Iridium in Tungsten Trioxide Matrix as an Efficient Bi‐Functional Electrocatalyst for Overall Water Splitting in Acidic Media

Li, Pengsong; Duan, Xiaoyong; Kuang, Yun; Sun, Xiaoming

doi:10.1002/smll.202102078

Cited by 38 publications

(20 citation statements)

References 50 publications

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“…Notably, the water-splitting performance of our designed Co 4 N@NC catalytic system is significantly superior to that of previously reported electrocatalysts (Fig. 8d) [40][41][42][43][44][45][46][47][48][49][50]. In addition, the Faradaic current efficiency demonstrates that the selectivity of Co 4 N@NC for H 2 and O 2 is nearly 100% (Fig.…”

Section: Electrocatalytic Overall Water Splittingmentioning

confidence: 51%

Space-confined ultrafine Co4N nanodots within an N-doped carbon framework on carbon cloth for highly efficient universal pH overall water splitting

et al. 2023

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Electrocatalysts with high efficiency and stability for water splitting over a broad pH range are highly desirable but difficult to synthesize. Herein, we synthesized ultrafine Co 4 N nanodots anchored to the surface of an N-doped carbon framework (Co 4 N@NC) via a new space-restricted strategy. The key to this method is the design of a task-specific deep eutectic solvent precursor, which ultimately forms ultrafine Co 4 N nanodots that are anchored to the surface of NC framework by hydrogen bonding interactions between the components. The formation of a new Co-C bond at the interface of Co 4 N@NC expedites the electron transfer and optimizes the adsorption/desorption energies. Co 4 N@NC demonstrates excellent electrocatalytic water splitting activity at all pH values, requiring only 1.47 (0.5 mol L −1 H 2 SO 4 ), 1.48 (1.0 mol L −1 KOH), and 1.61 V (1.0 mol L −1 PBS) to reach 10 mA cm −2 current density. This study provides theoretical guidance for the systematic design of electrocatalysts with excellent stability in various electrolytes.

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Section: Electrocatalytic Overall Water Splittingmentioning

confidence: 51%

Space-confined ultrafine Co4N nanodots within an N-doped carbon framework on carbon cloth for highly efficient universal pH overall water splitting

et al. 2023

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“…[17] The 2D OER performance diagram with overpotential and Tafel slope as x and y axis (Figure 2c) were summarized for Y 2 Ru 1.2 Ir 0.8 O 7 and recently reported noble-metal catalysts. [2,12,13,27,[33][34][35][36][37][38][39][40] The Y 2 Ru 1.2 Ir 0.8 O 7 catalyst is located at the bottom left corner, suggesting both high activity and fast OER kinetics.…”

Section: Oer Performancementioning

confidence: 99%

Iridium Doped Pyrochlore Ruthenates for Efficient and Durable Electrocatalytic Oxygen Evolution in Acidic Media

Liu

Zhang

et al. 2022

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Developing highly active, durable, and cost‐effective electrocatalysts for the oxygen evolution reaction (OER) is of prime importance in proton exchange membrane (PEM) water electrolysis techniques. Ru‐based catalysts have high activities but always suffer from severe fading and dissolution issues, which cannot satisfy the stability demand of PEM. Herein, a series of iridium‐doped yttrium ruthenates pyrochlore catalysts is developed, which exhibit better activity and much higher durability than commercial RuO2, IrO2, and most of the reported Ru or Ir‐based OER electrocatalysts. Typically, the representative Y2Ru1.2Ir0.8O7 OER catalyst demands a low overpotential of 220 mV to achieve 10 mA cm−2, which is much lower than that of RuO2 (300 mV) and IrO2 (350 mV). In addition, the catalyst does not show obvious performance decay or structural degradation over a 2000 h stability test. EXAFS and XPS co‐prove the reduced valence state of ruthenium and iridium in pyrochlore contributes to the improved activity and stability. Density functional theory reveals that the potential‐determining steps barrier of OOH* formation is greatly depressed through the synergy effect of Ir and Ru sites by balancing the d band center and oxygen intermediates binding ability.

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“…By confining Ir sites in the WO 3 matrix (Ir-doped WO 3 ), Li et al established a strong electronic interaction between active metal centers and the support, which inhibited the formation of soluble high valence state IrO x species and thus contributed to exceptional stability with only 16 mV decay after 60 h continuous electrolysis under 100 mA cm −2 . [70] Likewise, Bajdich and coworkers synthesized and evaluated WO 3 particles with ≈6.3 atom % Ir loading (Ir:WO 3 /Ir) (Figure 6f), which exhibited an enhanced activity for acidic OER while maintained the robust electrochemical stability of WO 3 support. [71] The exceptional catalyst was operated at 10 mA cm −2 for more than a month with only 0.1% overpotential decay.…”

Section: Support Effectmentioning

confidence: 99%

Oxygen Evolution Electrocatalysts for the Proton Exchange Membrane Electrolyzer: Challenges on Stability

Lin

Lou

Ding³

et al. 2022

Small Methods

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Hydrogen generated by proton exchange membrane (PEM) electrolyzer holds a promising potential to complement the traditional energy structure and achieve the global target of carbon neutrality for its efficient, clean, and sustainable nature. The acidic oxygen evolution reaction (OER), owing to its sluggish kinetic process, remains a bottleneck that dominates the efficiency of overall water splitting. Over the past few decades, tremendous efforts have been devoted to exploring OER activity, whereas most show unsatisfying stability to meet the demand for industrial application of PEM electrolyzer. In this review, systematic considerations of the origin and strategies based on OER stability challenges are focused on. Intrinsic deactivation of the material and the extrinsic balance of plant‐induced destabilization are summarized. Accordingly, rational strategies for catalyst design including doping and leaching, support effect, coordination effect, strain engineering, phase and facet engineering are discussed for their contribution to the promoted OER stability. Moreover, advanced in situ/operando characterization techniques are put forward to shed light on the OER pathways as well as the structural evolution of the OER catalyst, giving insight into the deactivation mechanisms. Finally, outlooks toward future efforts on the development of long‐term and practical electrocatalysts for the PEM electrolyzer are provided.

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Iridium in Tungsten Trioxide Matrix as an Efficient Bi‐Functional Electrocatalyst for Overall Water Splitting in Acidic Media

Abstract: During structure optimization, all energy change criterion was set to 10 −4 eV, the atoms were relaxed until the force acting on each atom was less than 0.02 eV Å −1 , the plane wave cutoff was set to 450 eV, and the van der Waals (vdW) correction was considered in the modeling.

Cited by 38 publications

References 50 publications

Space-confined ultrafine Co4N nanodots within an N-doped carbon framework on carbon cloth for highly efficient universal pH overall water splitting

Space-confined ultrafine Co4N nanodots within an N-doped carbon framework on carbon cloth for highly efficient universal pH overall water splitting

Iridium Doped Pyrochlore Ruthenates for Efficient and Durable Electrocatalytic Oxygen Evolution in Acidic Media

Oxygen Evolution Electrocatalysts for the Proton Exchange Membrane Electrolyzer: Challenges on Stability

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