A p-Si/NiCoSe<sub>x</sub>core/shell nanopillar array photocathode for enhanced photoelectrochemical hydrogen production

Zhang, Hongxiu; Ding, Qi; He, Duanwei; Liu, Hu; Liu, Wei; Li, Zhongjian; Yang, Bin; Zhang, Qizhou; Lei, Lecheng; Jin, Song

doi:10.1039/c6ee02215d

Cited by 168 publications

(133 citation statements)

References 56 publications

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“…Using PECD, other HER catalysts, e.g., MoS x O y , CoMoS x , NiCoSe x , and CoP, have also been reported to couple to different photocathodes for light‐driven H 2 production. In many cases, the catalyst layers are usually directly photodeposited on semiconductor photoelectrodes without introducing an interlayer, and they offer, besides high catalytic activity, good passivation to semiconductors against corrosion given their exceptional electrochemical stability, exhibiting promising bi‐functionality.…”

Section: Strategies For Semiconductor/electrocatalyst Couplingmentioning

confidence: 99%

Strategies for Semiconductor/Electrocatalyst Coupling toward Solar‐Driven Water Splitting

et al. 2020

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Hydrogen (H2) has a significant potential to enable the global energy transition from the current fossil‐dominant system to a clean, sustainable, and low‐carbon energy system. While presently global H2 production is predominated by fossil‐fuel feedstocks, for future widespread utilization it is of paramount importance to produce H2 in a decarbonized manner. To this end, photoelectrochemical (PEC) water splitting has been proposed to be a highly desirable approach with minimal negative impact on the environment. Both semiconductor light‐absorbers and hydrogen/oxygen evolution reaction (HER/OER) catalysts are essential components of an efficient PEC cell. It is well documented that loading electrocatalysts on semiconductor photoelectrodes plays significant roles in accelerating the HER/OER kinetics, suppressing surface recombination, reducing overpotentials needed to accomplish HER/OER, and extending the operational lifetime of semiconductors. Herein, how electrocatalyst coupling influences the PEC performance of semiconductor photoelectrodes is outlined. The focus is then placed on the major strategies developed so far for semiconductor/electrocatalyst coupling, including a variety of dry processes and wet chemical approaches. This Review provides a comprehensive account of advanced methodologies adopted for semiconductor/electrocatalyst coupling and can serve as a guideline for the design of efficient and stable semiconductor photoelectrodes for use in water splitting.

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Section: Strategies For Semiconductor/electrocatalyst Couplingmentioning

confidence: 99%

Strategies for Semiconductor/Electrocatalyst Coupling toward Solar‐Driven Water Splitting

et al. 2020

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“…Impressive HER performance, n-type semiconductor property and good light-harvesting ability of NiFeSe@NiSe|O@CC could also make it an effective cocatalyst and type-II heterojunction candidate when combined with p-type silicon (Si) as a photocathode material for PEC water splitting (Figure 5e). [26] Electrochemical impedance measurements further verify the enhanced carrier transport of NiFeSe@NiSe|O-Si through smaller charge transfer resistance ( Figure S31, Supporting Information). The delivered photocurrent densities of all the samples under light off condition are negligible as seen from Figure 5f.…”

Section: Resultsmentioning

confidence: 77%

Pseudomorphic Transformation of Interpenetrated Prussian Blue Analogs into Defective Nickel Iron Selenides for Enhanced Electrochemical and Photo‐Electrochemical Water Splitting

Yilmaz

Tan

Lim

et al. 2018

Advanced Energy Materials

163

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A significant methodology gap remains in the construction of advanced electrocatalysts, which has collaborative defective functionalities and structural coherence that maximizes electrochemical redox activity, electrical conductivity, and mass transport characteristics. Here, a coordinative self‐templated pseudomorphic transformation of an interpenetrated metal organic compound network is conceptualized into a defect‐rich porous framework that delivers highly reactive and durable photo(electro)chemical energy conversion functionalities. The coordinative‐template approach enables previously inaccessible synthesis routes to rationally accomplish an interconnected porous conductive network at the microscopic level, while exposing copious unsaturated reactive sites at the atomic level without electronic or structural integrity trade‐offs. Consequently, porous framework, interconnected motifs, and engineered defects endow remarkable electrocatalytic hydrogen evolution reaction and oxygen evolution reaction activity due to intrinsically improved turnover frequency, electrochemical surface area, and charge transfer. Moreover, when the hybrid is coupled with a silicon photocathode for solar‐driven water splitting, it enables photon assisted redox reactions, improved charge separation, and enhanced carrier transport via the built‐in heterojunction and additive co‐catalyst functionality, leading to a promising photo(electro)chemical hydrogen generation performance. This work signifies a viable and generic approach to prepare other functional interconnected metal organic coordinated compounds, which can be exploited for diverse energy storage, conversion, or environmental applications.

