Water Splitting: Synergism of Geometric Construction and Electronic Regulation: 3D Se‐(NiCo)Sx/(OH)x Nanosheets for Highly Efficient Overall Water Splitting (Adv. Mater. 12/2018)

Hu, Congling; Zhang, Lei; Zhao, Zijian; Li, Ang; Chang, Xiaoxia; Gong, Jinlong

doi:10.1002/adma.201870085

Cited by 68 publications

(36 citation statements)

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“…The regulated electronic structure of active sites by room temperature sulfurization can optimize the adsorption energy of oxygen‐containing reactant and intermediates . Moreover, the binding energy centered at 785.5 eV corresponds to the characteristic peak of the CoS bonding, which further verifies the interaction between Co ions and S 2− . The fine‐scanned S 2p spectrum is shown in Figure 2d.…”

Section: Resultsmentioning

confidence: 90%

Boosting H₂ Generation Coupled with Selective Oxidation of Methanol into Value‐Added Chemical over Cobalt Hydroxide@Hydroxysulfide Nanosheets Electrocatalysts

Xiang

Deng

et al. 2020

Adv Funct Materials

208

145

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The sluggish kinetics of oxygen evolution reaction (OER) is the main bottleneck for the electrocatalytic water splitting to produce hydrogen (H2), and the by‐product is worthless O2. Therefore, designing a thermodynamically favorable oxidation reaction to replace OER and coupling with value‐added product generation on the anode is of significance for boosting H2 generation under low electrolysis voltage. Herein, cobalt hydroxide@hydroxysulfide nanosheets on carbon paper (Co(OH)2@HOS/CP) are synthesized as bifunctional electrocatalysts to facilitate H2 production and convert methanol to valuable formate simultaneously. Benefiting from the influences/changes on the composition, surface properties, electronic structure, and chemistry of Co(OH)2, the as‐obtained electrodes exhibit very high selectivity for methanol to value‐added formate oxidation (MFO) and boost electrocatalytic performance with low overpotential of 155 mV for MFO and 148 mV for hydrogen evolution reaction at a current density of 10 mA cm−2. Furthermore, the integrated two‐electrode electrolyzer drives 10 mA cm−2 at a cell voltage of 1.497 V with united 100% Faradaic efficiency for anodic and cathodic reaction and continuous 20 h of operation without obvious decay. The electrocatalytic hydrogen production with the assistance of alternative oxidation by the robust electrocatalyst can be further used to realize the upgrading of other organic molecules with less energy consumption.

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Section: Resultsmentioning

confidence: 90%

Boosting H₂ Generation Coupled with Selective Oxidation of Methanol into Value‐Added Chemical over Cobalt Hydroxide@Hydroxysulfide Nanosheets Electrocatalysts

Xiang

Deng

et al. 2020

Adv Funct Materials

208

145

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“…[ 1,5,6 ] Recently, transition‐metal‐based electrocatalysts were also reported to achieve high OER performance. [ 7–13 ] Especially, Ni‐rich or Co‐rich materials have been used as the state‐of‐the‐art OER electrocatalysts. [ 7–10 ] It is interesting that the second most earth‐abundant metal Fe (much cheaper than Ni or Co) based electrocatalysts typically show relatively low OER activities.…”

Section: Introductionmentioning

confidence: 99%

“…[ 7–13 ] Especially, Ni‐rich or Co‐rich materials have been used as the state‐of‐the‐art OER electrocatalysts. [ 7–10 ] It is interesting that the second most earth‐abundant metal Fe (much cheaper than Ni or Co) based electrocatalysts typically show relatively low OER activities. [ 12,13 ] Despite extensive researches over the past years, most OER catalysts still need high overpotentials of 250–400 mV to reach the current density of interest (around 10 mA cm −2 ).…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Oxygen Evolution by a Thermocatalytic Process Cascaded Electrocatalysis Over Sulfur‐Treated Fe‐Based Metal–Organic‐Frameworks

Feng

Zhang

Liu

et al. 2020

Advanced Energy Materials

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The oxygen evolution reaction (OER) is a bottleneck process for water splitting and finding highly efficient, durable, low‐cost, and earth‐abundant electrocatalysts is still a major challenge. Here a sulfur‐treated Fe‐based metal–organic‐framework is reported as a promising electrocatalyst for the OER, which shows a low overpotential of 218 mV at the current density of 10 mA cm−2 and exhibits a very low Tafel slope of 36.2 mV dec−1 at room temperature. It can work on high current densities of 500 and 1000 mA cm−2 at low overpotentials of 298 and 330 mV, respectively, by keeping 97% of its initial activity after 100 h. Notably, it can achieve 1000 mA cm−2 at 296 mV with a good stability at 50 °C, fully fitting the requirements for large‐scale industrial water electrolysis. The high catalytic performance can be attributed to the thermocatalytic processes of H+ capture by –SO3 groups from *OH or *OOH species, which cascades to the electrocatalytic pathway and then significantly reduces the OER overpotentials.

