Triboelectric Plasma CO₂ Reduction Reaching a Mechanical Energy Conversion Efficiency of 2.3%

Abstract

Mechanical energy‐induced CO 2 reduction is a promising strategy for reducing greenhouse gas emissions and simultaneously harvesting mechanical energy. Unfortunately, the low energy conversion efficiency is still an open challenge. Here, multiple‐pulse, flow‐type triboelectric plasma with dual functions of harvesting mechanical energy and driving chemical reactions is introduced to efficiently reduce CO 2 . CO selectivity of 92.4% is achieved under normal temperature and pressure, and the CO and O 2 evolution rates reach 12.4 and 6.7 µmol h −1 , respectively. The maximum energy conversion efficiencies of 2.3% from mechanical to chemical energy and 31.9% from electrical to chemical energy are reached. The low average electron energy in triboelectric plasma and vibrational excitation dissociation of CO 2 with low barrier is revealed by optical emission spectra and plasma simulations, which enable the high energy conversion efficiency. The approach of triboelectric plasma reduction reported here provides a promising strategy for efficient utilization of renewable and dispersed mechanical energy.

Oxygen Vacancies Enriched Hollow Bi2MoO6 Microspheres for Efficient Photocatalytic Oxidation of Hydrocarbons

“…Electron paramagnetic resonance (EPR) spectroscopy as a valuable tool for examining the distribution of unpaired electrons was further used to confirm the presence of O V s in the Bi 2 MoO 6 sample. As shown in Figure f, there is an intense EPR signal at g = 2.003, indicating that the unpaired electrons are trapped at the O V . ,− In addition, the intensity of the EPR peak in the Bi 2 MoO 6 -C sample is much higher than that in Bi 2 MoO 6 , indicating the higher concentration of O V s in Bi 2 MoO 6 -C, which is also consistent with the results obtained from O 1s XPS spectra (Figure e). The increased surface O V s in Bi 2 MoO 6 after calcination can be attributed to the removal of adsorbed CTA + ions or ethylene glycol molecules on the surface of the Bi 2 MoO 6 sample.…”

Carbon Dioxide Sequestration by Triboelectric Charging of Tumbling Quartz Sand

“…Carbon monoxide (CO) is a commonly observed reaction intermediate in the breakdown of CO 2 by electric discharges. 18,19 Using FTIR spectroscopy, we also observed the formation and subsequent decay of carbon monoxide during tumbling (Figure 2A). The intensity of the CO signal first rises and then decays at a faster rate than that of CO 2 .…”

Contact-electro-catalytic CO2 reduction from ambient air

“…[1][2][3][4][5] However, traditional catalytic CO 2 reduction methods often require high energy consumption and expensive catalysts, which limit their practical applications. [6][7][8] Therefore, it is of great signi cance to develop e cient, economical and environmentally friendly CO 2 reduction methods. As a novel energy harvesting and conversion technology, triboelectric nanogenerators (TENGs) converts mechanical energy into electrical energy by utilizing the charge difference generated by friction, thereby providing a new way to achieve sustainable energy supply.…”