which is also considered a biorenew able energy carrier. However, the anodic ethanol oxidation reaction (EOR) is a complicated and kinetically sluggish process, involving the transfer of multiple electrons and various reaction intermediates and products. Typically, the C2-pathway dominates the EOR in both acidic and alkaline electrolytes, resulting in the formation of acetic acid or acetate by delivering four electrons, and acetaldehyde by delivering two electrons, respectively. The C1-pathway, which involves complete oxidation and the transfer of 12 electrons generating CO 2 or carbonate, is preferred to the C2-pathway, aiming for maximum DEFCs efficiency. [1][2][3][4][5] Specially, highly efficient catalysts have been developed by engineering Pt-based nanocrystals, and the C1-pathway selectivity has been promoted by Rh-based catalysts. [6][7][8][9] In designing electrochemical surfaces toward maximum performance, modifying the electronic structure and strain of catalytic surfaces are considered state-of-the-art strategies, which can for instance be achieved by introducing metals with different intrinsic reactivities and constructing core-shell nanostructures, respectively. [10][11][12][13][14][15] Combining these approaches in a rational manner would be a promising way to substantially improve the EOR, yet the underlying knowledge about their contributions is largely lacking. [10][11][12][13][14][15][16][17][18] Therefore, it is highly desirable to employ tailored nanostructures to resolve these important issues and contribute to the practical deployment of DEFCs by identifying versatile EOR electrocatalysts possessing high atom utilization of noble metals, high mass-normalized activity at low overpotentials, high C1-pathway selectivity, long-term durability, and superior anti-poisoning ability. [1] To maximize atom utilization, single-atom catalysts (SACs) have emerged as one of the most promising frontiers in materials chemistry. [19][20][21] Using specific support materials such as reducible metal oxides, activated carbons, and anisotropic materials such as MoS 2 , single atoms of catalytically metals can be stabilized, which exhibit intriguing physicochemical properties compared with their counterpart clusters and nanoparticles. [22][23][24] Typically, high-performance EOR catalysts should facilitate multiple dehydrogenation and oxidation steps as well as CC bond cleavage reactions. All these reactions typically require ensembles of surface metal atoms, implying that thisThe rational design and control of electrocatalysts at single-atomic sites could enable unprecedented atomic utilization and catalytic properties, yet it remains challenging in multimetallic alloys. Herein, the first example of isolated Rh atoms on ordered PtBi nanoplates (PtBi-Rh 1 ) by atomic galvanic replacement, and their subsequent transformation into a tensile-strained Pt-Rh single-atom alloy (PtBi@PtRh 1 ) via electrochemical dealloying are presented. Benefiting from the Rh 1 -tailored Pt (110) surface with tensile strain, the PtBi@...

The elastic storage and release of mechanical energy has been key to many developments throughout the history of mankind. Resilience, absent hysteresis, has been an elusive goal to achieve, particularly at large deformations. Using a low‐crosslink‐density polyacrylamide hydrogel at 96% water content having hyperbranched silica nanoparticles (HBSPs) as the major junction points, a hysteresis‐free material is realized. The fatigue‐free characteristic of these composite hydrogels is evidenced by the invariance of the stress–strain curves at strain ratios of 4, even after 5000 cycles. At a strain ratio of 7, only a 1.3% hysteresis is observed. A markedly increased strain‐ratio‐at‐break of 11.5 is observed. The unique attributes of these resilient hydrogels are manifested in the high‐fidelity detection of dynamic deformations under cyclic loading over a broad range of frequencies, difficult to achieve with other materials.

Small size molybdenum carbides (2.5 nm for MoC and 5.0 nm for Mo2C) with clean surface on graphene were prepared for efficient and stable hydrogen evolution reaction catalysts.