Journal of Energy Storage
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2024
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IF 8.9
Heju Gao,Qihao Wu,Jiahui Jiang,Ting Zhao,Yuying Feng,Chunyan Wu,Guancheng Xu,Li Zhang
Reasonable construction of efficient bifunctional catalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) counts a great deal for the development and application of rechargeable zinc-air batteries. Herein, we prepared nano-sized heterostructural particles of cobalt phosphides (CoP/Co 2 P) confined in N, P-codoped cubic through simple grinding combined with vapor deposition method using the Co formic-acid framework (Co-FF) as the precursor. Benefit from the synergistic effect between the coexistence of abundant active sites including Co sites derived the CoP/Co 2 P nanoparticles, graphitic-N, pyridinic-N species and regulation of heterojunction interface electrons, the CoP/Co 2 P@NPC-800 catalyst exhibited excellent bifunctional catalytic activity toward ORR and OER, slightly better than commercial 20 % Pt/C. The liquid zinc-air battery demonstrates a specific capacity of 720.1 mAh g −1 and outstanding stability exceeds 250 h, comparable to 20 % Pt/C. Moreover, the flexible zinc-air battery can maintain good stability under different angles of bending. This study has a certain theoretical guiding significance for the rational regulation of the phase of cobalt-based phosphide to fabricate bifunctional oxygen catalysts for metal-air battery applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Wenxin Wang,Jiangjiang Zhang,Jinsheng Rong,Lanli Chen,Shiqiang Cui
Reducing the size of catalysts and tuning their electronic structure and interfacial properties are key to enhancing catalytic performance. Herein, a series of quantum-sized Co-based nanodot composites, including Co 3 O 4 /C, CoS 2 /C, CoN/C, and CoP/C, were synthesized using chemical vapor deposition (CVD) methods. By means of experimental measurement and theoretical calculation, CoP/C exhibited more robust electrochemical response than other Co-based compounds in electrochemical oxidation of N 2 H 4 (HzOR) and hydrogen evolution reaction (HER). The catalytic activities of CoP/C can be further enhanced by introducing Co vacancies on the surface of CoP/C (labeled as Co 1−x P/C). The results demonstrated that Co 1−x P/C not only exhibited notable electrochemical responses at an ultra-low N 2 H 4 concentration of 0.67 μM, showcasing its potential for ultra-sensitive N 2 H 4 detection but also realized HzOR instead of the oxygen evolution reaction (OER) half-reaction, thereby lowering the overpotential to 2.0 mV at 10.0 mA cm −2 . Finally, a Zn-hydrazine (Zn-Hz) battery was fabricated as a promising energy conversion device, showing the exceptional practical value of Co 1−x P/C.
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International Journal of Electrochemical Science
·
2023
·Vol. 17
·期 6
·220666
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IF 1.5
Haodong Zhou,Jingyi Zhao,Qidi Wu,Weijun Li,Jing Tang
For clean and renewable energy research, developing non-noble metal electrocatalysts with high activity and stability for the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) is critical. Herein, cobalt phosphide/N-doped carbon (CoP/NC) was synthesized by an extremely convenient approach. Compared with pure CoP, NC wrapped around CoP nanoparticles, which prevented the agglomeration and improved electron transfer of CoP. The obtained CoP/NC exhibited better activity than pure CoP, which has a low overpotential (η 10 =139/248 mV) and a small Tafel slope (59/82 mV dec −1 ) in 0.5 M H 2 SO 4 and 1 M KOH for the HER. CoP/NC exhibited excellent stability with no obvious change in activity for the HER after 5000 cycles. CoP/NC also had high ORR activity, which gave a more positive half-potential (0.85 V) and onset potential (0.9 V) than pure CoP at 1600 rpm in 0.1 M KOH.
