Promoting Oxygen
Electrochemical Reduction to Hydrogen Peroxide through Fabricating
Hierarchical Pores
Shaojie Wang, Jiping Luo, Lele Yuan, Mengyao Chen, Wei Ma, Peiqin Sun,
Shaohui Sun*.
*Engineering Research Center of Advanced Functional Material
Manufacturing of Ministry of Education, Zhengzhou University, Zhengzhou
450001,
China.
[Abstract] In this work, we demonstrate an effective
approach to enhance the activity and selectivity of carbon materials
for
hydrogen peroxide (H2O2)production by
means of interface engineering. Carbon black and/or graphite are mixed
with polytetrafluoroethylene(PTFE)and pore-forming agent to form a gas
diffusion electrode for H2O2. Structural
characterizations find that PTFE not only acts as a
binder, it also changes the
original pore size distribution of carbon materials by increasing the
number of mesoporous and micron pores. These unique hierarchical pores
enhance an efficient gas transmission and dispersion network system.
Meanwhile, a number of polymer phases are generated in the inner of
electrode with the size of 30nm-1μm, which enhance the affinity of
catalyst surface to oxygen. Under the detachable H-type
H2O2 test device and optimized
conditions, H2O2 concentration can reach
11.8wt%. The simple physical mixing engineering fabricating
hierarchical pores would be helpful to other electrochemical processes
involving gas-solid-liquid three-phase interface.
Key Words :interface engineering, hierarchical pores, gas
diffusion electrode, 2e--ORR,
H2O2