Oxygen vacancies engineered CoMoO4 nanosheet arrays as efficient bifunctional electrocatalysts for overall water splitting

Chi, Kai; Tian, Xin; Wang, Qijun; Zhang, Zheye; Zhang, Xiangyu; Zhang, Yan; Feng, Jing; Lv, Qiying; Yao, Wei; Xiao, Fei; Wang, Shuai

doi:10.1016/j.jcat.2019.10.025

Cited by 95 publications

(39 citation statements)

References 62 publications

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“…A similar work reported by Chi et al [45] . demonstrated a facile method to prepare oxygen‐deficient bifunctional CoMoO 4 nanosheet arrays grown on 3D porous Ni foam (NF) denoted as NF/H‐CoMoO 4 as shown in Figure 1d.…”

Section: Strategies For Preparing Oxygen‐deficient Metal Oxidesmentioning

confidence: 70%

“…As reported, the enhanced HER activity was also attributed to the synergetic effect of the metallic Co core and the amorphous Co 3 O 4 and/or CoO shell, which facilitates surface activity and bulk conductivity. A similar work reported by Chi et al [45] demonstrated a facile method to prepare oxygen-deficient bifunctional CoMoO 4 nanosheet arrays grown on 3D porous Ni foam (NF) denoted as NF/H-CoMoO 4 as shown in Figure 1d. Pristine NF/CoMoO 4 nanosheet arrays were annealed in a reducing H 2 /Ar atmosphere at 400°C.…”

Section: Hydrogen Reductionmentioning

confidence: 71%

“…The latter values are substantially lower than the values obtained with NF/CoMoO4, which were 223 and 330 mV for HER and OER, respectively. Chi et al [45] . reported that the formation of the amorphous component MoO x contributed to the improved OER and HER activity of NF/H‐CoMoO 4 .…”

Section: Strategies For Preparing Oxygen‐deficient Metal Oxidesmentioning

confidence: 99%

“…The latter values are substantially lower than the values obtained with NF/CoMoO4, which were 223 and 330 mV for HER and OER, respectively. Chi et al [45] reported that the formation of the amorphous component MoO x contributed to the improved OER and HER activity of NF/H-CoMoO 4 . Thus, besides the generation of oxygen defects, thermal annealing in a reductive environment in some cases can also lead to the formation of favorable secondary amorphous active phases, which can improve the activity of metal oxides.…”

Section: Hydrogen Reductionmentioning

confidence: 99%

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Oxygen‐Deficient Cobalt‐Based Oxides for Electrocatalytic Water Splitting

2020

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An apparent increased interest has been recently devoted towards the previously untrodden path for anionic point defect engineering of electrocatalytic surfaces. The role of vacancy engineering in improving photo‐ and electrocatalytic activities of transition metal oxides (TMOs) has been widely reported. In particular, oxygen vacancy modulation on electrocatalysts of cobalt‐based TMOs has seen a fresh spike of research work due to the substantial improvements they have shown towards oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Oxygen vacancy engineering is an effective scheme to quintessentially tune the electronic structure and charge transport, generate secondary active surface phases, and modify the surface adsorption/desorption behavior of reaction intermediates during water splitting. Based on contemporary efforts for inducing oxygen vacancies in a variety of cobalt oxide types, this work addresses facile and environmentally benign synthesis strategies, characterization techniques, and detailed insight into the intrinsic mechanistic modulation of electrocatalysts. It is our foresight that appropriate utilization of the principles discussed herein will aid researchers in rationally designing novel materials that can outperform noble metal‐based electrocatalysts. Ultimately, future electrocatalysis implementation for selective seawater splitting is believed to depend on regulating the surface chemistry of active and stable TMOs.