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ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Xuebo Liu,Fangyuan He,Liwei Bai,Xiaowei Cao,Chang Liu,Wenbo Lu
Hydroquinone (HQ) and catechol (CC) are important chemical raw materials in the modern industry, unfortunately, which are also high toxic phenolic pollutants. So how to achieve highly sensitive and selective determination HQ and CC is the challenge we face. In the present work, we report a facile strategy to obtain nitrogen and phosphorous co-doped glucose-derived carbon coated CoP nanowires (G-CoP/N,P–C NWs), in which nitrilotriacetic acid (NTA) was as the chelating reagent, glucose was as carbon source, and the precursors were subsequently experienced carbonization and phosphorization process. G-CoP/N,P–C NWs can shorten the distance of the electron transport and expand the reaction area, showing the intriguing electronic conductivity and electrocatalytic abilities. An electrochemical phenolic sensor based on G-CoP/N,P–C NWs is fabricated. The as-prepared sensor showcases the good sensing performance for HQ and CC with comparative linearity ranges of 0.8–900 μM (HQ) and 0.6–800 μM (CC), low limits of detections (LODs) of 0.18 μM (S/N = 3) and 0.12 μM (S/N = 3) for HQ and CC, respectively. Notably, it also displays excellent practical application for the recognition of HQ and CC in the rain water, the tap water , the domestic wastewater and the lake water, which may be a promising candidate in environmental water monitoring and drinking water safety.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Xu Yu,Xinyu Wang,Pinyi He,Guohui Yang,Lijing Gao,Fu Qin,Yongkang Yao,Jianliang Bai,Lili Ren
The interfacial electron modulation of electrocatalysts is a useful technique for promoting catalyst performance for the water-related dissociation reactions. Herein, a high-efficient Fe-doped allotropic Co 2 P/CoP heterojunction nanoparticles embedded in N, P co-doped carbon matrix was constructed. The intense electrical interfacial contacts between the allotropic heterojunction optimized the reaction kinetics by boosting efficient charged active centers, regulating the intermediate adsorption/desorption. The incorporation of Fe atoms further enhancing the heterointerface contact between CoP and Co 2 P by providing favorable electronic properties and special coordination environment, causing the interfacial coupling enhancement. Therefore, Fe-Co 2 P/CoP possesses outstanding performance in both hydrogen evolution reaction and oxygen evolution reaction, with small overpotentials of 174 mV and 286 mV at 10 mA·cm −2 in alkaline medium, respectively. And only 1.71 V battery voltage is needed for the Fe-Co 2 P/CoP (+, −) cell device with satisfactory durability. This finding provides valuable insights into the engineering of electronic structures of well-designed metal phosphides for water electrolysis.
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Journal of Materials Chemistry A
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2024
·Vol. 12
·期 27
·16592-16604
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IF 10.7
Yajuan Zhang,Hui Xu,Xingwei Shi,Yuanhai Bao,Yong Chen
Designing non-precious-metal catalysts with performance matching that of precious-metal catalysts is crucial to the development of clean hydrogen energy. Herein, construction heterostructures and heteroatom doping strategies have been employed to construct an amorphous CoPB deposited on a crystalline Cu2S/Ni3S2 nanosheet (CoPB@Cu2S/Ni3S2) non-precious-metal electrocatalyst for water electrolysis. The introduction of Cu2+ successfully gave rise to an Ni3S2/Cu2S crystal–crystal heterostructure, on which the coating of the amorphous CoPB layer finally achieves a triple heterostructure by an electroless plating technique. The optimized electronic structure and geometry allow the CoPB@Cu2S/Ni3S2 catalyst to show a competitive catalytic performance, which requires just 25 mV of overpotential for the HER and 247 mV for the OER to achieve a current density of 10 mA cm−2. When loaded into an AEM water electrolyzer, the CoPB@Cu2S/Ni3S2‖CoPB@Cu2S/Ni3S2 cell just requires 1.84 V cell voltage to offer a large current density of 2000 mA cm−2, running for more than 1000 h without significant degradation in performance. This work demonstrates the benefit of the integration of the heterostructures and heteroatom doping strategies to prepare catalysts and provides a scientific basis for the development of high-performance non-precious-metal water electrolysis catalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
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IF 8.3
