Reaction Mechanisms for the Electrochemical Reduction of CO 2 to CO and Formate on the Cu(100) Surface at 298 K from Quantum Mechanics Free Energy Calculations with Explicit Water

Cheng, Tao; Xiao, Hai; Goddard, William A.

doi:10.1021/jacs.6b08534

Title: Reaction Mechanisms for the Electrochemical Reduction of CO ₂ to CO and Formate on the Cu(100) Surface at 298 K from Quantum Mechanics Free Energy Calculations with Explicit Water

Journal Article · Tue Oct 11 00:00:00 EDT 2016 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/jacs.6b08534· OSTI ID:1334328

Cheng, Tao ^[1]; Xiao, Hai ^[1]; Goddard, William A. ^[1]

California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP) and Materials and Process Simulation Center (MSC)

Copper is the only elemental metal that reduces a significant fraction of CO₂ to hydrocarbons and alcohols, but the atomistic reaction mechanism that controls the product distributions is not known because it has not been possible to detect the reaction intermediates on the electrode surface experimentally, or to carry out Quantum Mechanics (QM) calculations with a realistic description of the electrolyte (water). We carry out QM calculations with an explicit description of water on the Cu(100) surface (experimentally shown to be stable under CO₂ reduction reaction conditions) to examine the initial reaction pathways to form CO and formate (HCOO^–) from CO₂ through free energy calculations at 298 K and pH 7. We find that CO formation proceeds from physisorbed CO₂ to chemisorbed CO₂ (*CO₂^δ-), with a free energy barrier of ΔG^‡ = 0.43 eV, the rate-determining step (RDS). The subsequent barriers of protonating *CO₂^δ- to form COOH* and then dissociating COOH* to form *CO are 0.37 and 0.30 eV, respectively. HCOO– formation proceeds through a very different pathway in which physisorbed CO₂ reacts directly with a surface H* (along with electron transfer), leading to ΔG^‡ = 0.80 eV. Thus, the competition between CO formation and HCOO^– formation occurs in the first electron-transfer step. On Cu(100), the RDS for CO formation is lower, making CO the predominant product. Therefore, to alter the product distribution, we need to control this first step of CO₂ binding, which might involve controlling pH, alloying, or changing the structure at the nanoscale.

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Research Organization:: California Institute of Technology (CalTech), Pasadena, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0004993

OSTI ID:: 1334328

Journal Information:: Journal of the American Chemical Society, Vol. 138, Issue 42; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 243 works

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Title: Reaction Mechanisms for the Electrochemical Reduction of CO ₂ to CO and Formate on the Cu(100) Surface at 298 K from Quantum Mechanics Free Energy Calculations with Explicit Water