N-doped graphene anchored ultrasmall Ir nanoparticles as bifunctional electrocatalyst for overall water splitting

Yao, Wenqing; Jiang, Xian; Li, Yulian; Zhao, Cuiting; Ding, Linfei; Sun, Dongmei; Tang, Yawen

doi:10.1016/j.gee.2021.01.011

Cited by 18 publications

(5 citation statements)

References 44 publications

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“…4c. 6,[45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] At the cell voltage of 1.7 V, this assembled electrolyzer device exhibits a high stability over 100 h that can maintain a constant current density of 10 mA cm −2 without obvious decrease in catalytic activity (Fig. 4d).…”

Section: Resultsmentioning

confidence: 97%

Anisotropic Strain Boosted Hydrogen Evolution Reaction Activity of F-NiCoMo LDH for Overall Water Splitting

Zhai

Zhou

et al. 2023

J. Electrochem. Soc.

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Layered double hydroxide (LDH) catalysts provide promising oxygen evolution reaction (OER) activity which can be employed in overall water splitting for hydrogen production. However, their weak surface hydrogen adsorption (Had) and high water dissociation energy can result in inferior hydrogen evolution reaction (HER) activity. Here, a highly efficient HER catalyst of F-doped NiCoMo LDH is successfully designed and synthesized through in-situ growing on nickel foam (F-NiCoMo LDH/NF) for overall water splitting. DFT calculations demonstrate that the introduction of Mo and F atoms in NiCo LDH can induce the generation of anisotropic lattice strain, resulting in the generation of high-energy active interface and shifting the d-band centers. Therefore, the adsorption energy of Had is optimized and the water dissociation energy barrier is decreased. As a result, this F-NiCoMo LDH/NF catalyst electrode displays a low overpotential of 107.5 mV at 10 mA cm-2 and a small Tafel slope of 67.2 mV dec-1 for HER. The assembled electrolyzer by employing this catalyst electrode requires only 1.83 V to deliver 300 mA cm−2 and operates stably for 100 hours.

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Section: Resultsmentioning

confidence: 97%

Anisotropic Strain Boosted Hydrogen Evolution Reaction Activity of F-NiCoMo LDH for Overall Water Splitting

Zhai

Zhou

et al. 2023

J. Electrochem. Soc.

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“…The ultra‐small Ir nanoparticles and N doping on the graphene surface generated a large number of defects, exposing more electrocatalytic active sites of the catalyst, making it suitable as a bifunctional electrode for overall water splitting. [ 136 ] Ding et al immobilized Co clusters containing single Ir atoms on an N‐C support to prepare a multiphase single‐atom cluster catalyst Co n Ir 1 /N‐C. The distance between the Ir single atoms and Co cluster was optimized to be ≈8 Å, which improved the configuration of critical intermediates.…”

Section: Optimization Of Performancementioning

confidence: 99%

Ru/Ir‐Based Electrocatalysts for Oxygen Evolution Reaction in Acidic Conditions: From Mechanisms, Optimizations to Challenges

Qin,

Chen,

Feng

et al. 2024

Advanced Science

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The generation of green hydrogen by water splitting is identified as a key strategic energy technology, and proton exchange membrane water electrolysis (PEMWE) is one of the desirable technologies for converting renewable energy sources into hydrogen. However, the harsh anode environment of PEMWE and the oxygen evolution reaction (OER) involving four‐electron transfer result in a large overpotential, which limits the overall efficiency of hydrogen production, and thus efficient electrocatalysts are needed to overcome the high overpotential and slow kinetic process. In recent years, noble metal‐based electrocatalysts (e.g., Ru/Ir‐based metal/oxide electrocatalysts) have received much attention due to their unique catalytic properties, and have already become the dominant electrocatalysts for the acidic OER process and are applied in commercial PEMWE devices. However, these noble metal‐based electrocatalysts still face the thorny problem of conflicting performance and cost. In this review, first, noble metal Ru/Ir‐based OER electrocatalysts are briefly classified according to their forms of existence, and the OER catalytic mechanisms are outlined. Then, the focus is on summarizing the improvement strategies of Ru/Ir‐based OER electrocatalysts with respect to their activity and stability over recent years. Finally, the challenges and development prospects of noble metal‐based OER electrocatalysts are discussed.

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“…Currently, hydrogen is considered a promising clean energy source for efficient electricity conversion and storage through electrocatalytic water splitting, which produces high-purity hydrogen that can be used without further separation or purification. − Typically, when electrolyzing water, two reactions take place: the hydrogen evolution reaction (HER) occurs at the cathode, while the oxygen evolution reaction (OER) occurs at the anode. − The OER is more complex and slower in kinetics compared to the HER, as it involves a four-electron transfer, while the HER only involves a two-electron transformation. − This requires efficient electrocatalysts with high activity and stability to overcome the overpotential barrier. Currently, precious metals such as Pt and IrO 2 are considered benchmark catalysts for the HER and OER, but their limited availability and high expense pose obstacles to widespread production and practical utilization. − As a result, it is imperative to create catalysts utilizing more readily available nonprecious metal resources that can heighten electrocatalytic efficiency and longevity, while simultaneously reducing the reliance on precious metals. Nevertheless, this is a formidable task.…”

Section: Introductionmentioning

confidence: 99%

Self-Adaptive Dual-Site Synergy with an Optimized Electronic Configuration for Overall Water Splitting in Acidic Media

Lin,

Peng,

Lin

et al. 2023

ACS Sustainable Chem. Eng.

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In harsh acidic environments, there remains a demand for catalysts that possess both high activity and stability, enabling them to efficiently enhance the slow kinetics of the hydrogen evolution reaction and oxygen evolution reaction, which are crucial for the advancement of proton exchange membrane water electrolyzers. Herein, a bifunctional electrocatalyst was designed by synergistically modulating the electronic and coordination properties. The IrO x /MnO x catalyst was successfully created, surpassing the activity and stability limitations of IrO 2 catalysts for acidic overall water splitting, thereby pushing the boundaries of electrocatalytic performance. When used as both electrodes in an overall water-splitting cell, the IrO x /MnO x catalyst achieved a current density of 10 mA cm −2 at 1.51 V for 36 h without any noticeable degradation, which greatly outperformed the commercial couples (Pt/C||IrO 2 , 1.65 V) in acidic media. Of greater significance, X-ray absorption spectroscopy deciphered that the unsaturated Ir centers, which have an electron-rich nature, can lower energy barriers associated with the proton adsorption and desorption and oxygenated reactant species through a self-adaptive surface reconstruction process. This work introduces an approach to boost the intrinsic performance of catalysts for overall water splitting by constructing unsaturated coordination centers, offering a promising strategy for catalyst design.

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N-doped graphene anchored ultrasmall Ir nanoparticles as bifunctional electrocatalyst for overall water splitting

Cited by 18 publications

References 44 publications

Anisotropic Strain Boosted Hydrogen Evolution Reaction Activity of F-NiCoMo LDH for Overall Water Splitting

Anisotropic Strain Boosted Hydrogen Evolution Reaction Activity of F-NiCoMo LDH for Overall Water Splitting

Ru/Ir‐Based Electrocatalysts for Oxygen Evolution Reaction in Acidic Conditions: From Mechanisms, Optimizations to Challenges

Self-Adaptive Dual-Site Synergy with an Optimized Electronic Configuration for Overall Water Splitting in Acidic Media

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