Yutong Li,Qiuhong Wei,Haoyue Huang,Shujun Qiu,Yongpeng Xia,Yongjin Zou,Fen Xu,Lixian Sun,Hailiang Chu
Catalyst development remains a critical challenge in chemical hydrogen storage. In particular, efficient, cost-effective heterogeneous catalysts are essential for ammonia borane (NH 3 BH 3 , AB) hydrolysis to enable hydrogen generation. In this study, we developed a self-assembly strategy to fabricate a unique catalyst consisting of a Ru-modified CoN/CoP heterogeneous structure on an MXene support of Ti 3 C 2 T x , creating more multiphase interfaces. Through optimizing experimental conditions, a superior Ru–CoN/CoP@Ti 3 C 2 T x catalyst is achieved, which demonstrates a rapid hydrogen generation rate ( HGR = 1.43 × 10 5 mL min −1 ·g Ru −1 ) and a high turnover frequency ( TOF = 589.7 mol H2 ·mol Ru −1 ·min −1 ) at 25 °C, surpassing most previously reported Ru-based catalysts. The catalytic performance improvement of AB hydrolysis can be ascribed to a much lower apparent activation energy ( E a = 26.3 kJ mol −1 ) and the synergistic effect between CoN/CoP substrates and their interactions with Ru particles and Ti 3 C 2 T x carriers. This study highlights the potential of multi-interface cooperation in advancing the design of heterogeneous catalysts for AB hydrolysis.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Ying-jie Sun,Xue-ting Liu,Xin-jie Zhao,Xiao-jing Wang,Jun Zhao,Yu-pei Li,Hui-ying Mu,Fa-tang Li
The tuning of the Mott–Schottky barrier for obtaining superior separation and transfer efficiency of photogenerated carriers is significant for metallic co-catalyst-modified photocatalytic materials. Metallic cobalt phosphide (CoP) has been regarded as a promising co-catalyst for replacing Pt in the photocatalytic hydrogen evolution reaction (HER). However, it is still challenging to enhance the kinetics of CoP for the HER while lowering the Schottky barrier and improving electron transport properties. Herein, Mo metal was introduced into CoP and graphite carbon nitride (g-C3N4) as a bridge of electron transfer channels for synchronous tuning of the Schottky barrier. The analyses showed that the original Schottky contact between CoP and g-C3N4 was transformed into an ohmic contact by the introduction of metallic Mo, which caused a decrease in the Schottky barrier and even improved the charge transfer, lowered the HER potential, and accelerated the HER kinetics process of CoP. After rational assembly, the optimum photocatalyst (Mo-CoP@CN-1.0) showed a remarkable photocatalytic HER rate of 1.47 mmol g−1 h−1 under visible light irradiation, which was about twice as high as that of the optimal Pt modified g-C3N4. This study provides a new prospect for the rational design of a high-efficiency co-catalyst and provides a new way for regulating the Mott–Schottky barrier.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 9
·2714-2727
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IF 5
Zhiqi Guo,Yao Tian,Guangjin Dou,Ye Wang,Jiaping He,Hao Song
Photocatalytic pure water splitting to produce H2 with a two-electron process is an effective and more kinetically favorable method to obtain clean energy. Herein, a CoP decorated 2D/2D red phosphorus/B doped g-C3N4 (CoP/RP/BCN) type II heterojunction is synthesized to realize photocatalytic pure water splitting via a two-electron process. The optimal ternary CoP/RP/BCN photocatalyst displays a prominent H2 yield of 166.2 μmol h−1 g−1, which is 207.8-fold greater than that of g-C3N4. The deep insight into the photocatalytic mechanism of CoP/RP/BCN reveals that the improved photocatalytic efficiency is ascribed to the synergistic effect of extended light absorption, accelerated charge transfer, and increased active reaction sites due to the novel heterostructure RP/BCN and co-catalyst CoP loaded. The introduction of B facilitates the intrinsic charge excitation and increases the work function of the carbon nitride framework, promoting charge transfer and heterojunction formation. With a phosphorization reaction, RP nanosheets tightly combine with BCN to enhance the visible-light absorption and construct the 2D/2D type II heterojunction. The difference in the work function between RP and BCN leads to band bending in the interface of the heterojunction, which induces an opposite migration of electrons and holes to enhance electron–hole pair separation. Moreover, CoP reduces water adsorption energy and provides H2 generation sites, facilitating the final step of pure water splitting to produce H2. This work proposes a promising strategy to achieve highly effective photocatalytic pure water splitting without any sacrificial reagents.
