Elucidating the electro-catalytic oxidation of hydrazine over carbon nanotube-based transition metal single atom catalysts

Zhang, Jin; Wang, Yaxin; Yang, Chujie; Chen, Sian; Li, Zheng Jian; Cheng, Yi; Wang, Haining; Xiang, Yan; Lu, Shanfu; Wang, Shuangyin

doi:10.1007/s12274-021-3397-9

Cited by 31 publications

(16 citation statements)

References 66 publications

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“…DFT calculations further identify the most likely catalytic sites in molecular detail. Based on these findings, we now reveal that the 'double wave' phenomenon, often observed in HzOR electrocatalysis on carbon-based materials, 19,22,28,33,42,[59][60][61][62][63] is due to the secondary yet powerful contribution of undoped carbon sites. Overall, the carbon matrix is found to play a larger role in hydrazine oxidation electrocatalysis than previously assumed.…”

Section: Introductionmentioning

confidence: 63%

“…Many doped carbons studied as HzOR electrocatalysts show a puzzling voltammetric signature in alkaline, consisting of two oxidation waves. 19,22,28,33,42,[59][60][61][62][63] While the first wave is correlated with the introduction of specific dopants (e.g. Fe or N), the second wave remains a topic of debate.…”

Section: Explaining the 'Double Peak' Phenomenon In Hzor On Carbonmentioning

confidence: 99%

“…In fact, each of these components has been claimed to contribute to electrocatalytic activity. The leading candidates for HzOR active sites are atomically dispersed M-N x moieties, [33][34][35][36][37][38] followed by metal-free N dopants. [39][40][41][42][43][44][45] The role of inorganic particles (such as iron carbides) was heavily debated; recently, we proved that Fe 3 C is inactive towards the HzOR.…”

Section: Introductionmentioning

confidence: 99%

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Understanding hydrazine oxidation electrocatalysis on undoped carbon

Burshtein

Tamakuwala

Sananis

et al. 2022

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 63%

Section: Explaining the 'Double Peak' Phenomenon In Hzor On Carbonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Understanding hydrazine oxidation electrocatalysis on undoped carbon

Burshtein

Tamakuwala

Sananis

et al. 2022

Phys. Chem. Chem. Phys.

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“…Electrochemical HzOR is a four-electron transfer process, ,, and the reaction mechanism can be represented by the following equation …”

Section: Results and Discussionmentioning

confidence: 99%

Enhanced Hydrazine Oxidation on Histidine-Functionalized Graphene-Based Electrocatalysts

2022

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One of the most essential processes in industrial and other potential energy applications is the electrochemical hydrazine oxidation reaction (HzOR). With an onset potential of 0.75 V versus reversible hydrogen electrode (RHE), the electrochemical HzOR performance of histidine-functionalized graphene oxide (Hist@rGO) is substantially enhanced with an achieved higher current of 24 mA/cm 2 at 1.95 V versus RHE in 0.5 M KOH. Hist@rGO has the highest electrocatalytic performance for hydrazine oxidation processes according to electrochemical measurements. Moreover, the Hist@ rGO-supported material performs admirably that may be attributed to its synergistic catalytic activity. The presence of an imidazole ring containing heteroatoms on the top of GO boosts the electrocatalytic activity and electron-transfer capacities toward the HzOR, resulting in outstanding electrochemical HzOR performance for the Hist@rGO electrocatalyst. The size of Hist@rGO is confirmed by morphological studies using high-resolution transmission electron microscopy. From the binding energies of C−N, C−O, and C−C signals, X-ray photoelectron spectroscopy validates the surface modification of GO by histidine (Hist@rGO). According to our data, the metal-free amino acid-functionalized carbon-based electrocatalyst has an excellent electrochemical HzOR performance and plays an important role in activity.

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“…Therefore, it is vital to fabricate highly active, viable, and low-cost anode catalysts with a low overpotential for the demonstration of direct hydrazine fuel cells for different applications. In recent times, supported non-noble metal catalysts have been effectively prepared, and have progressively replaced the customary fuel cell catalysts that contain noble (precious) metals and their corresponding metal alloys in the electrooxidation reaction of hydrazine [29][30][31][32][33][34][35][36]. For instance, Duan and co-workers established a novel type of bendable electrode that was constructed using Cu nanocubes that were inserted into graphene paper via a simple electro-deposition process.…”

Section: Introductionmentioning

confidence: 99%

Co Nanoparticle-Encapsulated Nitrogen-Doped Carbon Nanotubes as an Efficient and Robust Catalyst for Electro-Oxidation of Hydrazine

et al. 2021

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Structural engineering is an effective methodology for the tailoring of the quantities of active sites in nanostructured materials for fuel cell applications. In the present study, Co nanoparticles were incorporated into the network of 3D nitrogen-doped carbon tubes (Co@NCNTs) that were obtained via the molten-salt synthetic approach at 800 °C. Morphological representation reveals that the Co@NCNTs are encompassed with Co nanoparticles on the surface of the mesoporous walls of the carbon nanotubes, which offers a significant active surface area for electrochemical reactions. The CoNPs/NCNTs-1 (treated with CaCl2) nanomaterial was used as a potential candidate for the electro-oxidation of hydrazine, which improved the response of hydrazine (~8.5 mA) in 1.0 M NaOH, as compared with CoNPs/NCNTs-2 (treated without CaCl2), NCNTs, and the unmodified GCE. Furthermore, the integration of Co helps to improve the conductivity and promote the lower onset electro-oxidation potential (−0.58 V) toward the hydrazine electro-oxidation reaction. In particular, the CoNPs/NCNTs-1 catalysts showed significant catalytic activity and stability performances i.e., the i-t curves showed notable stability when compared with their initial current responses, even after 10 days, which indicates the significant durability of the catalyst materials. This work could present a new approach for the design of efficient electrode materials, which can be used as a favorable candidate for the electro-oxidation of liquid fuels in fuel cell applications.

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Elucidating the electro-catalytic oxidation of hydrazine over carbon nanotube-based transition metal single atom catalysts

Cited by 31 publications

References 66 publications

Understanding hydrazine oxidation electrocatalysis on undoped carbon

Understanding hydrazine oxidation electrocatalysis on undoped carbon

Enhanced Hydrazine Oxidation on Histidine-Functionalized Graphene-Based Electrocatalysts

Co Nanoparticle-Encapsulated Nitrogen-Doped Carbon Nanotubes as an Efficient and Robust Catalyst for Electro-Oxidation of Hydrazine

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