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Metal oxides heterojunction derived Bi-In hybrid electrocatalyst for robust electroreduction of CO_(2) to formate

能源化学:英文版 2023年第8期83卷 180-188,I0007页

作者： Runze Ye Jiaye Zhu Yun Tong Dongmei Feng Pengzuo Chen School of Chemistry and Chemical Engineering Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina

Electrochemical reduction of Bi-based metal oxides is regarded as an effective strategy to rationally design advanced electrocatalysts for electrochemical CO_(2)reduction reaction(CO_(2)RR).Realizing high selectivity at high current density is important for formate production,but remains ***,the BiIn hybrid electrocatalyst,deriving from the Bi2O3/In2O3heterojunction(MOD-Biln),shows excellent catalytic performance for CO_(2)*** Faradaic efficiency of formate(FEHCOO-) can be realized over 90% at a wide potential window from-0.4 to-1.4 V ***,while the partial current density of formate(jHCOO-) reaches about 136.7 mA cm^(-2)at-1.4 V in flow cell without *** additio n,the MOD-Biln exhibits superior stability with high selectivity of formate at 100 mA cm^(-2).Systematic characterizations prove the optimized catalytic sites and interface charge transfer of MOD-Biln,while theoretical calculation confirms that the hybrid structure with dual Bi/In metal sites contribute to the optimal free energy of*H and*OCHO intermediates on MOD-Biln surface,thus accelerating the formation and desorption step of*HCOOH to final formate *** work provides a facile and useful strategy to develop highly-active and stable electrocatalysts for CO_(2)RR.

关键词： Metal oxide derivation Hybrid electrocatalyst Dual metal sites Electrocatalytic CO_(2)RR formate product

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Electrodeposited highly-oriented bismuth microparticles for efficient CO_(2)electroreduction into formate

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Nano Research 2022年第12期15卷 10078-10083页

作者： Chen Lin Yan Liu Xiangdong Kong Zhigang Geng Jie Zeng University of Science and Technology of China Hefei230026China

Bi is one of the most fascinating catalysts for the formation of HCOO-towards CO_(2)***,we developed electrodeposited angular-shaped Bi microparticles(Bi MP)with exposed surfaces of{003}and{101}planes as efficient catalyst for the electroreduction of CO_(2)into HCOO-.During CO_(2)electroreduction,Bi MP achieved a Faraday efficiency(FE)for HCOO-of higher than 95%over a wide range of applied potential from-0.6 to-1.1 V versus reversible hydrogen electrode(***),whereas the FE for HCOO-of Bi nanoflakes(Bi NF)with exposed surfaces of{104}and{110}planes was around 70%.At-1.1 V ***,the partial current density for HCOO-of Bi MP was-271.7 mA·cm-2,1.56 times as high as that of Bi *** to kinetic analysis and mechanistic study,highly-oriented surface of Bi MP not only facilitated Faradaic process and accelerated reaction kinetics via enhancing the CO_(2)activation,but also restrained competing hydrogen evolution reaction,thus boosting catalytic performance of the electroreduction of CO_(2)into HCOO-.

关键词： electrodeposited Bi formate product highly-oriented bismuth surface CO_(2)electroreduction

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