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Xiaoqian Wang

Catalysis 2019
Xiaoqian Wang, Speaker at Chemical Engineering Conferences
University of Science and Technology of China, China
Title : Atomically dispersed catalysts for energy related catalysis


This presentation includes three works on atomically dispersed catalysts for energy-related catalysts. In the first one, a series of atomically dispersed Co catalysts with different nitrogen coordination numbers are prepared and their CO2 electroreduction catalytic performance is explored. The best catalyst, atomically dispersed Co with two-coordinate nitrogen atoms, achieves both high selectivity and superior activity with 94% CO formation Faradaic efficiency and a current density of 18.1 mA cm-2 at an overpotential of 520 mV. The CO formation turnover frequency reaches a record value of 18,200 h-1, surpassing most reported metal-based catalysts under comparable conditions. Our experimental and theoretical results demonstrate that lower a coordination number facilitates activation of CO2 to the *CO2 - intermediate and hence enhances CO2 electroreduction activity. In the second one, we prepare atomically dispersed Au on carbon nitride (Au1 /C3 N4 ) and investigate its catalytic performance towards N2 electro-reduction to ammonium ions (NH4 +) in sulfuric acid aqueous solution. Au1 /C3 N4 exhibits outstanding NH4 + formation Faradaic efficiency which achieves 11.1% at -0.10 V vs. RHE (reversible hydrogen electrode), outperforming most of the reported catalysts. We then assemble a full electrolytic cell with Au1 /C3 N4 as cathode to reduce N2 into NH4 + and a platinum foil as anode to catalyze hydrogen oxidation reaction. Our experimental results demonstrate that such an electrolytic cell allows us to synthesize NH4 + directly from N2 and H2 with an energy utilization rate of 4.01 mmol kJ-1. In the third work, we investigate the performance of CH4 oxidation on atomically dispersed Ag catalyst. At a temperature of only 323 K, a methanol productivity of 0.44 mmol g-1 h-1 is achieved along with high selectivity, which allows us efficiently convert CH4 into upgraded chemicals. Our works underline the significant role of atomically dispersed catalysts in energy-related catalysis.


Xiaoqian Wang received his B.Sc. in materials physics from University of Science and Technology of China in 2016. He is now pursing his Ph.D. degree under supervision of Prof. Yuen Wu at iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China. His current research interests focus on the application of nanomaterials in energy conversion and storage.)