Ultrathin CuNi Nanosheets for CO₂ Reduction and O₂ Reduction Reaction in Fuel Cells

Abstract

Developing efficient electrocatalysts applicable to CO2 reduction reaction and fuel cells has drawn great attention for energy conservation and environmental protection. Molecular conversion of CO2 to valuable products and fuel cells functioning with ultrahigh energy efficiencies is critical to remediate the global warming and energy crisis. Here, ultrathin hexagonal CuNi nanosheets are demonstrated to drive CO2 reduction to C ≥ 2 products with a high Faradaic efficiency (80.5%) at −1.5 V vs RHE. Modulation of the d-band states, intermediate binding energy, and interatomic synergistic interaction between Ni and Cu are crucial for the enhancement of catalytic activity through intermediate binding control and boosting of charge transfer kinetics. In addition, a four-electron oxygen reduction reaction (ORR) process is validated for the ultrahigh performance in steady-state hydrogen–air fuel cells.

Bi2O3/BiO2 Nanoheterojunction for Highly Efficient Electrocatalytic CO2 Reduction to Formate

“…Electrochemical reduction of CO 2 into value-added hydrocarbon chemicals and fuels offers a promising avenue toward a carbon-neutral goal. − Of the prevalent CO 2 reduction products, formic acid is the most economically viable product that can challenge conventional production routes. − Recently, various alternative metal catalysts with d 10 electronic configuration have been proved to be electroactive for selectively converting CO 2 into formate. − Among all the catalysts explored to date, low-toxic and earth-abundant Bi-based materials are regarded as excellent candidates for formate electroproduction. , While for most Bi-based catalysts, the catalytical efficiency and selectivity are still insufficient to meet industrial ECO 2 RR demand. In this scenario, substantial research attempts for advanced Bi-based catalysts crafting are urgently needed. , …”

H2S Involved Photocatalytic System: A Novel Syngas Production Strategy by Boosting the Photoreduction of CO2 While Recovering Hydrogen from the Environmental Toxicant

“…The corresponding Cu 2p spectra in Figure S6b, Supporting Information, confirm the existence of Cu 2+ , in which the peaks at 934.1 and 933.9 eV are ascribed to Cu 2p 3/2 in TiO 2 :Cu and CTC‐2, respectively. [ 53,54 ] In addition, the detailed information of Cd, Ti, S, O can be obtained from the high‐resolution XPS spectra in Figure 4. It is obvious that the two spin‐split doublets located at 404.4 and 411.2 eV belonged to Cd 3d 5/2 and Cd 3d 3/2 of Cd 2+ in pristine CdS, respectively (see in Figure 4a).…”

Insights into the pH-dependent Behavior of N-Doped Carbons for the Oxygen Reduction Reaction by First-Principles Calculations

“…In addition, Pt-based catalysts also suffer from problems such as time-dependent drift, CO deactivation, and so forth, , which cannot be fully addressed in the near future. Significant efforts have been carried out to search for alternative materials to replace Pt. − Nitrogen (N)-doped carbons have been demonstrated to be one of the most promising materials because of their low cost, high abundance, and strong resistance to the poisoning of CO. ,, …”