Ru/NC heterointerfaces boost energy-efficient production of green H2 over a wide pH range

Yang, Qifeng; Zhu, Botao; Wang, Feng; Zhang, Cunjin; Cai, Jiejin; Jin, Peng; Feng, Lai

doi:10.1007/s12274-022-4148-2

Cited by 27 publications

(20 citation statements)

References 47 publications

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“…The increased Cd 3d binding energies imply their lowered electron-cloud density, while the declined Co 2p binding energies suggest the raised Co electron-cloud density. The opposite variation of the Cd and Co electron-cloud densities manifests that electrons are transferred from CdS to CoP-CN after their combination, which also hints at the existence of a strong interaction and an intimate heterointerface . We can notice from Figure b that a new Co 2p peak at 783.7 eV appears in the 70%-CdS/CoP-CN composite, which could be ascribed to the Co–S species derived from the chemical bonding of CdS and CoP-CN.…”

Section: Resultsmentioning

confidence: 87%

“…In addition, deconvolution of the N 1s spectrum yields the components The opposite variation of the Cd and Co electron-cloud densities manifests that electrons are transferred from CdS to CoP-CN after their combination, which also hints at the existence of a strong interaction and an intimate heterointerface. 46 We can notice from Figure 5b ) compared to the 70%-CdS/Co 3 O 4 and 70%-CdS/CoO-CN counterparts. Moreover, the photocatalytic performance of 70%-CdS/CoP can be further promoted via the introduction of a graphitic CN electron mediator (70%-CdS/CoP-CN).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

Wang²,

Wang

et al. 2023

ACS Appl. Nano Mater.

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Photocatalytic water splitting using semiconductor-based catalysts is a promising avenue to gain H2 fuel from renewable solar energy. Nonetheless, developing earth-abundant and visible-light-responsive photocatalysts for efficient H2 production still remains a huge challenge. In this work, unique two-dimensional hierarchitectures of S-deficient CdS integrated with ultrafine CoP nanocrystals embedding in graphitic N-doped C (CoP-CN) nanosheets are fabricated for the first time. Noticeably, the graphitic CN electron mediator not only enhances the photocatalytic stability of CdS/CoP-CN composites by protecting CoP from external corrosion but also induces the formation of an ohmic junction to boost electron extraction from CdS to CoP efficiently. Meanwhile, the S vacancies in CdS serve as electron traps to further enhance the separation of photogenerated carriers. Such unique CdS/CoP-CN hierarchical hybrid nanosheets exhibited an extraordinary visible-light-induced (λ > 400 nm) photocatalytic H2-evolving performance, delivering a high apparent quantum yield (26.3% at 420 nm) and an excellent H2 generation rate of 54.01 mmol·g–1·h–1, much superior to those of a CdS/CoP Schottky junction, Pt-loaded CdS, and a vast amount of CdS-based photocatalysts ever reported. In addition, the outstanding H2-evolving durability of CdS/CoP-CN composites was verified by cycling and long-term photocatalytic tests. The findings presented here are anticipated to enlighten the rational design and synthesis of highly active photocatalysts with an ohmic junction for application in energy and environment-related domains.

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Section: Resultsmentioning

confidence: 87%

Section: ■ Results and Discussionmentioning

confidence: 99%

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

Wang²,

Wang

et al. 2023

ACS Appl. Nano Mater.

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“…For instance, Ru‐nanocluster‐modified nanospheres realize high catalytic activity and stability towards both HzOR and HER in all‐pH electrolytes ( Figure 15 a). [ 172 ] When used as both anode and cathode for HzOR‐assisted water splitting, the cell potentials of 39/429, 405/926, and 164/1141 mV were required to achieve the current density of 10/100 mA cm −2 in alkaline, acidic and neutral media, respectively (Figure 15c,d). A single‐junction silicon solar cell with an output voltage of 0.54V was applied to drive the HzOR‐assisted water splitting system in alkaline system, wherein green H 2 can be generated upon natural solar irradiation (Figure 15b).…”

Section: Organic Compound‐assisted Water Splittingmentioning

confidence: 99%

Progress and Perspectives for Solar‐Driven Water Electrolysis to Produce Green Hydrogen

