Optimization of oxygen evolution activity by tuning e*g band broadening in nickel oxyhydroxide

Zhong, Haoyin; Wang, Xiaopeng; Sun, Guangxin; Tang, Yawen; Tan, Shengdong; He, Qian; Zhang, Jun; Xiong, Tao; Diao, Caozheng; Yu, Zhi Gen; Lee, Wee Siang Vincent; Xue, Junmin

doi:10.1039/d2ee03413a

Cited by 63 publications

(68 citation statements)

References 46 publications

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“…Recently, we thoroughly analyzed the structure difference of reconstructionderived X-Ni(OH) 2 (X = NiS 2 , NiSe 2 , and Ni 5 P 4 ). [16] FT-EXAFS showed that the fitted Ni-O bond distances were 2.03916 Å, . This result proved that a higher extent of strain would lead to the stronger e g * band broadening around the Fermi level.…”

Section: Density Functional Theory Calculationsmentioning

confidence: 96%

Fundamental Understanding of Structural Reconstruction Behaviors in Oxygen Evolution Reaction Electrocatalysts

Zhong,

Zhang,

et al. 2023

Advanced Energy Materials

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Transition metal‐based oxyhydroxides (MOOH) derived from the irreversible structural reconstruction of precatalysts are often acknowledged as the real catalytic species for the oxygen evolution reaction (OER). Typically, the reconstruction‐derived MOOH would exhibit superior OER activity compared to their directly synthesized counterparts, despite being fundamentally similar in chemistry. As such, structural reconstruction has emerged as a promising strategy to boost the catalytic activity of electrocatalysts. However, the in‐depth understanding of the origin of the superior OER activity of reconstructed materials still remains ambiguous, which significantly hinders the further developments of highly efficient electrocatalysts based on structural reconstruction chemistry. In this review, a comprehensive overview of the structural reconstruction behaviors in the reported reconstruction‐derived electrocatalysts is provided and the intrinsic chemical and structural origins of their high efficiency toward OER are unveiled. The fundamentals of structural reconstruction mechanisms, along with the recommended characterization techniques for the understanding of the dynamic structural reconstruction process and analyzing the structure of real catalytic species are also interpreted. Finally, in view of structural reconstruction chemistry, the potential perspectives to facilitate the design and synthesis of highly efficient and durable OER electrocatalyst are presented.

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Section: Density Functional Theory Calculationsmentioning

confidence: 96%

Fundamental Understanding of Structural Reconstruction Behaviors in Oxygen Evolution Reaction Electrocatalysts

Zhong,

Zhang,

et al. 2023

Advanced Energy Materials

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“…Recently, Zhong et al also noticed this phenomenon in typical Ni-based pre-catalysts, including NiS 2 , NiSe 2 , and Ni 5 P 4 , which exhibit differentiated oxygen evolution activities. 111 For NiS 2 , NiSe 2 , and Ni 5 P 4 , different extents of strain were observed in these reconstructed NiOOH. A stronger strain leads to a greater NiO 6 octahedron distortion in NiOOH, which broadens the e g band and thus enhances the catalytic performance.…”

Section: Surface Engineeringmentioning

confidence: 86%

Surface and near-surface engineering design of transition metal catalysts for promoting water splitting

et al. 2023

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“…In addition, the weakening of the peak area of the S–O bond and the shifts of S 2p 1/2 and S 2p 3/2 (Figure f) are closely related to the oxidation of the metal species during the catalytic process. In common, metal sulfides prefer to undergo structural reconfiguration during OER, forming hydroxides. − The Raman spectrum of FeOOH/Co 9 S 8 /Ni 3 S 2 after the OER test further confirmed the existence of the hydroxide layer. For the activated FeOOH/Co 9 S 8 /Ni 3 S 2 electrode, the Raman band at 486 cm –1 is attributed to the CoOOH stretching vibration, while the band at 548 cm –1 is assigned to NiOOH (Figure S14).…”

mentioning

confidence: 85%

Rational Design of Goethite-Sulfide Nanowire Heterojunctions for High Current Density Water Splitting

Qian

Zhou

Zhang

et al. 2023

J. Phys. Chem. Lett.

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The preparation of efficient and stable bifunctional electrocatalysts for electrochemical overall water splitting (OWS) to scale up commercial hydrogen production remains a great challenge. Here, we synthesized heterojunction structures consisting of Co9S8/Ni3S2 nanowire arrays and amorphous goethite (FeOOH, α-phase) particles as efficient OWS catalysts using an interface engineering strategy. The interfacial charge inhomogeneity caused by the heterojunction contact leads to the generation of a built-in electric field, which makes the electron-deficient FeOOH and electron-rich Co9S8/Ni3S2 favorable for hydrogen/oxygen evolution reaction, respectively, thus ensuring the excellent activity of FeOOH/Co9S8/Ni3S2 as a bifunctional catalyst. FeOOH/Co9S8/Ni3S2 exhibits impressive catalytic activity for the oxygen evolution reaction, achieving an ultralarge current density of 1000 mA cm–2 needed as low as 265 mV overpotential, and its stability was tested up to 1440 h. Furthermore, an excellent OWS output (1.55 V to generate 10 mA cm–2) is achieved by the bifunctional FeOOH/Co9S8/Ni3S2 catalysts.

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Optimization of oxygen evolution activity by tuning e*g band broadening in nickel oxyhydroxide

Abstract: Nickel oxyhydroxides (NiOOH) derived from the reconstruction of Ni-based pre-catalysts are the active species for oxygen evolution reaction (OER). Although chemically similar, these NiOOH exhibited differentiated OER activities that show...

Cited by 63 publications

References 46 publications

Fundamental Understanding of Structural Reconstruction Behaviors in Oxygen Evolution Reaction Electrocatalysts

Fundamental Understanding of Structural Reconstruction Behaviors in Oxygen Evolution Reaction Electrocatalysts

Surface and near-surface engineering design of transition metal catalysts for promoting water splitting

Rational Design of Goethite-Sulfide Nanowire Heterojunctions for High Current Density Water Splitting

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