Construction of MnO2/Monolayer g-C3N4 with Mn vacancies for Z-scheme overall water splitting

Mo, Zhishen; Xu, Hui; Chen, Zhigang; She, Xiaojie; Song, Yanhua; Lian, Jiabiao; Zhu, Xingwang; Yan, Pengfei; Lei, Yucheng; Yuan, Shouqi; Li, Huaming

doi:10.1016/j.apcatb.2018.08.073

Cited by 265 publications

(85 citation statements)

References 66 publications

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“…Similarly, Fe 2p peaks with a satellite peak were fitted with the peaks of Fe 3+ in oxidized iron species (Figure 2d). 27 In the O 1s spectrum (Figure 2e), the peaks at 530.0 and 531.3 eV were attributed to O 2− and –OH in the oxidized manganese species 28. The increased OH peak intensity in Ni‐Fe‐K 0.23 MnO 2 CNFs‐300 was related to the formation and increase of active (oxy)hydroxides and oxygen vacancies, possibly due to the coaction of the annealing process and doping effect 13,29.…”

Section: Resultsmentioning

confidence: 97%

Construction of Defect‐Rich Ni‐Fe‐Doped K_0.23MnO₂ Cubic Nanoflowers via Etching Prussian Blue Analogue for Efficient Overall Water Splitting

Liao

Guo

Hou

et al. 2020

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Designing elaborate nanostructures and engineering defects have been promising approaches to fabricate cost‐efficient electrocatalysts toward overall water splitting. In this work, a controllable Prussian‐blue‐analogue‐sacrificed strategy followed by an annealing process to harvest defect‐rich Ni‐Fe‐doped K0.23MnO2 cubic nanoflowers (Ni‐Fe‐K0.23MnO2 CNFs‐300) as highly active bifunctional catalysts for oxygen and hydrogen evolution reactions (OER and HER) is reported. Benefiting from many merits, including unique morphology, abundant defects, and doping effect, Ni‐Fe‐K0.23MnO2 CNFs‐300 shows the best electrocatalytic performances among currently reported Mn oxide‐based electrocatalysts. This catalyst affords low overpotentials of 270 (320) mV at 10 (100) mA cm−2 for OER with a small Tafel slope of 42.3 mV dec−1, while requiring overpotentials of 116 and 243 mV to attain 10 and 100 mA cm−2 for HER respectively. Moreover, Ni‐Fe‐K0.23MnO2 CNFs‐300 applied to overall water splitting exhibits a low cell voltage of 1.62 V at 10 mA cm−2 and excellent durability, even superior to the Pt/C||IrO2 cell at large current density. Density functional theory calculations further confirm that doping Ni and Fe into the crystal lattice of δ‐MnO2 can not only reinforce the conductivity but also reduces the adsorption free‐energy barriers on the active sites during OER and HER.

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Section: Resultsmentioning

confidence: 97%

Construction of Defect‐Rich Ni‐Fe‐Doped K_0.23MnO₂ Cubic Nanoflowers via Etching Prussian Blue Analogue for Efficient Overall Water Splitting

Liao

Guo

Hou

et al. 2020

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“…A 1D nanocatalyst, MnO 2 nanorods (MnO 2 -NRs), was synthesized for HMF partial oxidation to DFF at ambient conditions; [60] 98 % DFF yield was attained in acetonitrile as solvent under UV light, at 39°C in 4 h. MnO 2 has a lower covalence band potential [61] suggesting that the charge transfer follows the Mn 4 + /Mn 3 + redox cycle during the catalytic transformation. The mild heat and LED light promoted the activation of NRs lattice oxygens and increased the outer surface temperature, thus leading to the adsorption of HMF via the CÀ OH moiety on the O À sites (deprotonated Brønsted sites) [60,62] with the simultaneous formation of transient alkoxy intermediate.…”

