General Construction of Molybdenum‐Based Nanowire Arrays for pH‐Universal Hydrogen Evolution Electrocatalysis

Abstract

Robustly integrated electrodes constructed by well-organized building blocks of active materials are appealing in versatile electrochemical systems. Herein, orderly oriented nanowire arrays (NWAs) of multiple molybdenum-based compounds (MoX n , MoX n = MoP, MoS 2 , Mo 2 C, MoN, and MoO 2 ) on carbon fiber paper (CFP) are generally fabricated by topotactic transformations from molybdenum-containing precursor NWAs. Extensive structural characterizations reveal that these MoX n nanowires are composed of either closely interconnected nanoparticles or edge-rich nanosheets. When being used as self-supported electrodes, these MoX n NWAs/CFP exhibit excellent catalytic activities and stabilities toward hydrogen evolution reaction (HER) in pH-universal electrolytes. Especially, the best-performed MoP NWAs/CFP shows comparable or even superior HER performance over platinum benchmark, which holds great promises in HER-related energy technologies. This work presents a simple yet effective approach toward general synthesis of self-supported Mo-based NWAs on CFP, which also possesses huge application prospects in other fields, such as supercapacitors, batteries, and sensors.

Boosting Hydrogen Evolution Reaction on Co9S8 in Neutral Media Leveraging Oxophilic CrOx Mosaic Dopant

“…The exceptional HER performance of CrO x ‐Co 9 S 8 /CuCrS 2 rivals that of commercial Pt/C (Figure 3c) and surpasses that of recently reported non‐precious electrocatalysts in neutral electrolytes (Figure 3d; Table S2, Supporting Information). [ 6,7,17–38 ] This establishes CrO x ‐Co 9 S 8 /CuCrS 2 as a highly promising non‐Pt catalysts for sustainable hydrogen production in neutral electrolytes.…”

Boosting Hydrogen Evolution Reaction on Co9S8 in Neutral Media Leveraging Oxophilic CrOx Mosaic Dopant

“…The exceptional HER performance of CrO x ‐Co 9 S 8 /CuCrS 2 rivals that of commercial Pt/C (Figure 3c) and surpasses that of recently reported non‐precious electrocatalysts in neutral electrolytes (Figure 3d; Table S2, Supporting Information). [ 6,7,17–38 ] This establishes CrO x ‐Co 9 S 8 /CuCrS 2 as a highly promising non‐Pt catalysts for sustainable hydrogen production in neutral electrolytes.…”

Vanadium Nitride Nanowires Array on Carbon Nanofiber Paper for Regulating Polysulfides Toward Stable Freestanding Sulfur Cathode

“…The scanning electron microscopy (SEM) image reveals that CFP consists of nanofibers with smooth surface (Figure 1b), while CFP-VO x displays a morphology resembling bottle brushes, in which VO x nanowires are uniformly grown on the surface of CFP nanofibers to form nanowires array (Figure 1c). [27,28] After annealing treatment in an ammonia atmosphere, VO x on the surface of CFP was transformed into VN with the maintenance of nanowires array morphology (Figure 1d). The average diameter of the VN nanowires is ≈70 nm (Figure 1e).…”

Ruthenium Nanoclusters and Single Atoms on α‐MoC/N‐Doped Carbon Achieves Low‐Input/Input‐Free Hydrogen Evolution via Decoupled/Coupled Hydrazine Oxidation

“…Specifically, the Mo-based precursor nanowire arrays with a diameter of about 200 nm (Figure S1, Supporting Informa-tion) were successfully grown within carbon nanofibers using a solvothermal reaction at 200 °C. [18] Then, the melamine was employed as carbon source and reductive agent to produce the MoC x -based intermediates . The sintering temperature played a crucial role in obtaining the desired samples.…”

“…Finally, the resulting material is decorated with Ru species, including both single‐atom sites and nanocluster sites, resulting in the formation of the final sample. Specifically, the Mo‐based precursor nanowire arrays with a diameter of about 200 nm (Figure S1, Supporting Information) were successfully grown within carbon nanofibers using a solvothermal reaction at 200 °C [18] . Then, the melamine was employed as carbon source and reductive agent to produce the MoC x ‐based intermediates .…”

Boosting Hydrogen Evolution Reaction on Co9S8 in Neutral Media Leveraging Oxophilic CrOx Mosaic Dopant

