Bimetallic In₂O₃/Bi₂O₃ Catalysts Enable Highly Selective CO₂ Electroreduction to Formate within Ultra‐Broad Potential Windows

Abstract

CO2 electrochemical reduction reaction (CO2RR) to formate is a hopeful pathway for reducing CO2 and producing high‐value chemicals, which needs highly selective catalysts with ultra‐broad potential windows to meet the industrial demands. Herein, the nanorod‐like bimetallic In2O3/Bi2O3 catalysts were successfully synthesized by pyrolysis of bimetallic InBi‐MOF precursors. The abundant oxygen vacancies generated from the lattice mismatch of Bi2O3 and In2O3 reduced the activation energy of CO2 to and improved the selectivity of to formate simultaneously. Meanwhile, the carbon skeleton derived from the pyrolysis of organic framework of InBi‐MOF provided a conductive network to accelerate the electrons transmission. The catalyst exhibited an ultra‐broad applied potential window of 1200 mV (from −0.4 to −1.6 V vs RHE), relativistic high Faradaic efficiency of formate (99.92%) and satisfactory stability after 30 h. The in situ FT‐IR experiment and DFT calculation verified that the abundant oxygen vacancies on the surface of catalysts can easily absorb CO2 molecules, and oxygen vacancy path is dominant pathway. This work provides a convenient method to construct high‐performance bimetallic catalysts for the industrial application of CO2RR.

Indium Metal Oxide Tandem Ag Catalyst toward Highly Selective CO2 Electroreduction to CO over a Wide Potential Window

“…Low-cost and earth-abundant post-transition-metal oxides (PTMOs, such as In 2 O 3 , SnO 2 , and Bi 2 O 3 ) have gradually attracted attention due to their high overpotential for the hydrogen evolution reaction (HER). − In general, CO 2 could be efficiently electroreduced to formate/formic acid at PTMOs in an aqueous electrolyte. ,− However, despite PTMOs exhibiting a commendable CO 2 activation capability, their binding affinity toward *CO 2 – and *CO intermediates is insufficient for efficient CO production. − Moreover, PTMOs are prone to cathode deactivation during the reaction process, , thereby impeding their application in eCO 2 RR.…”

Porous Indium Nanocrystals on Conductive Carbon Nanotube Networks for High‐Performance CO2‐to‐Formate Electrocatalytic Conversion

“…Additionally, the conductivity of electrocatalysts also affects the performance of CO 2 RR. [26][27][28] During CO 2 electroreduction, electrons are generally transferred from the catalyst or electrode interface to generate the reaction products. The electrocatalysts with better conductivity can facilitate electron transfer and promote the CO 2 RR.…”

Tandem catalysts CuSe/AuX for increasing local *CO concentration to promote the photocatalytic CO2 reduction to C2H4

“…The combustion of fossil fuels results in the annual release of significant amounts of carbon dioxide (CO 2 ) into the atmosphere, intensifying the greenhouse effect and ocean acidification 1–3 . On the other hand, CO 2 is also a bountiful carbon source widely present in the atmosphere.…”

“…The combustion of fossil fuels results in the annual release of significant amounts of carbon dioxide (CO 2 ) into the atmosphere, intensifying the greenhouse effect and ocean acidification. [1][2][3] On the other hand, CO 2 is also a bountiful carbon source widely present in the atmosphere. Using renewable clean energy, such as solar energy, to convert CO 2 into high value-added chemicals can promote the carbon cycle, which is helpful to solve the greenhouse effect and energy shortage.…”