Zhao

Yuan

2023

Advanced Energy Materials

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energy system is among the most promising solutions to solve the above issues. Substituting the current energy carrier with a sustainable fuel is one of the crucial points in the system. Hydrogen as a green and high energy density carrier, primarily derived from water, can satisfy the requirement of sustainable development and facilitate environmental protection and energy conservation. Nowadays, hydrogen is mainly produced from numerous nonrenewable energy such as fossil fuels and biomass for practical applications. [1][2][3] Water electrolysis is a hopeful strategy for efficient and sustainable hydrogen production, but not cost-effective due to the need for large electricity consumption. [4,5] It remains challenging to achieve highly effective hydrogen production with lowcost and renewable energy.Sunlight is an endlessly renewable energy source, which can substitute fossil fuels. In this regard, coupling of sunlight and water electrolysis is desperately needed. The photovoltaic module coupled with water electrolyzers (PV-EC) to achieve the direct conversion of solar energy into hydrogen fuel is a good choice for sustainable energy system. The solar-driven water electrolysis can be achieved through the electrical power generated by a photovoltaic system for driving an external water electrolyzer. [6][7][8] The solar cells do not need to immerse into the electrolyte and not be vulnerable to corrosion in this configuration. However, the high cost of solar photovoltaic devices limits its practical applications. Integrated photoelectrochemical (PEC) devices comprising a photovoltaic device and a water electrolyzer in a single device have aroused much attention. [9][10][11] It allows the direct coupling of light absorbers and catalysts, which could reduce the cost and mechanical limitations. One of the most prominent works is the "artificial leaf", which comprises a triple junction and amorphous silicon photovoltaic interfaced to hydrogen-and oxygen-evolving catalyst for achieving an efficiency of 4.7%. [12] Considering the fluctuating output power and intrinsically intermittent nature of solar energy, a rechargeable energy storage device could be introduced to serve as a reservoir to offer a stable electrical output and accommodate solar energy. The PV-ES-EC system can thus be achieved through the fabrication of an efficient energy storage device to couple the photovoltaic device and water electrolyzer.Notably, the above solar-driven water electrolysis systems require highly conductive and stable separators, highly Solar-driven water electrolysis has been considered to be a promising route to produce green hydrogen, because the conventional water electrolysis system is not completely renewable as it requires power from nonrenewable fossil fuel sources. This review emphasizes the strategies for solar-driven water electrolysis, including the construction of photovoltaic (PV)-water electrolyzer systems, PV-rechargeable energy storage devicewater electrolyzer systems with solar energy as the sole input energy, and photo...

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“…Ruthenium (Ru) has shown excellent performance in electrolytic water splitting due to its platinum-like properties and low price. 15,16 A series of Ru-based composites, such as Ru nanodendrites, RuM alloys (M = Ni, Co, etc. ), Ru nanoparticles or single Ru atoms dispersed on nitrogen-doped mesoporous carbon spheres, sulfuric-doped graphene, etc.…”

Section: Introductionmentioning

confidence: 99%

Enhanced interaction between Ru nanoparticles and N, C-modified mesoporous TiO₂for efficient electrocatalytic hydrogen evolution at all pH values

Xie

Cao

et al. 2022

J. Mater. Chem. A

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Ru/NC heterointerfaces boost energy-efficient production of green H2 over a wide pH range

Cited by 27 publications

References 47 publications

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

Progress and Perspectives for Solar‐Driven Water Electrolysis to Produce Green Hydrogen

Enhanced interaction between Ru nanoparticles and N, C-modified mesoporous TiO₂for efficient electrocatalytic hydrogen evolution at all pH values

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Ru/NC heterointerfaces boost energy-efficient production of green H2 over a wide pH range

Cited by 27 publications

References 47 publications

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H2 Evolution

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H2 Evolution

Progress and Perspectives for Solar‐Driven Water Electrolysis to Produce Green Hydrogen

Enhanced interaction between Ru nanoparticles and N, C-modified mesoporous TiO2for efficient electrocatalytic hydrogen evolution at all pH values

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Product

Resources

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CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

Enhanced interaction between Ru nanoparticles and N, C-modified mesoporous TiO₂for efficient electrocatalytic hydrogen evolution at all pH values