Au/Ni/Ni(OH)2/C Nanocatalyst with High Catalytic Activity and Selectivity for m-dinitrobenzene Hydrogenation

Ruan, Luna; Fu, Huan; Liao, Jianhua; Ding, Nengwen; Lan, Junjie; Yang, Kai; Rong, Mengke; Zhao, Ning; Zhu, Lihua; Chen, Bing Hui

doi:10.1007/s10562-021-03630-8

Cited by 4 publications

(2 citation statements)

References 46 publications

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“…The two peaks at 84.0 eV (Au 4f 7/2) and 87.7 eV (Au 4f 7/2) suggest the presence of Au (Figure S2b). , As shown in Figure g, the peaks located at 853.8 and 855.5 eV in the Ni 2p spectrum can be assigned to NiO and Ni(OH) 2 , whereas the peak at 856.6 eV indicates that Ni was partially oxidized to a higher valence state, i.e., the presence of Ni III/IV OOH in the Au/NiOOH heterojunctions. , As a comparison, the XPS peaks in E-Ni(OH) 2 @Ni foam only showed the existence of Ni 0 , NiO, and Ni(OH) 2 . Interestingly, NiOOH is generally believed to be derived under high oxidation potential and strong alkaline conditions, acting as the active species for Ni-based OER. − Therefore, the promoted formation and stabilization of Au/Ni III/IV OOH even under ambient conditions could presumably boost its MOR activity by increasing the surface abundance of active NiOOH species.…”

Section: Resultsmentioning

confidence: 96%

“…The two peaks at 84.0 eV (Au 4f 7/2) and 87.7 eV (Au 4f 7/2) suggest the presence of Au (Figure S2b). 53,54 As shown in Figure 1g, the peaks located at 853.8 and 855.5 eV in the Ni 2p spectrum can be assigned to NiO and Ni(OH) 2 , 55 whereas the peak at 856.6 eV indicates that Ni was partially oxidized to a higher valence state, i.e., the presence of Ni III/IV OOH in the Au/NiOOH heterojunctions. 56,57 As a comparison, the XPS peaks in E-Ni(OH) 2 @Ni foam only showed the existence of Ni 0 , NiO, and Ni(OH) 2 .…”

Section: Catalyst Preparation and Characterizationmentioning

confidence: 99%

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Ampere-Level Electrolytic Coproduction of Formate with Coupled Carbon Dioxide Reduction and Selective Methanol Oxidation

Liu,

Tian,

et al. 2024

ACS Catal.

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The electrocatalytic oxidation of small organic molecules presents a compelling approach for environmentally friendly and value-added chemical production, especially when coupled with high-efficiency carbon dioxide reduction. However, significant challenges persist in achieving industrial-scale current densities while ensuring optimal selectivity, activity, and cycle stability of the electrocatalyst. Here, we report the high performance of the Au/NiOOH@Ni heterojunction foam electrode in selective methanol oxidation, which efficiently pairs with cathodic carbon dioxide reduction to reach ampere-level coelectrolytic production of formate. The Au/NiOOH@Ni foam demonstrated ∼100% Faraday efficiency in the high current density range of 200−1200 mA/cm 2 during half-cell methanol oxidation, and a total FE formate exceeding 180% was achieved under 1.20 A/cm 2 using a coelectrolytic flow cell. In situ mechanistic investigations and theoretical calculations revealed that Au/NiOOH heterojunctions promote the formation and stabilization of high-valence active Ni III/IV OOH under both as-prepared and operando conditions through the interfacial Ni IV -O*-Au structure, which continuously provides abundant active sites and oxygen sources (from partial water oxidation) for methanol-to-formate conversion while constructing a stable and efficient catalytic environment.

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