JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Ying Liu,Fei Yang,Wei Qin,Guowei Yang
The Co 2 P@NiCo 2 O 4 bi-functional electrocatalyst was fabricated for hydrogen evolution reaction and oxygen evolution reaction in acidic, neutral and alkaline media. The Co 2 P@NiCo 2 O 4 in alkaline media exhibites an extremely low overpotential of 170 mV in oxygen evolution to achieve a current density of 10 mA cm −2 and produces stable water splitting nearly 30 h. The anchored-Co 2 P can enhance the electrochemical performance of pristine NiCo 2 O 4 as well as increase the tolerance in acidic media of NiCo 2 O 4 . Additional, the Co 2 P is oxidized to oxides/hydroxides species during the electrocatalytic reaction , which acts as the active centers of the electrocatalysis . The Co 2 P@NiCo 2 O 4 catalyst can be used as an effective bifunctional synergistic center in a wide range of pH values (from 0 to 14).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Weiliang Zhou,Xiaojie Li,Xuan Li,Jiaxin Shao,Hengpan Yang,Xiaoyan Chai,Qi Hu,Chuanxin He
The rational design of bifunctional electrocatalysts is essential to achieve efficient hydrogen production from water splitting. Here, inspired by cocatalysts widely utilized in photocatalysis , we designed a heterostructure comprising amorphous VO 2 and crystalline NiS 2 , aiming at using VO 2 cocatalyst to boost activity of NiS 2 for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Intriguingly, we found that VO 2 displayed different co-catalytic function in boosting the OER and HER. Specifically, the VO 2 optimized the binding energy of hydrogen intermediate on NiS 2 and thus improved the HER activity. As for the OER, the amorphous VO 2 was easily dissolved in the KOH electrolyte, resulting in the generation of abundant oxygen vacancies in the in-situ generated active phase of NiOOH from NiS 2 , thereby drastically enhancing the OER activity. Consequently, the obtained VO 2 –NiS 2 @CC displayed excellent performance for overall water splitting, with a low voltage of 1.53 V at 10 mA cm −2 .
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2023
·
IF 5.6
Shixiong Min,Zhe Meng,Yaoyao Zhao,Wenjing Li,Zhengguo Zhang,Fang Wang
Developing cost-effective and efficient hydrogen/oxygen evolution reaction (HER/OER) electrocatalysts that can work stably at industrial-level current densities is of paramount importance for the scalable implementation of water electrolysis. Herein, a monolithic chainmail electrode is fabricated by embedding self-phosphorized graphitic carbon-encapsulated Co2P nanoparticles within a hierarchically porous carbon membrane matrix (Co2P@CTF) via the direct carbonization of a Co2+-cross-coupled soybean protein framework. While formulating the soybean protein framework into a hierarchically porous, mechanically strong, and conductive carbon membrane, the endogenous N and P sources enable the heteroatom doping of the carbon matrix while simultaneously yielding graphitic carbon-encapsulated Co2P nanoparticles. Such an integrated Co2P@CTF monolithic electrode exhibits remarkable alkaline water splitting performance with low overpotentials of 177.5 and 388.4 mV at 100 mA cm−2 for the HER and OER, respectively, with excellent stability for the HER even at 1000 mA cm−2 over 100 h and for the OER at 100 mA cm−2 for >50 h. An electrolyzer assembled using Co2P@CTF requires a cell voltage of 1.69 V at 10 mA cm−2 with a high solar-to-hydrogen (STH) conversion efficiency of 16.8% when powered using a commercial silicon solar cell. This work opens a new avenue for scalable fabrication of monolithic chainmail electrodes with desirable functionalities for sustainable electrochemical energy conversion.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 29
·期 5
·e202202858
·
IF 5.02
Yongsheng Wang,Xinyu Wang,Hailong Wei,Junling Huang,Likun Yin,Wei Zhu,Zhongbin Zhuang
Graphical This work reports the homogeneous incorporation of Co into the FeP host to promote both activity and stability of HER for the PEMWE application and demonstrates the probable origin of the high performance by ex situ experiments. Metal phosphides are promising noble metal-free electrocatalysts for hydrogen evolution reaction (HER), but they usually suffer from inferior stability and thus are far from the device applications. We reported a facile and controllable synthetic method to prepare metal-incorporated M-FeP nanoparticles (M=Cr, Mn, Co, Fe, Ni, Cu, and Mo) with the guide of the density functional theory (DFT). The evaluated HER activity sequence was consistent with the DFT predictions, and cobalt was revealed to be the appropriate dopant. With the optimization of the Co/Fe ratio, the Fe 0.67 Co 0.33 P/C only required overpotentials of 67 mV and 129 mV to obtain the cathodic current density of 10 and 100 mA cm −2, respectively. It maintained the initial activity in the 10 h stability test, surpassing the other Co-FeP/C catalysts. Ex situ experiments demonstrated that the decreased element leaching and the increased surface phosphide content contributed to the high stability of the Fe 0.67 Co 0.33 P/C. A proton exchange membrane water electrolyzer was assembled using the Fe 0.67 Co 0.33 P/C as the cathodic catalyst. It showed a current density of 0.8 A cm −2 at the applied voltage of 2.0 V and retained the initial activity in the 1000 cycles’ stability test, suggesting the potential application of the catalysts.
