Jump to main content
Jump to site search


Enhanced and Selective Photocatalytic reduction of CO2 by H2O over Strategically Doped Fe and Cr into Porous Boron Carbon Nitride

Abstract

Strategic doping of metals and non-metals into a photocatalyst can help in tuning the band gap and alignment of band structure. Surface charge and charge transfer mechanism in a photocatalyst system govern the product amount and their distribution. Herein, we used wet-impregnation method to embed Fe and Cr into in-planes of porous boron carbon nitride and tested the photoactivity by reducing CO2 gas in the presence of water at room temperature under visible-light illumination. The total consumed electron number, a measure for photoactivity, was increased by 2.14 times for Cr-doped boron carbon nitride than that of the pristine graphitic carbon nitride. Also, selectivity for CO was increased with transition metal doping. X-ray photoelectron spectroscopy revealed that Fe existed in +2 and +3 oxidation states; while, Cr was in +3 and +6 states. Notably, optical and electronic properties were altered for the transition metal doped catalysts. Several in situ measurements were performed to identify reaction intermediates and underlying mechanism. COO- and HCHO were active intermediates for CO formation. And HCO3- could be an intermediate for CH4 generation. This work elucidates the pivotal role of trapped charge carriers in enhancing charge separation efficiencies and product selectivity. The results herein clearly demonstrate a promising strategy to use strong p-d repulsion between metal and non-metal elements on a host photocatalyst to extend the visible-light absorption range and reduce the recombination events, which can enhance selectivity and yields of products.

Back to tab navigation

Supplementary files

Article information


Submitted
21 Feb 2020
Accepted
21 Mar 2020
First published
23 Mar 2020

Catal. Sci. Technol., 2020, Accepted Manuscript
Article type
Paper

Enhanced and Selective Photocatalytic reduction of CO2 by H2O over Strategically Doped Fe and Cr into Porous Boron Carbon Nitride

N. Ojha, A. Bajpai and S. Kumar, Catal. Sci. Technol., 2020, Accepted Manuscript , DOI: 10.1039/D0CY00343C

Social activity

Search articles by author

Spotlight

Advertisements