A green route of electrochemical ammonia synthesis was realized for the first time by using doped LaFeO3 perovskite as an electrocatalyst under mild conditions. The NH3 formation rate of 13.46 μgNH3 h–1 mgcat –1 (3.52 × 10–10 mol s–1 cm–2) was achieved with the cell voltage of 2.4 V, and a faradaic efficiency of 1.99% was obtained when a cell voltage of 1.8 V was applied. The electrochemical ammonia synthesis was based on the chemisorption of N2 molecules on oxygen vacancies in perovskites and the subsequent electrochemical hydrogenation.

Supporting Information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Electroreduction of CO 2 on a polymer-modified Cu-based catalyst has shown high multi-electron reduction (> 2 e À ) selectivity, however, most of the corresponding current densities are still too small to support industrial applications. In this work, we designed a poly(ionic liquid) (PIL)-based Cu 0 -Cu I tandem catalyst for the production of C 2 + products with both high reaction rate and high selectivity. Remarkably, a high C 2 + faradaic efficiency (FE C 2þ ) of 76.1 % with a high partial current density of 304.2 mA cm À 2 is obtained. Mechanistic studies reveal the numbers and highly dispersed Cu 0 -PIL-Cu I interfaces are vital for such reactivity. Specifically, Cu nanoparticles derived Cu 0 -PIL interfaces account for high current density and a moderate C 2 + selectivity, whereas Cu I species derived PIL-Cu I interfaces exhibit high activity for CÀ C coupling with the local enriched *CO intermediate. Furthermore, the presence of the PIL layer promotes the C 2 + selectivity by lowering the barrier of CÀ C coupling.

Hydrogen fuel provided by water splitting reaction for storing intermittent renewable energy is an important topic, and electrocatalysis has been a research hot spot. Herein, we report the synthesis of an efficient bifunctional electrocatalytic electrode of nanoporous nickel−iron hydroxides coupled with a small amount of metal Ni/Fe based on stainless steel fiber felt (SSF) by a simple electrodeposition method. The prepared catalysis electrode can significantly improve the overall water splitting performance. The gaps of SSF are filled with nickel−iron hydroxide composites of which conductivity is improved by metal Ni/Fe simultaneously generated through electrodeposition. The synthesized electrode exhibits excellent electrocatalytic performance toward both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), only requiring overpotentials of 100 mV for HER and 210 mV for OER at 10 mA cm −2 in 1 M KOH. Employed as both anode and cathode for full water splitting, the obtained electrode also exhibits excellent activity, achieving an overall cell voltage of 1.80 V to attain 100 mA cm −2 . There is almost no potential drop after a long-time durability test. Electrocatalysis studies show the enhancement of water splitting activity may be caused by the synergistic action between the NiFe(OH) x nanosheets and SSF substrate, which benefits the chemisorption of oxygen and hydrogencontaining intermediates. The excellent activity and good stability would hopefully enable the prepared electrocatalyst to mitigate the main drawbacks of existing electrolysis technologies and provide possibilities of developing next-generation water splitting technologies.