研究领域:
电化学
·
材料科学
·
催化
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RENEWABLE ENERGY
·
2024
·
IF 9
Yuming Huang,Wei Zhou,Liang Xie,Junfeng Li,Xiaoxiao Meng,Xuewei Zhang,Yang Yu,Miaoting Sun,Jiaxiang Chen,Lijie Wang,Jihui Gao,Guangbo Zhao
Integrating the hydrogen evolution reaction (HER) with the carbon oxidation reaction (COR) is a promising method for producing H₂ with lower energy consumption. However, due to the passivation effect of oxygen functional groups (OFGs) for COR and Fe³⁺, achieving efficient and sustainable carbon oxidation to assist water electrolysis for hydrogen production remains a challenge over the past decades. This study introduced [EDTA·Fe(III)] – as a mediator to promote COR. [EDTA·Fe(III)] – effectively prevented the oxidation layer on the carbon surface from anchoring Fe (III) and reactivated the carbon that had been passivated by the oxidation layer. Density functional theory calculations indicated that the notable COR activity resulted from [EDTA·Fe(III)] – effectively lowering the vertical ionization potential of carbon, without being affected by OFGs. Notably, in the HER||COR-[EDTA·Fe(III)] – system, a cell voltage of merely 0.74 V is sufficient to reach a current density of 10 mA cm −2 , with the corresponding energy consumption being 1.76 kWh Nm −3 (H 2 ). This strategy offers new insights into achieving stable, low-energy hydrogen production via water electrolysis.
研究领域:
能源化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhaolong Wang,Xiaolong Wang,Jinsong Xiong,Mingzhu Xie,Yong Shuai
Water electrolysis offers the advantages of emission-free and highly efficient energy conversion in terms of sustainable energy development and environmental pollution. However, water electrolysis is strongly affected by the detachment of bubbles from the electrodes commonly enabled by buoyancy, thereby reducing the performance of the electrolytic cells in harsh environments like in space. Herein, a bionic Janus microchannels with active gas–liquid separation for water electrolysis is proposed. There is a Janus membrane with superaerophilic top surface and inner micropores over the microchannels, and such a unique type of microchannels can capture and unidirectionally manipulate the hydrogen (H 2 ) bubbles generated on the surface of the electrode during the water electrolysis reaction at high speed with long-term stability. It is worth noting that the gas–liquid separation through the Janus membrane does not hinder the flow of electrolyte in the microchannel due to its hydrophilic inside surfaces, which can maintain the great stability of the electrolysis. Moreover, mimicked leaves and trees for water catalysis are further demonstrated with ultrahigh electrolysis efficiency based on the active detachment of H 2 bubbles enabled by Janus micropores. The present bionic Janus microchannels for high-efficient water electrolysis to produce H 2 is intended to provide a new power supply solution for human space living and exploration.
研究领域:
能源科学
·
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Shaolong Yang,Jinxin An,Xianbo Xiang,Zhitao Han,Xinxiang Pan
Seawater electrolysis is an attractive way to generate hydrogen energy . However, to commercialize this technology, it has been focused on developing chlorine-less oxygen generating electrodes for decades. Here, different from common ideas of minimizing chlorine formation at the anode, we aimed at reusing the waste chlorine from seawater electrolysis to mitigate nitrogen oxide (NOx) emissions. NOx removal performance of electrolyzed seawater containing chlorine was investigated under 254 nm ultraviolet (UV) irradiation in a semi-continuous bubbling reactor. Comparative parametric experiments were conducted for each factor with and without UV irradiation. Significant contributions of UV irradiation on denitrification performance of chlorine were observed under all investigated conditions. A ten-folder improvement in denitrification efficiency by the UV irradiated electrolyzed seawater was achieved under optimal conditions. Possible free radicals’ reaction mechanisms were discussed preliminarily. Results reveal that UV irradiated electrolyzed seawater is a promising way to reuse electrolyzed chlorine and mitigate acid gas emissions.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2016
·
IF 4.569
Xiaojuan Chen,Guangfeng Zeng,Taotao Gao,Zhaoyu Jin,Yajie Zhang,Hongyan Yuan,Dan Xiao
Electrochemical water splitting in an alkaline electrolyte for large-scale hydrogen production is currently a hot research topic. However, developing high-performance and durable oxygen-evolving electrocatalysts is an ongoing challenge. In this work we prepared Ni-phytate thin films with a bubble-like structure on Ni-foam through an in situ growth process. The resulting material can be used as an oxygen-evolving electrode in basic media without requiring the use of a conductive binder. The Ni-phytate electrode has high catalytic activity ( η j = 10 mA cm − 2 = 280 mV) and good stability (the current activity remained 95% after 5 h) towards OER. This is an effective approach to simplifying the large-scale preparation of catalysts for water-splitting applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2019
