Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
p-Block Indium Single-Atom Catalyst with Low-Coordinated In-N Motif for Enhanced Electrochemical CO2 Reduction. / Li, Simin; Lu, Xiuyuan; Zhao, Siqi et al.
In: ACS Catalysis, Vol. 12, No. 12, 06.2022, p. 7386-7395.Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
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TY - JOUR
T1 - p-Block Indium Single-Atom Catalyst with Low-Coordinated In-N Motif for Enhanced Electrochemical CO2 Reduction
AU - Li, Simin
AU - Lu, Xiuyuan
AU - Zhao, Siqi
AU - Ceccato, Marcel
AU - Hu, Xin-Ming
AU - Roldan, Alberto
AU - Liu, Min
AU - Daasbjerg, Kim
PY - 2022/6
Y1 - 2022/6
N2 - Electrochemical CO2 reduction represents a promising path toward the production of value-added chemicals. Atomically dispersed metal sites on nitrogen-doped carbon have demonstrated outstanding catalytic performance in this reaction. However, challenges remain in developing such catalysts beyond transition metals. Herein, we present two types of p-block indium single-atom catalysts: one with four nitrogen coordinated (In-N-4) and another with three nitrogen coordinated with one vacancy nearby (In-N-3-V). In electrochemical CO2 reduction, the In-N-3-V site can achieve maximum CO Faradic efficiency (FECO) of 95% at -0.57 V vs reversible hydrogen electrode (RHE) in an aqueous medium. This outperforms the intact In-N-4 catalyst with the maximum FE(CO )of 80% at -0.47 V vs RHE. Density functional theory calculations on the mechanism suggest that structural change from In-N-4 to In-N-3-V brings the In orbital (s and pz) energies closer to the Fermi energy. These hybridized orbitals are responsible for lowering the energy barrier for COOH* intermediate formation, thus enhancing the catalytic performance. This work sheds light on the relationship between catalytic performance and structure of In single-atom sites, highlighting the importance of tailoring the electron state of s and P-z orbitals in developing efficient p-block single-atom catalysts for electrochemical CO2 reduction.
AB - Electrochemical CO2 reduction represents a promising path toward the production of value-added chemicals. Atomically dispersed metal sites on nitrogen-doped carbon have demonstrated outstanding catalytic performance in this reaction. However, challenges remain in developing such catalysts beyond transition metals. Herein, we present two types of p-block indium single-atom catalysts: one with four nitrogen coordinated (In-N-4) and another with three nitrogen coordinated with one vacancy nearby (In-N-3-V). In electrochemical CO2 reduction, the In-N-3-V site can achieve maximum CO Faradic efficiency (FECO) of 95% at -0.57 V vs reversible hydrogen electrode (RHE) in an aqueous medium. This outperforms the intact In-N-4 catalyst with the maximum FE(CO )of 80% at -0.47 V vs RHE. Density functional theory calculations on the mechanism suggest that structural change from In-N-4 to In-N-3-V brings the In orbital (s and pz) energies closer to the Fermi energy. These hybridized orbitals are responsible for lowering the energy barrier for COOH* intermediate formation, thus enhancing the catalytic performance. This work sheds light on the relationship between catalytic performance and structure of In single-atom sites, highlighting the importance of tailoring the electron state of s and P-z orbitals in developing efficient p-block single-atom catalysts for electrochemical CO2 reduction.
KW - CO2 reduction
KW - indium single atoms
KW - metal-organic frameworks
KW - coordination environment
KW - electrocatalysis
KW - CARBON
KW - FORMATE
KW - ELECTROREDUCTION
KW - ELECTROCATALYST
KW - CONVERSION
KW - METAL
UR - https://pubs.acs.org/doi/pdf/10.1021/acscatal.2c01805
U2 - 10.1021/acscatal.2c01805
DO - 10.1021/acscatal.2c01805
M3 - Journal article
VL - 12
SP - 7386
EP - 7395
JO - A C S Catalysis
JF - A C S Catalysis
SN - 2155-5435
IS - 12
ER -