Single‐Atom Molybdenum Engineered Platinum Nanocatalyst for Boosted Alkaline Hydrogen Oxidation

Ma, Min; Li, Guang; Yan, Wei; Wu, Zhuangzhuang; Zheng, Zhiping; Zhang, Xibo; Wang, Qiuxiang; Du, Guifen; Liu, Deyu; Xie, Zhaoxiong; Kuang, Qin; Zheng, Lan‐Sun

doi:10.1002/aenm.202103336

Cited by 82 publications

(47 citation statements)

References 65 publications

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“…In the X-ray absorption near edge structure (XANES) in Figure 1d, the normalized Mo K-edge absorption energy profile and the white line intensity of Mo SA-N/C located between those of Mo foil and MoO 3 references, revealing that the valence state of Mo in Mo SA-N/C was between Mo 0 and Mo 6+ . [43,44] The main peak of Mo SA-N/C at 1.3 Å in Fourier transform extended XAFS corresponded to the first shell scattering of MoN or MoC bond rather than MoMo bond at 2.4 Å or MoO bond at 1.1 and 1.7 Å (Figure 1e). Quantitative extended XAFS fitting was conducted, with the fitting results presented in Figure 1f and Figure S5 (Supporting Information) and the fitting parameters provided in Table S2 (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Photothermal‐Amplified Single Atom Nanozyme for Biofouling Control in Seawater

Wang

Luo

et al. 2022

Adv Funct Materials

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Biofouling is a common and expensive problem in medical, food, and maritime industries. Artificial nanozymes as functional mimics of haloperoxidases that boost the formation of cytotoxic hypohalous acids from halides and H2O2 are showing increasing potential as a novel class of ecofriendly antibiofouling materials to combat biofilm formation. A photothermal nanozyme (Mo SA‐N/C) with Mo single atoms as active sites that exhibits haloperoxidase‐mimicking capacity is herein developed. Density functional theory calculations indicate that hydroxyl radical from H2O2 dissociation is the key intermediate for hypobromous acid formation. Upon photoirradiation, Mo SA‐N/C generates heat and accelerates the reaction kinetics substantially. Finally, it is demonstrated that Mo SA‐N/C exerts superior broad‐spectrum antibacterial activity and can be applied as an effective coating additive for inhibiting biofouling in real marine conditions. Taken together, this study opens an avenue for developing biocompatible and photo‐response artificial enzymes for our fight against marine biofouling.

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Section: Resultsmentioning

confidence: 99%

Photothermal‐Amplified Single Atom Nanozyme for Biofouling Control in Seawater

Wang

Luo

et al. 2022

Adv Funct Materials

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“…For example, Ma et al . performed SEIRAS analysis on Mo–Pt/NC . The weakened intrinsic HBE together with Mo-induced enhanced water adsorption resulted in an optimized HBE app of Mo–Pt/NC, endowing it with better activity than Pt/NC.…”

Section: Constructing Suitable Models Of Catalyst Surface and Interfa...mentioning

confidence: 99%

“…For example, Ma et al performed SEIRAS analysis on Mo−Pt/NC. 194 The weakened intrinsic HBE together with Mo-induced enhanced water adsorption resulted in an optimized HBE app of Mo−Pt/NC, endowing it with better activity than Pt/NC. Therefore, as an important element of HOR activity descriptors, the solvent effect is crucial to be included in computational modeling.…”

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confidence: 99%

Electrocatalytic Hydrogen Oxidation in Alkaline Media: From Mechanistic Insights to Catalyst Design

et al. 2022

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With the potential to circumvent the need for scarce and cost-prohibitive platinum-based catalysts in proton-exchange membrane fuel cells, anion-exchange membrane fuel cells (AEMFCs) are emerging as alternative technologies with zero carbon emission. Numerous noble metal-free catalysts have been developed with excellent catalytic performance for cathodic oxygen reduction reaction in AEMFCs. However, the anodic catalysts for hydrogen oxidation reaction (HOR) still rely on noble metal materials. Since the kinetics of HOR in alkaline media is 2–3 orders of magnitude lower than that in acidic media, it is a major challenge to either improve the performance of noble metal catalysts or to develop high-performance noble metal-free catalysts. Additionally, the mechanisms of alkaline HOR are not yet clear and still under debate, further hampering the design of electrocatalysts. Against this backdrop, this review starts with the prevailing theories for alkaline HOR on the basis of diverse activity descriptors, i.e., hydrogen binding energy theory and bifunctional theory. The design principles and recent advances of HOR catalysts employing the aforementioned theories are then summarized. Next, the strategies and recent progress in improving the antioxidation capability of HOR catalysts, a thorny issue which has not received sufficient attention, are discussed. Moreover, the significance of correlating computational models with real catalyst structure and the electrode/electrolyte interface is further emphasized. Lastly, the remaining controversies about the alkaline HOR mechanisms as well as the challenges and possible research directions in this field are presented.

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“…1–5 Indeed, some transition metal-based materials have been proven to activate oxygen reduction comparable to the commercial Pt/C for the AEMFC cathode. 6–9 But, for the AEMFC anode, it should be noted that the hydrogen oxidation reaction (HOR) kinetic rate of Pt in alkaline media is about two to three orders of magnitude slower than that in acidic electrolyte, 10–12 which consequently requires much higher Pt loading. 13,14 Therefore, it is imperative to design Pt-free and efficient HOR catalysts under alkaline conditions to realize the implementation of AEMFCs.…”

mentioning

confidence: 99%