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Wang Y, Xia S, Cai R, Zhang J, Yu C, Cui J, Zhang Y, Wu J, Wu Y. Dynamic Reconstruction of Two-Dimensional Defective Bi Nanosheets for Efficient Electrocatalytic Urea Synthesis. Angew Chem Int Ed Engl 2024; 63:e202318589. [PMID: 38385612 DOI: 10.1002/anie.202318589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 02/01/2024] [Accepted: 02/20/2024] [Indexed: 02/23/2024]
Abstract
Catalyst surface dynamics drive the generation of active species for electrocatalytic reactions. Yet, the understanding of dominant site formation and reaction mechanisms is limited. In this study, we thoroughly investigate the dynamic reconstruction of two-dimensional defective Bi nanosheets from exfoliated Bi2Se3 nanosheets under electrochemical CO2 and nitrate (NO3 -) reduction conditions. The ultrathin Bi2Se3 nanosheets obtained by NaBH4-assisted cryo-mediated liquid-phase exfoliation are more easily reduced and reconstructed to Bi nanosheets with high-density grain boundaries (GBs; GB-rich Bi). The reconstructed GB-rich Bi catalyst affords a remarkable yield rate of 4.6 mmol h-1 mgcat. -1 and Faradaic efficiency of 32 % for urea production at -0.40 V vs. RHE. Notably, this yield rate is 2 and 8.2 times higher than those of the low-GB Bi and bulk Bi catalysts, respectively. Theoretical analysis demonstrates that the GB sites significantly reduce the *CO and *NH2 intermediate formation energy and C-N coupling energy barrier, enabling selective urea electrosynthesis on the GB-rich Bi catalyst. This work will trigger further research into the structure-activity interplay in dynamic processes using in situ techniques.
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Affiliation(s)
- Yan Wang
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
- Institute of Energy, Hefei Comprehensive National Science Center, Anhui Energy Laboratory), Hefei, 230009, China
| | - Shuai Xia
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Rui Cai
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Jianfang Zhang
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Cuiping Yu
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Jiewu Cui
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Yong Zhang
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Jingjie Wu
- Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH-45221, United States
| | - Yucheng Wu
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
- China International S&T Cooperation Base for Advanced Energy and Environmental Materials & Anhui Provincial International S&T Cooperation Base for Advanced Energy Materials, Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Hefei University of Technology, Hefei, 230009, China
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Xu A, Chen X, Wei D, Chu B, Yu M, Yin X, Xu J. Regulating the Electronic Structure of Bismuth Nanosheets by Titanium Doping to Boost CO 2 Electroreduction and Zn-CO 2 Batteries. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2302253. [PMID: 37211692 DOI: 10.1002/smll.202302253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Revised: 05/12/2023] [Indexed: 05/23/2023]
Abstract
The electrochemical carbon dioxide reduction reaction (E-CO2 RR) to formate is a promising strategy for mitigating greenhouse gas emissions and addressing the global energy crisis. Developing low-cost and environmentally friendly electrocatalysts with high selectivity and industrial current densities for formate production is an ideal but challenging goal in the field of electrocatalysis. Herein, novel titanium-doped bismuth nanosheets (TiBi NSs) with enhanced E-CO2 RR performance are synthesized through one-step electrochemical reduction of bismuth titanate (Bi4 Ti3 O12 ). We comprehensively evaluated TiBi NSs using in situ Raman spectra, finite element method, and density functional theory. The results indicate that the ultrathin nanosheet structure of TiBi NSs can accelerate mass transfer, while the electron-rich properties can accelerate the production of *CO2 - and enhance the adsorption strength of *OCHO intermediate. The TiBi NSs deliver a high formate Faradaic efficiency (FEformate ) of 96.3% and a formate production rate of 4032 µmol h-1 cm-2 at -1.01 V versus RHE. An ultra-high current density of -338.3 mA cm-2 is achieved at -1.25 versus RHE, and simultaneously FEformate still reaches more than 90%. Furthermore, the rechargeable Zn-CO2 battery using TiBi NSs as a cathode catalyst achieves a maximum power density of 1.05 mW cm-2 and excellent charging/discharging stability of 27 h.
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Affiliation(s)
- Aihao Xu
- School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, 530004, China
| | - Xiangyu Chen
- School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, 530004, China
| | - Dong Wei
- School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, 530004, China
| | - Bingxian Chu
- School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, 530004, China
| | - Meihua Yu
- School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, 530004, China
| | - Xucai Yin
- School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, 530004, China
| | - Jing Xu
- School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, 530004, China
- School of Chemical Engineering, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China
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