MXene (Ti₃C₂T_x), which is known for its exceptional hydrophilicity, remarkable electrical/thermal conductivity, and superior mechanical strength, has emerged as an ideal candidate for developing stimuli-responsive actuators. However, current MXene-based actuators are unable to simultaneously achieve both multiple stimuli responses and programmable deformation, which restricts their practical applications in real-world scenarios. Here, we have developed a multi-responsive MXene/paraffin wax (PW)&Fe₃O₄ actuator with shape programmability by introducing micro-ridge structures. Since the different hydrophilicity and thermal expansion characteristics between the two layers, the actuator exhibits stimuli-responsive deformations under humidity, light, and magnetic field. Additionally, by controlling the orientation of the micro-ridge structures, combined with heat-welding methods, various complex three-dimensional configurations of actuators can be programmed. As proof of concept, several smart devices, such as a biomimetic Trachelospermum jasminoides, a spiral gripper, and a maze robot, are demonstrated, offering new insights for the development of future flexible smart devices.

Wearable health monitoring systems require seamless integration of sensing and memory functionalities for real-time physiological signal acquisition and processing. However, conventional approaches relying on hybrid integration of rigid silicon-based memory with flexible sensors suffer from mechanical mismatch and complex interfacing, limiting their practicality in continuous physiological monitoring. Here, we present a sensing-storage monolithically integrated system fabricated through low-cost solution spin-coating, which combines a flexible floating-gate organic thin-film transistor (FG-OTFT) memory with an OTFT pressure sensor. The pressure sensor exhibits a wide operating range of 0–40 kPa, a fast response time of 34 ms, and stable performance after 5000 bending cycles and over temperatures from −20 to 60 °C. When conformally attached to the finger joint, wrist, and human throat, the device delivers distinct current variations that faithfully track joint bending angles and intermittent coughing. The integrated floating-gate memory exhibits a large memory window of 18 V under ±80 V program/erase biases, a retention time exceeding 10⁵ s, and robust operation after 3000 bending cycles. A 1 × 9 memory array is used to store 7-bit ASCII-encoded characters with two additional check bits, and the stored information is wirelessly transmitted via Bluetooth low energy to a mobile application. Comparative analysis shows that the integrated system offers a shorter response time and longer data retention than previously reported OTFT-based pressure sensors and organic memories used for physiological monitoring. These results highlight a low-cost, fully flexible, and application-oriented platform for wearable electronic skins capable of simultaneous physiological sensing, data storage, and intuitive visual readout.

Electrocatalytic hydrogen evolution reaction (HER) faces challenges in alkaline due to competitive adsorption of *OH and *H at the same active site, which hinders H₂ generation. Single-atom alloys (SAAs), particularly Ni-based systems like NiPt₁ SAAs, show considerable performance through dual-site mechanisms, where Ni adsorbs *OH while Pt facilitates H₂ desorption. However, *OH blockage on Ni hinders *OH desorption and triggers slow water dissociation kinetics. Herein, supported NiPt₁ alloy nanoclusters embedded with Ni₃ZnC_0.7 (Ni₃ZnC_0.7@NiPt₁) are synthesized through pyrolysis of zeolitic imidazolate framework-8 (ZIF-8)@Ni coordination compound (ZIF-8@NCC) coupled with Pt galvanic replacement reactions. Experiments and calculations reveal that the embedded Ni₃ZnC_0.7 modulates electronic structure of Ni, promoting *OH desorption and enhancing water dissociation. Thus, supported Ni₃ZnC_0.7@NiPt₁ achieves exceptional low overpotential (η₁₀ = 23 mV) and high mass activity (MA₅₀ = 1.67 mA·μg_Pt⁻¹) in alkaline, which remarkably surpass Ni@NiPt₁ (η₁₀ = 127 mV and MA₅₀ = 0.101 mA·μg_Pt⁻¹). The corresponding alkaline anion-exchange membrane water electrolyzer (AEMWE) requires only 1.91 V at 1 A·cm⁻², demonstrating industrial viability. This work provides new insights into addressing *OH blockage on SAAs catalysts in alkaline HER.

Microfluid chips integrating with organic electrochemical transistors (OECTs) are useful for manufacturing biosensors with high throughput and large-scale analyses. We report here the utilization of alternating current (AC) electrodeposition to fabricate OECTs in situ on a microfluid chip. With this method, the organic semiconductor (OS) layer with a channel length of 8 μm was readily prepared without requiring the post-bonding process in the conventional construction of microfluidic chips. Poly(3, 4-ethylenedioxythiophene): poly(4-styrenesulfonate)/graphene quantum dots (PEDOT: PSS/GQDs) composites with different morphologies, such as microfilms, nanodendrites and nanowires were electropolymerized. The mass transfer process of the electropolymerization reaction was evidenced to be diffusion limited. Morphologies, growth directions, and chemical structures of OS layers could be tuned by the amplitude and the frequency of the AC voltage. Transfer and output characteristic curves of OECTs were measured on the microfluidic chip. The maximum transconductance, on/off current ratio and threshold voltage measured in the experiment was 1.58 mS, 246, and 0.120 V, respectively.