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Section: Strategies For Preparing Oxygen‐deficient Metal Oxidesmentioning

confidence: 70%

Section: Hydrogen Reductionmentioning

confidence: 71%

Section: Strategies For Preparing Oxygen‐deficient Metal Oxidesmentioning

confidence: 99%

Section: Hydrogen Reductionmentioning

confidence: 99%

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Oxygen‐Deficient Cobalt‐Based Oxides for Electrocatalytic Water Splitting

2020

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“…Hence, it is an urgent desire for researchers to develop many different kinds of bifunctional electrocatalysts with different performance to promote the development of H 2 fuels [30]. Transition metal oxide [31,32], transition metal sulfides [33][34][35][36][37][38][39] and selenides [40][41][42][43], transition metal phosphides [44][45][46][47][48][49], transition metal nitrides [50][51][52] become potential candidates as non-noble metal electrocatalysts for electrolysis of water. The Ni 3 S 2 /MnS-O nanosheets on Ni foam (NF/T(Ni 3 S 2 /MnS-O)) were employed as anode and cathode for overall water splitting ( Fig.…”

Section: Electrocatalysts For Overall Water Splittingmentioning

confidence: 99%

Water Splitting: From Electrode to Green Energy System

et al. 2020

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HIGHLIGHTS • Bifunctional electrode and electrolytic cell configuration for electrochemical water splitting are reviewed. • The different green energy systems powered water splitting are summarized and discussed. • An outlook of future research prospects for the development of green energy system powered water splitting in practical application process is proposed. ABSTRACT Hydrogen (H 2) production is a latent feasibility of renewable clean energy. The industrial H 2 production is obtained from reforming of natural gas, which consumes a large amount of nonrenewable energy and simultaneously produces greenhouse gas carbon dioxide. Electrochemical water splitting is a promising approach for the H 2 production, which is sustainable and pollution-free. Therefore, developing efficient and economic technologies for electrochemical water splitting has been an important goal for researchers around the world. The utilization of green energy systems to reduce overall energy consumption is more important for H 2 production. Harvesting and converting energy from the environment by different green energy systems for water splitting can efficiently decrease the external power consumption. A variety of green energy systems for efficient producing H 2 , such as two-electrode electrolysis of water, water splitting driven by photoelectrode devices, solar cells, thermoelectric devices, triboelectric nanogenerator, pyroelectric device or electrochemical water-gas shift device, have been developed recently. In this review, some notable progress made in the different green energy cells for water splitting is discussed in detail. We hoped this review can guide people to pay more attention to the development of green energy system to generate pollution-free H 2 energy, which will realize the whole process of H 2 production with low cost, pollution-free and energy sustainability conversion.

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Recent Progress of Vacancy Engineering for Electrochemical Energy Conversion Related Applications

Zhao

Jin

et al. 2020

Adv Funct Materials

212

129

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Efficient electrocatalysts are key requirements for the development of ecofriendly electrochemical energy‐related technologies and devices. It is widely recognized that the introduction of vacancies is becoming an important and valid strategy to promote the electrocatalytic performances of the designed nanomaterials. In this review, the significance of vacancies (i.e., cationic vacancies, anionic vacancies, and mixed vacancies) on the improvement of electrocatalytic performances via three main functionalities, including tuning the electronic structure, regulating the active sites, and improving electrical conductivity, is systematically discussed. Recent achievements in vacancy engineering on various hotspot electrocatalytic processes are comprehensively summarized, with focus on the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reaction (HER), nitrogen reduction reaction (NRR), CO2 reduction reaction (CO2RR), and their further applications in overall water‐splitting and zinc–air battery devices. The recent development of vacancy engineering for other energy‐related applications is also summarized. Finally, the challenges and prospects of vacancy engineering to regulate the electrocatalytic performances of different electrochemical reactions are discussed.

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Oxygen vacancies engineered CoMoO4 nanosheet arrays as efficient bifunctional electrocatalysts for overall water splitting

Cited by 95 publications

References 62 publications

Oxygen‐Deficient Cobalt‐Based Oxides for Electrocatalytic Water Splitting

Oxygen‐Deficient Cobalt‐Based Oxides for Electrocatalytic Water Splitting

Water Splitting: From Electrode to Green Energy System

Recent Progress of Vacancy Engineering for Electrochemical Energy Conversion Related Applications

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