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NEW CARBON MATERIALS
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2024
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IF 6.5
Xiao-li Yan,Kui Wang,Shu-wei Hao,Guang-da Zhou,Hao-wei Yang,Hua Zhang,Jun-jie Guo
Exploring cost-efficient and highly-efficient noble metal-free catalysts for the oxygen reduction reactions (ORRs) involved in sustainable energy devices remains a great challenge. Transition-metal phosphides supported on heteroatom-doped carbons have shown potential as alternative candidates for precious metals because of their tunable electronic structures and higher catalytic performance. Phosphating was used to construct CoP nanoparticles (NPs) anchored on a nitrogen-doped porous carbon framework (CoP@NC) from Co NPs loaded on NC, using PH 3 gas released from NaH 2 PO 2 during heat treatment. The dodecahedral structure of Co NPs was retained in their transformation to CoP NPs. The CoP@NC electrocatalyst shows a remarkable ORR activity with a half-wave potential up to 0.92 V under alkaline conditions, which is attributed to the combined coupling between the well dispersed CoP nanoparticles on the nitrogen-doped carbon and the efficient mass transport in the porous structure. Zinc-air batteries assembled with the CoP@NC electrocatalyst as a cathode have a high open-circuit voltage of 1.51 V and power density of 210.1 mW cm −2 . This work provides a novel strategy to develop low-cost catalysts with an excellent ORR performance to promote their practical use in metal-air batteries
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Songjie Li,Tiantian Liu,Shuang Yu,Xiaomei Yu,Huijing Yang,Chengduo Wang,Jin You Zheng
Hydrogen production via electrocatalytic water splitting has garnered significant attention, due to the growing demand for clean and renewable energy. However, achieving low overpotential and long-term stability of water splitting catalysts at high current densities remains a major challenge. Herein, a CoP@CoNi layered double hydroxide (LDH) electrode was synthesized via a two-step electrodeposition process, demonstrating oxygen evolution reaction, with an overpotential (ƞ 400 ) of 373 mV and a Tafel slope of 64.2 mV/dec. Subsequently, a superhydrophilic CoP@CoNi LDH-Pt electrode was prepared using an in situ oxidation method, with Pt clusters anchored within the CoP@CoNi LDH for the hydrogen evolution reaction, with an overpotential (ƞ 400 ) of 119 mV and a Tafel slope of 33.6 mV/dec. The CoP@CoNi LDH-Pt||CoP@CoNi LDH system achieved a cell voltage of 1.96 V at 1000 mA/cm 2 , maintaining stable performance after water electrolysis for 160 h. These remarkable outcomes stem from the fast charge transfer, improved mass transfer, and superior stability of the catalysts. Heterostructure electrodes were constructed to optimize the electrocatalytic kinetics through strong interfacial electronic interactions, while superhydrophilic electrodes were fabricated to improve the mass transfer process at a high current density. Anchoring high-activity components in catalysts prevents their detachment during water electrolysis, enhancing the structural stability of the electrodes. This study provides a new approach for large-scale preparation of efficient water electrolysis catalysts and offers significant potential for industrial hydrogen production applications.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xiaowei Fu,Qichang Li,Hongdong Li,Weiping Xiao,Zhenyu Xiao,Guangrui Xu,Dehong Chen,Zexing Wu,Lei Wang
Transition-metal phosphides (TMPs) have attracted extensive attention in energy-related fields, especially for electrocatalytic hydrogen evolution reaction (HER). However, it is imperative to develop a facile and time-consuming approach to prepare metal phosphides with satisfactory catalytic performance. Herein, nitrogen-doped CoP-Co2P decorated with Ru (Ru/N-CoP-Co2P) is synthesized (Ru/N-CoP-Co2P) through a hydrothermal route and following an ultrafast and simple microwave avenue within 20 s. The achieved Ru/N-CoP-Co2P possesses an interconnected porous morphology to expose abundant active sites and accelerate the mass transport. Moreover, N doping and Ru-supported decorated Ru/N-CoP-Co2P also play a key role in promoting the electrocatalytic activity. Therefore, the as-designed Ru/N-CoP-Co2P presents good catalytic performance for the HER in a wide pH range. Ru/N-CoP-Co2P merely needs overpotentials of 63, 100, and 65 mV to obtain 10 mA cm–2 in acidic, alkaline, and seawater electrolytes. This research provides a novel and efficient strategy for the synthesis of TMPs with highly efficient catalytic activity.
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