Section: Photocatalytic Oxidation Of Hmfmentioning

confidence: 99%

Innovative Protocols in the Catalytic Oxidation of 5‐Hydroxymethylfurfural

Zhao

Wang

et al. 2020

ChemSusChem

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5-Hydroxymethylfurfural (HMF) has been identified as one of the most promising biomass-based multipurpose platform molecules. Innovative protocols, namely electrocatalysis, photocatalysis, and microwave (MW)-assisted chemistry, as well as continuous-flow systems, add a new dimension and another promising toolbox for the oxidation of HMF in recent years. This Minireview deals with recent progress in the catalytic oxidation of HMF to 2,5-furandicarboxylic acid (FDCA) and other intermediates using noble, non-noble, and metal-free systems deploying emerging protocols. Selective HMF downstream oxidation products could be obtained not only via common catalyst modifications, namely nature of the metal, preparative method, and the property of deployed support, but also by using innovative processes.

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“…To satisfy the requirement of CB and VB position for overall water splitting, constructing heterojunction photocatalytic systems have always been applied. [ 190–192 ] For example, combining the thin‐layered BiVO 4 , Ru‐SrTiO 3 :Rh and Fe 2+ /Fe 3+ , Dong et al successfully constructed a Z‐scheme heterostructured photocatalytic system. In this system, the Fe 2+ /Fe 3+ plays the role of redox mediator, which can facilitate the charge carries migration and separation.…”

Section: Photocatalytic Applicationsmentioning

confidence: 99%

Thin‐Layered Photocatalysts

Sun

Huang

Zhao

et al. 2020

Adv Funct Materials

132

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Semiconductor photocatalysis, a green and sustainable technology, is of great significance for solving environmental pollution and energy shortages. However, the common problems of inefficient light harvesting, rapid recombination of electron-hole pairs, and low surface reactive reaction sites for photocatalysts urgently need to be solved. In this regard, thin-layered photocatalysts are considered to be one of the most promising candidates for addressing these issues, due to their unique surface and electronic properties. In this review, the various strategies for constructing thin-layered photocatalysts are summarized, and emphasis is given to approaches for optimizing the photocatalytic performance of the thin-layered materials, which can be classified into surface engineering and junction construction. In addition, the photocatalytic applications of thin-layered materials, i.e., water splitting, CO 2 reduction, nitrogen fixation, and molecule oxygen activation, are summarized. Finally, based on current achievements in thin-layered photocatalysts, their future development and challenges are discussed.

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Construction of MnO2/Monolayer g-C3N4 with Mn vacancies for Z-scheme overall water splitting

Cited by 265 publications

References 66 publications

Construction of Defect‐Rich Ni‐Fe‐Doped K_0.23MnO₂ Cubic Nanoflowers via Etching Prussian Blue Analogue for Efficient Overall Water Splitting

Construction of Defect‐Rich Ni‐Fe‐Doped K_0.23MnO₂ Cubic Nanoflowers via Etching Prussian Blue Analogue for Efficient Overall Water Splitting

Innovative Protocols in the Catalytic Oxidation of 5‐Hydroxymethylfurfural

Thin‐Layered Photocatalysts

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Construction of MnO2/Monolayer g-C3N4 with Mn vacancies for Z-scheme overall water splitting

Cited by 265 publications

References 66 publications

Construction of Defect‐Rich Ni‐Fe‐Doped K0.23MnO2 Cubic Nanoflowers via Etching Prussian Blue Analogue for Efficient Overall Water Splitting

Construction of Defect‐Rich Ni‐Fe‐Doped K0.23MnO2 Cubic Nanoflowers via Etching Prussian Blue Analogue for Efficient Overall Water Splitting

Innovative Protocols in the Catalytic Oxidation of 5‐Hydroxymethylfurfural

Thin‐Layered Photocatalysts

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Product

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Construction of Defect‐Rich Ni‐Fe‐Doped K_0.23MnO₂ Cubic Nanoflowers via Etching Prussian Blue Analogue for Efficient Overall Water Splitting

Construction of Defect‐Rich Ni‐Fe‐Doped K_0.23MnO₂ Cubic Nanoflowers via Etching Prussian Blue Analogue for Efficient Overall Water Splitting