TY - JOUR
T1 - Auto-programmed synthesis of metallic aerogels
T2 - Core-shell Cu@Fe@Ni aerogels for efficient oxygen evolution reaction
AU - Jiang, Bo
AU - Wan, Zhe
AU - Kang, Yunqing
AU - Guo, Yanna
AU - Henzie, Joel
AU - Na, Jongbeom
AU - Li, Hexing
AU - Wang, Shengyao
AU - Bando, Yoshio
AU - Sakka, Yoshio
AU - Yamauchi, Yusuke
N1 - Funding Information:
This work was supported by the Japan Society for the Promotion of Science (JSPS). This work was also performed in part at the Queensland node of the Australian National Fabrication Facility (ANFF-Q), a company established under the National Collaborative Research Infrastructure Strategy to provide nano and microfabrication facilities for Australian researchers.
Funding Information:
This work was supported by the Japan Society for the Promotion of Science (JSPS). This work was also performed in part at the Queensland node of the Australian National Fabrication Facility (ANFF-Q), a company established under the National Collaborative Research Infrastructure Strategy to provide nano and microfabrication facilities for Australian researchers.
Publisher Copyright:
© 2020
PY - 2021/3
Y1 - 2021/3
N2 - Porous metallic aerogels are a new class of cutting-edge materials useful in catalysis because they combine high conductivity with low density and high surface area. However, the exploration of transition metal-based aerogels with core-shell architectures remains a fundamental challenge. Here, we report a one-step auto-programmed synthesis method to generate a core-shell Cu@Fe@Ni metallic aerogel. Electroactivating (EA) the core-shell Cu@Fe@Ni causes the Fe inner shell to migrate into the Ni outer shell and forms a highly-active catalytic hydroxide on the surface of the aerogel. The resulting EA-Cu@Fe@Ni catalysts exhibited a low OER overpotential of 240 mV at 10 mA cm-2, which is much smaller than bimetallic CuNi (320 mV), CuFe (390 mV), and RuO2 (271 mV). In-situ Raman measurements confirm that the catalyst's outer layer is composed of NiOOH doped with Fe during the electrochemical activation process, resulting in the high OER performance. This work describes the first example of a trimetallic core-shell aerogel synthesized in one step and enables another strategy for designing highly active metals/metal oxide electrocatalysts via surface reconstruction.
AB - Porous metallic aerogels are a new class of cutting-edge materials useful in catalysis because they combine high conductivity with low density and high surface area. However, the exploration of transition metal-based aerogels with core-shell architectures remains a fundamental challenge. Here, we report a one-step auto-programmed synthesis method to generate a core-shell Cu@Fe@Ni metallic aerogel. Electroactivating (EA) the core-shell Cu@Fe@Ni causes the Fe inner shell to migrate into the Ni outer shell and forms a highly-active catalytic hydroxide on the surface of the aerogel. The resulting EA-Cu@Fe@Ni catalysts exhibited a low OER overpotential of 240 mV at 10 mA cm-2, which is much smaller than bimetallic CuNi (320 mV), CuFe (390 mV), and RuO2 (271 mV). In-situ Raman measurements confirm that the catalyst's outer layer is composed of NiOOH doped with Fe during the electrochemical activation process, resulting in the high OER performance. This work describes the first example of a trimetallic core-shell aerogel synthesized in one step and enables another strategy for designing highly active metals/metal oxide electrocatalysts via surface reconstruction.
KW - Core-shell aerogels
KW - In-situ oxidation
KW - Oxygen evolution reaction
KW - Porous structure
KW - Transition metal-based electrocatalyst
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U2 - 10.1016/j.nanoen.2020.105644
DO - 10.1016/j.nanoen.2020.105644
M3 - Article
AN - SCOPUS:85097884527
SN - 2211-2855
VL - 81
JO - Nano Energy
JF - Nano Energy
M1 - 105644
ER -
