Ionic liquid modifying conductivity and hydrophobicity of B4C for enhanced electrosynthesis of H2O2

被引：0

作者：

Fang, Wenjuan ^{[1
]}

Cui, Xuejiao ^{[1
]}

Wang, Yabing ^{[1
]}

Li, Yuanan ^{[1
]}

Xu, Na ^{[1
]}

Zhang, Shijie ^{[1
]}

Zhong, Haochong ^{[1
]}

Bao, Zhikang ^{[2
]}

Wang, Jianguo ^{[1
]}

机构：

[1] Zhejiang Univ Technol, Inst Ind Catalysis, Coll Chem Engn, State Key Lab Breeding Base Green Chem Synth Techn, Hangzhou 310032, Peoples R China

[2] Quzhou Univ, Coll Chem & Mat Engn, Quzhou 324000, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2024年 / 502卷

基金：

中国国家自然科学基金;

关键词：

Ionic liquid; B4C; Conductivity; Hydrophobicity; Hydrogen peroxide; OXYGEN REDUCTION REACTION; HYDROGEN-PEROXIDE; PERFORMANCE; ELECTROCATALYSTS; CATALYSTS;

D O I：

10.1016/j.cej.2024.157961

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Electrosynthesis of hydrogen peroxide (H2O2) via two-electron oxygen reduction reaction (2e(-) ORR) is an attractive energy-efficient and decentralized alternative to the conventional anthraquinone process. However, designing non-precious metal catalysts with high activity, selectivity and stability is a great challenge. Here, we report a facile and effective approach to improve the catalytic performance of commercial boron carbide (B4C) by loading ionic liquid (IL), which exploits the complementary properties of high electrical conductivity and hydrophobicity of IL. The B4C catalyst with optimal IL loading possesses the highest conductivity and O-2 adsorption, exhibiting high H2O2 selectivity in both neutral (similar to 96 %) and alkaline (similar to 93 %) electrolyte, which are nearly similar to 34 % and similar to 19 % higher than pristine B4C, respectively. Moreover, its production rate is similar to 1.5 times that of pristine B4C at 130 mA cm(-2) current density, resulting in a high concentration of H2O2 (5.93 wt%) produced in flow-cell reactor. The long-term cycle test demonstrates the desirable stability of IL@B4C/GDE, which is attributed to the high hydrophobicity and tight bonding between IL@B4C and the substrate, giving a strong flood-proof capability at the three-phase interface and avoiding rapid flooding by the electrolyte. This work provides new insights into designing non-precious metal electrocatalysts for efficient electrosynthesis of H2O2, emphasizing the role of IL in interface engineering.

引用

页数：9

共 52 条

[21] Multi-walled carbon nanotubes-ionic liquid-carbon paste electrode as a super selectivity sensor: Application to potentiometric monitoring of mercury ion(II) [J].