@article{35381,
  author = {Alex J King and Justin C Bui and Alexis T Bell and Adam Z Weber},
  title = {Establishing the Role of Operating Potential and Mass Transfer in Multicarbon Product Generation for Photoelectrochemical CO2},
  abstract = {<p><span>There is increasing interest in the possibility of photoelectrochemical (PEC) reduction of CO</span><sub><span>2</span></sub><span>\&nbsp;to C</span><sub><span>2+</span></sub><span>\&nbsp;products; however, the criteria for maximizing PEC solar-to-C</span><sub><span>2+</span></sub><span>\&nbsp;(STC</span><sub><span>2+</span></sub><span>) rates are not well understood. We report here a continuum-scale model of PEC CO</span><sub><span>2</span></sub><span>\&nbsp;reduction (CO</span><sub><span>2</span></sub><span>R) on Cu in 0.1 M CsHCO</span><sub><span>3</span></sub><span>\&nbsp;and use it to optimize the design and operating conditions for generating C</span><sub><span>2+</span></sub><span>\&nbsp;products. We demonstrate that the potential-dependent product distribution of CO</span><sub><span>2</span></sub><span>R on Cu requires operating near the potential that maximizes C</span><sub><span>2+</span></sub><span>\&nbsp;generation rates (</span><em>V</em><span>id</span><span>), unlike PEC water splitting, which desires operation at the maximum photocurrent density. Because of this requirement, the criterion for a high STC</span><sub><span>2+</span></sub><span>\&nbsp;rate includes high-photocurrent semiconductors with photovoltages near\&nbsp;</span><em>V</em><span>id</span><span>\&nbsp;and low series resistance. The STC</span><sub><span>2+</span></sub><span>\&nbsp;rate in these systems is enhanced by optimal CO</span><sub><span>2</span></sub><span>\&nbsp;transport and exhibits low sensitivity to dirunal solar irradiance variations.</span></p>},
  year = {2022},
  booktitle = {ACS Energy Letters},
  journal = {ACS Energy Letters},
  series = {ACS Energy Letters},
  pages = {2694 - 2700},
  month = {07/2022},
  issn = {2380-8195},
  url = {https://pubs.acs.org/doi/10.1021/acsenergylett.2c01041},
  doi = {10.1021/acsenergylett.2c01041},
  language = {eng},
}