR性能归因于Co-N_x活性位点和附近的氧官能团的协同作用。

更新日期：2021-04-21

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