·
IF 4.888
Peiman Xu,Lijun Qiu,Licheng Wei,Yiyi Liu,Dingsheng Yuan,Yi Wang,Panagiotis Tsiakaras
The efficient design of highly active, economical and stable electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolyte still remains a great challenge. Herein, Mn doped Ni 2 P microflowers with porous feature directly grown on Ni foam have been successfully synthesized via a facile hydrothermal method and phosphorization treatment. By detailed analyzing X-ray photoelectron spectroscopy results, it can be found that the electronic structure of Ni 2 P can be efficiently regulated by Mn doping. As expected, the Mn-doped Ni 2 P microflowers with an optimal Mn/Ni ratio of 0.053 exhibit a low overpotential of 205 mV for HER and 330 mV for OER to achieve a current density of 100 mA cm −2 in 1.0 M KOH solution. Furthermore, when this electrocatalyst is adopted as both the cathode and anode for overall water splitting, a current density of 10 mA cm -2 is achieved at a cell voltage as low as 1.58 V, accompanied with high stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ziqiang Wang,Guanghui Yang,Pengjun Tian,Xinmiao Li,Kai Deng,Hongjie Yu,You Xu,Hongjing Wang,Liang Wang
The use of thermodynamically more favorable sulfion oxidation reaction (SOR) to replace sluggish oxygen evolution reaction is an effective method for energy-saving production of hydrogen. Herein, we propose the synthesis of organic–inorganic hybrid through the modification of 1-hydroxyethylidene-1,1-diphosphonic acid on Rh metallene (HEDP-Rh metallene) as a bifunctional electrocatalyst for hydrogen evolution reaction (HER) and SOR. The modification of hydrophilic HEDP can effectively promote the water adsorption, thereby accelerating the mass/electron transfer at the interface. The HEDP-Rh metallene requires low overpotentials of 30 mV at 10 mA cm −2 for HER and 0.538 V at 100 mA cm −2 for SOR. In HER-SOR coupled reaction, HEDP-Rh metallene drives the current density of 100 mA cm −2 at 1.08 V for concurrent production of hydrogen and sulfur, highlighting energy-efficient hydrogen production and sulfur recycle.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 2
·1-13
·
IF 23.2
Zhang Hao,Zhu Liyan,Shen Yuhan,Wu Mingjuan,Tian Tian,Tang Haolin
Slow oxygen evolution reaction (OER) and material transport impedance in catalyst-coated membrane (CCM) are major challenges for the practical proton exchange membrane water electrolyzer (PEMWE). Herein, we present a novel OER catalyst by polyether-derived composite oxide pyrolysis with a multilevel porous support and abundant oxygen vacancies to boost efficiency and durability in water electrolysis. The formation of a heterointerface with abundant oxygen vacancies in IrO x improves the catalytic activity and prevents IrO x from peroxidation. Furthermore, the unique pore structure of the support facilitates the mass transport of the anode catalyst layer during water electrolysis at high current density, and the mass transport resistance of the water electrolyzer is only 0.0154 Ω cm 2 at 1.5 A cm −2 . When used in a PEMWE, the prepared electrocatalysts have an impressive electrochemical performance of 1.87 V at 3·A cm −2 with an Ir loading of only 0.91 mg cm −2 . This approach highlights the importance of oxygen vacancies and transportation in the catalyst-support interface, providing a promising solution for high-rate practical water electrolysis. Graphical
Efficient OER supported catalysts enriched with oxygen vacancies for PEMWE applications
研究领域:
电化学
·
催化
·
材料科学
·
能量转换
·
纳米技术
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Shengke Tang,Ding Li,Xiang Wu
The exploration of high-active and durable transition metal phosphides (TMPs) electrocatalysts is important for the development of green and sustainable energy technology. However, the poor stability and expensive prices of the catalysts restrict their applications in electrolysis of water. Doping metal atoms can improve the total performance of TMPs. Herein, we prepare several Mo doped Co0.4Fe1.6P materials through one step hydrothermal route. The Mo-Co0.4Fe1.6P-5% sample possesses 73 mV@10 mA cm-2 and 260 mV@50 mA cm-2 for HER and OER, respectively. Moreover, it delivers 1.787 V at 100 mA cm-2 for electrolysis of water. The catalysts also present a cycle life of 300 h. It demonstrates a facile approach to engineer high-performance non-precious metal electrocatalysts toward efficient water splitting.
研究领域:
能源技术
·
电化学
·
材料科学
·
催化
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）