“…The exceptional HER performance of CrO x ‐Co 9 S 8 /CuCrS 2 rivals that of commercial Pt/C (Figure 3c) and surpasses that of recently reported non‐precious electrocatalysts in neutral electrolytes (Figure 3d; Table S2, Supporting Information). [ 6,7,17–38 ] This establishes CrO x ‐Co 9 S 8 /CuCrS 2 as a highly promising non‐Pt catalysts for sustainable hydrogen production in neutral electrolytes.…”

Vanadium Nitride Nanowires Array on Carbon Nanofiber Paper for Regulating Polysulfides Toward Stable Freestanding Sulfur Cathode

“…The scanning electron microscopy (SEM) image reveals that CFP consists of nanofibers with smooth surface (Figure 1b), while CFP-VO x displays a morphology resembling bottle brushes, in which VO x nanowires are uniformly grown on the surface of CFP nanofibers to form nanowires array (Figure 1c). [27,28] After annealing treatment in an ammonia atmosphere, VO x on the surface of CFP was transformed into VN with the maintenance of nanowires array morphology (Figure 1d). The average diameter of the VN nanowires is ≈70 nm (Figure 1e).…”

Ruthenium Nanoclusters and Single Atoms on α‐MoC/N‐Doped Carbon Achieves Low‐Input/Input‐Free Hydrogen Evolution via Decoupled/Coupled Hydrazine Oxidation

“…Specifically, the Mo-based precursor nanowire arrays with a diameter of about 200 nm (Figure S1, Supporting Informa-tion) were successfully grown within carbon nanofibers using a solvothermal reaction at 200 °C. [18] Then, the melamine was employed as carbon source and reductive agent to produce the MoC x -based intermediates . The sintering temperature played a crucial role in obtaining the desired samples.…”

“…Finally, the resulting material is decorated with Ru species, including both single‐atom sites and nanocluster sites, resulting in the formation of the final sample. Specifically, the Mo‐based precursor nanowire arrays with a diameter of about 200 nm (Figure S1, Supporting Information) were successfully grown within carbon nanofibers using a solvothermal reaction at 200 °C [18] . Then, the melamine was employed as carbon source and reductive agent to produce the MoC x ‐based intermediates .…”

Boosting Hydrogen Evolution Reaction on Co9S8 in Neutral Media Leveraging Oxophilic CrOx Mosaic Dopant

“…The exceptional HER performance of CrO x ‐Co 9 S 8 /CuCrS 2 rivals that of commercial Pt/C (Figure 3c) and surpasses that of recently reported non‐precious electrocatalysts in neutral electrolytes (Figure 3d; Table S2, Supporting Information). [ 6,7,17–38 ] This establishes CrO x ‐Co 9 S 8 /CuCrS 2 as a highly promising non‐Pt catalysts for sustainable hydrogen production in neutral electrolytes.…”

Vanadium Nitride Nanowires Array on Carbon Nanofiber Paper for Regulating Polysulfides Toward Stable Freestanding Sulfur Cathode

“…The scanning electron microscopy (SEM) image reveals that CFP consists of nanofibers with smooth surface (Figure 1b), while CFP-VO x displays a morphology resembling bottle brushes, in which VO x nanowires are uniformly grown on the surface of CFP nanofibers to form nanowires array (Figure 1c). [27,28] After annealing treatment in an ammonia atmosphere, VO x on the surface of CFP was transformed into VN with the maintenance of nanowires array morphology (Figure 1d). The average diameter of the VN nanowires is ≈70 nm (Figure 1e).…”

Ruthenium Nanoclusters and Single Atoms on α‐MoC/N‐Doped Carbon Achieves Low‐Input/Input‐Free Hydrogen Evolution via Decoupled/Coupled Hydrazine Oxidation

“…Specifically, the Mo-based precursor nanowire arrays with a diameter of about 200 nm (Figure S1, Supporting Informa-tion) were successfully grown within carbon nanofibers using a solvothermal reaction at 200 °C. [18] Then, the melamine was employed as carbon source and reductive agent to produce the MoC x -based intermediates . The sintering temperature played a crucial role in obtaining the desired samples.…”

“…Finally, the resulting material is decorated with Ru species, including both single‐atom sites and nanocluster sites, resulting in the formation of the final sample. Specifically, the Mo‐based precursor nanowire arrays with a diameter of about 200 nm (Figure S1, Supporting Information) were successfully grown within carbon nanofibers using a solvothermal reaction at 200 °C [18] . Then, the melamine was employed as carbon source and reductive agent to produce the MoC x ‐based intermediates .…”