In situ transformation of bismuth metal–organic frameworks for efficient selective electroreduction of CO2 to formate. Issue 46 (14th November 2020)

• Record Type: Journal Article
• Authors: Yuan, Wei-Wen; Wu, Jian-Xiang; Zhang, Xiang-Da; Hou, Shu-Zhen; Xu, Ming; Gu, Zhi-Yuan
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 46(2020)
• Page Start: 24486
• Page End: 24492
• Publication Date: 2020-11-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta08092f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : After in situ transformation from a bismuth–carboxylate MOF, MOF-derived Bi2 O2 CO3 possesses superior activity, selectivity and stability in the electroreduction of CO2 to formate. Abstract : The bismuth-based materials are proven as valid electrocatalysts for electrochemical conversion of carbon dioxide (CO2 ) into formate (HCOO − ). Herein, we discover that HCO3 − can destroy the Bi–O bonds of the bismuth–carboxylate MOF to achieve in situ transformation into Bi2 O2 CO3 (MOF-derived Bi2 O2 CO3 ), which is merely explored yet. MOF-derived Bi2 O2 CO3 shows superior electrocatalytic performance in a broad range of potentials and demonstrates a formate faradaic efficiency (FEHCOO − ) of 96.1% as well as an outstanding durability in 48 h with a current density about 10 mA cm −2 at a potential of −0.669 V vs. RHE. And compared with the structurally similar bismuth oxyhalides, MOF-derived Bi2 O2 CO3 possesses higher stability and lower CO2 concentration-dependence during CO2 reduction. Furthermore, this work puts a new strategy forward to achieve in situ MOF transformation and to comprehend the stability of electrocatalysts.