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Wang, Xue; Ou, Pengfei; Wicks, Joshua; Xie, Yi; Wang, Ying; Li, Jun; Tam, Jason; Ren, Dan; Howe, Jane Y.; Wang, Ziyun; Ozden, Adnan; Finfrock, Y. Zou; Xu, Yi; Li, Yuhang; Rasouli, Armin Sedighian; Bertens, Koen; Ip, Alexander H.; Graetzel, Michael; Sinton, David; Sargent, Edward H.
Nature communications, 06/2021, Letnik: 12, Številka: 1Journal Article
Abstract The renewable-electricity-powered CO 2 electroreduction reaction provides a promising means to store intermittent renewable energy in the form of valuable chemicals and dispatchable fuels. Renewable methane produced using CO 2 electroreduction attracts interest due to the established global distribution network; however, present-day efficiencies and activities remain below those required for practical application. Here we exploit the fact that the suppression of *CO dimerization and hydrogen evolution promotes methane selectivity: we reason that the introduction of Au in Cu favors *CO protonation vs. C−C coupling under low *CO coverage and weakens the *H adsorption energy of the surface, leading to a reduction in hydrogen evolution. We construct experimentally a suite of Au-Cu catalysts and control *CO availability by regulating CO 2 concentration and reaction rate. This strategy leads to a 1.6× improvement in the methane:H 2 selectivity ratio compared to the best prior reports operating above 100 mA cm −2 . We as a result achieve a CO 2 -to-methane Faradaic efficiency (FE) of (56 ± 2)% at a production rate of (112 ± 4) mA cm −2 .
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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