3D hierarchical heterostructure NiFe LDH@NiCoP/NF electrodes are prepared successfully on nickel foam with special interface engineering and synergistic effects. This research finds that the as-prepared NiFe LDH@NiCoP/NF electrodes have a more sophisticated inner structure and intensive interface than a simple physical mixture. The NiFe LDH@NiCoP/NF electrodes require an overpotential as low as 120 and 220 mV to deliver 10 mA cm −2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1 m KOH, respectively. Tafel and electrochemical impedance spectroscopy further reveal a favorable kinetic during electrolysis. Specifically, the NiFe LDH@NiCoP/NF electrodes are simultaneously used as cathode and anode for overall water splitting, which requires a cell voltage of 1.57 V at 10 mA cm −2 . Furthermore, the synergistic effect of the heterostructure improves the structural stability and promotes the generation of active phases during HER and OER, resulting in excellent stability over 100 h of continuous operation. Moreover, the strategy and interface engineering of the introduced heterostructure can also be used to prepare other bifunctional and cost-efficient electrocatalysts for various applications.

The study of algorithms to automatically answer visual questions currently is motivated by visual question answering (VQA) datasets constructed in artificial VQA settings. We propose VizWiz, the first goal-oriented VQA dataset arising from a natural VQA setting. VizWiz consists of over 31,000 visual questions originating from blind people who each took a picture using a mobile phone and recorded a spoken question about it, together with 10 crowdsourced answers per visual question. VizWiz differs from the many existing VQA datasets because (1) images are captured by blind photographers and so are often poor quality, (2) questions are spoken and so are more conversational, and (3) often visual questions cannot be answered. Evaluation of modern algorithms for answering visual questions and deciding if a visual question is answerable reveals that VizWiz is a challenging dataset. We introduce this dataset to encourage a larger community to develop more generalized algorithms that can assist blind people.

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Advanced reversible aqueous and flexible ZABs were achieved with 3D dual-linked hexaiminobenzene MOFs.

Gold nanoparticles (Au NPs) were prepared by reducing HAuCl 4 with NaBH 4 . Their average particle sizes could be tuned in the range of 1.7 and 8.2 nm, by adjusting the amount of NaBH 4 used during synthesis. The obtained Au NPs (colloids) were then loaded onto a commercial Al 2 O 3 support to prepare Au/Al 2 O 3 catalysts with tunable Au particle sizes. An optimal pH value (5.9) of the Au colloid solution was found to be essential for loading Au NPs onto Al 2 O 3 while avoiding the growth of Au NPs. Au NPs and Au/Al 2 O 3 catalysts were tested in the reduction of p-nitrophenol with NaBH 4 . Interestingly, the catalytic activity depended on the size of Au NPs, being the highest when the average size was 3.4 nm. Relevant characterization by UV-Vis, TEM, and XRD was conducted.

Pt single atoms have unique power in enhancing and accelerating OER active NiOOH phase transformation from NiO.

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Metal Atom Array In article number 2212827, Wei Luo, Xiaopeng Li, and co‐workers present an emerging heterogeneous catalyst named metal array catalyst (MAC). The MACs possess tunable interatomic distance and electronic properties, strong synergy between atoms, and the predictive nature of the atomic arrangement, which serves as a versatile platform for rationally designing active sites with atomic‐level precision.