tech details

High Efficiency Electrocatalytic Conversion of CO2 to CO

Opportunity

Research is in progress on the development of ligand-protected gold (Au25) cluster nanocatalysts for the electrocatalytic conversion of carbon dioxide (CO2) to carbon monoxide (CO). A few patent pending technologies are available for licensing and/or further collaborative research from the U.S. Department of Energy’s National Energy Technology Laboratory.


Overview

Managing CO2 emissions is a major technical challenge associated with the use of fossil fuels. Catalytic conversion of CO2 into valuable chemicals, such as methane, methanol, and CO, can be employed to help offset carbon capture costs while reducing greenhouse gas emissions. These chemicals may be used directly or subjected to further chemical processing.  NETL has developed two patent-pending technologies for high efficiency electrocatalytic conversion of CO2 to CO.

The first invention is an apparatus and method to produce a nanocatalyst composed of ligand-protected Au25 clusters. The second invention describes a method for the control and isolation of differentially charged Au25 nanocatalyst clusters. This second method uses photoexcitation of the Au25 cluster in the presence of oxygen and a counter ion to specifically control the charge state of the catalyst. The method also describes the incorporation of nanocatalysts onto a support structure for charge-dependent reactivity. 

Both these technologies provide charge specific Au25 clusters that have been demonstrated to convert CO2 to CO with 99 plus percent electron (Faradaic) efficiency and at catalytic rates that are approximately 10 to 100 times greater than other state-of-the-art electrocatalytic technologies. Charge-state dependent reactivity has also been shown to enhance the reduction of O2 and the oxidation of CO. 

Overall, these technologies provide a way of creating catalysts with precisely controlled charges and tunable catalytic activity. Improved catalytic rates, electron (Faradaic) efficiencies, and product selectivities directly address core technical issues that have prevented the development of effective and scalable electrocatalytic technologies for CO2 utilization.


Significance

  • Provides superior catalytic efficiency for the conversion of CO2 to CO
  • Lower overpotential bias results in improved energy efficiency
  • Allows for precise control of nanocatalytic charge state
  • Allows for isolation of different catalyst charge states
  • Use of selective charge states results in improved catalytic activity


Applications

  • Any application where the catalytic conversion of CO2 to CO is desired
  • Oxidation of CO from feedstock streams
  • Reduction of O2 in fuel cell systems


Related Patents

U.S. Patent Number 9,139,920, issued September 22, 2015, titled "Efficient electrocatalytic conversion of CO2 to CO using ligand-protected Au25 clusters""

Inventors: Christopher Matranga, Douglas Kauffman, Dominic Alfonso, Huifeng Qian, Rongchao Jin

U.S. Non-Provisional Patent Application number 14/573,080 filed December 17, 2014, titled "Controlling Au25 Charge State for Improved Catalytic Activity."

Inventors: Douglas Kauffman, Chenjie Zeng, Christopher Matranga, Dominic Alfonso, Paul Ohodnicki, Rajan Siva, Rongchao Jin, and Xingyi Deng


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