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Small-sized Ni-Co/MoC/CoMoC@C for efficient alkaline and acidic hydrogen evolution reaction by an anchoring calcination

Frontiers of Chemical Science and Engineering 2024, Volume 18, Issue 5, doi: 10.1007/s11705-024-2416-2

Abstract: A novel, cheap and highly efficient Ni-Co/Mo2C/Co6Mo6C2@C nanocomposite has been successfully constructed through simple one-step carbonization method in a nitrogen atmosphere. Polyethyleneimine in the precursor can effectively anchor molybdenum-based Keggin-type polyoxometallate and NiCo-layered double hydroxide through electrostatic and coordination interactions, which avoids the aggregation of catalyst particles during the pyrolysis process. After optimization, the obtained Ni-Co/Mo2C/Co6Mo6C2@C possesses small size (3–8 nm), large specific surface area and hierarchical pore structure. More importantly, Ni-Co/Mo2C/Co6Mo6C2@C presents remarkable hydrogen evolution reaction activity with low overpotentials in 0.5 mol·L–1 H2SO4 (102.3 mV) and 1 mol·L–1 KOH (95 mV) to afford the current density of 10 mA·cm–2, as well as small Tafel slopes of 82.49 and 99.92 mV·dec–1, respectively. Simultaneously, this catalyst also shows outstanding stability for 12 h without a significant change in current density. The excellent catalytic performance of Ni-Co/Mo2C/Co6Mo6C2@C can put down to the synergistic effect between multiple components and the small size of the catalyst. This work provides unique insights into the preparation of efficient transition metal-based catalysts for HER.

Keywords： polyoxometallates     layered double hydroxide     transition metal-based electrocatalysts     hydrogen evolution reaction    

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Enhancing the adsorption function of biochar by mechanochemical graphitization for organic pollutant removal

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 6, doi: 10.1007/s11783-021-1418-2

Abstract:

• Mechanochemical treatment reduced the calcination temperature for

Keywords： Biochar     Mechanochemical treatment     Graphitization     Calcination temperature     Organic pollutant    

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WO3 nanomaterials synthesized via a sol-gel method and calcination for use as a CO gas sensor

Diah SUSANTI,A.A. Gede Pradnyana DIPUTRA,Lucky TANANTA,Hariyati PURWANINGSIH,George Endri KUSUMA,Chenhao WANG,Shaoju SHIH,Yingsheng HUANG

Frontiers of Chemical Science and Engineering 2014, Volume 8, Issue 2,   Pages 179-187 doi: 10.1007/s11705-014-1431-0

Abstract: Carbon monoxide is a poisonous and hazardous gas and sensitive sensor devices are needed to prevent humans from being poisoned by this gas. A CO gas sensor has been prepared from WO synthesized by a sol-gel method. The sensor chip was prepared by a spin-coating technique which deposited a thin film of WO on an alumina substrate. The chip samples were then calcined at 300, 400, 500 or 600 °C for 1 h. The sensitivities of the different sensor chips for CO gas were determined by comparing the changes in electrical resistance in the absence and presence of 50 ppm of CO gas at 200 °C. The WO calcined at 500 °C had the highest sensitivity. The sensitivity of this sensor was also measured at CO concentrations of 100 ppm and 200 ppm and at operating temperatures of 30 and 100 °C. Thermogravimetric analysis of the WO calcined at 500 °C indicated that this sample had the highest gas adsorption capacity. This preliminary research has shown that WO can serve as a CO gas sensor and that is should be further explored and developed.

Keywords： WO3 nanomaterial     sol-gel     calcinations     CO gas sensor     sensitivity    

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Pd-Fe/α-Al

Shengping WANG, Xin ZHANG, Yujun ZHAO, Yadong GE, Jing LV, Baowei WANG, Xinbin MA

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 3,   Pages 259-269 doi: 10.1007/s11705-012-1212-6

Abstract: Cordierite monoliths coated with Pd-Fe/α-Al O catalysts were prepared at various calcination temperaturesMonolithic catalysts with calcination temperatures ranging from 473 K to 673 K exhibited excellent dispersion

Keywords： dimethyl oxalate     coupling     Pd     cordierite     monolith     calcination     structure    

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A study on the catalytic performance of Pd/γ-Al

Ruizhi CHU, Xianyong WEI, Zhimin ZONG, Wenjia ZHAO

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 4,   Pages 452-456 doi: 10.1007/s11705-010-0522-9

