Engineering a conductive network of atomically thin bismuthene with rich defects enables CO₂ reduction to formate with industry-compatible current densities and stability

Abstract

Electrochemical CO2 reduction reaction (CO2RR) to value-added and readily collectable liquid products is promising but remains a great challenge due to the lack of efficient and robust electrocatalysts. Herein, a...

CO2 Conversion at High Current Densities: Stabilization of Bi(III) Containing Electrocatalysts under CO2 Gas Flow Conditions

“…(BiO) 2 CO 3 -related features disappear completely from the diffractograms and Raman spectra of GDEs subjected to electrolysis potentials below -1.5 V vs. RHE (panels a and c of Figure 6). Our results demonstrate that the subcarbonate reaction pathway of formate formation (Figure 1), already described for liquid-flow and H-type cell test beds, 38,54,77 is also relevant for the CO 2 RR performed in gas-fed electrolyzer devices. Intriguingly, in the present case, the subcarbonate phase remains stable even at the extremely cathodic potential of -1.5 V vs. RHE (Figure 6a and c).…”

A hexacoordinated Bi3+-based ellagate MOF with acid/base resistance boosting carbon dioxide electroreduction to formate

“…[7][8][9] Signicant efforts have been devoted to exploring and designing novel electrocatalysts for producing value-added products, such as formate. 1,5,10,11 In recent years, various metal-based electrocatalysts, such as Bi, In, Sn, Pb, Pd, Cu, Hg, etc., [12][13][14][15][16][17][18][19][20][21] have been proven to be active in reducing CO 2 into formate. Notably, Bi-based catalysts have been considered suitable candidates owing to their captivating characteristics: (i) compared to the toxic metals of Pb and Hg, Bi-based electrocatalysts display lower toxicity and an environmentally benign nature; (ii) their high hydrogen evolution overpotential is benecial for promoting CO 2 reduction; (iii) Bi-based electrocatalysts exhibit strong affinity toward OCHO intermediates, giving rise to high selectivity for formate production; (iv) their low cost and good durability can facilitate their practical application.…”

Enzyme‐Inspired Microenvironment Engineering of a Single‐Molecular Heterojunction for Promoting Concerted Electrochemical CO2 Reduction

“…In particular, (NH x ) 16 ‐NiPc/CNTs achieves a remarkable CO partial current density of 305 mA cm −2 at −1.37 V, which can meet the need for industrial implementation. [ 50,51 ] Moreover, the long‐term stability is another crucial criterion to evaluate the competence of a catalyst. Correspondingly, the constant‐current electrolysis of (NH x ) 16 ‐NiPc/CNTs at the current density of 200 mA cm −2 in the flow cell was carried out and is displayed in Figure 5d, and no significant increase in potential was noticed during a 50 000 s continuous test.…”