Electronic modulation of cobalt phosphide nanosheet arrays via copper doping for highly efficient neutral-pH overall water splitting

Liang, Yan; Zhang, Bing; Zhu, Junlu; Li, Yunyong; Tsiakaras, Panagiotis; Shen, Pei Kang

doi:10.1016/j.apcatb.2019.118555

Cited by 195 publications

(96 citation statements)

References 59 publications

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“…The other two peaks at 129.2 and 130.2 eV can be indexed to the P-Co and P-Ni species in CoNiP x , which agree well with the 777.7 eV in Co 2p and 852.6 eV in Ni 2p, respectively[22,43,45,46]. The C 1s peaks at 288.…”

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confidence: 73%

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Hollow cobalt-nickel phosphide nanocages for efficient electrochemical overall water splitting

et al. 2020

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A low-cost, highly efficient and strong durable bifunctional electrocatalyst is crucial for electrochemical overall water splitting. In this paper, a self-templated strategy combined with in-situ phosphorization is applied to construct hollow structured bimetallic cobalt-nickel phosphide (CoN-iP x) nanocages. Owing to their unique hollow structure and bimetallic synergistic effects, the as-synthesized CoNiP x hollow nanocages exhibit a high electrocatalytic activity and stability towards hydrogen evolution reaction in all-pH electrolyte and a remarkable electrochemical performance for oxygen evolution reaction in 1.0 mol L −1 KOH. Meanwhile, with the bifunctional electrocatalyst in both anode and cathode for overall water splitting, a low voltage of 1.61 V and superior stability are achieved at a current density of 20 mA cm −2 .

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confidence: 73%

“…In addition, the peak at 777.7 eV (Fig. 2b) is attributed to the Co-P bond [22,43,45,46]. Similarly, in the high-resolution Ni 2p XPS spectrum (Fig.…”

Section: Resultsmentioning

confidence: 79%

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Hollow cobalt-nickel phosphide nanocages for efficient electrochemical overall water splitting

et al. 2020

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“…CoP doped with Cu shows greatly enhanced intrinsic activity and conductivity compared with pristine CoP. [ 233 ] Cu‐CoP is transformed into Cu‐CoOOH during OER and acts as the real active sites. DFT calculations show a remarkable decrease in the energy barrier for *O formation on Cu‐CoOOH, which effectively reduces the energy barrier of RDS and in turn facilitates O 2 evolution.…”

Section: Transition Metal‐based Oer Electrocatalystsmentioning

confidence: 99%

Advanced Transition Metal‐Based OER Electrocatalysts: Current Status, Opportunities, and Challenges

Zhang

Zou

2021

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and sustainable energy sources, which have been considered as an encouraging solution to significantly reduce the dependency on traditional fossil fuels. Hydrogen is a promising clean energy carrier by virtue of zero-carbon content and the highest gravimetric energy density. [1] In this scenario, hydrogen production through electricity-driven water splitting represents a promising strategy for renewable energy conversion.Water electrolysis involves hydrogen evolution reaction (HER) on cathode and oxygen evolution reaction (OER) on anode. Theoretically, it requires a potential difference of 1.23 V between anode and cathode for driving the overall reaction. [2] But actually, a much higher voltage is needed in a practical water electrolyzer due to the overpotentials on both electrodes. HER is a relatively simple two-electron transport process involving electrochemical H + adsorption and desorption of H 2 . In contrast, OER is an inherently more complex process and has sluggish oxygen evolution kinetics, since it needs to transfer four electrons through multi-step reactions with single-electron transfer at each step. [3] As a result, the accumulation of energy at each step makes OER kinetically hindered and a large overpotential is needed to overcome the kinetic energy barrier. On the other hand, OER is an important half reaction involved in rechargeable metal-air batteries which are also regarded as the emerging sustainable energy conversion technology. Nevertheless, the bottlenecks such as low lifetimes, inferior energy conversion efficiency, and limited stability of metal-air batteries mainly originate from the intrinsically sluggish kinetics of OER. [4] Hence, developing effective and stable OER electrocatalysts by improving oxygen electrokinetics can significantly contribute to improving energy-conversion efficiency.To date, transition metal-based OER catalysts have been extensively studied by virtue of their excellent OER catalytic activities. [5] Noble-metal-based electrocatalysts have been considered as the most powerful electrocatalysts for OER in spite of their high prices. Among them, Ru and Ir have been verified to outperform Pt, Pd, and Rh. [6] Considering the high potential applied during OER, noble-metal oxides such as IrO 2 and RuO 2 are widely chosen as the state-of-the-art electrocatalysts. Nevertheless, RuO 2 is highly unstable in both acidic and alkaline electrolytes under high anodic potential. [7] Although IrO 2 Oxygen evolution reaction (OER) is an important half-reaction involved in many electrochemical applications, such as water splitting and rechargeable metal-air batteries. However, the sluggish kinetics of its four-electron transfer process becomes a bottleneck to the performance enhancement. Thus, rational design of electrocatalysts for OER based on thorough understanding of mechanisms and structure-activity relationship is of vital significance. This review begins with the introduction of OER mechanisms which include conventional adsorbate evolution mechanism and lattice-oxygen-mediated...

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“…Impressively, Cu 0.3 Co 2.7 P/NC has an ultralow overpotential and satisfying stability for OER, which is achieved with a small amount of Cu adding [32]. Under neutral conditions, the Cu-CoP NAs/CP displays unusual OER performance, which requests low overpotential of 411 mV to drive a current density value of 10 mA cm −2 [33]. Chestnut-like Cu 0.075 Co 0.925 P/CP with outstanding activity and excellent stability can serve as an effective OER electrocatalyst [1].…”

Section: Introductionmentioning

confidence: 99%

Co-Cu-P nanosheet-based open architecture for high-performance oxygen evolution reaction

Wang

Huang

et al. 2021

Appl. Phys. A

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The exploration of earth-abundant electrocatalysts and insight on the relationship between their activity and structure is challenging for large-scale electrochemical water oxidation. Herein, 2D Co-Cu-P nanosheets on Ni foam are fabricated by electrodeposition and subsequent phosphorization process. The Co-Cu-P nanosheets are highly interconnected to form an open-structured hierarchical network structure, which endows the product large surface area, efficient mass transportation, and fast gas releasing. In addition, the surface of Co-Cu-P would rapidly convert into hydroxides layer in the earlier oxygen evolution reaction (OER) process, which preserves the Co-Cu-P phosphide inside and serves as the real active sites for OER process. Benefiting from the rationally designed open-structured hierarchical network and the synergistic effect from the two kinds of metal cations with high conductivity, the resultant Co-Cu-P bimetal phosphide open-structured network delivers superb OER performance with an overpotential of 240 mV to drive a current density of 10 mA cm −2 in alkaline medium, outperforming the performance of the Co-P and Cu 3 P monometallic phosphide counterpart. This work provides a simple synthesis approach to construct bimetal phosphide with a rationally designed open-structured hierarchical network toward boosting electrocatalytic OER performance.

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Electronic modulation of cobalt phosphide nanosheet arrays via copper doping for highly efficient neutral-pH overall water splitting

Cited by 195 publications

References 59 publications

Hollow cobalt-nickel phosphide nanocages for efficient electrochemical overall water splitting

Hollow cobalt-nickel phosphide nanocages for efficient electrochemical overall water splitting

Advanced Transition Metal‐Based OER Electrocatalysts: Current Status, Opportunities, and Challenges

Co-Cu-P nanosheet-based open architecture for high-performance oxygen evolution reaction

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