Controlled chemical etching leads to efficient silicon–bismuth interface for photoelectrochemical CO2 reduction to formate

Pan, Ding; Hu, Yafei; Deng, Jun; Chen, J.; Zha, Chenyang; Yang, Hui; Han, Ning; Gong, Qiufang; Li, L.; Wang, T.; Zhao, Xiaodong; Li, Y.

doi:10.1016/j.mtchem.2018.10.009

Cited by 34 publications

(42 citation statements)

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“…It is worth noting that such values are higher than those measured for other Bi-modified Si photocathodes. [22,35] Moreover, the similarity between the LSV curves before and after electrolysis supports the good stability of the modified photocathode (Figure 4b). Such an electrochemical stability was not affected by post-electrolysis morphological changes of the initial structure to a dense array of Bi microsheets (Figure 1b) and the loss of a certain amount of the electrodeposited material (around 30 %), as supported by the decrease in the intensity of the Bi 4 f XPS signals (Figure 2a).…”

Section: Resultssupporting

confidence: 56%

“…Such observations are fully consistent with those reported by Ding et al in the frame of their study of Bi 3 + -assisted chemical etching of planar Si. [35] The presence of Bi on Si was confirmed by EDS ( Figures S3-S5). Bi and Si were identified as the principal elemental components for all the freshly Bi-modified surfaces with a smaller Bi content for Si/Bi5, well in line with the SEM and optical observations.…”

Section: Resultsmentioning

confidence: 83%

“…Such observations are fully consistent with those reported by Ding et al . in the frame of their study of Bi 3+ ‐assisted chemical etching of planar Si [35] …”

Section: Resultsmentioning

confidence: 99%

“…[22,35] In the first one, the catalytic coating was deposited onto oxide-free Si by a Bi 3 + -assisted chemical etching method from a bismuth salt solution containing hydrogen fluoride. [35] Although such a method offers some benefits in terms of simplicity, controlled morphology and thickness, the most efficient reported photocathode for CO 2 -to-formate conversion yielded relatively low cathodic photocurrent densities of ca. 10 mA cm À 2 at À 1.0 V vs Reversible Hydrogen Electrode (RHE) under simulated sunlight.…”

Section: Introductionmentioning

confidence: 99%

“…In spite of favorable energy levels properties, the integration of Bi‐based catalysts onto semiconducting silicon electrodes for the CO 2 photoelectrochemical conversion has been only reported very recently in two studies [22,35] . In the first one, the catalytic coating was deposited onto oxide‐free Si by a Bi 3+ ‐assisted chemical etching method from a bismuth salt solution containing hydrogen fluoride [35] . Although such a method offers some benefits in terms of simplicity, controlled morphology and thickness, the most efficient reported photocathode for CO 2 ‐to‐formate conversion yielded relatively low cathodic photocurrent densities of ca.…”

Section: Introductionmentioning

confidence: 99%

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Bismuth‐Decorated Silicon Photocathodes for CO₂‐to‐Formate Solar‐Driven Conversion

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The integration of metal-based catalysts onto semiconducting electrodes provides a real benefit for the CO 2 electrochemical conversion because it allows the electrochemical process to be activated by photogenerated electrons. In that context, we report here that silicon photocathodes modified with electrodeposited Bi nanostructures are highly active for the photoelectrocatalytic conversion of CO 2 to formate. Through the consumed electrical charge and the electrodeposition time, it is possible to finely control both the structure and the density of the deposited catalyst. The optimal photocathode was prepared by using a 5 s electrodeposition time and exhibited the highest photocurrent density (À 24.1 mA cm À 2) with partial formate photocurrent density j formate = À 17.4 mA cm À 2 at À 1.03 V vs Reversible Hydrogen Electrode (RHE), i. e. a 0.84 V overpotential for CO 2 to formate conversion in CO 2-saturated 0.5 M KHCO 3 solution. Such values highlight the excellent photoelectrocatalytic activity of our photocathodes.