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“…To highlight the advantage of PEC photosynthesis relative to conventional electrosynthesis,w es ubsequently investigated the electrochemical reduction of maleic acid on heattreated titanium (Ti/TiO 2 ) [22] and lead-two common electrode materials used widely in previous studies with reported Faradaic efficiencies typically in the range of 70-90 %. [12,20] As depicted in Figure 2c,the polarization curves on Ti/TiO 2 and lead exhibited more negative onset potentials of À0.21 Vand À0.30 V, respectively;a nd their potentials required to reach ac athodic current density of 10 mA cm À2 were À0.68 Vand À0.48 V, respectively.T he Si NW photocathode displayed markedly improved performance in solar-assisted maleic acid reduction relative to Ti/TiO 2 and lead.…”

Section: Angewandte Chemiementioning

confidence: 99%

“…125 mL) was collected and characterized by nuclear magnetic resonance (NMR). [12,22] Thev ery high Faradaic efficiency for the quantitative transformation of maleic acid to succinic acid on the Si NW photocathode therefore presents another advantage over conventional electrosynthesis. Based on its concentration in the catholyte,w ec alculated the Faradaic efficiencyf or succinic acid (Figure 2e).…”

Section: Angewandte Chemiementioning

confidence: 99%

Photoelectroreduction of Building‐Block Chemicals

et al. 2017

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Conventional photoelectrochemical cells utilize solar energy to drive the chemical conversion of water or CO into useful chemical fuels. Such processes are confronted with general challenges, including the low intrinsic activities and inconvenient storage and transportation of their gaseous products. A photoelectrochemical approach is proposed to drive the reductive production of industrial building-block chemicals and demonstrate that succinic acid and glyoxylic acid can be readily synthesized on Si nanowire array photocathodes free of any cocatalyst and at room temperature. These photocathodes exhibit a positive onset potential, large saturation photocurrent density, high reaction selectivity, and excellent operation durability. They capitalize on the large photovoltage generated from the semiconductor/electrolyte junction to partially offset the required external bias, and thereby make this photoelectrosynthetic approach significantly more sustainable compared to traditional electrosynthesis.

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A p-Si/NiCoSe_xcore/shell nanopillar array photocathode for enhanced photoelectrochemical hydrogen production

Abstract: We report the rational design and successful preparation of p-Si/NiCoSex core/shell nanopillar array photocathodes for enhanced solar-driven photoelectrochemical hydrogen generation.

Cited by 168 publications

References 56 publications

Strategies for Semiconductor/Electrocatalyst Coupling toward Solar‐Driven Water Splitting

Strategies for Semiconductor/Electrocatalyst Coupling toward Solar‐Driven Water Splitting

Pseudomorphic Transformation of Interpenetrated Prussian Blue Analogs into Defective Nickel Iron Selenides for Enhanced Electrochemical and Photo‐Electrochemical Water Splitting

Photoelectroreduction of Building‐Block Chemicals

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A p-Si/NiCoSexcore/shell nanopillar array photocathode for enhanced photoelectrochemical hydrogen production

Abstract: We report the rational design and successful preparation of p-Si/NiCoSex core/shell nanopillar array photocathodes for enhanced solar-driven photoelectrochemical hydrogen generation.

Cited by 168 publications

References 56 publications

Strategies for Semiconductor/Electrocatalyst Coupling toward Solar‐Driven Water Splitting

Strategies for Semiconductor/Electrocatalyst Coupling toward Solar‐Driven Water Splitting

Pseudomorphic Transformation of Interpenetrated Prussian Blue Analogs into Defective Nickel Iron Selenides for Enhanced Electrochemical and Photo‐Electrochemical Water Splitting

Photoelectroreduction of Building‐Block Chemicals

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A p-Si/NiCoSe_xcore/shell nanopillar array photocathode for enhanced photoelectrochemical hydrogen production