Built-in Electric Field Promotes Interfacial Adsorption and Activation of CO₂ for C₁ Products over a Wide Potential Window

Abstract

The unsatisfactory adsorption and activation of CO 2 suppress electrochemical reduction over a wide potential window. Herein, the built-in electric field (BIEF) at the CeO 2 /In 2 O 3 n−n heterostructure realizes the C 1 (CO and HCOO − ) selectivity over 90.0% in a broad range of potentials from −0.7 to −1.1 V with a maximum value of 98.7 ± 0.3% at −0.8 V. In addition, the C 1 current density (−1.1 V) of the CeO 2 /In 2 O 3 heterostructure with a BIEF is about 2.0-and 3.2-fold that of In 2 O 3 and a physically mixed sample, respectively. The experimental and theoretical calculation results indicate that the introduction of CeO 2 triggered the charge redistribution and formed the BIEF at the interfaces, which enhanced the interfacial adsorption and activation of CO 2 at low overpotentials. Furthermore, the promoting effect was also extended to CeO 2 /In 2 S 3 . This work gives a deep understanding of BIEF engineering for highly efficient CO 2 electroreduction over a wide potential window.

Electrochemical Water Splitting by Mo-Based Metal–Organic Framework-Derived MoO2/NC/Pt Nanostructures in a Wide pH Range

“…The work collects comparative LSV curves of MoO 2 /NC/Pt-20 before and after 1000 cycles CV with no significant changes from the initial curve, as well as electrochemical change curves at 10 mA·cm –2 to investigate their long-term electrochemical conduct in all-pH and the results showed that it has a strong long-term stability (Figure j–l). Additionally, by observing the SEM images, MoO 2 /NC/Pt-20 after electrocatalytic HER still retained the rod-like morphology with a rough surface (Figure S7) and the XRD patterns after catalysis are identical to the initial, proving that the structure of the post-tested samples remained almost unchanged (Figure S8), further confirming the satisfactory stability of MoO 2 /NC/Pt-20 in all-pH ranges. The CV results suggest that the MoO 2 /NC/Pt-20 catalyst undergoes distinct redox behaviors depending on the pH environment, with comprehensive redox cycling in acid and a more selective reduction-dominated process in neutral and alkaline conditions (Figure S9).…”

Highly Reversible Zn–Air Batteries Enabled by Tuned Valence Electron and Steric Hindrance on Atomic Fe–N4–C Sites

“…The Co-based spinel oxides have attracted attention owing to their earth abundance, good catalytic activity, and stability for the OER in alkaline media. − Tunable charge separation, carrier migration, and variation of the energy band structure could be achieved. , Moreover, by utilizing the steric hindrance of Co-based spinel oxides, the electronic structure of the metal center can be effectively regulated. − Herein, Ni x Co 3– x O 4 is utilized as steric hindrance to manipulate the valence electron of the Fe center on Fe–N 4 –C sites to enhance bifunctional oxygen electrocatalysis. The OER stability is 10 times higher than that of pristine Fe 1 /NC in alkaline media.…”

Scalable synthesis of Bi2O2S nanoplates with large piezoelectric potential induced by a built-in electric field in a [Bi2O2]2+ layer for the degradation of organic contaminants

“…Then a built-in electric field (BIEF) is generated, which further induces the electrons (e − ) and holes (h + ) to separate in a crystal that is excited by external stress, and thus redox reactions occurred with the adsorbed substances on the catalyst surface to effectively degrade organic pollutants. Therefore, the design and construction of piezoelectric catalysts for the generation of BIEF is crucial, 8–10 which requires piezoelectric catalysts with asymmetric crystal structures and flexible shapes. 11–13…”