Carbon Cloth Supported Nitrogen Doped Porous Carbon Wrapped Co Nanoparticles for Effective Overall Water Splitting

Zhu, Jun; Shen, Xiaoping; Yue, Xiaoyang; Fan, Caimei; Kong, Lirong; Ji, Zhenyuan; Zhu, Guoxing; Xu, Keqiang; Zhou, Hu

doi:10.1002/cctc.202001689

Cited by 10 publications

(13 citation statements)

References 55 publications

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“…The comparison of their XPS survey spectra reconfirms the successful incorporation of S atoms within sample Co 4 Ni 1 S/CC (Figure 3a). For the oxide precursor, two C 1s peaks at 284.8 and 287.8 eV (Figure 3b) demonstrate the coexistence of C−C and CO, respectively; 42 after vulcanization, the CO signal is completely replaced by two emerging peaks of Me−C−O/N/S (286.2 eV) 43 and OC−O species (289.1 eV) 8 (Figure 3b). The vulcanization process is suggested to promote the formation of metal complexes and carbonates between NH 2 -TPA/glucosederived chars and Ni/Co ions.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…As such, the pursuit of bifunctional electrocatalysts with excellent activity and durability for both the OER and HER is hopeful to simplify the electrolyzer system, avoid mismatched HER/OER catalysts in the same electrolyte, and further lower the economic cost of water splitting. Meanwhile, abundant efforts have been made to develop low-cost alternative catalysts for the HER or OER, typically including first-row transition-metal (Ni, Co, Fe, and Mn) chalcogenides, , phosphides, carbides, nitrides, etc. To improve their sluggish HER and OER kinetics in the same electrolyte, diverse effective strategies have been developed to modify the dual-active structures by building a synergistic effect between dissimilar active species, controlling morphologies/decreasing dimension to increase utilization of active species, and applying conductive substrates to facilitate electron transfer .…”

Section: Introductionmentioning

confidence: 99%

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Integrated Bifunctional Electrodes Based on Amorphous Co–Ni–S Nanoflake Arrays with Atomic Dispersity of Active Sites for Overall Water Splitting

Dong

Zhi

Yang

et al. 2022

ACS Appl. Mater. Interfaces

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Fabrication of amorphous electrocatalysts without noble metals for cost-effective full water splitting is highly desired but remains a substantial challenge. In the present work, we report a facile strategy for exploring integrated bifunctional electrocatalysts based on amorphous cobalt/nickel sulfide nanoflake arrays self-supported on carbon cloth, by tailoring competitive coordination of metal ions between glucose and 2-aminoterephthalic acid. Ultrahigh dispersion of binary metal active sites with balanced atomic distribution enables the optimization of catalytic properties for both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) in an alkaline solution. The obtained catalyst exhibits remarkably enhanced OER and HER activities as compared with its oxide counterpart and analogues with different Co/Ni ratios. It requires overpotentials of 296 and 192 mV to deliver a current density of 10 mA cm −2 for the OER and HER, respectively; it retains 96.6 and 96.9% activity after 32 h of OER and 36 h of HER tests at 10 mA cm −2 , respectively. As directly used an anode and a cathode in an alkaline electrolyzer, a low cell voltage of 1.60 V could endow a water splitting current of 10 mA cm −2 , outperforming the benchmark RuO 2 and Pt/C-based electrolyzer at 1.72 V@10 mA cm −2 . The current synthetic strategy may provide more opportunities for the design and direct synthesis of amorphous catalysts for overall water splitting and beyond.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integrated Bifunctional Electrodes Based on Amorphous Co–Ni–S Nanoflake Arrays with Atomic Dispersity of Active Sites for Overall Water Splitting

Dong

Zhi

Yang

et al. 2022

ACS Appl. Mater. Interfaces

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“…[18] The broad peaks marked with asterisks at around 24°and 43°are related to (002) and (100) planes of carbon cloth. [19] With Fe content increasing, the intensity of the (003) plane enhances from Ni 0.9 Fe 0.1 CH/CC to Ni 0.7 Fe 0.3 CH/CC, meaning the crystallinity of these samples increases. [7a] Figure 1a also shows the intensity of the (113) plane enhances from Ni 0.9 Fe 0.1 CH/CC to Ni 0.7 Fe 0.3 CH/ CC.…”