Abstract: A series of Pd/γ-Al O hybrid catalysts were prepared by impregnation and subsequent calcination underThe results show that calcination under microwave irradiation improved both the activity and selectivity

Keywords： Pd/γ-Al2O3     direct synthesis     dimethyl ether     calcination under microwave irradiation    

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Preparation of ultrafine α-AlO using precipitation-azeotropic distillation method

XIAO Jin, QIN Qi, ZHOU Feng, CHEN Yanbin, WAN Ye

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 2,   Pages 226-231 doi: 10.1007/s11465-008-0029-y

Abstract: The phase transformation of alumina during the calcination process can be described as amorphous AlOThe crystal grain size and density of ultrafine alumina powder increase with the increase of the calcination

Keywords： calcination temperature     spherical     AACH     carbonate hydroxide     ammonium carbonate    

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Comparison of the morphology and structure of WO

Diah Susanti, Stefanus Haryo N, Hasnan Nisfu, Eko Prasetio Nugroho, Hariyati Purwaningsih, George Endri Kusuma, Shao-Ju Shih

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 4,   Pages 371-380 doi: 10.1007/s11705-012-1215-3

Abstract: nanomaterials were synthesized by a sol-gel method using WCl and C H OH as precursors followed by calcinationThe XRD results revealed that calcination temperatures of 300°C and 400°C gave hexagonal structures andThe SEM images showed that an increase in calcination temperature led to a decrease in the WO powder

Keywords： WO3 nanomaterial     sol-gel method     calcination     hydrothermal    

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Clean Burning Process of Coal Which Converts Pollutants into Value-added Products

Zhu Xuefang

Strategic Study of CAE 1999, Volume 1, Issue 1,   Pages 53-57

Abstract: together to form affinity granules, which are sprayed into the boiler of the power plant for affinity calcination

Keywords： value-added products     quick burning and quick cooling     solid desulfurization     affinity granules     affinity calcination    

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Low-temperature CO oxidation over Au-doped 13X-type zeolite catalysts: preparation and catalytic activity

Qing YE, Donghui LI, Jun ZHAO, Jiansheng ZHAO, Tianfang KANG, Shuiyuan CHENG

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 4,   Pages 497-504 doi: 10.1007/s11783-011-0256-z

Abstract: concentration of 1.5 × 10 mol·L gold solution pH of 6, solution temperature of around 90°C, and a calcination

Keywords： 13X-type zeolite     CO oxidation     gold solution     pH     calcination temperature    

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Title Author Date Type Operation

Small-sized Ni-Co/MoC/CoMoC@C for efficient alkaline and acidic hydrogen evolution reaction by an anchoring calcination

Journal Article

Enhancing the adsorption function of biochar by mechanochemical graphitization for organic pollutant removal

Journal Article

WO3 nanomaterials synthesized via a sol-gel method and calcination for use as a CO gas sensor

Diah SUSANTI,A.A. Gede Pradnyana DIPUTRA,Lucky TANANTA,Hariyati PURWANINGSIH,George Endri KUSUMA,Chenhao WANG,Shaoju SHIH,Yingsheng HUANG

Journal Article

Pd-Fe/α-Al

Shengping WANG, Xin ZHANG, Yujun ZHAO, Yadong GE, Jing LV, Baowei WANG, Xinbin MA

Journal Article

A study on the catalytic performance of Pd/γ-Al

Ruizhi CHU, Xianyong WEI, Zhimin ZONG, Wenjia ZHAO

Journal Article

Preparation of ultrafine α-AlO using precipitation-azeotropic distillation method

XIAO Jin, QIN Qi, ZHOU Feng, CHEN Yanbin, WAN Ye

Journal Article

Comparison of the morphology and structure of WO

Diah Susanti, Stefanus Haryo N, Hasnan Nisfu, Eko Prasetio Nugroho, Hariyati Purwaningsih, George Endri Kusuma, Shao-Ju Shih

Journal Article

Clean Burning Process of Coal Which Converts Pollutants into Value-added Products

Zhu Xuefang

Journal Article

Low-temperature CO oxidation over Au-doped 13X-type zeolite catalysts: preparation and catalytic activity

Qing YE, Donghui LI, Jun ZHAO, Jiansheng ZHAO, Tianfang KANG, Shuiyuan CHENG

Journal Article