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“…[ 22 ] From the perspective of biomedical application, a trigger temperature slightly lower than body temperature is desired, since this will require no extrinsic heating source. [ 33,34 ] We can see that the PAN‐PACG‐4 with R AN = 75 wt% showed an optimal T trans of 32.2 °C. Due to the absence of carboxyl, there was a slight difference between PAN‐PACG‐4 with R AN = 100 wt% and PAN‐PACG‐7.4 in temperature sweep results (Figure S3c, Supporting Information), which further confirmed the necessity of reversible hydrogen bonds for the formation of temperature‐responsive hydrogels.…”

Section: Resultsmentioning

confidence: 94%

Stiffness Self‐Tuned Shape Memory Hydrogels for Embolization of Aneurysms

Liu

Gao

et al. 2020

Adv Funct Materials

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An aneurysm is a life-threatening vascular disease. Embolization with shape memory (SM) hydrogel coils is promising for the treatment of the intractable aneurysms. However, single temperature-triggered SM is softened in a catheter, and delivery of multiple coils is required, which may clog the catheter and complicate operation procedure. Here, a radiopaque temperature/pH dual responsive shape memory hydrogel with self-tuned stiffness is fabricated by copolymerizing acrylonitrile (AN, dipole-dipole interaction monomer), N-acryloyl 2-glycine (ACG, pH-sensitive H-bonding monomer), and polyethylene glycol diacrylate. Under slightly acidic conditions without eliciting cytotoxicity, additional supramolecular PACG hydrogen bonds combined with cyano dipole-dipole pairings contribute to the body temperature-triggered SM effect with an unprecedented high 430 MPa (10 °C) and 16 MPa (37 °C) Young's modulus. A carotid aneurysm is created in a dog to test the embolization of this SM hydrogel. At 37 °C, the hydrogel's high stiffness ensures its smooth delivery through a catheter. After being transported into the aneurysm sac, secondary swelling occurs concurrent with appropriate decrease of stiffness upon contacting neutral blood, thus enhancing the packing density and reducing recanalization rate and delivery times. This stiffness adaptive SM hydrogel holds its great potential as permanent embolic agents for treating a variety of aneurysms.

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Water Splitting: Synergism of Geometric Construction and Electronic Regulation: 3D Se‐(NiCo)S_x/(OH)_x Nanosheets for Highly Efficient Overall Water Splitting (Adv. Mater. 12/2018)

Cited by 68 publications

References 0 publications

Boosting H₂ Generation Coupled with Selective Oxidation of Methanol into Value‐Added Chemical over Cobalt Hydroxide@Hydroxysulfide Nanosheets Electrocatalysts

Boosting H₂ Generation Coupled with Selective Oxidation of Methanol into Value‐Added Chemical over Cobalt Hydroxide@Hydroxysulfide Nanosheets Electrocatalysts

Highly Efficient Oxygen Evolution by a Thermocatalytic Process Cascaded Electrocatalysis Over Sulfur‐Treated Fe‐Based Metal–Organic‐Frameworks

Stiffness Self‐Tuned Shape Memory Hydrogels for Embolization of Aneurysms

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Water Splitting: Synergism of Geometric Construction and Electronic Regulation: 3D Se‐(NiCo)Sx/(OH)x Nanosheets for Highly Efficient Overall Water Splitting (Adv. Mater. 12/2018)

Cited by 68 publications

References 0 publications

Boosting H2 Generation Coupled with Selective Oxidation of Methanol into Value‐Added Chemical over Cobalt Hydroxide@Hydroxysulfide Nanosheets Electrocatalysts

Boosting H2 Generation Coupled with Selective Oxidation of Methanol into Value‐Added Chemical over Cobalt Hydroxide@Hydroxysulfide Nanosheets Electrocatalysts

Highly Efficient Oxygen Evolution by a Thermocatalytic Process Cascaded Electrocatalysis Over Sulfur‐Treated Fe‐Based Metal–Organic‐Frameworks

Stiffness Self‐Tuned Shape Memory Hydrogels for Embolization of Aneurysms

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Product

Resources

About

Water Splitting: Synergism of Geometric Construction and Electronic Regulation: 3D Se‐(NiCo)S_x/(OH)_x Nanosheets for Highly Efficient Overall Water Splitting (Adv. Mater. 12/2018)

Boosting H₂ Generation Coupled with Selective Oxidation of Methanol into Value‐Added Chemical over Cobalt Hydroxide@Hydroxysulfide Nanosheets Electrocatalysts

Boosting H₂ Generation Coupled with Selective Oxidation of Methanol into Value‐Added Chemical over Cobalt Hydroxide@Hydroxysulfide Nanosheets Electrocatalysts