Section: Resultsmentioning

confidence: 99%

“…NiFe carbonate hydroxide as an alternate to LDH system is readily available, because carbonate anions are difficult to avoid coming from CO 2 in ambient air and have high stability in LDH galleries [18] . The broad peaks marked with asterisks at around 24° and 43° are related to (002) and (100) planes of carbon cloth [19] . With Fe content increasing, the intensity of the (003) plane enhances from Ni 0.9 Fe 0.1 CH/CC to Ni 0.7 Fe 0.3 CH/CC, meaning the crystallinity of these samples increases [7a] .…”

Section: Resultsmentioning

confidence: 99%

Fe‐doped Nickel Carbonate Hydroxide Array Electrocatalysts for Enhanced Oxygen Evolution Reaction

et al. 2022

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Developing efficient and inexpensive oxygen evolution reaction (OER) electrocatalysts is crucial to address the everincreasing energy crisis and environment pollution. In this work, bimetallic nickel-iron carbonate hydroxide arrays were strongly grown on a conductive carbon cloth (NiFeCH/CC) through a facile one-step hydrothermal method, which were used as oxygen evolution reaction (OER) electrocatalysts. Ni 0.8 Fe 0.2 CH/CC requires overpotential of just 246 mV at 10 mA cm À 2 , Tafel slope of 43 mV dec À 1 , and charge transfer resistance of 3.1 Ω for OER in 1 M KOH. The catalyst also shows excellent durability by a long-term operation for 10 h. A post-OER study of Ni 0.8 Fe 0.2 CH/CC reveals that the NiFeOOH species form on the surface during OER and the carbonate ions still intercalate between the cationic layers. Benefiting from a threedimensional structure and Fe doping strategy, the performance of Ni 0.8 Fe 0.2 CH/CC has been improved. This work provides an effective strategy to design efficient OER electrocatalysts in alkaline media.

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“…is regarded as the best strategy for introducing multiactive sites. [25][26][27][28][29][30] In particular, N-doping is the most effective approach so far for preparing multiactive catalysts [23,25,31,32] owing to the versatile activity of N-atoms that comes from the geometric properties (i.e., graphitic-N, pyridinic-N, and pyrrolic-N) of the N-doped carbon catalysts. [33] The electronic nature of carbon-based materials can be tuned by doping with N-atoms, this can induce asymmetrical charge redistributions on the neighboring carbon atoms.…”

Section: Introductionmentioning

confidence: 99%

Hollow Carbon Nanoballs on Graphene as Metal‐Free Catalyst for Overall Electrochemical Water Splitting

Begum

Ahmed

Jung

2021

Adv Materials Inter

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A great deal of research effort has been dedicated for designing an efficient bifunctional metal‐free carbon catalyst for electrochemical water splitting, however, it remains challenging to introduce multiactive sites into a single catalyst. Herein, a series of bifunctional catalysts is designed that exploit intramolecular reorientation of nitrogen atom within the hollow nanoball from polyacrylonitrile on graphene through thermal treatment to achieve covalent doping. The as synthesized hollow carbon nanoballs on graphene (HCNB@G) catalysts have huge defective edges and microporous channels and contain a high density of electroactive graphitic‐N and pyridinic‐N as dual‐active sites. As a result, the optimized HCNB@G‐700 enhances electrocatalytic activities for both oxygen evolution and hydrogen evolution reactions (OER and HER) in 1.0 m KOH by generating 217 and 108 mV overpotential to gain a current density of 10 mA cm−2, respectively. This remarkable electrocatalytic activity mainly originates from the appropriate combination of suitable nitrogen active sites and edge defects with microchannels that not only facilitate the penetration of electrolyte but also improve the stability of the HCNB@G. In addition, the superior conductivity and high surface area of HCNB@G boost electrocatalytic activity by supporting efficient charge transport and enabling rapid mass diffusion with gas release, respectively.

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Carbon Cloth Supported Nitrogen Doped Porous Carbon Wrapped Co Nanoparticles for Effective Overall Water Splitting

Cited by 10 publications

References 55 publications

Integrated Bifunctional Electrodes Based on Amorphous Co–Ni–S Nanoflake Arrays with Atomic Dispersity of Active Sites for Overall Water Splitting

Integrated Bifunctional Electrodes Based on Amorphous Co–Ni–S Nanoflake Arrays with Atomic Dispersity of Active Sites for Overall Water Splitting

Fe‐doped Nickel Carbonate Hydroxide Array Electrocatalysts for Enhanced Oxygen Evolution Reaction

Hollow Carbon Nanoballs on Graphene as Metal‐Free Catalyst for Overall Electrochemical Water Splitting

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