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Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 83%

“…Such observations are fully consistent with those reported by Ding et al . in the frame of their study of Bi 3+ ‐assisted chemical etching of planar Si [35] …”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bismuth‐Decorated Silicon Photocathodes for CO₂‐to‐Formate Solar‐Driven Conversion

Tourneur

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et al. 2020

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Alloyed Palladium–Silver Nanowires Enabling Ultrastable Carbon Dioxide Reduction to Formate

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Palladium can enable the electrochemical CO2 reduction to formate with nearly zero overpotential and good selectivity. However, it usually has very limited stability owing to CO poisoning from the side reaction intermediate. Herein, it is demonstrated that alloying palladium with silver is a viable strategy to significantly enhance the electrocatalytic stability. Palladium–silver alloy nanowires are prepared in aqueous solution with tunable chemical compositions, large aspect ratio, and roughened surfaces. Thanks to the unique synergy between palladium and silver, these nanowires exhibit outstanding electrocatalytic performances for selective formate production. Most remarkably, impressive long‐term stability is measured even at < ‐0.4 V versus reversible hydrogen electrode where people previously believed that formate cannot be stably formed on palladium. Such stability results from the enhanced CO tolerance and selective stabilization of key reaction intermediates on alloy nanowires as supported by detailed electrochemical characterizations and theoretical computations.

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Powering the World with Solar Fuels from Photoelectrochemical CO₂ Reduction: Basic Principles and Recent Advances

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et al. 2022

Advanced Energy Materials

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Carbon neutrality has become an urgent mission for the future of mankind. Powering the world with renewable energy from solar CO2 reduction represents a promising way to accomplish this target. Photoelectrochemical (PEC) CO2 reduction, integrating the merits of photocatalysis and electrocatalysis, offers an intriguing and effective approach to realizing solar fuel production and CO2 mitigation in one shot. To stimulate research efforts in PEC CO2 reduction, a comprehensive review of recent advances in this field is presented, with a special emphasis on the general design motives for the assembly of highly efficient PEC cells. First, basic principles and evaluating parameters of PEC CO2 reduction cells are introduced. Then, recent innovative PEC cells with highly active photocathodes for CO2 reduction to different target chemicals are highlighted and the material designing principles are discussed. In addition, the representative self‐biased PEC CO2 reduction cells including the tandem and artificial‐leaf configurations are also addressed. Finally, this review is concluded with remarks on the present achievements in PEC CO2 reduction to different chemicals, pointing out some effective strategies to promote the efficiencies for solar fuel production. A vision of the challenges and opportunities for how to forward PEC CO2 reduction research is further provided.

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Controlled chemical etching leads to efficient silicon–bismuth interface for photoelectrochemical CO2 reduction to formate

Cited by 34 publications

References 34 publications

Bismuth‐Decorated Silicon Photocathodes for CO₂‐to‐Formate Solar‐Driven Conversion

Bismuth‐Decorated Silicon Photocathodes for CO₂‐to‐Formate Solar‐Driven Conversion

Alloyed Palladium–Silver Nanowires Enabling Ultrastable Carbon Dioxide Reduction to Formate

Powering the World with Solar Fuels from Photoelectrochemical CO₂ Reduction: Basic Principles and Recent Advances

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Controlled chemical etching leads to efficient silicon–bismuth interface for photoelectrochemical CO2 reduction to formate

Cited by 34 publications

References 34 publications

Bismuth‐Decorated Silicon Photocathodes for CO2‐to‐Formate Solar‐Driven Conversion

Bismuth‐Decorated Silicon Photocathodes for CO2‐to‐Formate Solar‐Driven Conversion

Alloyed Palladium–Silver Nanowires Enabling Ultrastable Carbon Dioxide Reduction to Formate

Powering the World with Solar Fuels from Photoelectrochemical CO2 Reduction: Basic Principles and Recent Advances

Contact Info

Product

Resources

About

Bismuth‐Decorated Silicon Photocathodes for CO₂‐to‐Formate Solar‐Driven Conversion

Bismuth‐Decorated Silicon Photocathodes for CO₂‐to‐Formate Solar‐Driven Conversion

Powering the World with Solar Fuels from Photoelectrochemical CO₂ Reduction: Basic Principles and Recent Advances